Patent Application
20250158732
This application is based upon and claims the benefit of priority from Japanese patent application No. 2023-191692, filed on Nov. 9, 2023, the disclosure of which is incorporated herein in its entirety by reference.
The present disclosure relates to an optical transmission control apparatus, an optical transmission system, a method for an optical transmission control apparatus, and a program. In particular, the present disclosure relates to an optical transmission control apparatus, an optical transmission system, a method for an optical transmission control apparatus, and a program capable of changing the transmission capacities of optical transmission lines based on the amounts of data to be transmitted therethrough.
In general, a core network or a metro network for optical communication (optical transmission) is operated by using an uplink fiber and a downlink fiber as a pair, in which the communication capacity (transmission capacity) of each fiber is fixed.
In such a case, there is a problem that when, as a result of an increase in an amount of traffic (data), an imbalance occurs between the amount of data to be transmitted through the uplink and that to be transmitted through the downlink, and the amount of data, for example, in the downlink becomes so large that it reaches the transmitting capacity thereof, a new fiber pair has to be laid (e.g., installed), even when the total transmitting capacity of the uplink and downlink is large enough to enable the total amount of the data to be transmitted.
Patent Literature 1 (Japanese Unexamined Patent Application Publication No. H11-218729) discloses that “comprising: an optical device including one input/output terminal pair including a pair of input/output terminals and another input/output terminal pair including a pair of input/output terminals, and having a bidirectional variable filter function configured so that when a plurality of optical signals having different wavelengths are input from one input/output terminal included in either one of the input/output terminal pairs, some of the optical signals are output from one input/output terminal included in the input/output terminal pair to which the optical signals are not input, and the remaining optical signals are output from the other input/output terminal included in the input/output terminal pair to which the optical signals are not input; and a first optical signal path switching unit connected to the optical device, and configured to switch an optical signal input/output path between the optical device and bidirectional optical signal transmission means by using an optical circulator”.
Patent Literature 1 discloses neither that when an imbalance occurs between the amount of data to be transmitted through the uplink and that in the downlink, the transmission capacities of the uplink and downlink optical transmission paths are flexibly changed by switching the optical transmission direction, nor that the transmission capacities of the optical transmission lines are changed based on the amounts of data to be transmitted therethrough. As described above, there is a problem that when an imbalance occurs between the amounts of data to be transmitted, a new optical fiber pair has to be laid (e.g., installed).
In order to solve the problem described above, an object of the present disclosure is to provide an optical transmission control apparatus, an optical transmission system, a method for an optical transmission control apparatus, and a program capable of changing the transmission capacities of optical transmission lines based on the amounts of data to be transmitted therethrough.
An optical transmission control apparatus according to the present disclosure includes:
An optical transmission system according to the present disclosure includes: a first optical transmission apparatus, a second optical transmission apparatus, a plurality of optical transmission paths connected between the first and second optical transmission apparatuses, and an optical transmission control apparatus configured to control the first and second optical transmission apparatuses, in which
A method for an optical transmission control apparatus according to the present disclosure includes:
A program according to the present disclosure causes a computer to perform:
The above and other aspects, features and advantages of the present disclosure will become more apparent from the following description of certain exemplary example embodiments when taken in conjunction with the accompanying drawings, in which:
An example embodiment according to the present disclosure will be described hereinafter with reference to the drawings. The same or corresponding elements are assigned the same reference numerals (or symbols) throughout the drawings, and redundant explanations thereof will be omitted as required for clarifying explanations thereof.
An example of a configuration of an optical transmission control apparatus will be described hereinafter with reference to
As shown in
The selecting unit 131 selects a saturated optical transmission path 14s of which the optical transmission usage ratio exceeds a first threshold from among a plurality of optical transmission paths 14 connected between the first and second optical transmission apparatuses 11 and 12. The plurality of optical transmission paths 14 are formed by first to nth optical transmission paths 141 to 14n. The nth optical transmission path 14n is formed by an nth downlink optical transmission path 14nd and an nth uplink optical transmission path 14nu. Note that n is an integer equal to or greater than one. Further, the saturated optical transmission path 14s is, for example, a first downlink optical transmission path 141d. Note that the optical transmission usage ratio may also be referred to as a filling ratio. Further, the filling ratio is the ratio of the currently-used wavelength band to the maximum wavelength band in which optical signals can be transmitted through the optical transmission path.
The specifying unit 132 specifies an evacuation optical transmission path 14e of which the optical transmission direction is opposite to that of the saturated optical transmission path 14s and of which the optical transmission usage ratio is lower than a second threshold from among the plurality of optical transmission paths 14. The reason why the evacuation optical transmission path 14e is specified from among optical transmission lines of which the optical transmission directions are opposite to that of the saturated optical transmission path 14s is that the purpose of the evacuation is, when there is an imbalance between the amount of data to be transmitted in the uplink and that in the downlink, to change the transmission capacities of the uplink and downlink by switching the transmission direction of at least one of the optical transmission paths. Further, in this case, it is possible to increase the amount of data evacuated (i.e., transferred) to the evacuation optical transmission path 14e by specifying, as the evacuation optical transmission path 14e, an optical transmission path of which the optical transmission usage ratio is lower than the second threshold, i.e., of which the usage ratio is low. Here, it is assumed that, for example, the nth uplink optical transmission path 14nu is specified as the evacuation optical transmission path 14e. Note that the second threshold is lower than the first threshold.
The control unit 133 transmits, to the first and second optical transmission apparatuses 11 and 12, a transfer control signal for transferring data to be transmitted through a counterpart optical transmission path 14p, which is an optical transmission path which is paired with the saturated optical transmission path 14s and of which the optical transmission direction is opposite to that of the saturated optical transmission path 14s, to the evacuation optical transmission path 14e. Since the saturated optical transmission path 14s is the first downlink optical transmission path 141d, the counterpart optical transmission path 14p, which is paired with the saturated optical transmission path 14s, is the first uplink optical transmission path 141u. As the control unit 133 transmits the transfer control signal to the first and second optical transmission apparatuses 11 and 12, the first and second optical transmission apparatuses 11 and 12 operate so as to transfer data to be transmitted through the first uplink optical transmission path 141u (counterpart optical transmission path 14p) to the nth uplink optical transmission path 14nu (evacuation optical transmission path 14e).
The path-direction switching unit 134 transmits, to the first and second optical transmission apparatuses 11 and 12, a switching control signal for switching the optical transmission direction of the counterpart optical transmission path 14p to the opposite direction after the transfer of the data to be transmitted through the counterpart optical transmission path 14p to the evacuation optical transmission path 14e is completed. As the path-direction switching unit 134 transmits the switching control signal to the first and second optical transmission apparatuses 11 and 12, the first and second optical transmission apparatuses 11 and 12 operate so as to switch the optical transmission direction of the counterpart optical transmission path 14p to the opposite direction.
The control unit 133 transmits, to the first and second optical transmission apparatuses 11 and 12, a sorting-out control signal for sorting out part of the data to be transmitted through the saturated optical transmission path 14s to the counterpart optical transmission path 14p after the optical transmission direction of the counterpart optical transmission path 14p is switched to the opposite direction.
In this way, even when an imbalance occurs between the amounts of data to be transmitted, it is possible to switch the optical transmission direction, and thereby to flexibly change the transmission capacities of the uplink and downlink, thus making it possible to transmit data without laying (e.g., installing) a new optical transmission path. As a result, it is possible to provide an optical transmission control apparatus, a method for an optical transmission control apparatus, and a program capable of changing the transmission capacities of optical transmission lines based on the amounts of data to be transmitted therethrough.
Further, according to the first example embodiment, since a counterpart optical transmission path, which is paired with a saturated optical transmission path, is used, the saturated optical transmission path and the counterpart optical transmission path are the same path. As a result, since the saturated optical transmission path and the counterpart optical transmission path extend (i.e., are routed) through the same environment and have the same transmission distance, their delay characteristics and the like are equivalent to each other, so that signals transmitted through these optical transmission paths can be easily received on the receiving side (e.g., there is no need to separately make delay compensation or the like in the saturated optical transmission path and the counterpart optical transmission path).
An example of a configuration of an optical transmission system will be described hereinafter with reference to
In
There are actually a plurality of optical switching units (SWs) for respective fiber pairs in each optical transmission apparatus as described in
As shown in
The plurality of optical transmission paths 14 include at least a first optical transmission path 141 and a second optical transmission path 142. In the first optical transmission path 141, a first downlink optical transmission path 141d, through which signals are transmitted from the first optical transmission apparatus 11 toward the second optical transmission apparatus 12, is paired with a first uplink optical transmission path 141u, through which signals are transmitted from the second optical transmission apparatus 12 toward the first optical transmission apparatus 11. In the second optical transmission path 142, a second downlink optical transmission path 142d, through which signals are transmitted from the first optical transmission apparatus 11 toward the second optical transmission apparatus 12, is paired with a second uplink optical transmission path 142u, through which signals are transmitted from the second optical transmission apparatus 12 toward the first optical transmission apparatus 11.
The first optical transmission apparatus 11 includes a first optical switching unit 111, a first downlink wavelength selecting switching unit 112d, a first uplink wavelength selecting switching unit 112u, a first optical control unit 113, and a first optical transmission/reception switching unit 114. The first optical switching unit 111 is represented by SW, which is an abbreviation of an optical switch (Switch). The wavelength selecting switching unit is represented by WSS, which is an abbreviation of a wavelength selective switch (Wavelength Selective Switch).
The first optical control unit 113 controls the first optical switching unit 111 and the first downlink wavelength selecting switching unit 112d or the first uplink wavelength selecting switching unit 112u based on a transfer control signal in order to transfer data to be transmitted through a counterpart optical transmission path 14p so that the data is transmitted through an evacuation optical transmission path 14e.
The first optical transmission/reception switching unit 114 controls the first optical switching unit 111 and the first downlink wavelength selecting switching unit 112d or the first uplink wavelength selecting switching unit 112u in order to switch the optical transmission direction of the counterpart optical transmission path 14p to the opposite direction based on a switching control signal after the transfer of the data to be transmitted through the counterpart optical transmission path 14p is completed.
The first optical control unit 113 sorts out part of the data to be transmitted through the saturated optical transmission path 14s to the counterpart optical transmission path 14p based on a sorting-out control signal after the optical transmission direction of the counterpart optical transmission path 14p is switched to the opposite direction. The transfer control signal, the switching control signal, and the sorting-out control signal are collectively referred to as control signals.
The second optical transmission apparatus 12 includes a second optical switching unit 121, a second downlink wavelength selecting switching unit 122d, a second uplink wavelength selecting switching unit 122u, a second optical control unit 123, and a second optical transmission/reception switching unit 124.
The second optical control unit 123 controls the second optical switching unit 121 and the second downlink wavelength selecting switching unit 122d or the second uplink wavelength selecting switching unit 122u based on the transfer control signal in order to transfer data to be transmitted through the counterpart optical transmission path 14p so that the data is transmitted through the evacuation optical transmission path 14e.
The second optical transmission/reception switching unit 124 controls the second optical switching unit 121 and the second downlink wavelength selecting switching unit 122d or the second uplink wavelength selecting switching unit 122u in order to switch the optical transmission direction of the counterpart optical transmission path 14p to the opposite direction based on the switching control signal after the transfer of the data to be transmitted through the counterpart optical transmission path 14p is completed. Each of the second downlink and uplink wavelength selecting switching units 122d and 122u may be a wavelength selective switch (WSS: Wavelength Selective Switch).
The second optical control unit 123 sorts out part of the data to be transmitted through the saturated optical transmission path 14s to the counterpart optical transmission path 14p based on the sorting-out control signal after the optical transmission direction of the counterpart optical transmission path 14p is switched to the opposite direction.
Note that an optical transmission apparatus may also be referred to as a node or a Node. Further, the optical transmission control apparatus 13 has already been described above and hence the description thereof will be omitted here.
Further, the first optical transmission apparatus 11 may further include a wavelength conversion unit (not shown). When the evacuation optical wavelength of the optical carrier wave for conveying data to be transmitted through the evacuation optical transmission path 14e and the counterpart optical wavelength of the optical carrier wave for conveying data to be transmitted through the counterpart optical transmission path 14p are the same as each other, they may interfere with each other. Therefore, the wavelength conversion unit converts the counterpart optical wavelength into a wavelength different from the evacuation optical wavelength in order to avoid such interference.
An example of operations performed by the optical transmission control apparatus will be described hereinafter with reference to
As shown in
The optical transmission control apparatus 13 summarizes optical transmission usage ratios of optical transmission paths for each path direction (e.g., for each of the downlink and the uplink) (Step S102).
The optical transmission control apparatus 13 checks whether the optical transmission usage ratio for either of the path directions (e.g., either of the downlink and the uplink) exceeds a first threshold (Step S103). That is, the optical transmission control apparatus 13 selects an optical transmission path (saturated optical transmission path 14s) of which the optical transmission usage ratio exceeds the first threshold from among a plurality of optical transmission paths 14.
When Step S103: Yes, the optical transmission control apparatus 13 checks whether the optical transmission usage ratio of the path direction that does not satisfy the condition in the step S103 is lower than a second threshold (Step S104). Specifically, the optical transmission control apparatus 13 specifies an optical transmission path (evacuation optical transmission path 14e) of which the optical transmission direction is opposite to that of the saturated optical transmission path 14s and of which the optical transmission usage ratio is lower than the second threshold from among the plurality of optical transmission paths 14. When Step S103: No, the optical transmission control apparatus 13 returns to the step S101.
When Step S104: Yes, the optical transmission control apparatus 13 summarizes (e.g., adds up) amounts of data to be transmitted in the path direction (evacuation optical transmission path 14e) of which the optical transmission usage ratio is lower than the second threshold (Step S105). Specifically, the optical transmission control apparatus 13 controls the first and second optical transmission apparatuses 11 and 12 so as to transfer data to be transmitted through the counterpart optical transmission path 14p, which is paired with the saturated optical transmission path 14s and of which the optical transmission direction is opposite to that of the saturated optical transmission path, to the evacuation optical transmission path 14e. When Step S104 is No, the optical transmission control apparatus 13 returns to the step S101. Data to be transmitted may also be referred to as traffic.
In the step S105, if the optical wavelengths overlap in the evacuation optical transmission path 14e when data (traffic) to be transmitted in the path direction of which the optical transmission usage ratio is lower than the second threshold is summarized (e.g., added up), the optical wavelength to be transferred is temporarily dropped, and then is converted and added again. As a result, the optical wavelength that is already present in the evacuation optical transmission path 14e and the optical wavelength to be transferred are no longer the same as each other, thus making it possible to avoid the interference therebetween.
The optical transmission control apparatus 13 confirms that there is no longer data to be transmitted (Step S106). Specifically, the optical transmission control apparatus 13 confirms that the transfer of data to be transmitted through the counterpart optical transmission path 14p has been completed, and that there is no longer data to be transmitted through the counterpart optical transmission path 14p.
The optical transmission control apparatus 13 switches the transmission direction of the optical transmission path (counterpart optical transmission path 14p) in which there is no longer data to be transmitted (Step S107). Specifically, the optical transmission control apparatus 13 switches the optical transmission direction of the counterpart optical transmission path 14p in which there is no longer data to be transmitted to the opposite direction.
The optical transmission control apparatus 13 fills (i.e., supplies) the optical transmission pass in the path direction that satisfies the first threshold (i.e., the saturated optical transmission path 14s) with data (Step S108). Specifically, the optical transmission control apparatus 13 controls the first and second optical transmission apparatuses 11 and 12 so as to sort out part of the data to be transmitted through the saturated optical transmission path 14s to the counterpart optical transmission path 14p. As a result, the counterpart optical transmission path 14p is filled (i.e., supplied) with data to be transmitted through the saturated optical transmission path 14s.
The optical transmission usage ratio of data transmitted through the saturated optical transmission path 14s is reduced, so that the data to be transmitted can be transmitted, thus eliminating the need to lay (i.e., install) a new optical transmission path. As a result, it is possible to provide an optical transmission control apparatus, a method for an optical transmission control apparatus, and a program capable of changing the transmission capacities of optical transmission lines based on the amounts of data to be transmitted therethrough.
As shown in
The optical circulator is a directional optical device and can be used in place of an optical switch. That is, each of the first and second optical switching units 111 and 121 may be an optical switch or an optical circulator.
As shown in
The Pump LD is used as exciting light when the optical amplifier operates. The Pump Combiner amplifies downlink data by using downlink data coming from the CoTX and exciting light excited by the Pump LD. The first optical transmission apparatus 11p may further includes a plurality of optical amplifiers each of which amplifies data to be transmitted through a respective one of a plurality of optical transmission paths. Further, the Pump Combiner amplifies uplink data by combining uplink data coming from the optical transmission path and the exciting light excited by the Pump LD.
The first optical transmission apparatus 11p and the second optical transmission apparatus 12 amplify the downlink data and the uplink data by using the Pump Combiner and the Pump LD. In this way, it is possible to transmit data over a longer distance than when no optical amplifier is used.
When an optical module amplifier such as an EDFA (Erbium Doped Fiber Amplifier) is used as the optical amplifier, it is necessary to provide a 2×2 optical switch in the input/output unit and control the 2×2 optical switch so that the input direction of the optical amplifier is kept in the forward direction (the direction in which signals are input from the IN terminal and output from the OUT terminal) even when the path direction is switched. The optical amplifier includes the IN terminal and the OUT terminal, and data is always input from the IN terminal and output from the OUT terminal. That is, the reverse connection is not allowed. Therefore, it is necessary to maintain the IN-OUT relationship of the optical amplifier by using a switch or the like even when the optical transmission direction is switched. This relationship for the IN-OUT direction is referred to as the forward direction.
A specific method for maintaining the input direction of the optical amplifier in the forward direction even when the path direction is switched is shown hereinafter.
As shown in
By controlling the connection terminals of the 2×2 optical switch as shown in
As shown in
As shown in
Meanwhile, the optical transmission path after the switching is a path of “First terminal of 1×2 optical switch 11615->Third terminal->Pump Combiner 11612->Third terminal of 1×2 optical switch 11614->First terminal”. Note that the exiting light of the Pump LD enters the Pump Combiner 11612 through a path of “First terminal of 1×2 optical switch 11613->Third terminal->Pump Combiner 11612”.
By controlling the connection terminals of the 1×2 optical switch as shown in
In the first example embodiment, the description of the configuration for branching/inserting an optical signal from/to an optical transmission apparatus has been omitted in order to place emphasis on the features of the present disclosure. In the second example embodiment, a case where a technology according to the present disclosure is applied to a ROADM (Reconfigurable Optical Add/Drop Multiplexer), which is an example of an actual optical transmission apparatus, will be described. The ROADM may also be referred to as a Node or a node. Therefore, each of the first and second optical transmission apparatuses 11 and 12 may be formed by a ROADM apparatus.
As shown in
An optical signal (data) input to the Pre 2 is transmitted to the WSS 1 based on the wavelength selection of the WSS 3, and output to the outside through the Boost 1 based on the wavelength selection of the WSS 1.
An optical signal (data) input to the Pre 1 is transmitted to the WSS 4 based on the wavelength selection of the WSS 2, and output to the outside through the Boost 2 based on the wavelength selection of the WSS 4.
As shown in
As shown in
It should be noted that in
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As shown in
The optical transmission control apparatus 13 selects a saturated optical transmission path of which the optical transmission usage ratio of (Node 2->Node 3) exceeds a first threshold (Step S205). Further, the optical transmission control apparatus 13 also specifies an evacuation optical transmission path of which the optical transmission usage ratio of (Node 3->Node 2) is lower than a second threshold (Step S206). The optical transmission control apparatus 13 provides a switching instruction to switch from (Node 3->Node 2) to (Node 2->Node 3) to Node 3 (Step S207). Note that the terms “amplifier” and “AMP” represent an optical amplifier.
Node 3 starts to evacuate traffic of the bidirectional fiber (saturated optical transmission path) of (Node 3->Node 2) to another fiber (evacuation optical transmission path) (Step S208). Therefore, Node 3 connects the traffic of the bidirectional fiber of (Node 3->Node 2) to the other fiber, and switches the fiber connection (Step S209). Node 3 starts control for stopping the Boost AMP (Step S210). Node 3 stops (turns off) the operation of the Boost AMP (Step S211). Node 3 reports, to the optical transmission control apparatus, that the preparation for the switching of the bidirectional fiber of (Node 3->Node 2) has been completed (Step S212).
As shown in
Node 2 starts the preparation for switching the bidirectional fiber of Node 2 (Node 2->Node 3) (Step S302). Node 2 stops (turns off) the Pre AMP (Step S304). Node 2 reports, to the optical transmission control apparatus 13, that the preparation for switching of the bidirectional fiber of Node 2 (Node 2->Node 3) has been completed (Step S305). The optical transmission control apparatus 13 provides an instruction to switch the direction of the optical transmission path to Node 3 and the AMP SW (Step S306).
Node 3 starts the change of the transmission direction (Step S308). Node 3 turns on the Pre AMP, performs path switching, and turns on the Drop side (Step S311). Node 3 reports, to the optical transmission control apparatus 13, that the transmission direction has been changed (Step S312).
Upon receiving the optical transmission path direction switching instruction, the AMP SW switches the connection direction to the amplifier (Step S307). The AMP SW starts (turns on) the connection to the amplifier (Step S309). The AMP SW provides an amplifier direction switching completion report to the optical transmission control apparatus 13 (Step S310).
The optical transmission control apparatus 13 provides, to Node 2, an instruction to start filling (e.g., supplying) the bidirectional fiber (counterpart optical transmission path) of which the direction is to be changed with traffic (Step S313). That is, the optical transmission control apparatus 13 provides, to Node 2, an instruction to fill the counterpart optical transmission path with part of the data to be transmitted through the saturated optical transmission path. Node 2 starts filling the bidirectional fiber of which the direction is to be changed with traffic (Step S314). Node 2 fills the bidirectional fiber of which the direction is to be changed with traffic (Step S315). Node 2 reports, to the optical transmission control apparatus 13, that the filling of the bidirectional fiber of which the direction is to be changed with traffic has been completed (Step S316). The optical transmission control apparatus 13 acquires the information indicating that the direction change has been completed (Step S317).
As shown in
Note that although the present disclosure is described as a hardware configuration in the above-described example embodiments, the present disclosure is not limited to the hardware configurations. In the present disclosure, the processes in each of the components can also be implemented by having a CPU (Central Processing Unit) execute a computer program.
In the above-described example embodiments, the program can be stored and provided to a computer using any type of non-transitory computer readable media. Non-transitory computer readable media include any type of tangible storage media. Examples of non-transitory computer readable media include magnetic storage media (such as floppy disks, magnetic tapes, hard disk drives, etc.), optical magnetic storage media (e.g., magneto-optical disks), CD-ROM (Read Only Memory), CD-R, CD-R/W, and semiconductor memories (such as mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory), etc.). Further, the program may be provided to a computer using any type of transitory computer readable media. Examples of transitory computer readable media include electric signals, optical signals, and electromagnetic waves. Transitory computer readable media can provide the program to a computer via a wired communication line (e.g., electric wires, and optical fibers) or a wireless communication line.
Further, although operations are described in a specific order, this should not be understood that they need to be performed in the above-shown specific or sequential order in order to achieve the desired result, or all of the above-shown operations need to be performed. In certain situations, multi-tasking and parallel processing may be advantageous. Similarly, although the details of some specific example embodiments are included in the discussion above, they should be interpreted not as a restriction on the scope of the present disclosure but as an explanation of features unique to the specific example embodiments. Specific features described in the context of individual example embodiments may be implemented in combination in one example embodiment. Conversely, various features described in the context of one example embodiment may be implemented separately in a plurality of example embodiments, or may be implemented in any suitable combination thereof. According to the present disclosure, it is possible to provide an optical transmission control apparatus, an optical transmission system, a method for an optical transmission control apparatus, and a program capable of changing the transmission capacities of optical transmission lines based on the amounts of data to be transmitted therethrough.
Although the present disclosure is described above with reference to example embodiments, the present disclosure is not limited to the above-described example embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope and spirit of the disclosure. Further, the example embodiments may be combined with one another as appropriate.
Each of the drawings is merely an example to illustrate one or more embodiments. Each of the drawing is not associated with only one specific embodiment, but may be associated with one or more other embodiments. As will be understood by those skilled in the art, various features or steps described with reference to any one of the drawings may be combined with features or steps shown in one or more other drawings in order to create, for example, an embodiment that is not explicitly shown in the drawings or described in the specification. Not all of the features or steps shown in any one of the drawings to describe an embodiment are necessarily indispensable, and some features or steps may be omitted. The order of steps in any of the drawings may be changed as appropriate.
Note that the present disclosure is not limited to the example embodiments described above, and they may be modified as appropriate without departing from the scope and spirit of the disclosure.
Further, the whole or part of the example embodiments disclosed above can be described as, but not limited to, the following supplementary notes.
(Supplementary note 1)
An optical transmission control apparatus comprising:
The optical transmission control apparatus described in Supplementary note 1, wherein the second threshold is lower than the first threshold.
(Supplementary note 3)
The optical transmission control apparatus described in Supplementary note 1, wherein each of the first and second optical transmission apparatuses is formed by a ROADM (Reconfigurable Optical Add/Drop Multiplexer) apparatus.
(Supplementary note 4)
The optical transmission control apparatus described in Supplementary note 1, further comprising a plurality of optical amplifiers each of which is configured to amplify data to be transmitted through a respective one of the plurality of optical transmission paths.
(Supplementary note 5)
An optical transmission system comprising:
a selecting unit configured to select a saturated optical transmission path of which an optical transmission usage ratio exceeds a first threshold from among the plurality of optical transmission paths,
The optical transmission system described in Supplementary note 5, wherein the first optical transmission apparatus further comprises a wavelength conversion unit configured to, when an evacuation optical wavelength of an optical carrier wave for conveying data to be transmitted through the evacuation optical transmission path and a counterpart optical wavelength of the optical carrier wave for conveying data to be transmitted through the counterpart optical transmission path are the same as each other, convert the counterpart optical wavelength into a wavelength different from the evacuation optical wavelength.
(Supplementary note 7)
The optical transmission system described in Supplementary note 5, wherein each of the first and second optical switching units is an optical switch or an optical circulator.
(Supplementary note 8)
The optical transmission system described in Supplementary note 5, wherein each of the first downlink wavelength selecting switching unit, the first uplink wavelength selecting switching unit, the second downlink wavelength selecting switching unit, and the second uplink wavelength selecting switching unit is a wavelength selective switch (WSS: Wavelength Selective Switch).
(Supplementary note 9)
A method for an optical transmission control apparatus, comprising:
specifying an evacuation optical transmission path of which an optical transmission direction is opposite to that of the saturated optical transmission path and of which an optical transmission usage ratio is lower than a second threshold from among the plurality of optical transmission paths;
transmitting, to the first and second optical transmission apparatuses, a transfer control signal for transferring data to be transmitted through a counterpart optical transmission path to the evacuation optical transmission path, the counterpart optical transmission path being an optical transmission path which is paired with the saturated optical transmission path and of which an optical transmission direction is opposite to that of the saturated optical transmission path;
The optical transmission system described in Supplementary note 5, wherein the second threshold is lower than the first threshold.
(Supplementary note 11)
The optical transmission system described in Supplementary note 5, wherein each of the first and second optical transmission apparatuses is formed by a ROADM (Reconfigurable Optical Add/Drop Multiplexer) apparatus.
(Supplementary note 12)
The optical transmission system described in Supplementary note 5, further comprising a plurality of optical amplifiers each of which is configured to amplify data to be transmitted through a respective one of the plurality of optical transmission paths.
(Supplementary note 13)
The method for an optical transmission control apparatus described in Supplementary note 9, wherein the second threshold is lower than the first threshold.
(Supplementary note 14)
The method for an optical transmission control apparatus described in Supplementary note 9, wherein each of the first and second optical transmission apparatuses is formed by a ROADM (Reconfigurable Optical Add/Drop Multiplexer) apparatus.
(Supplementary note 15)
The method for an optical transmission control apparatus described in
Supplementary note 9, wherein the optical transmission control apparatus further comprises a plurality of optical amplifiers each of which is configured to amplify data to be transmitted through a respective one of the plurality of optical transmission paths.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2023-191692 | Nov 2023 | JP | national |
