The present application relates to a wavelength division multiplexing/de-multiplexing optical assembly for high speed parallel long distance transmission, which belongs to the technical field of optical transceiver modules in optical communication.
With the ever-increasing of the transmission capacity in the communication field, the conventional transmission techniques have failed to meet the demands for transmission capacity and transmission speed. In the fields of data center application, as well as internet core node, education organization, search engine, large-scale web site, high performance computer, and so on, in order to avoid the insufficiency of the bandwidth resources of the central net, network operators and service providers are programming deployment of next generation internet protocol. The Institute of Electrical and Electronics Engineers (IEEE) has made the unified standard for 40 Gbps and 100 Gbps Ethernet under P802.3ba Internet Engineering Task Force.
However, with the rapid increasing of the demand for communication bandwidth, the existing communication system faces the two challenges of capacity and energy consumption. The research and development of the parallel optical module is increasing because it can provide larger bandwidth with smaller volume and lower energy consumption. The parallel optical module refers to a single module in which several lasers respectively align with several optical fibers, such as a four-channel short range transceiver module which is suitable for the short range high bandwidth computing and switching application, it is integrated with four independent transmitting and receiving channels, and is coupled to a multi-mode ribbon optical fiber with 12 channels. Thanks to the low power consumption resulting from the miniaturization and integration of devices, the heat generated and dissipated from the parallel optical module is much less than that from multiple discrete elements, thereby increasing the reliability of the device and the whole system. Therefore, in case a sub-component of the parallel optical module is to be aligned with a positioning component, a high accuracy and small errors are required so as to ensure the highest possible optical coupling efficiency.
The objection of the present invention is to overcome the shortcomings of the prior art, and provide a wavelength division multiplexing/de-multiplexing optical assembly which can meet the requirements for high speed parallel long distance transmission, and effectively resolve the problems of the conventional wavelength division multiplexing/de-multiplexing optical assembly, such as large insert loss, low coupling efficiency, short transmission distance, low reliability, and difficulties for small outline package.
The objection of the present application is achieved by the following technical schemes:
A wavelength division multiplexing/de-multiplexing optical assembly for high speed parallel long distance transmission comprises a transmitting terminal, a transmitting terminal optical lens group, a receiving terminal optical lens group and a receiving terminal disposed in turn; the transmitting terminal is a laser group with a coarse wavelength division multiplexing wave length according to the provision of IEEE 802.3ba; the receiving terminal is a detector group with a coarse wavelength division multiplexing wave length according to the provision of IEEE 802.3ba; the transmitting terminal optical lens group comprises a silicon lens group, an optical adjusting plate group, a lower layer silicon lens array, a lower layer filter group, a lower layer free space wavelength division multiplexer, an optical isolator and a focusing lens; the receiving terminal optical lens group comprises a collimating lens, an upper layer free space wavelength division multiplexer, an upper layer filter group and an upper layer silicon lens array; wherein, the output terminal of the laser group is provided with the silicon lens group, the optical adjusting plate group, the lower layer silicon lens array, the lower layer filter group, and the lower layer free space wavelength division multiplexer, the optical isolator, and the focusing lens arranged in turn; the output terminal of the focusing lens is coupled with an input optical fiber; an output optical fiber is coupled with the collimating lens; the output terminal of the collimating lens is coupled with a prism; the output terminal of the prism is provided with the upper layer free space wavelength division multiplexer, the upper layer filter group, the upper layer silicon lens array and the detector group arranged in turn.
Preferably, with respect to the wavelength division multiplexing/de-multiplexing optical assembly for high speed parallel long distance transmission described above, wherein, the laser group is an array of lasers, of which effective illuminating areas are aligned on a same straight line with equal intervals.
More preferably, with respect to the wavelength division multiplexing/de-multiplexing optical assembly for high speed parallel long distance transmission described above, wherein, the detector group is an array of detectors, of which effective receiving areas are aligned on a same straight line with equal intervals.
More preferably, with respect to the wavelength division multiplexing/de-multiplexing optical assembly for high speed parallel long distance transmission described above, wherein, the optical adjusting plate group comprises at least one optical adjusting plate, and an adjusting cap for supporting the optical adjusting plate; the adjusting cap is in the shape of a hemispherical or a cube.
More preferably, with respect to the wavelength division multiplexing/de-multiplexing optical assembly for high speed parallel long distance transmission described above, wherein, both of the upper layer filter group and the lower layer filter group are bandpass filter group.
More preferably, with respect to the wavelength division multiplexing/de-multiplexing optical assembly for high speed parallel long distance transmission described above, wherein, the upper layer free space wavelength division multiplexer is fixed in the positioning groove of the housing, the main body of the upper layer free space wavelength division multiplexer is a prism, which comprises two surfaces for light transmission path, wherein one of the surfaces is coated with a total reflection film, and is provided with a window for incidence or exit of optical signal, and the other surface is combined with the upper layer filter group.
More preferably, with respect to the wavelength division multiplexing/de-multiplexing optical assembly for high speed parallel long distance transmission described above, wherein, the lower layer free space wavelength division multiplexer is fixed in the positioning groove of the housing, the main body of the upper layer free space wavelength division multiplexer is a prism, which comprises two surfaces for light transmission path, wherein one of the surfaces is coated with a total reflection film, and is provided with a window for incidence or exit of optical signal, and the other surface is combined with the upper layer filter group.
More preferably, with respect to the wavelength division multiplexing/de-multiplexing optical assembly for high speed parallel long distance transmission described above, wherein, the collimating lens, the silicon lens group and the optical adjusting plate group are coated with anti-reflection film.
The technical solutions of the present invention will be further described in conjunction with the accompanying drawings:
The elements in the figures are denoted as follows:
laser group; 2. silicon lens group; 3. optical adjusting plate group;
4. lower layer silicon lens array; 5. lower layer filter group;
6. lower layer free space wavelength division multiplexer;
7. optical isolator; 8. focusing lens;
10. collimating lens; 11. upper layer free space wavelength division multiplexer;
12. upper layer filter group; 13. upper layer silicon lens array;
14. detector group; 15. housing; 16. prism.
A wavelength division multiplexing/de-multiplexing optical assembly for high speed parallel long distance transmission comprises a transmitting terminal, a transmitting terminal optical lens group, a receiving terminal optical lens group and a receiving terminal disposed in turn. As shown in
As shown in
The optical adjusting plate group 3 comprises at least one optical adjusting plate, and an adjusting cap for supporting the optical adjusting plate; the adjusting cap is in the shape of a hemispherical or a cube; the optical path can be micro-adjusted by using the “optical lever” principle.
The lower layer silicon lens array 4 comprises a focusing lens, a collimating lens and a focusing lens arranged in turn. Optical signal from the transmitting terminal is focused by a focusing lens, collimated by a collimating lens, then multiplexed, and coupled into an optical fiber or other optical paths via a focusing lens.
The lower layer filter group 5 is a bandpass filter group.
The lower layer free space wavelength division multiplexer 6 fixed in the positioning groove of the housing 15 comprises two surfaces for light transmission path, wherein one of the surfaces is coated with a total reflection film, and is provided with a window for incidence or exit of optical signal, and the other surface is combined with the upper layer filter group 5.
Each of the filters corresponds to optical signal with a specific wavelength, and is disposed in a suitable position in the light transmission path, the lower layer free space wavelength division multiplexer 6 has functions of wavelength division multiplexing and de-multiplexing, the wavelength division multiplexing and de-multiplexing of an optical signal can be realized by using at least one or two or more filter array wavelength division multiplexers.
The optical isolator 7 is disposed in a suitable position in the light transmission path, for reducing the effect of reflection light on laser.
Positioning grooves for various components are provided inside the housing 15, which effectively reduce the difficulty in manufacturing the optical components.
As shown in
All filters of the upper layer filter group 12 are bandpass filters.
The upper layer silicon lens array 13 is used for directing optical signal to couple with the detector 14.
The detector group 14 is an array of detectors, of which effective receiving areas are aligned on a same straight line with equal intervals.
The free space wavelength division multiplexer is divided into two layers, that is, the lower layer free space wavelength division multiplexer 6 and the upper layer free space wavelength division multiplexer 11, the two layers may be separate or integral.
The constitution and structure of the wavelength division multiplexing/de-multiplexing transmitting terminal optical assembly and the principle of wavelength division multiplexing optical path are illustrated in
The constitution and structure of the wavelength division multiplexing/de-multiplexing receiving terminal optical assembly and the principle of wavelength division multiplexing optical path are illustrated in
In summary, with respect to the wavelength division multiplexing/de-multiplexing optical assembly for high speed parallel long distance transmission, the function of wavelength division multiplexing/de-multiplexing is realized by using a filter array structure, and in each channel of the transmitting terminal, the optical adjusting plate is used to perform micro-adjustment to the light transmission path by using the principle of “optical lever”, which is beneficial to the coupling and stability of the optical paths. Moreover, in each channel of the transmitting terminal, the optical signals are coupled into the single mode optical fibers via the lens group, the coupling efficiency is high and up to 80%, which is very helpful for the long distance transmission of the optical signal; the receiving terminal optical components realize the de-multiplexing of optical signal by using the filter array structure. The wavelength division multiplexing/de-multiplexing optical assembly of the present invention uses a high density and small space packaged chip, moreover, the receiving terminal and the transmitting terminal are arranged in two layers, i.e., an upper layer and a lower layer, which largely reduce the volume, and is very helpful to realize the miniaturization of the parallel optical transceiver modules. Moreover, the “optical lever” function of the optical adjusting plate reduces the precision requirements for chip placement, simplifies the process of design and assembling, and greatly reduces production cost. The wavelength division multiplexing/de-multiplexing optical assembly can be produced with the existing manufacturing technology of optical components, and is very suitable for batch production. The present invention overcomes the shortcomings of discrete components of the prior art, such as large volume, large loss, high requirement for package accuracy, high production cost, and provides a pluggable parallel optical transceiver module with high alignment accuracy and low operation error.
It should be understood by those skilled in the art that what described above are preferred embodiments of the present invention, various modifications and replacements may be made therein without departing from the principle of the present invention, which should also be seen in the scope of the present invention.
Number | Date | Country | Kind |
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201210184192.7 | Jun 2012 | CN | national |