FIELD OF THE INVENTION
The present invention generally relates to wireless non-intrusive monitoring of light signals between two fiber optic communication lines.
BACKGROUND OF THE INVENTION
Non-intrusive monitoring of light signals between two fiber optic communication lines is required in many applications, such as distribution frames, patch panels, fiber optic adapters and termination devices. Monitoring is required in both transmission and reception. One example of wireless remote monitoring of active optical lines is described in PCT Patent Application PCT/US2013/073987, entitled “Non-Intrusive Monitoring Optical Connection Apparatus” to Benny Gaber, Israel.
SUMMARY
The present invention seeks to provide methods and apparatus for non-intrusive wireless remote monitoring of light signals between two fiber-optic communication lines, such as distribution frames, patch panels, fiber optic adapters and termination devices. Most of the light from the transmitting fiber goes to the receiving fiber in the fibers core, in both directions, whereas a small part of the light exits from an opening in the cladding onto a photo-detector.
In one embodiment, a short ferrule is disposed between two fiber optic communication line connectors or the ferrule end of a fiber-optic line having an opening in its cladding. Most of the light from the transmitting fiber goes to the receiving fiber through the fibers core and part of the light travelling in the cladding is harvested from the opening in the cladding by a photo-detector near or attached to the opening and connected to an ASIC (Application-Specific Integrated Circuit) and RFT (Radio Frequency Transponder) antenna. A monitoring antenna activates the RFT and reads the photo-detector data.
The optical element harvests only a very small part of the light signals, thus achieving efficient non-intrusive monitoring without interrupting the ongoing transmission of optical information data in both directions between the two fiber optic communication lines.
The ASIC has a unique ID that differentiates between individual connections. The unique ASIC ID allows for an automated cable connectivity management system of the physical layer.
BRIEF DESCRIPTION OF THE DRAWINGS
The disclosure will be understood and appreciated more fully from the following detailed description taken in conjunction with the drawings in which:
FIG. 1A is a schematic general view illustration of a communication patch panel cabinet with antenna for activating and reading the RFT (radio frequency ID) non-intrusive monitoring, in accordance with an embodiment of the present invention;
FIG. 1B is a partial view of FIG. 1A;
FIG. 2A is a general view of fiber optic connector with RFT on ferrule, in accordance with an embodiment of the present invention;
FIG. 2B is a schematic illustration of a fiber optic end connector with photo-detector attached to RFT, in accordance with an embodiment of the present invention;
FIG. 2C is a schematic sectional view of FIG. 2A;
FIG. 3 is a schematic illustration of a ferrule with a cut in its cladding with ASIC and photo-detector attached to RFT antenna on photo-detector holder, in accordance with an embodiment of the present invention;
FIG. 4 is a schematic illustration of the RFT antenna on the fiber optic connector, in accordance with an embodiment of the present invention;
FIG. 5 is a schematic illustration the RFT antenna on the fiber optic end line, in accordance with an embodiment of the present invention; and
FIG. 6 is a schematic illustration of a conducting coating on ferrule connecting photo-detector to RFT antenna, in accordance with an embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENTS
Reference is now made to FIG. 2A, which illustrates a monitoring system (apparatus) 13 in accordance with an embodiment of the invention. The system includes two fiber optic lines 6 and 6′, one of which is a transmitting fiber 6 and the other is a receiving fiber 6′. Each line ends in an optical connector 5. The connectors 5 may be connected via a ferrule 7.
FIG. 2B illustrates a fiber optic end connector 5 with a ferrule connection 7′ at the end face of the connector.
As seen in FIG. 2C and more in detail in FIG. 3, the optic line 6 has a cutout or opening in its cladding. A photo-detector 9 is mounted on a photo-detector holder 8, which is assembled or attached on the cutout (holder 8 is also shown separately in FIG. 2A). The exposed cladding 11 is clearly seen in FIG. 3. The photo-detector 9 is arranged to detect light emitted (“harvested”) from the exposed cladding 11. An ASIC (Application-Specific Integrated Circuit) 16 is mounted on holder 8. ASIC 16 has an identifier (ID) unique for the photo-detector data detected by photo-detector 9.
A transmitting antenna 10 is also located on holder 8 and is operative to transmit the photo-detector data and the ID to an external monitoring system 1 (FIG. 1A). For example, transmitting antenna 10 may be a RFT (Radio Frequency Transponder) antenna.
Reference is now made to FIGS. 1A and 1B, which illustrate an example of the non-intrusive monitoring system 1 implemented in a communication patch panel cabinet 4. The cabinet 4 includes a plurality of connectors 5. As described above, for each connector there is a transmitting antenna. A monitoring antenna 2 is mounted on or near cabinet 4 and is arranged to activate the RFT antenna (FIG. 2C), which when activated transmits the data and ID to monitoring antenna 2 for further processing.
The transmitting antenna can be placed in various places. As seen in FIG. 4, an RFT antenna 12 is disposed on connector 5. As seen in FIG. 5, an RFT antenna 14 is disposed on a fiber optic end line.
Reference is now made to FIG. 6. In any of the above-described embodiments, a conductive coating 15 may be deposited or otherwise formed on ferrule 7 for electrically connecting the photo-detector and ASIC to the RFT antenna.
Patent Application
20170176696
