Enhanced polarization mode dispersion of optical channels
View Patent ↗A device receives, from an optical receiver, performance information associated with an optical channel generated by an optical transmitter, and determines, based on the received performance information, a wavelength that minimizes polarization mode dispersion (PMD) associated with the optical channel. The device also provides, to the optical transmitter, a request to adjust an optical channel wavelength to the determined wavelength.
1. A computing device-implemented method, comprising:
receiving, from an optical receiver, performance information associated with an optical channel generated by an optical transmitter, where the performance information is associated with operating the optical channel, during a first time period, at a first wavelength, and where the performance information includes a received differential group delay (DGD REC ) associated with the optical channel at the first wavelength during the first time period;
determining, based on the received performance information and the first wavelength, a second wavelength, where determining the second wavelength includes:
identifying an optimal differential group delay (DGD OPT ) associated with the optical channel, where the DGD OPT is a smallest differential group delay value observed on the optical channel prior to the first time period, and where the DGD OPT is associated with a particular wavelength,
comparing the DGD REC to the DGD OPT ,
determining, when the DGD REC is less than the DGD OPT , the second wavelength based on the first wavelength, and
determining, when the DGD REC is not less than the DGD OPT , the second wavelength based on the particular wavelength; and
providing, to the optical transmitter, a request to adjust an optical channel wavelength to the determined second wavelength, where the optical transmitter adjusts the optical channel wavelength, during a second time period that is after the first time period, to the determined second wavelength based on the request.
2. The computing device-implemented method of claim 1 , where the computing device comprises a control system coupled to the optical transmitter and the optical receiver.
3. The computing device-implemented method of claim 1 , where the optical channel comprises a dense wavelength division multiplexing (DWDM) channel.
4. The computing device-implemented method of claim 1 , where the performance information further comprises at least one of:
the optical channel wavelength, or
a polarization mode dispersion (PMD) associated with the optical channel.
5. The computing device-implemented method of claim 1 , where identifying the second wavelength includes:
determining a proposed wavelength based on the DGD REC ;
identifying a minimum polarization mode dispersion (PMD MIN ) associated with the optical channel, where the PMD MIN is a smallest PMD value observed on the optical channel prior to the first time period;
determining whether a polarization mode dispersion associated with the optical channel at the proposed wavelength (PMD PROPOSED ) is equal to the PMD MIN ;
selecting, when the PMD PROPOSED is equal to the PMD MIN , the new wavelength as the second wavelength; and
when the PMD PROPOSED is greater than the PMD MIN :
modifying the proposed wavelength based on the PMD MIN , and
identifying the second wavelength based on the modified proposed wavelength.
6. The computing device-implemented method of claim 1 , where the determined second wavelength is associated with a minimum polarization mode dispersion (PMD) and a minimum differential group delay (DGD) respectively, of possible PMDs and possible DGDs associated with a useable bandwidth of the optical channel.
7. The computing device-implemented method of claim 1 , where the optical receiver is provided in a first network device and the optical transmitter is provided in a second network device.
8. The computing device-implemented method of claim 7 , where each of the first network device and the second network device comprises one or more of:
a gateway,
a router,
a switch,
a firewall,
a network interface card (NIC),
a hub,
a bridge,
a proxy server, or
an optical add-drop multiplexer (OADM).
9. A device, comprising:
a memory to store a plurality of instructions; and
a processor to execute instructions in the memory to:
receive, from an optical receiver, performance information associated with an optical channel generated by an optical transmitter, where the performance information is associated with operating the optical channel at a first wavelength, and where the performance information includes a differential group delay (DGD REC ) associated with the optical channel at the first wavelength,
determine, based on the received performance information and the first wavelength, a second wavelength that reduces polarization mode dispersion (PMD) associated with the optical channel, where the processor, when determining the second wavelength, is further to:
identify an optimal differential group delay (DGD OPT ) associated with the optical channel, where the DGD OPT is a smallest differential group delay value previously observed on the optical channel,
compare the DGD REC with the DGD OPT ,
determine, when the DGD REC is less than the DGD OPT , the second wavelength based on the first wavelength, and
determine, when the DGD REC is not less than the DGD OPT , the second wavelength based on a particular wavelength associated with the DGD OPT , and provide, to the optical transmitter, a request to adjust an optical channel wavelength to the determined second wavelength.
10. The device of claim 9 , where the device comprises a control system coupled to the optical transmitter and the optical receiver.
11. The device of claim 9 , where the optical channel comprises a dense wavelength division multiplexing (DWDM) channel.
12. The device of claim 9 , where the performance information further comprises at least one of:
the optical channel wavelength, or
the PMD associated with the optical channel.
13. The device of claim 9 , where processor further executes instructions in the memory to:
determine whether the PMD associated with the optical channel, at the second wavelength, can be reduced, and
generate a request to adjust the second wavelength when the PMD associated with the optical channel, at the second wavelength, can be reduced.
14. The device of claim 9 , where the determined second wavelength is associated with a minimum PMD and a minimum DGD respectively, of possible PMDs and possible DGDs associated with a useable bandwidth of the optical channel.
15. A system, comprising:
means for determining performance information associated with an optical channel, where the performance information is associated with operating, at a first wavelength, the optical channel between an optical transmitter and an optical receiver, and where the performance information includes a differential group delay (DGD) associated with the optical channel at the first wavelength;
means for determining, based on the received performance information and the first wavelength, a second wavelength, where the means for determining the second wavelength includes:
means for identifying an optimal differential group delay (DGD OPT ) associated with the optical channel, where the DGD OPT is a smallest differential group delay value observed on the optical channel prior to the first time period, and where the DGD OPT is associated with a particular wavelength,
means for comparing the DGD REC to the DGD OPT ,
means for determining, when the DGD REC is less than the DGD OPT , the second wavelength based on the first wavelength, and
means for determining, when the DGD REC is not less than the DGD OPT , the second wavelength based on the particular wavelength; and
means for causing the optical transmitter to adjust an optical channel wavelength to the determined second wavelength.
16. The system of claim 15 , further comprising:
means for determining whether polarization mode dispersion (PMD) associated with the optical channel, at the second wavelength, can be reduced, and
means for generating a request to adjust the second wavelength when the PMD associated with the optical channel, at the second wavelength, can be reduced.
17. The system of claim 15 , where the system is included in a control system coupled to the optical transmitter and the optical receiver.
18. The system of claim 15 , where the optical channel comprises a dense wavelength division multiplexing (DWDM) channel.
19. The system of claim 15 , where the performance information further comprises at least one of:
the optical channel wavelength, or
the PMD value associated with the optical channel.
20. The system of claim 15 , where the determined second wavelength is associated with a minimum PMD and a minimum DGD respectively, of possible PMDs and possible DGDs associated with a useable bandwidth of the optical channel.