Polarization dependent loss mitigation
View Patent ↗A system, comprising an optical transmitter including a memory and one or more processors, wherein the one or more processors are in communication with the memory and configured to perform creating a first signal and a second signal, wherein the first signal and the second signal are each polarized; rotating a polarization of the first signal and the second signal by θ degrees; adding a differential group delay (DGD) to the second optical signal; generating a first optical signal from the first signal; and generating a second optical signal from the second signal.
1. A method of mitigating polarization dependent loss, the method comprising:
generating a first signal having a first polarization and a second signal having a second polarization;
rotating a polarization of the first signal and the second signal by 0 degrees;
adding a first delay to the second signal;
generating a first optical signal from the first signal;
generating a second optical signal from the second signal;
receiving the first optical signal and the second optical signal; and
adding the first delay to the first optical signal.
2. The method of claim 1 , wherein the first delay is between about 1 symbol and 40 symbols.
3. The method of claim 1 , further comprising:
sending the first optical signal and the second optical signal across a fiber link; and
wherein the first delay is greater than a delay of the fiber link.
4. The method of claim 1 , wherein the first optical signal is vertically polarized and the second optical signal is horizontally polarized.
5. The method of claim 1 , wherein the first delay is greater than about 1 symbol.
6. The method of claim 1 further comprising reversing a polarization of the first optical signal and the second optical signal by 0 degrees.
7. The method of claim 6 , wherein θ is about 45 degrees.
8. A non-transitory machine readable medium storing code, which when executed by a processor is configured to:
create a first signal and a second signal;
rotate a polarization of the first signal and the second signal by θ degrees, wherein θ is about 45 degrees;
add a first delay to the second signal;
generate a first optical signal from the first signal;
generate a second optical signal from the second signal.
9. The non-transitory machine readable medium storing code of claim 8 , wherein the first delay is between about 1 symbol and 40 symbols.
10. The non-transitory machine readable medium storing code of claim 8 , wherein a polarization of the first signal and a polarization of the second signal are orthogonal.
11. The non-transitory machine readable medium storing code of claim 8 , wherein, when executed by a processor, is further configured to:
generate a first optical signal from the first signal; and
generate a second optical signal from the second signal.
12. The non-transitory machine readable medium storing code of claim 11 , wherein, when executed by a processor, is further configured to:
send the first optical signal and the second optical signal across a fiber link; and
wherein the first delay is greater than a delay of the fiber link.
13. The non-transitory machine readable medium storing code of claim 11 , wherein the first optical signal is vertically polarized and the second optical signal is horizontally polarized.
14. The non-transitory machine readable medium storing code of claim 8 , wherein, when executed by a processor, is further configured to:
reverse a polarization of the first optical signal and the second optical signal by θ degrees.
15. The non-transitory machine readable medium storing code of claim 14 , wherein θ is about 45 degrees.
16. The system of claim 14 , wherein θ is about 45 degrees.
17. A system comprising:
an optical transmitter configured to perform:
creating a first signal and a second signal, wherein the first signal and the second signal are each polarized;
rotating a polarization of the first signal and the second signal by θ degrees;
adding a first delay to the second signal; and
adding the first delay to the first signal such that polarization dependent loss is reduced.
18. The system of claim 17 , wherein the first delay is between about 1 symbol and about 40 symbols.
19. The system of claim 17 , wherein the first delay is greater than about 1 symbol.
20. The system of claim 17 , wherein a polarization of the first signal and a polarization of the second signal are orthogonal.
21. The system of claim 17 , wherein one or more processors are further configured to perform:
generating a first optical signal from the first signal; and
generating a second optical signal from the second signal.
22. The system of claim 21 , wherein the one or more processors are further configured to perform:
sending the first optical signal and the second optical signal across a fiber link; and
wherein the first delay is greater than a delay of the fiber link.
23. The system of claim 21 , wherein the first optical signal is vertically polarized and the second optical signal is horizontally polarized.
24. The system of claim 17 , wherein one or more processors are further configured to perform: reversing a polarization of the first signal and the second signal by θ degrees.
25. A system comprising:
an optical transmitter including a memory and one or more processors, wherein the one or more processors are in communication with the memory and configured to:
create a first signal and a second signal;
add a first delay to the second signal; and
generate a second optical signal from the second signal, wherein one or more processors are further configured to perform reversing a polarization of the first signal and the second signal by θ degrees.