System and method for cross-phase modulation noise reduced transmission in hybrid networks

Patent metadata

Field	Value
Publication number	US-9515734-B2
Application number	US-83812910-A
Country	US
Kind code	B2
Filing date	Jul 16, 2010
Priority date	Jul 16, 2010
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

In one embodiment, a method for receiving optical signals includes receiving a first set of one or more signals and a second set of one or more signals, determining a block length used to process the first set of signals, and processing the first set of signals using the block length. The first set of signals and the second set of signals are separated by a guard band. The block length is based upon the width of the guard band.

First claim

What is claimed is:

1. A method for receiving optical signals, comprising:
receiving a first set of one or more signals and a second set of one or more signals, wherein the first set of signals and the second set of signals are separated by a guard band;
determining a block length used to process the first set of signals, wherein the block length is based upon the width of the guard band; and
processing the first set of signals using the block length.

2. The method of claim 1 , wherein the block length is a fixed value.

3. The method of claim 1 , wherein:
the block length comprises a value less than an upper threshold, wherein the guard band comprises a zero width.

4. The method of claim 1 , wherein:
the block length comprises the largest size for which a signal performance of the first set of signals is within a pre-defined acceptable signal quality range, given a value of the guard band and a range of acceptable values for the block length.

5. The method of claim 1 , wherein:
the guard band comprises the smallest width for which a signal performance of the first set of signals is within a pre-defined acceptable signal quality range, given a value of the block length.

6. The method of claim 1 , wherein determining the block length comprises evaluating a signal performance of the first set of signals to be received as a function of the guard band and the block length.

7. The method of claim 1 , wherein the first set of signals comprises a phase-shift-modulated signal, and the second set of signals comprises an on-off-keyed signal.

8. The method of claim 7 , wherein the first set of signals comprises a 100 G signal, and the second set of signals comprises a 10 G signal.

9. The method of claim 7 , wherein the first set of signals comprises a 40 G signal, and the second set of signals comprises a 40 G signal.

10. The method of claim 7 , wherein the first set of signals comprises a 40 G signal, and the second set of signals comprises a 10 G signal.

11. An apparatus for optical communication, comprising:
a receiver coupled to an optical network, the optical network transporting a first set of one or more signals and a second set of one or more signals, wherein the first set of signals and the second set of signals are separated by a guard band;
the receiver configured to:
receive the first set of signals;
determine a block length used to process the first set of signals, wherein the block length is based upon the width of the guard band; and
process the first set of signals using the block length.

12. The apparatus of claim 11 , wherein the block length is a fixed value.

13. The apparatus of claim 11 , wherein:
the block length comprises a value less than an upper threshold, wherein the guard band comprises a zero width.

14. The apparatus of claim 11 , wherein:
the block length comprises the largest size for which a signal performance of the first set of signals is within a pre-defined acceptable signal quality range, given a value of the guard band and a range of acceptable values for the block length.

15. The apparatus of claim 11 , wherein:
configuring the receiver to determine the block length comprises configuring the receiver to access an evaluation of a signal performance of the first set of signals to be received as a function of the guard band and the block length.

16. The apparatus of claim 11 , wherein the receiver comprises a coherent receiver.

17. The apparatus of claim 11 , wherein the first set of signals comprises a phase-shift-modulated signal, and the second set of signals comprises an on-off-keyed signal.

18. The apparatus of claim 17 , wherein the first set of signals comprises a 100 G signal, and the second set of signals comprises a 10 G signal.

19. The apparatus of claim 17 , wherein the first set of signals comprises a 40 G signal, and the second set of signals comprises a 40 G signal.

20. The apparatus of claim 17 , wherein the first set of signals comprises a 40 G signal, and the second set of signals comprises a 10 G signal.

21. An article of manufacture, comprising:
a computer readable medium; and
computer-executable instructions carried on the computer readable medium, the instructions readable by a processor, the instructions, when read and executed, for causing the processor to:
determine a block length used to process a first set of signals; and
process the first set of signals using the block length;

wherein:
the first set of one or more signals and a second set of one or more signals are transported by an optical network;
the first set of signals and the second set of signals are separated by a guard band; and
the block length is based upon the width of the guard band.

22. The article of claim 21 , wherein the block length is a fixed value.

23. The article of claim 21 , wherein:
the block length comprises a value less than an upper threshold, wherein the guard band comprises a zero width.

24. The article of claim 21 , wherein:
the block length comprises the largest size for which a signal performance of the first set of signals is within a pre-defined acceptable signal quality range, given a value of the guard band and a range of acceptable values for the block length.

25. The article of claim 21 , wherein:
the guard band comprises the smallest width for which a signal performance of the first set of signals is within a pre-defined acceptable signal quality range, given a value of the block length.

26. The article of claim 21 , determining the block length comprises evaluating a signal performance of the first set of signals to be received as a function of the guard band and the block length.

27. The article of claim 21 , wherein the first set of signals comprises a phase-shift-modulated signal, and the second set of signals comprises an on-off-keyed signal.

28. The article of claim 27 , wherein the first set of signals comprises a 100 G signal, and the second set of signals comprises a 10 G signal.

29. The article of claim 27 , wherein the first set of signals comprises a 40 G signal, and the second set of signals comprises a 40 G signal.

30. The article of claim 27 , wherein the first set of signals comprises a 40 G signal, and the second set of signals comprises a 10 G signal.

Assignees

• Kim Inwoong
• Vassilieva Olga I
• Fujitsu Ltd

Inventors

• Kim Inwoong
• Vassilieva Olga I

Classifications

• H04B10/6163

  Compensation of non-linear effects in the fiber optic link, e.g. self-phase modulation [SPM], cross-phase modulation [XPM], four wave mixing [FWM] · CPC title

• H04B10/0795

  Performance monitoring; Measurement of transmission parameters · CPC title

• H04J14/0205

  Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping · CPC title

• H04B10/2557 Primary

  Cross-phase modulation [XPM] · CPC title

• H04J14/0224

  Irregular wavelength spacing, e.g. to accommodate interference to all wavelengths · CPC title