Method and system of automatic regeneration of optical signals

• US 8,873,950 B2
• Filed: 10/04/2011
• Issued: 10/28/2014
• Est. Priority Date: 10/04/2011
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Akasaka, Youichi
• Primary Examiner(s): Jacob, Oommen
• Application Number:
  US13/252,814
• Publication Number:
  US 20130084064A1
• Time in Patent Office: 1,120 Days
• Field of Search: 398/9, 398/25, 398/34, 398/175, 398/177
• US Class Current: 398/34
• CPC Class Codes: H04B 10/0795 Performance monitoring; Measurement of transmission parameters
• CPC Class Codes: H04B 10/29 Repeaters
• CPC Class Codes: H04J 14/021 Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04J 14/0256 at the optical channel layer

Abstract

In accordance with the present disclosure, disadvantages and problems associated with transmitting high capacity (e.g., 400 G) optical signals may be reduced. In accordance with an embodiment of the present disclosure a method for regenerating an optical signal comprises receiving an optical signal at a network element and measuring a performance characteristic of the optical signal. The method further comprises determining that the optical signal needs regeneration based on the performance characteristic of the optical signal. The method additionally comprises performing signal regeneration of the optical signal based on the determination that the optical signal needs regeneration.

Claims

1. A method for regenerating an optical signal comprising:

receiving an optical signal at a network element;

measuring a performance characteristic of the optical signal;

determining a modulation format of the optical signal;

determining that the optical signal needs regeneration based on the performance characteristic of the optical signal; and

performing signal regeneration of the optical signal based on the determination that the optical signal needs regeneration and based on the modulation format of the optical signal.

2. The method of claim 1, wherein the optical signal comprises a channel of a transmission band associated with an optical network.

3. The method of claim 1, wherein the optical signal comprises one of a plurality of channels of a wavelength division multiplexed (WDM) signal.

4. The method of claim 1, wherein performing signal regeneration comprises at least one of compensating for polarization dependent loss, compensating for chromatic dispersion, amplifying signal power of the optical signal, removing amplitude spontaneous emission, removing phase noise and correcting the signal clock.

5. The method of claim 1, wherein performing signal regeneration comprises performing a partial transmission band regeneration process with respect to a transmission band associated with the optical signal.

6. The method of claim 1, wherein performing signal regeneration comprises performing a channel-based regeneration process with respect to a transmission band associated with the optical signal.

7. The method of claim 1, wherein performing signal regeneration comprises performing a full transmission band regeneration process with respect to a transmission band associated with the optical signal.

8. The method of claim 1, further comprising:

comparing the performance characteristic with a threshold value associated with the performance characteristic; and

determining that the optical signal needs regeneration based on the comparison between the performance characteristic and the threshold value.

9. The method of claim 8, further comprising determining the threshold value based on a reach of the optical signal and an intended destination of the optical signal.

10. The method of claim 1, wherein measuring the performance characteristic comprises at least one of measuring polarization mode dispersion (PMD) of the optical signal, an optical signal to noise ratio (OSNR) of the optical signal, phase noise of the optical signal, a bit error rate (BER) of the optical signal, an eye-opening associated with the optical signal, and chromatic dispersion of the optical signal.

11. The method of claim 1, further comprising performing signal regeneration using a signal regeneration process that performs optical signal regeneration in the optical domain.

12. A network element comprising:

an optical performance monitor (OPM) configured to measure a performance characteristic of an optical signal;

an optical signal regeneration unit communicatively coupled to the OPM and configured to perform signal regeneration of the optical signal;

a controller communicatively coupled to the OPM and signal regeneration unit and configured to;

determine a modulation format of the optical signal;

determine that the optical signal needs regeneration based on the performance characteristic of the signal and based on the modulation format of the optical signal; and

direct the optical signal from the OPM to the regeneration unit based on the determination that the optical signal needs regeneration.

13. The network element of claim 12, wherein the optical signal comprises a channel of a transmission band associated with an optical network.

14. The network element of claim 12, wherein the optical signal comprises one of a plurality of channels of a wavelength division multiplexed (WDM) signal.

15. The network element of claim 12, wherein the regeneration unit is configured to perform at least one of compensating for polarization dependent loss, compensating for chromatic dispersion, amplifying signal power of the optical signal, removing amplitude spontaneous emission, removing phase noise and correcting the signal clock.

16. The network element of claim 12, wherein the regeneration unit is configured to perform a partial transmission band regeneration process with respect to a transmission band associated with the optical signal.

17. The network element of claim 12, wherein the regeneration unit is configured to perform a channel-based regeneration process with respect to a transmission band associated with the optical signal.

18. The network element of claim 12, wherein the regeneration unit is configured to perform a full transmission band regeneration process with respect to a transmission band associated with the optical signal.

19. The network element of claim 12, wherein the controller is further configured to:

compare the performance characteristic with a threshold value associated with the performance characteristic; and

determine that the optical signal needs regeneration based on the comparison between the performance characteristic and the threshold value.

20. The network element of claim 19, wherein the threshold value is based on a reach of the optical signal and an intended destination of the optical signal.

21. The network element of claim 12, wherein the OPM is configured to measure at least one of polarization mode dispersion (PMD) of the optical signal, an optical signal to noise ratio (OSNR) of the optical signal, phase noise of the optical signal, a bit error rate (BER) of the optical signal, an eye-opening associated with the optical signal, and chromatic dispersion of the optical signal.

22. The network element of claim 12, wherein the regeneration unit is configured to perform optical signal regeneration in the optical domain.