Simplified signal regenerator structure

• US 20060127100A1
• Filed: 03/28/2005
• Published: 06/15/2006
• Est. Priority Date: 12/10/2004
• Status: Abandoned Application

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Frankel, Michael Y., Livas, Jeffery C.
• Application Number:
  US11/090,047
• Publication Number:
  US 20060127100A1
• Time in Patent Office: Days
• US Class Current: 398/158
• CPC Class Codes: H04B 10/29 Repeaters

Abstract

Systems and methods for reconditioning an optical signal by OE (optical-to-electrical) converting the signal, recovering clock and data information and performing 3R reconditioning to reamplify, retime and reshape the converted electrical signal, and EO converting the signal back to the optical domain while the FEC and/or Framing encoding of the optical signal remains intact. An exemplary apparatus may be configured to include a receiver 302 with an optical-to-electrical converter, an electronic distortion estimation and compensation unit 304, an electrical-to-optical converter 308, and a transmitter 310.

Claims

1. An apparatus for compensating an optical signal, the apparatus comprising:

a receiver being configured to receive an optical signal;

an optical-to-electrical converter being coupled to the receiver and being configured to convert the optical signal into an electrical signal;

a compensator being coupled to the optical-to-electrical converter and being configured to compensate the electrical signal;

an electrical-to-optical converter being directly coupled to the compensator and being configured to convert the compensated electrical signal to a compensated optical signal; and

a transmitter being coupled to the electrical-to-optical converter and being configured to transmit the compensated optical signal.

2. The apparatus of claim 1, further comprising a clock and data recovery unit.

3. The apparatus of claim 1, wherein the clock and data recovery unit is configured as part of the compensator;

and

wherein the compensator is configured to perform distortion estimation on the optical signal.

4. The apparatus of claim 2, wherein the compensator is configured to reamplify, retime and reshape the electrical signal.

5. The apparatus of claim 1, wherein the compensator is configured to perform adaptive filtering.

6. The apparatus of claim 1, wherein the optical-to-electrical converter is configured as part of the receiver.

7. The apparatus of claim 1, wherein the apparatus is protocol transparent.

8. The apparatus of claim 1, wherein the apparatus is bit-rate transparent over a predefined frequency range.

9. The apparatus of claim 8, wherein the predefined frequency range comprises frequencies less than 15 gigabits/sec.

10. The apparatus of claim 1, wherein the optical signal is received via a first span of optical fiber from a first optical amplifier;

and

wherein the reconditioned optical signal is transmitted via a second span of optical fiber to a second optical amplifier.

11. The apparatus of claim 3, wherein the compensator is configured to provide a quality of signal (QOS) measurement.

12. A method of conditioning an optical signal comprising:

receiving the optical signal;

converting the optical signal to an electrical signal;

performing electronic distortion compensation on the electrical signal;

converting the electrical signal into a reconditioned optical signal; and

transmitting the reconditioned optical signal.

13. The method of claim 12, further comprising:

recovering clock and data information from the optical signal; and

performing distortion estimation on the optical signal.

14. The method of claim 13, further comprising:

reamplifying, retiming and reshaping the electrical signal as part of the performing electronic distortion compensation.

15. The method of claim 13, further comprising:

adaptively filtering the electrical signal as part of the performing electronic distortion compensation.

16. The method of claim 13, wherein the method is protocol transparent.

17. The method of claim 13, wherein the method is bit-rate transparent over a predefined frequency range.

18. The method of claim 17, wherein the predefined frequency range comprises frequencies less than 15 gigabits/sec.

19. The method of claim 12, further comprising:

receiving the optical signal via a first span of fiber optic cable from a first optical amplifier; and

transmitting the reconditioned optical signal via a second span of fiber optic cable to a second optical amplifier.

20. The method of claim 13, further comprising:

providing a quality of signal (QOS) measurement.

21. An apparatus for compensating an optical signal, the apparatus comprising:

a receiver being configured to receive a received optical signal encoded with a frame structure;

an optical-to-electrical converter being coupled to the receiver and being configured to convert the received optical signal into an electrical signal which remains encoded with said frame structure;

a compensator being coupled to the optical-to-electrical converter and being configured to compensate the electrical signal;

an electrical-to-optical converter being directly coupled to the compensator and being configured to convert the compensated electrical signal to a compensated optical signal which remains encoded with said frame structure; and

a transmitter being coupled to the electrical-to-optical converter and being configured to transmit the compensated optical signal which remains encoded with said frame structure.