Granted Patent B2

US 7,099,594 · App. 10/119,080 · Granted Aug 29, 2006

Abstract

Claims (33)

1. Apparatus, comprising:

at least one optical signal regenerator for receiving an optical signal via an optical signal communications medium; and

a dispersion module in series communication with the at least one optical signal regenerator for providing a regenerated optical signal.

wherein the at least one optical signal regenerator comprises:

a demultiplexer in series optical communication with an input to the at least one optical regenerator;

a pre-filter in series optical communication with an output of the demultiplexer;

an optical signal amplifier in series optical communication with an output of the pre-filter;

a nonlinear fiber device in series optical communication with an output of the optical signal amplifier; and

a shifted-filter in series optical communication with an output of the nonlinear fiber device.

2. The apparatus of claim 1 , wherein the nonlinear fiber device comprises a high nonlinear fiber device.

3. The apparatus of claim 1 , wherein the demultiplexer comprises a fourth Gaussian demultiplexer operating at about 80 GHz at about 3 dB.

4. The apparatus of claim 1 , wherein the pre-filter comprises a second Gaussian filter operating at about 120 GHz at about 3 dB.

5. The apparatus of claim 1 , wherein the optical signal amplifier comprises an erbium-doped fiber amplifier generating a power output of about 18 dBm.

6. The apparatus of claim 2 , wherein the high nonlinear fiber device comprises about a 4 km high non-linear fiber device.

7. The apparatus of claim 1 , wherein the shifter filter comprises a second Gaussian shifter filter operating at about 160 GHz at about 3 dB.

8. The apparatus of claim 1 , wherein the receiver comprises a fourth Bessel-type receiver configured to operate at about 24 GHz.

9. The apparatus of claim 1 , wherein the dispersion module comprises a length of dispersion compensation fiber, wherein the length is between about 100 meters and about 200 meters.

10. The apparatus of claim 1 , wherein the dispersion module is configured to generate negative lumped dispersion in the optical signal communications medium.

11. The apparatus of claim 10 , wherein the negative lumped dispersion is between about −8 ps/nm and about −15 ps/nm.

12. The apparatus of claim 10 , wherein the negative lumped dispersion is calculated to optimize a Q value of an optical pulse train.

13. A method for transmitting optical signals, comprising:

regenerating a received optical signal; and

adding negative lumped dispersion to the regenerated optical signal;

wherein regenerating the optical signal comprises:

receiving the optical signal in an all optical 2R optical regenerator;

demultiplexing the optical signal;

pre-filtering the optical signal;

amplifying the optical signal;

passing the optical signal through a nonlinear fiber; and

filtering the optical signal with a shifted-filter.

14. The method of claim 13 , wherein said nonlinear fiber comprises a high nonlinear fiber.

15. The method of claim 13 , wherein adding negative lumped dispersion comprises adding between about−8 ps/nm and about—15 ps/nm of lumped dispersion to the regenerated optical signal prior to the signal being received by the receiver.

16. The method of claim 13 , wherein adding the negative lumped dispersion operates to increase receiver tolerance to pulse distortion.

Assignments (9)