Method and apparatus for providing passive optical networks with extended reach and/or split

• US 8,699,881 B1
• Filed: 11/28/2006
• Issued: 04/15/2014
• Est. Priority Date: 11/28/2006
• Status: Active Grant

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Iannone, Patrick Paul, Lee, Han Hyub, Reichmann, Kenneth Charles, Zhou, Xiang
• Primary Examiner(s): DOBSON, DANIEL G
• Application Number:
  US11/564,237
• Time in Patent Office: 2,695 Days
• Field of Search: 398/66, 398/67, 398/68, 398/70, 398/71, 398/72, 398/98, 398/99, 398/100, 398/101, 398/173, 398/175, 398/180
• US Class Current: 398/68
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04J 14/0282 WDM tree architectures

Abstract

A method and apparatus for providing passive optical networks with extended reach and/or splitting ratio are disclosed. For example, the optical network comprises a first optical line termination (OLT) device having a transceiver for sending and receiving optical signals. The optical network further comprises an optical extender box comprising at least one hybrid SOA-Raman amplifier, wherein the optical extender box is coupled to the first optical line termination device via a first standard single mode fiber section. Finally, the optical network further comprises an optical splitter coupled to the optical extender box via a second standard single mode fiber section.

Claims

1. An optical network, comprising:

a first optical line termination device having a transceiver for sending an optical signal at a first wavelength and receiving an optical signal at a second wavelength, wherein the first wavelength and the second wavelength are different;

an optical extender box comprising a first wavelength diplexer and a second wavelength diplexer, wherein the first wavelength diplexer and the second wavelength diplexer are both coupled to a first portion and a second portion, wherein the first portion is for transporting the first optical signal at the first wavelength and the second portion is for transporting the second optical signal at the second wavelength, wherein the first portion in an upstream direction comprises an upstream semiconductor amplifier, which is connected to an upstream isolator, which is connected to an upstream non-linear fiber, which is connected to an upstream pump laser, wherein the second portion in a downstream direction comprises a downstream semiconductor amplifier, which is connected to a downstream isolator, which is connected to a downstream non-linear fiber, which is connected to a downstream pump laser, wherein the optical extender box is coupled to the first optical line termination device via a first standard single mode fiber section; and

an optical splitter coupled to the optical extender box via a second standard single mode fiber section.

2. The optical network of claim 1, wherein the optical splitter is a passive optical splitter.

3. The optical network of claim 1, wherein the optical extender box extends a sum of the first standard single mode fiber section and the second standard single mode fiber section to be greater than 20 kilometers (km).

4. The optical network of claim 3, wherein the optical extender box extends the sum of the first standard single mode fiber section and the second standard single mode fiber section to be within a range of 20 km to 60 km.

5. The optical network of claim 1, wherein the optical extender box extends a splitting ratio of the optical splitter to greater than 1:

32.

6. The optical network of claim 5, wherein the optical extender box extends the splitting ratio of the optical splitter to be at least 1:

64.

7. The optical network of claim 1, wherein the optical splitter is coupled to a plurality of optical network termination devices.

8. The optical network of claim 1, further comprising:

an enhancement optical line termination device; and

a wave division multiplexer combiner for combining optical signals received from the enhancement optical line termination device and the first optical line termination device, wherein the wave division multiplexer combiner is deployed between the optical extender box and the enhancement optical line termination device and the first optical line termination device.

9. The optical network of claim 8, wherein the first optical line termination device having a downstream transmission band of 1480 nm-1500 nm, and the enhancement optical line termination device having a downstream transmission band of 1500 nm-1580 nm.

10. The optical network of claim 9, wherein the optical splitter is coupled to a plurality of optical network termination devices, and wherein one of the plurality of optical network termination devices comprises a wave division multiplexer splitter for separating the combined optical signals received from the optical splitter.

11. An optical network, comprising:

a first optical line terminating means having a transceiver for sending an optical signal at a first wavelength and receiving an optical signal at a second wavelength, wherein the first wavelength and the second wavelength are different;

an optical extending means comprising a first wavelength diplexer and a second wavelength diplexer, wherein the first wavelength diplexer and the second wavelength diplexer are both coupled to a first portion and a second portion, wherein the first portion is for transporting the first optical signal at the first wavelength and the second portion is for transporting the second optical signal at the second wavelength, wherein the first portion in an upstream direction comprises an upstream semiconductor amplifier, which is connected to an upstream isolator, which is connected to an upstream non-linear fiber, which is connected to an upstream pump laser, wherein the second portion in a downstream direction comprises a downstream semiconductor amplifier, which is connected to a downstream isolator, which is connected to a downstream non-linear fiber, which is connected to a downstream pump laser, wherein the optical extending means is coupled to the first optical line terminating means via a first standard single mode fiber section; and

an optical splitting means coupled to the optical extending means via a second standard single mode fiber section.

12. The optical network of claim 11, wherein the optical splitting means is a passive optical splitter.

13. The optical network of claim 11, wherein the optical extending means extends a sum of the first standard single mode fiber section and the second standard single mode fiber section to be greater than 20 kilometers (km).

14. The optical network of claim 13, wherein the optical extending means extends the sum of the first standard single mode fiber section and the second standard single mode fiber section to be within a range of 20 km to 60 km.

15. The optical network of claim 11, wherein the optical extending means extends a splitting ratio of the optical splitter to greater than 1:

32.

16. The optical network of claim 15, wherein the optical extending means extends the splitting ratio of the optical splitter to be at least 1:

64.

17. The optical network of claim 11, wherein the optical splitting means is coupled to a plurality of optical network termination devices.

18. The optical network of claim 11, further comprising:

an enhancement optical line terminating means; and

a wave division multiplexer combining means for combining optical signals received from the enhancement optical line terminating means and the first optical line terminating means, wherein the wave division multiplexer combining means is deployed between the optical extending means and the enhancement optical line terminating means and the first optical line terminating means.

19. The optical network of claim 18, wherein the first optical line terminating means having a downstream transmission band of 1480 nm-1500 nm, and the enhancement optical line terminating means having a downstream transmission band of 1500 nm-1580 nm.

20. A method comprising:

providing a first optical line termination device having a transceiver for sending an optical signal at a first wavelength and receiving an optical signal at a second wavelength, wherein the first wavelength and the second wavelength are different;

providing an optical extender box comprising a first wavelength diplexer and a second wavelength diplexer, wherein the first wavelength diplexer and the second wavelength diplexer are both coupled to a first portion and a second portion, wherein the first portion is for transporting the first optical signal at the first wavelength and the second portion is for transporting the second optical signal at the second wavelength, wherein the first portion in an upstream direction comprises an upstream semiconductor amplifier, which is connected to an upstream isolator, which is connected to an upstream non-linear fiber, which is connected to an upstream pump laser, wherein the second portion in a downstream direction comprises a downstream semiconductor amplifier, which is connected to a downstream isolator, which is connected to a downstream non-linear fiber, which is connected to a downstream pump laser, wherein the optical extender box is coupled to the first optical line termination device via a first standard single mode fiber section; and

providing an optical splitter coupled to the optical extender box via a second standard single mode fiber section.