Span-wise spectrum management system and method

Patent metadata

Field	Value
Publication number	US-2016105252-A1
Application number	US-201514854853-A
Country	US
Kind code	A1
Filing date	Sep 15, 2015
Priority date	Oct 13, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

Methods and systems are provided for optical signal transmission using span-wise spectrum management. The method includes transmitting a first optical signal at a first wavelength by a control system. The first optical signal has a first optical path distance. The method further includes determining a first guard band requirement for the first optical signal, and transmitting a second optical signal by the control system. The second optical signal has a second optical path distance. The method includes determining a second guard band requirement for the second optical signal, and placing the second optical signal spectrally adjacent to the first optical signal by selecting a second wavelength. The second wavelength is selected to satisfy the first and second guard band requirements.

First claim

What is claimed is:

1 . A method for optical signal transmission comprising:
transmitting a first optical signal at a first wavelength by a control system, the first optical signal having a first optical path distance; determining a first guard band requirement for the first optical signal; transmitting a second optical signal by the control system, the second optical signal having a second optical path distance; determining a second guard band requirement for the second optical signal; and placing the second optical signal spectrally adjacent to the first optical signal by selecting a second wavelength, the second wavelength selected to satisfy the first and second guard band requirements.

2 . The method of claim 1 , wherein the first guard band requirement is satisfied by allocating a plurality of first guard bands in a plurality of optical spans.

3 . The method of claim 2 , wherein the plurality of first guard bands include a particular guard band with a different length than another guard band.

4 . The method of claim 2 , wherein the plurality of first guard bands include a particular guard band with a different width than another guard band.

5 . The method of claim 2 , wherein the plurality of first guard bands include a first fixed-width guard band and a second fixed-width guard band.

6 . The method of claim 1 , wherein placing the second optical signal includes placing the second optical signal in a plurality of optical spans.

7 . The method of claim 1 , further comprising calculating a remaining first optical path distance without a guard band.

8 . The method of claim 7 , wherein calculating the remaining first optical path distance without a guard band is based on including two sides of the first optical signal.

9 . The method of claim 7 , wherein determining the first guard band requirement includes applying a percentage to the first optical path distance, the percentage based on the first optical path distance without a guard band, and the first guard band requirement is further based on a portion of the first optical path length that is greater than a threshold length.

10 . The method of claim 9 , wherein the percentage is applied in increments of one percent.

11 . The method of claim 9 , wherein applying the percentage is based on a first-fit method.

12 . The method of claim 1 , further comprising placing a first guard band based on the first guard band requirement.

13 . The method of claim 12 , further comprising placing a second guard band based on the second guard band requirement.

14 . A network element comprising:
a processor configured to:
receive a first optical signal at a first wavelength, the first optical signal having a first optical path distance;
determine a first guard band requirement for the first optical signal;
receive a second optical signal having a second optical path distance;
determine a second guard band requirement for the second optical signal; and
place the second optical signal spectrally adjacent to the first optical signal by selecting a second wavelength, the second wavelength selected to satisfy the first and second guard band requirements.

15 . The network element of claim 14 , wherein the first guard band requirement is satisfied by allocating a plurality of first guard bands in a plurality of optical spans.

16 . The network element of claim 15 , wherein the plurality of first guard bands include a particular guard band with a different length than another guard band.

17 . The network element of claim 15 , wherein the plurality of first guard bands include a particular guard band with a different width than another guard band.

18 . The network element of claim 15 , wherein the plurality of first guard bands include a first fixed-width guard band and a second fixed-width guard band.

19 . The network element of claim 14 , wherein placing the second optical signal includes placing the second optical signal in a plurality of optical spans.

20 . The network element of claim 14 , wherein the processor is further configured to calculate a remaining first optical path distance without a guard band.

Assignees

• Fujitsu Ltd

Inventors

• Bouda Martin
• Palacharla Paparao
• Sekiya Motoyoshi

Classifications

• H04J14/0257

  Wavelength assignment algorithms · CPC title

• H04J14/0224 Primary

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

• H04J14/0226

  Fixed carrier allocation, e.g. according to service · CPC title

• H04Q2011/0086

  Network resource allocation, dimensioning or optimisation · CPC title

• H04Q11/0066

  Provisions for optical burst or packet networks · CPC title