Parameter control for optical multicarrier signal

Patent metadata

Field	Value
Publication number	US-2016164626-A1
Application number	US-201314909079-A
Country	US
Kind code	A1
Filing date	Aug 1, 2013
Priority date	Aug 1, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

An optical multi carrier signal has a modulation format and has many individual carrier signals. Parameters of the signal are controlled by receiving an indication of individual carrier transmission performance of the individual carrier signals, and selecting parameter values for the individual carrier signals, the parameter values comprising both a carrier FEC overhead and a carrier bandwidth for the modulation format. Selection is made according to the indicated individual carrier transmission performance and according to an overall spectral efficiency of the multi carrier signal. The selected parameter values are output for control of the optical multi carrier signal. By selecting values for both parameters rather than either one, better optimisation can be obtained since they are interdependent. The control can have better granularity than changing modulation format, and can make better use of bandwidth or improve the overall capacity.

First claim

1 : Apparatus for controlling parameters of an optical multi carrier signal having a modulation format and comprising a plurality of individual carrier signals, the apparatus having:
an input for receiving an indication of individual carrier transmission performance of at least one of the individual carrier signals; a processor for selecting parameter values for said at least one of the individual carrier signals, the parameter values comprising both a carrier Forward Error Correction (FEC) overhead and a carrier bandwidth for the modulation format, according to the indicated individual carrier transmission performance and according to a resulting overall spectral efficiency of the optical multi carrier signal; and an output for outputting the said selected parameter values for control of the optical multi carrier signal.

2 : The apparatus of claim 1 , the processor being configured to select carrier bandwidth for said at least one of the carriers of the multi carrier signal to provide faster than Nyquist operation.

3 : The apparatus of claim 1 , the processor being configured to select a carrier spacing according to the indicated individual carrier transmission performance and according to the resulting overall spectral efficiency of the optical multi carrier signal.

4 : The apparatus of claim 1 , the processor being configured to receive an indication of a desired total bandwidth limit for the multi carrier signal, and to make the selections of carrier FEC overhead and carrier bandwidth according to that total bandwidth limit.

5 : The apparatus of claim 1 , the processor being configured to receive an indication of a desired total transmission capacity for the multi carrier signal and to make the selections of carrier FEC overhead and the carrier bandwidth according to that total transmission capacity.

6 : The apparatus of claim 1 , the processor also being configured to control a mapper, to adapt a mapping of payload onto different ones of the carriers according to the selected parameter values.

7 : The apparatus of claim 1 , having a look up table having possible values of carrier FEC overhead as a function of possible values of corresponding carrier bandwidth and the indicated corresponding carrier transmission performance, and having possible values of corresponding carrier bandwidth as a function of possible values of carrier FEC overhead and the indicated corresponding carrier transmission performance.

8 : The apparatus of claim 7 , the processor being configured to determine an overall spectral efficiency achieved by respective different combinations of possible values of carrier FEC overhead and corresponding carrier bandwidth from the look up table, and configured to make the selections of carrier FEC overhead and carrier bandwidth by selecting from the different combinations according to the determined overall spectral efficiencies.

9 : The apparatus of claim 1 , the processor being configured to update the selection of parameter values periodically.

10 : A network management system having the apparatus of claim 1 .

11 : A method of controlling parameters of an optical multi carrier signal having a modulation format and comprising a plurality of individual carrier signals, the method having the steps of:
receiving an indication of individual carrier transmission performance of at least one of the individual carrier signals; selecting parameter values for said at least one of the individual carrier signals, the parameter values comprising both a carrier FEC overhead and a carrier bandwidth for the modulation format, according to the indicated individual carrier transmission performance and according to an overall spectral efficiency of the multi carrier signal; and outputting the said selected parameter values for control of the optical multi carrier signal.

12 : The method of claim 11 , the carrier bandwidth being selected to provide faster than Nyquist operation.

13 : The method of claim 11 , having the step of selecting a carrier spacing according to the indicated individual carrier transmission performance and according to the resulting overall spectral efficiency of the optical multi carrier signal.

14 : The method of claim 11 , having the step of receiving an indication of a desired total bandwidth limit for the multi carrier signal, and the selecting step being carried out according to that total bandwidth limit.

15 : The method of claim 11 , having the step of receiving an indication of a desired total transmission capacity for the multi carrier signal and the selecting step being carried out according to that total transmission capacity.

16 : The method of claim 11 , having a step of adapting a mapping of payload onto different ones of the carriers according to the selected parameter values.

17 : The method of claim 11 , having steps of using a look up table to determine possible values of carrier FEC overhead as a function of possible values of corresponding carrier bandwidth and the indicated corresponding carrier transmission performance, and to determine possible values of corresponding carrier bandwidth as a function of possible values of carrier FEC overhead and the indicated corresponding carrier transmission performance.

18 : The method of claim 17 having the step of determining an overall spectral efficiency achieved by respective different combinations of possible values of carrier FEC overhead and corresponding carrier bandwidth, and making the selections by selecting from the different combinations according to their respective overall spectral efficiencies.

19 : The method of claim 11 , having the step of updating the selection of parameter values periodically.

20 : A nontransitory computer readable medium comprising instructions which, when executed by a processor, cause the processor to carry out a method of controlling parameters of an optical multi carrier signal having a modulation format and comprising a plurality of individual carrier signals, the method having the steps of:
receiving an indication of individual carrier transmission performance of at least one of the individual carrier signals; selecting parameter values for said at least one of the individual carrier signals, the parameter values comprising both a carrier FEC overhead and a carrier bandwidth for the modulation format, according to the indicated individual carrier transmission performance and according to an overall spectral efficiency of the multi carrier signal; and outputting the said selected parameter values for control of the optical multi carrier signal.

Assignees

• Ericsson Telefon Ab L M

Inventors

• Cavaliere Fabio
• Magri Roberto
• Nibbs Philip

Classifications

• H04L1/0009

  by adapting the channel coding (H04L1/1812 takes precedence) · CPC title

• H04B10/516

  Details of coding or modulation · CPC title

• H04L1/0006 Primary

  by adapting the transmission format · CPC title