Optical transmission device, optical transmission system, and allocation method

Patent metadata

Field	Value
Publication number	US-10547390-B2
Application number	US-201815982164-A
Country	US
Kind code	B2
Filing date	May 17, 2018
Priority date	May 19, 2017
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

An optical transmission device includes: an optical transmitter that transmits, at a time of system activation, a control signal to another optical transmission device by using a plurality of subcarriers; and a controller that allocates a link communication channel (LCC) to a subcarrier, among the plurality of subcarriers, for which bare minimum transmission characteristic is obtained, based on a response to the control signal from the other optical transmission device.

First claim

What is claimed is:

1. An optical transmission device comprising:
an optical transmitter that transmits, at a time of system activation, a control signal to another optical transmission device by using a plurality of subcarriers; and
a controller that allocates a link communication channel (LCC) to a subcarrier which has a lowest transmission characteristic, among the plurality of subcarriers which have transmission characteristics above a predetermined reference, based on a response to the control signal from the other optical transmission device.

2. The optical transmission device according to claim 1 , wherein the controller includes
a transmission characteristic acquirer that performs negotiation with the other optical transmission device by using at least one subcarrier, among the plurality of subcarriers, for which a response to the control signal is received from the other optical transmission device, and that acquires a transmission characteristic of the at least one subcarrier for which the response is received, and
an LCC allocator that allocates the LCC to the subcarrier for which the lowest transmission characteristic is obtained, among the at least one subcarrier for which the response is received.

3. The optical transmission device according to claim 2 , wherein the LCC allocator
determines whether or not the transmission characteristic of the at least one subcarrier for which the response is received is above the predetermined reference, and
allocates the LCC to the subcarrier which has the lowest transmission characteristic, among subcarriers with the transmission characteristic above the predetermined reference.

4. The optical transmission device according to claim 1 , wherein
the controller includes
a frequency response characteristic calculator that calculates, by an arithmetic equation that uses a degree of modulation, a parameter of a frequency chirp of the optical transmitter, a wavelength of a modulated optical signal, a wavelength dispersion value, a transmission distance, a frequency, and a light speed, a frequency response characteristic representing a relationship between the frequency and a relative intensity of the modulated optical signal,
a dip frequency identifier that identifies a first dip frequency that is a lowest frequency at which a local minimum in the relative intensity occurs in the frequency response characteristic, and
a subcarrier selector that sequentially selects a subcarrier at an interval corresponding to the first dip frequency, from the plurality of subcarriers, and

the optical transmitter transmits the control signal for each subcarrier selected by the subcarrier selector.

5. An optical transmission system comprising first and second optical transmission devices, wherein
the first optical transmission device includes
an optical transmitter that transmits, at a time of system activation, a control signal to the second optical transmission device by using a plurality of subcarriers, and
a controller that allocates a link communication channel (LCC) to a subcarrier which has a lowest transmission characteristic, among the plurality of subcarriers which have transmission characteristics above a predetermined reference, based on a response to the control signal from the second optical transmission device.

6. An allocation method comprising:
transmitting, by an optical transmission device, at a time of system activation, a control signal to another optical transmission device by using a plurality of subcarriers; and
allocating, by the optical transmission device, a link communication channel (LCC) to a subcarrier which has a lowest transmission characteristic, among the plurality of subcarriers which have transmission characteristics above a predetermined reference, based on a response to the control signal from the other optical transmission device.

Assignees

• Fujitsu Ltd

Inventors

• Takahara Tomoo

Classifications

• H04B10/548 Primary

  Phase or frequency modulation · CPC title

• H04L27/2697

  in combination with other modulation techniques · CPC title

• H04B10/07953

  Monitoring or measuring OSNR, BER or Q · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04B10/2507

  for the reduction or elimination of distortion or dispersion · CPC title