Optical transmission device that transmits wavelength division multiplexed optical signal and optical transmission system

Patent metadata

Field	Value
Publication number	US-2016315729-A1
Application number	US-201615062726-A
Country	US
Kind code	A1
Filing date	Mar 7, 2016
Priority date	Apr 23, 2015
Publication date	Oct 27, 2016
Grant date	—

Abstract

An optical transmission device includes: a wavelength allocation detector configured to detect wavelength allocation that indicates allocation of optical signals multiplexed in a WDM optical signal; a power adjusting unit configured to adjust powers of the optical signals multiplexed in the WDM optical signal; an optical amplifier configured to amplify the WDM optical signal output from the power adjusting unit; a power controller configured to generate a power control signal to control the power adjusting unit such that the WDM optical signal has a specified wavelength characteristic; and a correction value generator configured to generate a correction value to correct the power control signal based on the wavelength allocation. The power controller corrects the power control signal with the correction value. The power adjusting unit adjusts powers of the optical signals multiplexed in the WDM optical signal according to the corrected power control signal.

First claim

What is claimed is:

1 . An optical transmission system that includes a first optical transmission device and a second optical transmission device that receives a WDM (wavelength division multiplexed) optical signal transmitted from the first optical transmission device, the optical transmission system comprising:
a wavelength allocation detector that is implemented in the first optical transmission device or the second optical transmission device and configured to detect wavelength allocation indicating allocation of optical signals multiplexed in the WDM optical signal; a power adjusting unit that is implemented in the first optical transmission device and configured to adjust powers of the plurality of optical signals multiplexed in the WDM optical signal; an optical amplifier that is implemented in the first optical transmission device and configured to amplify the WDM optical signal output from the power adjusting unit; a power controller configured to generate a power control signal to control the power adjusting unit such that the WDM optical signal has a specified wavelength characteristic; and a correction value generator configured to generate a correction value to correct the power control signal based on the wavelength allocation, wherein the power controller corrects the power control signal with the correction value, and the power adjusting unit adjusts powers of the optical signals multiplexed in the WDM optical signal according to the corrected power control signal.

2 . The optical transmission system according to claim 1 , wherein
the power controller is implemented in the first optical transmission device, the wavelength allocation detector and the correction value generator are implemented in the second optical transmission device, and the power controller receives the correction value from the second optical transmission device and corrects the power control signal with the received correction value.

3 . The optical transmission system according to claim 2 , wherein
the second optical transmission device includes an optical pre-amplifier that amplifies the WDM optical signal received from the first optical transmission device, and the wavelength allocation detector detects wavelength allocation of the WDM optical signal amplified by the optical pre-amplifier.

4 . An optical transmission device comprising:
a wavelength allocation detector configured to detect wavelength allocation that indicates allocation of optical signals multiplexed in a WDM (wavelength division multiplexed) optical signal; a power adjusting unit configured to adjust powers of the optical signals multiplexed in the WDM optical signal; an optical amplifier configured to amplify the WDM optical signal output from the power adjusting unit; a power controller configured to generate a power control signal to control the power adjusting unit such that the WDM optical signal has a specified wavelength characteristic; and a correction value generator configured to generate a correction value to correct the power control signal based on the wavelength allocation, wherein the power controller corrects the power control signal with the correction value, and the power adjusting unit adjusts powers of the optical signals multiplexed in the WDM optical signal according to the corrected power control signal.

5 . The optical transmission device according to claim 4 , further comprising
a power density calculator configured to calculate, based on the wavelength allocation, power density at a wavelength in which respective optical signals multiplexed in the WDM optical signal are allocated, wherein the correction value generator generates the correction value based on the power density.

6 . The optical transmission device according to claim 5 , wherein
the power density calculator calculates the power density based on an spacing to a next optical signal for respective optical signals multiplexed in the WDM optical signal.

7 . The optical transmission device according to claim 5 , wherein
the correction value generator generates a correction value that increases a power of an optical signal allocated in a wavelength region with low power density, relative to a power of an optical signal allocated in a wavelength region with high power density.

8 . The optical transmission device according to claim 5 , further comprising
a memory configured to store information representing a correspondence between the power density and the correction value, wherein the power density calculator calculates power density for respective optical signals multiplexed in the WDM optical signal, and the correction value generator generates the correction value corresponding to the power density by referring to information stored in the memory for respective optical signals multiplexed in the WDM optical signal.

Assignees

• Fujitsu Ltd

Inventors

• Tsuzuki Tatsuya

Classifications

• H04J14/0221 Primary

  Power control, e.g. to keep the total optical power constant · CPC title

• H04B10/572

  Wavelength control · CPC title

• H04B10/564

  Power control · CPC title

• H04B10/07955 Primary

  Monitoring or measuring power · CPC title

• H04J14/02216

  by gain equalization · CPC title