Optical transmission device, optical transmission method and optical transmission system

Patent metadata

Field	Value
Publication number	US-10659184-B2
Application number	US-201816225593-A
Country	US
Kind code	B2
Filing date	Dec 19, 2018
Priority date	Jan 31, 2018
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

An optical transmission device that is provided at a first site includes: an optical transmitter that transmits a first optical signal that includes first ID information to a second site using a first wavelength; and an optical receiver that receives a second optical signal that includes second ID information and that is transmitted using the first wavelength from the second site. When the first ID information matches the second ID information, the optical transmitter transmits a wavelength report that indicates a second wavelength to the second site using the first wavelength. When the optical receiver receives a completion report that indicates the wavelength report has been received at the second site, the optical transmitter transmits an optical signal to the second site using the second wavelength, and the optical receiver ceases to receive an optical signal of the first wavelength from the second site.

First claim

What is claimed is:

1. An optical transmission device that is provided at a first site in an optical transmission system that transmits a wavelength division multiplexed optical signal between the first site and a second site, the optical transmission device comprising:
an optical transmitter configured to transmit a first optical signal that includes first ID information to the second site using a first wavelength; and
an optical receiver configured to receive a second optical signal that includes second ID information and that is transmitted using the first wavelength from the second site, wherein
the optical receiver detects one or more unused wavelengths that have not been used in the optical transmission system,
the optical receiver obtains information that indicates one or more unused wavelengths detected in the second site,
when the first ID information matches the second ID information extracted from the second optical signal, the optical transmission device selects a second wavelength from among common wavelengths included in both of the one or more unused wavelengths detected by the optical receiver and the one or more unused wavelengths detected in the second site, and the optical transmitter transmits a wavelength report that indicates the second wavelength to the second site using the first wavelength, and
when the optical receiver receives a completion report that indicates the wavelength report has been received at the second site, the completion report being transmitted using the first wavelength, the optical transmitter transmits an optical signal to the second site using the second wavelength, and the optical receiver ceases to receive an optical signal of the first wavelength from the second site.

2. The optical transmission device according to claim 1 , further comprising:
an obtaining unit configured to obtain the first ID information from an input signal; and
a controller configured to control a communication between the optical transmission device and a correspondent optical transmission device provided at the second site, wherein
the controller
determines which of the optical transmission device or the correspondent optical transmission device is to be operated as a master device when the first ID information matches the second ID information,
detects wavelengths that have been unused in the optical transmission system, and
determines the second wavelength according to the unused wavelengths detected by the controller and unused wavelengths detected by the correspondent optical transmission device when the optical transmission device is operated as a master device.

3. The optical transmission device according to claim 2 , wherein
the obtaining unit obtains information for identifying a source of the input signal or a portion of the information as the first ID information.

4. The optical transmission device according to claim 3 , wherein
the input signal is a packet for neighbor discover or neighbor check that is transmitted from a router, and
the obtaining unit obtains, as the first ID information, a value of a network address section of an address for identifying the router from the packet.

5. The optical transmission device according to claim 2 , wherein
the controller transmits a wavelength report indicating the second wavelength to the correspondent optical transmission device.

6. The optical transmission device according to claim 2 , wherein
the optical transmitter includes a wavelength tunable light source,
the optical receiver includes a wavelength tunable local light source, and
the controller controls the wavelength tunable light source such that the optical transmitter transmits an optical signal of the second wavelength and controls the wavelength tunable local light source such that the optical receiver coherently receives an optical signal of the second wavelength.

7. The optical transmission device according to claim 2 , wherein
the optical transmitter includes a wavelength tunable light source,
the optical receiver includes a variable band pass filter, and
the controller controls the wavelength tunable light source such that the optical transmitter transmits an optical signal of the second wavelength and controls the variable band pass filter such that the optical receiver receives an optical signal of the second wavelength.

8. An optical transmission method used by an optical transmission device that is provided at a first site in an optical transmission system that transmits a wavelength division multiplexed optical signal between the first site and a second site, the optical transmission method comprising:
transmitting a first optical signal that includes first ID information to the second site using a first wavelength;
receiving a second optical signal that includes second ID information and that is transmitted using the first wavelength from the second site;
detecting one or more unused wavelengths that have not been used in the optical transmission system; and
obtaining information that indicates one or more unused wavelengths detected in the second site, wherein
when the first ID information matches the second ID information extracted from the second optical signal, a second wavelength is selected from among common wavelengths included in both of the one or more unused wavelengths detected in the optical transmission device and the one or more unused wavelengths detected in the second site, and a wavelength report that indicates the second wavelength is transmitted to the second site using the first wavelength, and
when a completion report that indicates that the wavelength report has been received at the second site is received, the completion report being transmitted using the first wavelength, an optical signal is transmitted to the second site using the second wavelength, and a reception of an optical signal of the first wavelength from the second site is ceased.

9. An optical transmission system that transmits a wavelength division multiplexed optical signal between a first site at which a plurality of optical transmission devices are provided and a second site at which a plurality of optical transmission devices are provided, wherein
a first optical transmission device of the plurality of optical transmission devices provided at the first site transmits a first optical signal that includes first ID information to the second site using a first wavelength,
a second optical transmission device of the plurality of optical transmission devices provided at the second site transmits a second optical signal that includes second ID information to the first site using the first wavelength,
the first optical transmission device detects one or more unused wavelengths that have not been used in the optical transmission system and transmits information that indicates the detected one or more unused wavelengths to the second optical transmission device,
the second optical transmission device detects one or more unused wavelengths that have not been used in the optical transmission system and transmits information that indicates the detected one or more unused wavelengths to the first optical transmission device,
when the first ID information matches the second ID information, the first optical transmission device selects a second wavelength from among common wavelengths included in both of the one or more unused wavelengths detected by the first optical transmission device and the one or more unused wavelengths detected by the second optical transmission device, and the first optical transmission device transmits a wavelength report that indicates the second wavelength to the second site using the first wavelength,
when the second optical transmission device re

Assignees

• Fujitsu Ltd

Inventors

• Tajima Kazuyuki
• Takita Yutaka
• Miyabe Masatake

Classifications

• H04J14/0273

  using optical overhead, e.g. overhead processing · CPC title

• H04J14/0257

  Wavelength assignment algorithms · CPC title

• H04J14/0241

  Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths · CPC title

• H04J14/0267 Primary

  Optical signaling or routing · CPC title

• H04B10/572

  Wavelength control · CPC title