Optical transmission system and optical transmission method

Patent metadata

Field	Value
Publication number	US-11696056-B2
Application number	US-202017433120-A
Country	US
Kind code	B2
Filing date	Feb 13, 2020
Priority date	Feb 26, 2019
Publication date	Jul 4, 2023
Grant date	Jul 4, 2023

Abstract

[Problem] whether optical input interruption detected by an OXC device is due to an external failure from an upstream side or an internal failure of the OXC device in a transponder device connected to the OXC device using an optical transmission line, and this determination is implemented at low cost.[Solution] An optical transmission system (10A) is configured by connecting a plurality of OXC devices (14A) using optical fibers (16) between transponder devices (15A1) that relay optical signals transmitted to/from terminals (19a, 19b). The OXC device (14A) includes an OSC part (4d1) and a monitoring control part (4e1). The OSC part (4d1) outputs wavelength information on an optical signal in which optical input interruption has occurred and path information on a path of an optical fiber (16) in which the optical input interruption has occurred, at the time of detecting the optical input interruption from the optical fiber (16). In accordance with the wavelength information and the path information that have been output as above, the OXC device (14A) includes an AIS generation part (4j) that generates an AIS signal including both pieces of information on the wavelength and the path of the optical signal relating to the optical input interruption and alarm information relating to both the pieces of information.

First claim

The invention claimed is:

1. An optical transmission system configured to connect, using an optical transmission line, and aggregate a plurality of optical cross connect (OXC) devices that switches wavelength paths of optical signals between a plurality of transponder devices that relay optical signals transmitted to and from a communication device,
wherein an OXC device of the plurality of OXC devices includes:
a first control part, when optical input interruption in which an optical signal input from the optical transmission line is interrupted is detected, configured to output wavelength information indicating a wavelength of the optical signal in which the optical input interruption has occurred, and path information on a path of the optical transmission line in which the optical input interruption has occurred;
a generation part configured to generate an alarm signal in accordance with the output wavelength information and the output path information from the first control part, the alarm signal including both pieces of information on the wavelength and the path of the optical signal relating to the optical input interruption and alarm information relating to the both pieces of information; and
a first database (DB);

and wherein a transponder device of the plurality of transponder devices includes:
a second DB storing information on a path number that is a number of a path of the optical transmission line, information on an accommodation wavelength that is a wavelength of an optical signal accommodated in the path, information on device identifications (IDs) that are unique information of a transmitting device and a destination device of a signal, and information on a transponder ID, and wherein each piece of information stored in the second DB of the transponder device is registered and stored in the first DB of the OXC device; and
a second control part configured to notify of an external failure of the transponder device based on the both pieces of information and the alarm information included in the generated alarm signal;

the transponder device is configured to:
determine recovery from the optical input interruption when a state is changed from a state of being unconnected to the OXC device to a state of being connected to the OXC device through the optical transmission line,
after this determination, superimpose each piece of the information read from the second DB on a control signal that has been changed to have a unique specific wavelength, and
transmit a resultant control signal to the OXC device; and

the OXC device is configured to:
receive the transmitted control signal,
register the received control signal, and
store the information superimposed on the received control signal in the first DB in accordance with control of the second control part.

2. The optical transmission system according to claim 1 , comprising:
an optical coupler disposed in an optical transmission line coupling the OXC device and the transponder device, and
the OXC device is configured to transmit the generated alarm signal to the transponder device through the optical coupler.

3. An optical transmission method of an optical transmission system that is configured to connect, using an optical transmission line, and aggregate a plurality of optical cross connect (OXC) devices that switches wavelength paths of optical signals between a plurality of transponder devices that relay optical signals transmitted to and from a communication device, the optical transmission method comprising:
when optical input interruption in which an optical signal input from the optical transmission line is interrupted is detected, outputting, by an OXC device, wavelength information indicating a wavelength of the optical signal in which the optical input interruption has occurred, and path information on a path of the optical transmission line in which the optical input interruption has occurred, wherein the OXC device includes a first DB in which each piece of information stored in a second DB of one of the plurality of transponder devices is registered and stored, and
generating, by the OXC device, an alarm signal in accordance with the output wavelength information and the output path information, the alarm signal including both pieces of information on the wavelength and the path of the optical signal relating to the optical input interruption and alarm information relating to the both pieces of information; and
notifying, by a transponder device of the plurality of transponder devices, of an external failure of the transponder device based on the both pieces of information and the alarm information included in the generated alarm signal, wherein the transponder device includes the second DB storing information on a path number that is a number of a path of the optical transmission line, information on an accommodation wavelength that is a wavelength of an optical signal accommodated in the path, information on device identifications (IDs) that are unique information of a transmitting device and a destination device of a signal, and information on a transponder ID;
determining, by the transponder device, recovery from the optical input interruption when a state is changed from a state of being unconnected to the OXC device to a state of being connected to the OXC device through the optical transmission line;
after this determination, superimposing, by the transponder device, each piece of the information read from the second DB on a control signal that has been changed to have a unique specific wavelength;
transmitting, by the transponder device, a resultant control signal to the OXC device;
receiving, by the OXC device, the transmitted control signal;
registering, by the OXC device, the received control signal; and
storing, by the OXC device, the information superimposed on the received control signal in the first DB in accordance with control of the second control part.

4. The optical transmission method according to claim 3 ,
wherein an optical coupler is inserted into an optical transmission line coupling the OXC device and the transponder device, and
transmitting, by the OXC device, the generated alarm signal to the transponder device through the optical coupler.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Takechi Hiroto
• Araya Katsuhiro
• Namiki Masatoshi
• Kawahara Hiroki
• Seki Takeshi

Classifications

• H04Q11/0005 Primary

  Switch and router aspects · CPC title

• H04B10/079

  using measurements of the data signal · CPC title

• H04J14/0275 Primary

  using an optical service channel · CPC title

• H04B10/27

  Arrangements for networking · CPC title

• H04B10/077

  using a supervisory or additional signal · CPC title