Optical switching device, optical add device, and optical drop device

• US 8,879,915 B2
• Filed: 08/22/2011
• Issued: 11/04/2014
• Est. Priority Date: 11/24/2010
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sakamoto, Takeshi, Takatsu, Kazuo
• Primary Examiner(s): Vanderpuye, Ken
• Assistant Examiner(s): LAMBERT, DAVID W
• Application Number:
  US13/137,501
• Publication Number:
  US 20120128347A1
• Time in Patent Office: 1,170 Days
• Field of Search: None
• US Class Current: 398/83
• CPC Class Codes: H04J 14/0204 Broadcast and select arrangements, e.g. with an optical splitter at the input before adding or dropping
• CPC Class Codes: H04J 14/0205 Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping
• CPC Class Codes: H04J 14/0209 Multi-stage arrangements, e.g. by cascading multiplexers or demultiplexers
• CPC Class Codes: H04J 14/021 Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
• CPC Class Codes: H04J 14/0212 using optical switches or wavelength selective switches [WSS]
• CPC Class Codes: H04J 14/0213 Groups of channels or wave bands arrangements
• CPC Class Codes: H04J 14/0217 Multi-degree architectures, e.g. having a connection degree greater than two
• CPC Class Codes: H04J 14/0219 Modular or upgradable architectures

Abstract

An optical switching device includes plural wavelength selective switches that respectively have a first port and a plurality of second ports; and an optical coupler that has a plurality of third ports on an input-side or an output-side, respectively optically coupled to the first ports of the wavelength selective switches.

Claims

1. An optical add device comprising:

a plurality of optical switching devices including;

a plurality of wavelength selective switches that respectively have a first port being an output port and a plurality of second ports being input ports,

an optical coupler that has a plurality of third ports on an input-side, respectively optically coupled with the first ports of the wavelength selective switches to couple optical signals output from output ports of the wavelength selective switches,

a wavelength monitor that monitors each wavelength included among optical signals,

a detector that detects, based on monitor results obtained by the wavelength monitor, optical signals which include a same wavelength, and

a controller that causes any one of the wavelength selective switches which output one of the detected optical signals to terminate output of the optical signal when an optical signal which includes the same wavelength is detected,

the plurality of the optical switching devices, respectively transmitting to degrees of a network, an optical signal coupled by the optical coupler;

a plurality of transmitters that respectively output an optical signal; and

optical paths that input to the input ports of the optical switching devices, the optical signals output by the transmitters and including;

a plurality of cross connects that each have a plurality of input ports to which the optical signals output by the transmitters are input, and a plurality of output ports,

a plurality of first switches that each have an input port that is optically coupled to an output port of one of the cross connects, and a plurality of output ports,

a plurality of second switches that each have input ports that are optically coupled to the output ports of the first switches, and an output port, and

a plurality of multiplexers that multiplex optical signals output from the output ports of the second switches and input the multiplexed optical signals to the input ports of the optical switching devices.

2. The optical add device according to claim 1, wherein

the optical paths include:

a plurality of second couplers that each have input ports that are optically coupled to the output ports of the switches, and an output port, and

the plurality of multiplexers multiplex the optical signals output from the output ports of the second couplers and input the multiplexed optical signals to the input ports of the optical switching devices.

3. The optical add device according to claim 1, wherein

the optical paths include:

a plurality of second couplers that each have an input port that is optically coupled to an output port of one of the cross connects, and a plurality of output ports, and

a plurality of switches that each have input ports that are optically coupled to the output ports of the second couplers, and an output port.

4. The optical add device according to claim 1, wherein

the optical paths include a plurality of second wavelength selective switches that have input ports and output ports that are respectively optically coupled, and that each have a plurality of input ports to which the optical signals output by the transmitters are input and output ports that are optically coupled to the input ports of the optical switching devices.

5. The optical add device according to claim 1, wherein

the optical paths include:

a plurality of multiplexers that multiplex the optical signals output by the transmitters,

a plurality of second couplers that split the optical signals multiplexed by the multiplexers, and

a plurality of second wavelength selective switches that each have a plurality of input ports to which the optical signals resulting from splitting by the second couplers are input, and an output port that is optically coupled to an input port of one of the optical switching devices.

6. The optical add device according to claim 1, wherein

the optical paths include:

a plurality of multiplexers that multiplex the optical signals output from the transmitters; and

a plurality of second wavelength selective switches that have input ports and output ports that are respectively optically coupled, a plurality of input ports to which a multiplexed optical signal is input from one of the multiplexers, and output ports that are optically coupled the input ports of the optical switching devices.

7. An optical drop device comprising:

a plurality of optical switching devices each including;

a plurality of wavelength selective switches that respectively have a first port being an input port and a plurality of second ports being output ports,

an optical coupler that has a plurality of third ports on an output-side, respectively optically coupled to the first ports of the wavelength selective switches, the optical coupler splits an optical signal into plural optical signals and outputs the optical signals to the input port of each wavelength selective switch, respectively,

a wavelength monitor that monitors each wavelength included among optical signals,

a detector that detects, based on monitor results obtained by the wavelength monitor, optical signals which include a same wavelength, and

a controller that causes any one of the wavelength selective switches which output one of the detected optical signals to terminate output of the optical signal when an optical signal which includes the same wavelength is detected,

the optical signals from degrees of a network are input to the optical couplers, respectively;

a plurality of receivers that receive the optical signals, respectively; and

a plurality of optical paths that output to the receivers, respectively, the optical signals output from the output ports of the wavelength selective switches, the plurality of optical paths including;

a plurality of demultiplexers that demultiplex the optical signals output from the optical switching devices,

a plurality of first switches that each have an input port to which an optical signal output from one of the demultiplexers is input and a plurality of output ports,

a plurality of second switches that each include a plurality of input ports that are respectively optically coupled to the output ports of the first switches, and an output port, and

a plurality of cross connects that each include a plurality of input ports that are optically coupled to the output ports of the second switches, and a plurality of output ports that output the optical signals to the receivers.

8. The optical drop device according to claim 7, wherein

the optical paths include:

a plurality of second couplers that each have an input port to which an optical signal output from one of the demultiplexers is input and a plurality of output ports, and

a plurality of switches that each have a plurality of input ports that are respectively optically coupled to the output ports of the second couplers, and an output port.

9. The optical drop device according to claim 7, wherein

the optical paths include:

a plurality of switches that each have an input port to which an optical signal from one of the demultiplexers is input, and a plurality of output ports,

a plurality of second couplers that each have a plurality of input ports that are respectively optically coupled to the output ports of the switches, and an output port, and

a plurality of cross connects that each have a plurality of input ports that are respectively optically coupled to the output ports of the second couplers and a plurality of output ports that output the optical signals to the receivers.

10. The optical drop device according to claim 7, wherein

the optical paths include a plurality of second wavelength selective switches that have input ports and output ports that are respectively optically coupled, an input port optically coupled to an output port of one of the optical switching devices and a plurality of output ports that output the optical signals to the receivers.