OPTICAL TRANSMISSION DEVICE

• US 20150098696A1
• Filed: 12/10/2014
• Published: 04/09/2015
• Est. Priority Date: 06/11/2012
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: OI, Hiroki, KOMAKI, Kosuke
• Granted Patent: US 9,432,113 B2
• Time in Patent Office: Days
• US Class Current: 398/38
• CPC Class Codes: H04B 10/07955 Monitoring or measuring power
• CPC Class Codes: H04B 10/0797 Monitoring line amplifier or line repeater equipment
• CPC Class Codes: H04B 10/564 Power control
• CPC Class Codes: H04J 14/0212 using optical switches or wavelength selective switches [WSS]
• CPC Class Codes: H04J 14/02122 Colourless, directionless or contentionless [CDC] arrangements
• CPC Class Codes: H04J 14/02126 Multicast switch arrangements
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant
• CPC Class Codes: H04J 14/02216 by gain equalization
• CPC Class Codes: H04Q 11/0003 Details

Abstract

An optical transmission device including a wavelength selective switch including plural output ports, an optical intensity monitoring device that receives each optical signal output from the plural output ports of the wavelength selective switch and monitors the optical intensity of the optical signals, and a controller that controls optical intensity of the optical signals from the plural output ports of the wavelength selective switch based on the optical intensities monitored by the optical intensity monitoring device.

Claims

1. An optical transmission device comprising:

a wavelength selective switch including a plurality of output ports;

an optical intensity monitoring device that receives optical signals output from each of the plurality of output ports of the wavelength selective switch and monitors optical intensities of the optical signals; and

a controller that controls optical intensities of the optical signals from the plurality of output ports of the wavelength selective switch, based on the optical intensities monitored by the optical intensity monitoring device.

2. The optical transmission device of claim 1, wherein:

the optical intensity monitoring device includes

a coupling device that receives each optical signal output from the plurality of output ports of the wavelength selective switch, couples together the optical signals output from the respective plurality of output ports, and outputs a coupled optical signal, and

a second optical intensity monitoring device that receives the coupled optical signal and monitors an optical intensity of the coupled optical signal.

3. The optical transmission device of claim 1, wherein:

the optical intensity monitoring device includes

an optical switch that is provided with a plurality of input ports, that receives through the plurality of input ports a plurality of optical signals respectively output from the plurality of output ports of the wavelength selective switch, and switches and outputs the optical signals received by the plurality of input ports, and

a second optical intensity monitoring device that monitors an optical intensity of an optical signal output from the optical switch.

4. The optical transmission device of claim 1, wherein the optical intensity monitoring device includes:

a plurality of optical switches that are each provided with a plurality of input ports, that receive through the plurality of input ports optical signals respectively output from the plurality of output ports of the wavelength selective switch, and that switch and output the optical signals received by the plurality of input ports; and

a second optical intensity monitoring device that monitors an optical intensity of each optical signal output from the plurality of optical switches.

5. The optical transmission device of claim 1, wherein:

the optical intensity monitoring device includes a plurality of second optical intensity monitoring devices that receive optical signals output from each of the plurality of output ports of the wavelength selective switch and monitor respective optical intensities of the optical signals.

6. The optical transmission device of claim 1, further comprising a second wavelength selective switch including a plurality of input ports, wherein:

the wavelength selective switch is disposed at a drop side;

the second wavelength selective switch is disposed at an add side; and

the optical intensity monitoring device further includes a second optical switch that switches between an optical signal based on optical signals output respectively from the plurality of output ports of the wavelength selective switch, and an optical signal output from the second wavelength selective switch, and that inputs the selected optical signal to the second optical intensity monitoring device.

7. The optical transmission device of claim 1, wherein the second optical intensity monitoring device is an optical channel monitor.

8. The optical transmission device of claim 7, wherein the optical channel monitor monitors an optical intensity of each channel.

9. The optical transmission device of claim 7, wherein the optical channel monitor includes a single input port.

10. The optical transmission device of claim 7, wherein the optical channel monitor includes a plurality of input ports.

11. The optical transmission device of claim 1, further comprising a splitter device that splits optical signals respectively output from the plurality of output ports of the wavelength selective switch, and inputs the split optical signals to the optical intensity monitoring device.

12. An optical transmission method comprising:

receiving optical signals respectively output from a plurality of output ports of a wavelength selective switch, and monitoring optical intensities of the optical signals using an optical intensity monitoring device; and

controlling optical intensities of the optical signals from the plurality of output ports of the wavelength selective switch based on the optical intensities monitored by the optical intensity monitoring device.