Oadm node and method in wdm system

Patent metadata

Field	Value
Publication number	US-2018198550-A1
Application number	US-201815914716-A
Country	US
Kind code	A1
Filing date	Mar 7, 2018
Priority date	Sep 8, 2015
Publication date	Jul 12, 2018
Grant date	—

Abstract

A node in a wavelength division multiplexing (WDM) system is provided, which includes: a colorless optical transmitter, a first arrayed waveguide grating, a first waveband filter configured to divide an input optical signal into M sub-signals of different wavebands and output to a first optical switch, and a first optical coupler/a first optical combiner. A transmit end of the colorless optical transmitter is coupled to an input end of the first waveband filter via the first arrayed waveguide grating. The first optical switch is configured to connect an output end of the first waveband filter to an input end of the first optical coupler/the first optical combiner according to a control signal. An output end of the first optical coupler/the first optical combiner is coupled to an optical transmission path.

First claim

What is claimed is:

1 . A node in a wavelength division multiplexing (WDM) system, comprising an adding unit, wherein the adding unit comprises:
a colorless optical transmitter; a first arrayed waveguide grating; a first waveband filter configured to divide an input optical signal of the first waveband filter into M sub-signals of different wavebands, wherein M is an integer greater than 1, and the M sub-signals of different wavebands are respectively output by M output ends of the first waveband filter; a first optical switch; and a first optical coupler/a first optical combiner coupled to the first optical switch; wherein a transmit end of the colorless optical transmitter is coupled to an input end of the first waveband filter via the first arrayed waveguide grating; wherein the first optical switch is configured to connect an output end in the M output ends of the first waveband filter to an input end of the first optical coupler/the first optical combiner according to a first control signal, such that a sub-signal output by the output end of the first waveband filter is passed to the first optical coupler/the first optical combiner through the first optical switch; and wherein an output end of the first optical coupler/the first optical combiner is coupled to an optical transmission path.

2 . The node in the WDM system according to claim 1 , wherein the node further comprises a first dropping unit, the first dropping unit comprising:
a second waveband filter configured to divide an input optical signal of the second waveband filter into N sub-signals of different wavebands, wherein N is an integer greater than 1, and the N sub-signals of different wavebands are respectively output by N output ends of the second waveband filter; N second optical switches coupled to the second waveband filter; a first optical multiplexer coupled to the N second optical switches; a second optical multiplexer coupled to the N second optical switches; a second arrayed waveguide grating; and a first colorless optical receiver; and wherein an input end of the second waveband filter is coupled to the optical transmission path, and each of the N second optical switches is configured to connect an output end in the N output ends of the second waveband filter to an input end of the first optical multiplexer or an input end of the second optical multiplexer according to a second control signal, such that a sub-signal output by the second waveband filter is transmitted to the first optical multiplexer or the second optical multiplexer through a corresponding second optical switch; wherein the first optical multiplexer is configured to perform multiplexing processing on an input signal of the first optical multiplexer, and an output end of the first optical multiplexer is coupled to a receive end of the first colorless optical receiver via the second arrayed waveguide grating; and wherein the second optical multiplexer is configured to perform multiplexing processing on an input signal of the second optical multiplexer, and an output end of the second optical multiplexer is coupled to the optical transmission path.

3 . The node in the WDM system according to claim 2 , wherein the optical transmission path is a single-fiber bidirectional optical transmission path, and the node comprises two adding units, wherein a first adding unit in the two adding units is configured to add a first output optical signal of the node onto a first transmission direction of the optical transmission path, and a second adding unit in the two adding units is configured to add a second output optical signal onto a second transmission direction of the optical transmission path.

4 . The node in the WDM system according to claim 3 , wherein the node comprises two first dropping units, a first dropping unit in the two first dropping units is configured to drop a first optical signal transmitted in the first transmission direction of the optical transmission path, and a second dropping unit in the two first dropping units is configured to drop a second optical signal transmitted in the second transmission direction of the optical transmission path.

5 . The node in the WDM system according to claim 1 , wherein the node further comprises a second dropping unit, the second dropping unit comprising:
a third waveband filter configured to divide an input optical signal of the third waveband filter into K sub-signals of different wavebands, wherein K is an integer greater than 1, and the K sub-signals of different wavebands are respectively output by K output ends of the third waveband filter; K third optical switches coupled to the K output ends of the third waveband filter; a third optical multiplexer; a third arrayed waveguide grating; and a second colorless optical receiver; wherein an input end of the third waveband filter is coupled to the optical transmission path, and each of the K third optical switches is configured to determine, according to a third control signal, whether to connect an output end in the K output ends of the third waveband filter to an input end of the third optical multiplexer so that a sub-signal output by the output end is passed to the third optical multiplexer; and wherein the third optical multiplexer is configured to perform multiplexing processing on an input signal of the third optical multiplexer, and an output end of the third optical multiplexer is coupled to a receive end of the second colorless optical receiver via the third arrayed waveguide grating.

6 . The node in the WDM system according to claim 1 , wherein the adding unit further comprises a second optical coupler and a partial light reflector, the first optical switch is coupled to the input end of the first optical coupler/the first optical combiner via the second optical coupler, and the first optical switch is further coupled to the partial light reflector via the second optical coupler.

7 . The node in the WDM system according to claim 1 , wherein the first control signal comprises a plurality of electrical signals, each of the plurality of electrical signals instructs to connect the input end of the first optical coupler/the first optical combiner to a preset output end in the M output ends of the first waveband filter, and the plurality of electrical signals are sent by an optical network management plane, an optical network control plane, or an optical network controller in the WDM system.

8 . The node in the WDM system according to claim 1 , wherein the node is an optical add/drop multiplexing (OADM) node in the WDM system.

9 . The node in the WDM system according to claim 1 , wherein the colorless optical transmitter comprises a tunable laser, a Fabry-Perot (FP) laser, a reflective semiconductor optical amplifier (RSOA), a reflective electro-absorption modulator (REAM), or a REAM integrated with a semiconductor optical amplifier (REAM-SOA).

10 . A node in a point-to-point WDM system, wherein the node comprises:
a 1:2 waveband filter configured to divide an input optical signal of the 1:2 waveband filter into two sub-signals of different wavebands, wherein the two sub-signals of different wavebands are respectively output by two output ports of the 1:2 waveband filter; a 2:2optical switch having two first ports and two second ports; a colorless optical transmitter; a colorless optical receiver; a first arrayed waveguide grating; and a second arrayed waveguide grating; wherein a common port of the 1:2 waveband filter is coupled to an optical transmission path, and the two output ports of the 1:2 waveband filter are respectively coupled to the two first ports of the 2:2 optical switch; wherein one second port of the 2:2 op

Assignees

• Huawei Tech Co Ltd

Inventors

• Deng Ning
• Cao Shiyi
• Luo Jun

Classifications

• H04B10/275

  Ring-type networks · CPC title

• H04J14/0213

  Groups of channels or wave bands arrangements · CPC title

• H04Q11/0005

  Switch and router aspects · CPC title

• H04B10/2581

  Multimode transmission · CPC title

• H04Q11/0062

  Network aspects · CPC title