OPTICAL DROP APPARATUS, OPTICAL ADD APPARATUS, AND OPTICAL ADD/DROP APPARATUS

• US 20140147121A1
• Filed: 09/23/2013
• Published: 05/29/2014
• Est. Priority Date: 11/28/2012
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: MATSUKAWA, Yoshinobu
• Granted Patent: US 9,520,959 B2
• Time in Patent Office: Days
• 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 14/0206 Express channels arrangements
• 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

Abstract

Provided is an optical apparatus including: wavelength separation units corresponding to the respective routes, each of which divides a wavelength multiplexed optical signal of one route into M wavelength groups (M is an integer satisfying N×M=the number of multiplexed wavelengths of the wavelength multiplexed optical signal of one route), each of which includes N wavelengths (N is an integer of 2 or more); and M wavelength separation blocks, each of which is input with a plurality of the wavelength groups divided by the different wavelength separation units and outputs optical signals with any one or a plurality of wavelengths included in the input wavelength groups to N coherent transponders. Accordingly, it is possible to flexibly adapt to extension in wavelength or extension in route in units of a wavelength separation block and/or wavelength multiplexing block.

Claims

1. An optical drop apparatus comprising a plurality of routes and comprising coherent transponders capable of simultaneously receiving optical signals with N wavelengths (N is an integer of 2 or more), comprising:

wavelength separation units corresponding to the respective routes, each of which divides a wavelength multiplexed optical signal of one route into M wavelength groups, each of which includes N wavelengths (M is an integer satisfying N×

M=the number of multiplexed wavelengths of the wavelength multiplexed optical signal); and

M wavelength separation blocks, each of which is input with a plurality of the wavelength groups divided by the different wavelength separation units and outputs optical signals having any one or a plurality of wavelengths included in the input wavelength groups to N coherent transponders.

2. The optical drop apparatus according to claim 1, wherein the wavelength separation block is a CD (colorless and direction-less) block which multiplexes the plurality of the wavelength groups and N-branches the multiplexed optical signal into N coherent transponders.

3. The optical drop apparatus according to claim 1, wherein the wavelength separation block is a CDC (colorless, direction-less, and contention-less) block which selects any one of the plurality of the wavelength groups and outputs the selected wavelength group to the coherent transponders.

4. The optical drop apparatus according to claim 1,

wherein at least one of the wavelength separation blocks is CD (colorless and direction-less) block, each of which multiplexes the plurality of the wavelength groups and N-branches the multiplexed optical signal into N coherent transponders, and

wherein the rest of the wavelength separation blocks are CDC (colorless, direction-less, and contention-less) blocks, each of which selects any one of the plurality of the wavelength groups and outputs the wavelength group to the coherent transponders.

5. The optical drop apparatus according to claim 1, further comprising a wavelength selection switch which selectively through-inputs an optical signal having any one wavelength among the wavelength multiplexed optical signal to a different route and selectively inputs an optical signal of any other wavelength among the wavelength multiplexed optical signal to the wavelength separation unit.

6. The optical drop apparatus according to claim 1, wherein the wavelength separation block comprises a switch function of an OUPSR (Optical Unidirectional Path Switched Ring), which selectively outputs an optical signal redundantly input from different routes.

7. An optical drop apparatus comprising a plurality of routes and comprising coherent transponders capable of simultaneously receiving optical signals with N wavelengths (N is an integer of 2 or more), comprising:

wavelength separation units corresponding to the respective routes, each of which M-branches a wavelength multiplexed optical signal of one route (M is an integer satisfying N×

M=the number of multiplexed wavelengths of the wavelength multiplexed optical signal); and

M wavelength separation blocks, each of which is input with optical signals branched by the different wavelength separation units and selectively outputs the input optical signals to N coherent transponders in units of M wavelength groups, each of which includes N wavelengths.

8. An optical add apparatus having a plurality of routes, comprising:

M wavelength multiplexing blocks (M is an integer satisfying N×

M=the number of multiplexed wavelengths of wavelength multiplexed optical signals of one route), each of which wavelength-multiplexes optical signals transmitted from N coherent transponders (N is an integer of 2 or more); and

wavelength selection switches, each of which is installed corresponding to each route to selectively output wavelength multiplexed optical signals transmitted from different wavelength multiplexing blocks to the corresponding route in units of wavelength.

9. The optical add apparatus according to claim 8, wherein the wavelength multiplexing block is a CD (colorless and direction-less) block which multiplexes optical signals from the N coherent transponders and branches the multiplexed optical signals into different wavelength selection switches.

10. The optical add apparatus according to claim 8, wherein the wavelength multiplexing block is a CDC (colorless, direction-less, and contention-less) block which selects a plurality (maximum N) of optical signals from the N coherent transponders to multiplex the optical signals and selectively switches to a wavelength selection switch of a different route to output the optical signals to the wavelength selection switch.

11. The optical add apparatus according to claim 8,

wherein at least one of the wavelength multiplexing blocks is CD (colorless and direction-less) block, each of which multiplexes optical signals from the N coherent transponders and branches the multiplexed optical signals into different wavelength selection switches, and

wherein the rest of the wavelength multiplexing blocks are CDC (colorless, direction-less, and contention-less) blocks, each of which selects a plurality (maximum N) of optical signals from the N coherent transponders to multiplex the optical signals and selectively switches to a wavelength selection switch of a different route to output the optical signals to the wavelength selection switch.

12. The optical add apparatus according to claim 8, further comprising a second wavelength selection switch which selectively outputs:

an optical signal which is to be output to a specific route, the optical signal being input from the wavelength selection switch; and

an optical signal which is through-input from another different route to the specific route.

13. The optical add apparatus according to claim 8, wherein the wavelength multiplexing block comprises a bridge function of an OUPSR (Optical Unidirectional Path Switched Ring), which branches optical signals which are to be redundantly output to different routes.

14. An optical add apparatus having a plurality of routes, comprising:

wavelength multiplexing units, each of which is installed corresponding to each route to multiplex input optical signals and to output the multiplexed optical signal to the corresponding route; and

M wavelength multiplexing blocks, each of which selectively outputs optical signals transmitted from N coherent transponders (N is an integer of 2 or more) to the wavelength multiplexing units of different routes in units of M wavelength groups, each of which includes N wavelengths, (M is an integer satisfying N×

M=the number of multiplexed wavelengths of a wavelength multiplexed optical signal of one route).

15. An optical add/drop apparatus comprising a plurality of routes and comprising coherent transponders capable of simultaneously receiving optical signals with N wavelengths (N is an integer of 2 or more), comprising:

wavelength separation units corresponding to the respective routes, each of which divides a wavelength multiplexed optical signal of one route into M wavelength groups, each of which includes N wavelengths, (M is an integer satisfying N×

M=the number of multiplexed wavelengths of the wavelength multiplexed optical signal);

M wavelength separation blocks, each of which is input with a plurality of the wavelength groups divided by the different wavelength separation units and outputs optical signals having any one or a plurality of wavelengths included in the input wavelength groups to N coherent transponders;

M wavelength multiplexing blocks, each of which wavelength-multiplexes optical signals transmitted from different N coherent transponders; and

wavelength selection switches, each of which is installed corresponding to each route to selectively output wavelength multiplexed optical signals transmitted from different wavelength multiplexing blocks to the corresponding route in units of wavelength.