TRANSMISSION DEVICE AND TRANSMISSION METHOD

• US 20140126903A1
• Filed: 09/23/2013
• Published: 05/08/2014
• Est. Priority Date: 11/06/2012
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: SHUKUNAMI, Norifumi, OI, Hiroki, KANEOKA, Tomohiro
• Granted Patent: US 9,444,572 B2
• Time in Patent Office: Days
• US Class Current: 398/48
• 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 14/0208 Interleaved arrangements
• CPC Class Codes: H04J 14/0209 Multi-stage arrangements, e.g. by cascading multiplexers or demultiplexers
• CPC Class Codes: H04J 14/0212 using optical switches or wavelength selective switches [WSS]

Abstract

A transmission device includes: optical transmitters configured to transmit optical signals of different wavelengths; optical couplers configured to multiplexing the optical signals transmitted from the optical transmitters; and a wavelength selective switch configured to multiplex multiplexed optical signals obtained by multiplexing by the couplers, wherein optical signals, a wavelength interval between which is less than a predetermined value, are transmitted to separate optical couplers of the optical couplers, among the optical signals.

Claims

1. A transmission device comprising:

optical transmitters configured to transmit optical signals of different wavelengths;

optical couplers configured to multiplexing the optical signals transmitted from the optical transmitters; and

a wavelength selective switch configured to multiplex multiplexed optical signals obtained by multiplexing by the couplers, wherein

optical signals, a wavelength interval between which is less than a predetermined value, are transmitted to separate optical couplers of the optical couplers, among the optical signals.

2. The transmission device according to claim 1, wherein

optical signals, of which channel numbers assigned to wavelengths are continuing, are transmitted to separate optical couplers of the optical couplers, among the optical signals.

3. The transmission device according to claim 2, wherein

an optical signal of which the channel number is an odd number and an optical signal of which the channel number is an even number are transmitted to separate optical couplers of the optical couplers, among the optical signals.

4. The transmission device according to claim 1, further comprising:

selecting units configured to select destinations of the optical signals transmitted from the optical transmitters from the optical couplers.

5. The transmission device according to claim 4, further comprising:

a control unit configured to control the selecting units based on wavelengths of the optical signals.

6. The transmission device according to claim 5, further comprising:

first detecting units configured to detect wavelengths of the optical signals transmitted from the optical transmitters and notify the control unit of detected wavelengths.

7. The transmission device according to claim 5, further comprising:

a second detecting unit configured to sequentially select the optical signals transmitted from the optical transmitters, detect a wavelength of a selected optical signal, and notify the control unit of a detected wavelength.

8. A transmission method comprising:

transmitting optical signals, a wavelength interval between which is less than a predetermined value, to separate optical couplers, among optical signals of different wavelengths; and

multiplexing and transmitting multiplexed optical signals, which are obtained by multiplexing by the optical couplers, by a wavelength selective switch.

9. The transmission method according to claim 8, wherein

optical signals, of which channel numbers assigned to wavelengths are continuing, are transmitted to separate optical couplers of the optical couplers, among the optical signals.

10. The transmission method according to claim 9, wherein

an optical signal of which the channel number is an odd number and an optical signal of which the channel number is an even number are transmitted to separate optical couplers of the optical couplers, among the optical signals.

11. The transmission method according to claim 8, further comprising:

detecting wavelengths of the optical signals; and

selecting destinations of the optical signals from the optical couplers based on detected wavelengths.