OPTICAL TRANSMISSION EQUIPMENT

• US 20120141121A1
• Filed: 12/02/2011
• Published: 06/07/2012
• Est. Priority Date: 12/06/2010
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: ITOH, Hiroyuki, Takatsu, Kazuo
• Application Number:
  US13/310,029
• Publication Number:
  US 20120141121A1
• Time in Patent Office: Days
• US Class Current: 398/34
• CPC Class Codes: H04B 10/294 in a multiwavelength system, e.g. gain equalisation
• 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 14/0212 using optical switches or wavelength selective switches [WSS]
• CPC Class Codes: H04J 14/0221 Power control, e.g. to keep the total optical power constant

Abstract

Optical transmission equipment includes: a first optical amplifier to amplify an input optical signal; a second optical amplifier provided at an output side of the first optical amplifier; an optical module having a first relay port to receive an optical signal from the first optical amplifier, a second relay port to output an optical signal to the second optical amplifier, an optical device provided between the first relay port and the second relay port, and a first output port optically couplable to the optical device; and a second output port to output the optical signal amplified by the second optical amplifier.

Claims

1. Optical transmission equipment, comprising:

a first optical amplifier to amplify an input optical signal;

a second optical amplifier provided at an output side of the first optical amplifier;

an optical module having a first relay port to receive an optical signal from the first optical amplifier, a second relay port to output an optical signal to the second optical amplifier, an optical device provided between the first relay port and the second relay port, and a first output port optically couplable to the optical device; and

a second output port to output the optical signal amplified by the second optical amplifier.

2. The optical transmission equipment according to claim 1, wherein

the optical device is an optical splitter to generate a first and second split optical signals from the optical signal received through the first relay port,

the first split optical signal is guided to the first output port and the second split optical signal is guided to the second relay port in the optical module.

3. The optical transmission equipment according to claim 2, wherein

the optical splitter splits the optical signal received through the first relay port so that power of the first split optical signal is higher than power of the second split optical signal.

4. The optical transmission equipment according to claim 2, wherein

an optical transmission line and a client circuit are optically coupled to the optical transmission equipment,

the optical transmission equipment outputs the first split optical signal to the optical transmission line, and guides the second split optical signal to the client circuit.

5. The optical transmission equipment according to claim 2, wherein

an optical transmission line of a first optical network and another optical transmission equipment belonging to a second optical network are optically coupled to the optical transmission equipment,

the optical transmission equipment outputs the first split optical signal to the optical transmission line of the first optical network, and guides the second split optical signal to the other optical transmission equipment belonging to the second optical network.

6. The optical transmission equipment according to claim 1, wherein

the optical device is a dispersion compensator to compensate for chromatic dispersion,

an optical signal output from the dispersion compensator is guided to the second relay port in the optical module.

7. Optical transmission equipment, comprising:

a first optical amplifier to amplify an input optical signal;

an optical splitter to split the optical signal output from the first optical amplifier to generate first and second split optical signals;

a first output port to output the first split optical signal;

a dispersion compensator to compensate for chromatic dispersion of the second split optical signal;

a second optical amplifier to amplify the optical signal output from the dispersion compensator; and

a second output port to output the optical signal amplified by the second optical amplifier.

8. The optical transmission equipment according to claim 7, wherein

the optical splitter splits the optical signal output from the first optical amplifier so that power of the second split optical signal is higher than power of the first split optical signal.

9. The optical transmission equipment according to claim 7, wherein

the input optical signal is a WDM optical signal,

the optical transmission equipment further comprises a wavelength selective switch to select an optical signal of a first wavelength in the first split optical signal output from the first output port, and to select an optical signal of a second wavelength in the second split optical signal output from the second output port.

10. Optical transmission equipment, comprising:

a first optical amplifier to amplify an input WDM optical signal;

an equalizer to control the WDM optical signal output from the first optical amplifier;

a second optical amplifier to amplify the WDM optical signal controlled by the equalizer; and

a channel monitor to monitor power of each channel of the WDM optical signal, wherein

the equalizer controls the WDM optical signal output from the first optical amplifier according to a monitor result obtained by the channel monitor.

11. The optical transmission equipment according to claim 10, further comprising

an optical splitter provided between the equalizer and the second optical amplifier, wherein

the channel monitor monitors the WDM optical signal split by the optical splitter.

12. The optical transmission equipment according to claim 10, further comprising

an optical splitter to split the WDM optical signal output from the second optical amplifier, wherein

the channel monitor monitors the WDM optical signal split by the optical splitter.

13. The optical transmission equipment according to claim 10, further comprising:

a third optical amplifier provided at an output side of the second optical amplifier; and

an optical splitter to split the WDM optical signal output from the third optical amplifier, wherein

the channel monitor monitors the WDM optical signal split by the optical splitter.