Optical transmission apparatus and optical signal processing method

• US 9,742,500 B2
• Filed: 03/28/2016
• Issued: 08/22/2017
• Est. Priority Date: 04/24/2015
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kachita, Yoshito, Shukunami, Norifumi
• Primary Examiner(s): VANDERPUYE, KENNETH N
• Assistant Examiner(s): Sandhu, Amritbir
• Application Number:
  US15/082,039
• Publication Number:
  US 20160315709A1
• Time in Patent Office: 512 Days
• CPC Class Codes: H04B 10/294 in a multiwavelength system, e.g. gain equalisation
• CPC Class Codes: H04B 10/506 Multiwavelength transmitters
• CPC Class Codes: H04B 10/564 Power control

Abstract

An optical transmission apparatus includes an amplifier array device; and a switch device coupled to the amplifier array device via an optical cable, wherein the amplifier array device includes a plurality of amplifiers configured to amplify a plurality of optical signals at mutually different wavelengths and to output the plurality of amplified optical signals, a plurality of beam separators configured to generate a plurality of separated light beams by separating the plurality of amplified optical signals and to output the plurality of separated light beams, a beam combiner configured to generate combined light by combining the plurality of separated light beams and to output the combined light to the switch device through the optical cable, and a photo-detector configured to detect a power of the combined light returned from the switch device through the optical cable.

Claims

1. An optical transmission apparatus comprising:

an amplifier array device; and

a switch device coupled to the amplifier array device via an optical cable,

wherein the amplifier array device includes;

a plurality of amplifiers configured to amplify a plurality of optical signals at mutually different wavelengths and to output the plurality of amplified optical signals,

a plurality of beam separators configured to generate a plurality of separated light beams by separating the plurality of amplified optical signals and to output the plurality of separated light beams,

a beam combiner configured to generate combined light by combining the plurality of separated light beams and to output the combined light to the switch device through the optical cable,

a photo-detector configured to detect a power of the combined light returned from the switch device through the optical cable, and

a processor configured to determine whether defective connection of the optical cable occurs between the amplifier array device and the switch device, based on the power of the combined light,

wherein the processor is configured to cause a power of the plurality of amplified optical signals, output from the plurality of amplifiers, to be decreased when the power of the combined light detected by the photo-detector falls below a predetermined value.

2. The optical transmission apparatus according to claim 1,

wherein the switch device includes a waveguide configured to return and output, to the amplifier array device through the optical cable, the combined light input from the amplifier array device through the optical cable.

3. The optical transmission apparatus according to claim 1,

wherein the switch device includes optical switches configured to receive, through the optical cable, the plurality of amplified optical signals output from the plurality of beam separators and to output each of the amplified optical signals to a corresponding one of different transponders.

4. An optical transmission apparatus, comprising:

an amplifier array device; and

a switch device coupled to the amplifier array device via an optical cable,

wherein the amplifier array device includes;

a plurality of amplifiers configured to amplify a plurality of optical signals at mutually different wavelengths and to output the plurality of amplified optical signals,

a photo-detector configured to detect a power of combined light input from the switch device through the optical cable, and

a processor configured to determine whether defective connection of the optical cable occurs between the amplifier array device and the switch device, based on the power of the combined light,

wherein the switch device includes;

a plurality of beam separators configured to generate a plurality of separated light beams by separating the plurality of amplified optical signals and to output the plurality of separated light beams, and

a beam combiner configured to generate the combined light by combining the plurality of separated light beams and to output the combined light to the amplifier array device through the optical cable, and

wherein the processor is configured to cause a power of the plurality of amplified optical signals, output from the plurality of amplifiers, to be decreased when the power of the combined light detected by the photo-detector falls below a predetermined value.

5. The optical transmission apparatus according to claim 4, wherein the switch device includes optical switches configured to receive, through the optical cable, the plurality of amplified optical signals output from the plurality of beam separators and to output each of the amplified optical signals to a corresponding one of different transponders.

6. An optical signal processing method performed by an optical transmission apparatus including an amplifier array device and a switch device coupled to the amplifier array device via an optical cable, the optical signal processing method comprising:

amplifying, by the amplifier array device, a plurality of optical signals at mutually different wavelengths and outputting the plurality of amplified optical signals;

separating, by the amplifier array device, the plurality of amplified optical signals to generate a plurality of separated light beams and outputting the plurality of generated separated light beams;

combining, by the amplifier array device, the plurality of generated separated light beams to generate combined light and outputting the generated combined light to the switch device through the optical cable;

detecting, by the amplifier array device, a power of the generated combined light returned from the switch device through the optical cable;

determining, by the amplifier array device, whether defective connection of the optical cable occurs between the amplifier array device and the switch device, based on the power of the combined light; and

causing a power of the plurality of amplified optical signals, output from the plurality of amplifiers, to be decreased when the power of the combined light falls below a predetermined value.