Optical signal amplification apparatus and related optical communication device

Patent metadata

Field	Value
Publication number	US-2023318248-A1
Application number	US-202318332892-A
Country	US
Kind code	A1
Filing date	Jun 12, 2023
Priority date	Dec 30, 2020
Publication date	Oct 5, 2023
Grant date	—

Abstract

An optical signal amplification apparatus and a related optical communication device. The apparatus may include a pump light source, a combiner assembly, a doped optical fiber, and an optical filter. The pump light source may be configured to emit a pump beam. The combiner assembly is configured to combine a signal beam and the pump beam and couple a combined beam into the doped optical fiber. The doped optical fiber is configured to amplify the signal beam under excitation by the pump beam. The signal beam includes one or more single-wavelength signals. The optical filter is disposed between two ends of the doped optical fiber and configured to transmit the signal beam and filter out a first beam in the doped optical fiber. The first beam includes a beam of some wavelengths or all wavelengths generated by spontaneous emission in the doped optical fiber.

First claim

What is claimed is:

1 . An optical signal amplification apparatus, comprising:
a pump light source, wherein the pump light source is configured to emit a pump beam; a combiner assembly, wherein the combiner assembly is configured to combine a signal beam and the pump beam that are received and couple a combined beam into the doped optical fiber; a doped optical fiber, wherein the doped optical fiber is configured to amplify the signal beam under excitation by the pump beam; and an optical filter, wherein
the signal beam comprises one or more single-wavelength signals, the optical filter is disposed between two ends of the doped optical fiber, the optical filter is configured to transmit the signal beam in the doped optical fiber and is configured to filter out a first beam in the doped optical fiber, and the first beam comprises a beam of some wavelengths or a beam of all wavelengths generated by spontaneous emission in the doped optical fiber.

2 . The optical signal amplification apparatus according to claim 1 , wherein the optical filter is a long-period fiber grating inscribed at any position between the two ends of the doped optical fiber.

3 . The optical signal amplification apparatus according to claim 1 , further comprising:
a plurality of optical filters disposed at different positions between the two ends of the doped optical fiber.

4 . The optical signal amplification apparatus according to claim 1 , wherein the doped optical fiber further comprises:
a first optical fiber and a second optical fiber that are respectively located on two sides of the optical filter; and the optical filter is configured to filter out a part of beam in the first beam that is transmitted from the first optical fiber to the second optical fiber, and/or is configured to filter out a part of beam in the first beam that is transmitted from the second optical fiber to the first optical fiber.

5 . The optical signal amplification apparatus according to claim 1 , wherein the doped optical fiber is an erbium-doped fiber, and a stopband frequency of the optical filter comprises a frequency of a beam with a wavelength of 1530 nm.

6 . The optical signal amplification apparatus according to claim 5 , wherein the signal beam comprises at least a beam with a wavelength of 1490 nm and a beam with a wavelength of 1577 nm, and an inversion rate of erbium ions in the erbium-doped fiber is greater than 70%.

7 . The optical signal amplification apparatus according to claim 1 , further comprising:
a plurality of doped optical fibers connected in parallel, wherein an optical filter is disposed between two ends of each of the doped optical fibers, the combiner assembly comprises a dichroscope, and the apparatus further comprises an optical splitter and a plurality of collimation lenses; the optical splitter is configured to split the pump beam to obtain a plurality of split pump beams; each of the plurality of collimation lenses is configured to collimate and transmit one pump beam of the plurality of split pump beams to the dichroscope; and the dichroscope is configured to receive a plurality of signal beams and the plurality of split pump beams passing through the plurality of collimation lenses, is further configured to combine different pump beams of the plurality of pump beams with different signal beams of the plurality of signal beams and is further configured to input different beams after the combination into the different doped optical fibers.

8 . An optical communication device, comprising:
an electrical signal processing apparatus, wherein the electrical signal processing apparatus is configured to generate a first electrical signal that carries first service information; a laser emitting apparatus, wherein the laser emitting apparatus is configured to emit a plurality of single-wavelength beams of different wavelengths based on the first electrical signal, and each of the single-wavelength beams carries a part or all of service information in the first service information; a beam splitting/combining apparatus, wherein the beam splitting/combining apparatus is configured to combine the plurality of single-wavelength beams of different wavelengths into a signal beam; an optical signal amplification apparatus, wherein the optical signal amplification apparatus comprises a pump light source, a combiner assembly, a doped optical fiber, and an optical filter; and a first optical fiber connection apparatus, wherein
the optical signal amplification apparatus is configured to amplify the signal beam,
the pump light source is configured to emit a pump beam, the combiner assembly is configured to combine the signal beam and the pump beam that are received, and couple a combined beam into the doped optical fiber, the doped optical fiber is configured to amplify the signal beam under excitation by the pump beam, and the signal beam comprises one or more single-wavelength signals; and
the optical filter is disposed between two ends of the doped optical fiber, the optical filter is configured to transmit the signal beam in the doped optical fiber and is configured to filter out a first beam in the doped optical fiber, and the first beam comprises a beam of some wavelengths or a beam of all wavelengths generated by spontaneous emission in the doped optical fiber; and
the first optical fiber connection apparatus is configured to output the signal beam amplified by the optical signal amplification apparatus.

9 . The optical communication device according to claim 8 , wherein the optical filter is a long-period fiber grating inscribed at any position between the two ends of the doped optical fiber.

10 . The optical communication device according to claim 8 , wherein the optical signal amplification apparatus further comprises:
a plurality of optical filters disposed at different positions between the two ends of the doped optical fiber.

11 . The optical communication device according to claim 8 , wherein the doped optical fiber comprises a first optical fiber and a second optical fiber that are respectively located on two sides of the optical filter; and
the optical filter is configured to filter out a part of beam in the first beam that is transmitted from the first optical fiber to the second optical fiber, and/or is configured to filter out a part of beam in the first beam that is transmitted from the second optical fiber to the first optical fiber.

12 . The optical communication device according to claim 8 , wherein the doped optical fiber is an erbium-doped fiber, and a stopband frequency of the optical filter comprises a frequency of a beam with a wavelength of 1530 nm.

13 . The optical communication device according to claim 12 , wherein the signal beam comprises at least a beam with a wavelength of 1490 nm and a beam with a wavelength of 1577 nm, and an inversion rate of erbium ions in the erbium-doped fiber is greater than 70%.

14 . The optical communication device according to claim 8 , wherein the optical signal amplification apparatus further comprises:
a plurality of doped optical fibers connected in parallel, and an optical filter disposed between two ends of each of the doped optical fibers, the combiner assembly comprises a dichroscope, and the apparatus further comprises an optical splitter and a plurality of collimation lenses; the optical splitter is configured to split the pump beam to obtain a plurality of split pump beams; each of the plurality of collimation lenses is configured to collimate and transmit one pump beam of the plurality of split pump beams to the dichroscope; and the dichroscope is c

Assignees

• Huawei Tech Co Ltd

Inventors

• Yu Yongze
• Jiang Hengyun
• Wu Bo

Classifications

• H04B10/291

  in which processing or amplification is carried out without conversion of the main signal from optical form · CPC title

• H01S3/0675 Primary

  Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers · CPC title

• H01S3/06754 Primary

  Fibre amplifiers (H01S3/06708 takes precedence) · CPC title

• H01S3/094003

  the pumped medium being a fibre · CPC title

• H01S3/1608

  erbium · CPC title