Optical receiver module, optical receiving method, optical line terminal, PON system, and optical filter

Patent metadata

Field	Value
Publication number	US-11095375-B2
Application number	US-201816624073-A
Country	US
Kind code	B2
Filing date	Jun 6, 2018
Priority date	Jun 27, 2017
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

An optical receiver module which receives a first optical signal including a continuous signal or a burst signal includes: a variable optical attenuator which adjusts the first optical signal to output a second optical signal; a semiconductor optical amplifier which amplifies the second optical signal to output a third optical signal; and a controller which controls an output of at least one of the variable optical attenuator and the semiconductor optical amplifier so as to cause the semiconductor optical amplifier to operate in a region in which gain saturation of the semiconductor optical amplifier does not occur, on the basis of at least one of: a power obtained by suppressing an outside portion of the wavelength band of the first optical signal in the third optical signal; and a power obtained by extracting the outside portion of the wavelength band of the first optical signal in the third optical signal.

First claim

The invention claimed is:

1. An optical receiver module configured to receive a first optical signal capable of including a continuous signal or a burst signal, the optical receiver module comprising:
a variable optical attenuator configured to adjust the first optical signal to output a second optical signal;
a semiconductor optical amplifier configured to amplify the second optical signal to output a third optical signal;
an optical filter configured to supply a first power obtained by suppressing an outside portion of a wavelength band of the first optical signal in the third optical signal and a second power obtained by extracting the outside portion of the wavelength band of the first optical signal in the third optical signal; and
a controller configured to control an output of at least one of the variable optical attenuator and the semiconductor optical amplifier so as to cause the semiconductor optical amplifier to operate in a region in which gain saturation of the semiconductor optical amplifier does not occur, on the basis of at least the second power, wherein the optical filter is configured to separate the third optical signal into: a fourth optical signal obtained by suppressing the outside portion of the wavelength band of the first optical signal in the third optical signal; and a fifth optical signal obtained by extracting the outside portion of the wavelength band of the first optical signal in the third optical signal, and
wherein the controller has stored therein a correspondence relationship between power of the second optical signal and a photoelectric current obtained by detecting the fifth optical signal.

2. The optical receiver module according to claim 1 , wherein the controller has stored therein a correspondence relationship between power of the second optical signal and both of a photoelectric current obtained by detecting the fourth optical signal and the photoelectric current obtained by detecting the fifth optical signal.

3. The optical receiver module according to claim 1 , wherein
with respect to reception of the first optical signal including the burst signal,
the controller first performs rough control for suppressing the gain saturation on the basis of either one of the first power and the second power, and then performs fine control for suppressing the gain saturation on the basis of either one of the first power and the second power.

4. An optical receiving method performed by an optical receiver module, the optical receiving method comprising:
receiving a first optical signal capable of including a continuous signal or a burst signal;
adjusting the first optical signal to output a second optical signal;
amplifying the second optical signal to output a third optical signal;
executing an optical filtering to separate the third optical signal into a fourth optical signal obtained by suppressing the outside portion of the wavelength band of the first optical signal and a fifth optical signal obtained by extracting the outside portion of the wavelength band of the first optical signal;
estimating a power of the second optical signal, on the basis of a correspondence relationship between the power and a photoelectric current obtained by detecting the fifth optical signal; and
controlling, on the basis of an estimation result, at least one of an adjusting degree of and an amplifying a degree so as to suppress gain saturation.

5. An optical line terminal configured to communicate with a plurality of optical network units via an optical fiber, the optical line terminal comprising, as a part thereof, an optical receiver module configured to receive a first optical signal capable of including a continuous signal or a burst signal, the optical receiver module including:
a variable optical attenuator configured to adjust the first optical signal to output a second optical signal;
a semiconductor optical amplifier configured to amplify the second optical signal to output a third optical signal;
an optical filter configured to supply a first power obtained by suppressing an outside portion of a wavelength band of the first optical signal in the third optical signal and a second power obtained by extracting the outside portion of the wavelength band of the first optical signal in the third optical signal; and
a controller configured to control an output of at least one of the variable optical attenuator and the semiconductor optical amplifier so as to cause the semiconductor optical amplifier to operate in a region in which gain saturation of the semiconductor optical amplifier does not occur, on the basis of at least the second power, wherein the optical filter is configured to separate the third optical signal into: a fourth optical signal obtained by suppressing the outside portion of the wavelength band of the first optical signal in the third optical signal; and a fifth optical signal obtained by extracting the outside portion of the wavelength band of the first optical signal in the third optical signal, and
wherein the controller has stored therein a correspondence relationship between power of the second optical signal and a photoelectric current obtained by detecting the fifth optical signal.

6. A PON system comprising:
a plurality of optical network units;
an optical transmission path formed by an optical fiber; and
an optical line terminal configured to communicate with the plurality of optical network units via the optical transmission path,
the optical line terminal including, as a part thereof, an optical receiver module configured to receive a first optical signal from the optical network units,
the optical receiver module including:
a variable optical attenuator configured to adjust the first optical signal to output a second optical signal;
a semiconductor optical amplifier configured to amplify the second optical signal to output a third optical signal;
an optical filter configured to supply a first power obtained by suppressing an outside portion of a wavelength band of the first optical signal in the third optical signal and a second power obtained by extracting the outside portion of the wavelength band of the first optical signal in the third optical signal; and
a controller configured to control an output of at least one of the variable optical attenuator and the semiconductor optical amplifier so as to cause the semiconductor optical amplifier to operate in a region in which gain saturation of the semiconductor optical amplifier does not occur, on the basis of at least the second power, wherein the optical filter is configured to separate the third optical signal into: a fourth optical signal obtained by suppressing the outside portion of the wavelength band of the first optical signal in the third optical signal; and a fifth optical signal obtained by extracting the outside portion of the wavelength band of the first optical signal in the third optical signal, and
wherein the controller has stored therein a correspondence relationship between power of the second optical signal and a photoelectric current obtained by detecting the fifth optical signal.

Assignees

• Sumitomo Electric Industries

Inventors

• Tanaka Naruto
• Funada Tomoyuki

Classifications

• H04B10/25891

  Transmission components (H04B10/40 takes precedence) · CPC title

• H04B10/272

  Star-type networks {or tree-type networks} · CPC title

• H04B10/07955

  Monitoring or measuring power · CPC title

• H04B10/673

  using an optical preamplifier · CPC title

• H04B10/0797

  Monitoring line amplifier or line repeater equipment · CPC title