Method and device for determining input optical power

Patent metadata

Field	Value
Publication number	US-9467224-B2
Application number	US-201414563369-A
Country	US
Kind code	B2
Filing date	Dec 8, 2014
Priority date	Dec 19, 2013
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

A method and a device for determining an input optical power are provided. The method include: after determining a bias current value of an optical amplifier unit when the optical amplifier unit amplifies a target optical signal and a voltage value output after an optical receiving unit converts the amplified target optical signal into an electrical signal, determining, according to a predetermined first correspondence that is among a bias current value, a voltage value, and an input optical power value and corresponds to a wavelength of the target optical signal, an input optical power value corresponding to the determined bias current value and the determined voltage value. By using the solution in the embodiments of the present invention, an input optical power of an optical signal on which optical amplification is performed can be determined.

First claim

What is claimed is:

1. A method for determining an input optical power in an optical transmission device, the method comprising:
determining, by a processor, a bias current value of an optical amplifier unit when the optical amplifier unit amplifies a first optical signal to an amplified first optical signal, wherein the first optical signal comprises a target optical signal;
determining, by the processor, a voltage value output after an optical receiving unit converts the target optical signal in the amplified first optical signal into an electrical signal, wherein the voltage value is a voltage value corresponding to the target optical signal in the amplified first optical signal; and
determining, by the processor, according to a predetermined correspondence that is among a bias current value, a voltage value, and an input optical power value that correspond to a wavelength of the target optical signal, an input optical power value corresponding to the bias current value and the voltage value.

2. The method according to claim 1 , wherein predetermining the correspondence that is among the bias current value, the voltage value, and the input optical power value that correspond to the wavelength of the target optical signal comprises:
for at least two bias current values of the optical amplifier unit when the optical amplifier unit amplifies a second optical signal, separately determining, under each of the at least two bias current values, an input optical power value and a voltage value that correspond to a wavelength of the target optical signal comprised in the second optical signal; and
establishing, according to the input optical power value and the voltage value that are determined under each of the at least two bias current values and correspond to the wavelength of the target optical signal comprised in the second optical signal, the correspondence corresponding to the wavelength of the target optical signal;
wherein the second optical signal comprises the target optical signal, and the voltage value corresponding to the wavelength of the target optical signal is a voltage value output after the optical receiving unit converts the target optical signal amplified by the optical amplifier unit into an electrical signal.

3. The method according to claim 2 , wherein the separately determining, under each of the at least two bias current values, the input optical power value and the voltage value that correspond to the wavelength of the target optical signal comprised in the second optical signal comprises:
under each of the at least two bias current values, separately determining at least two input optical power values of the target optical signal after the optical amplifier unit amplifies the target optical signal, and separately determining at least two voltage values output after the optical receiving unit converts the target optical signal amplified by the optical amplifier unit into an electrical signal; and
performing interpolation processing or fitting processing on the separately determined at least two input optical power values and at least two voltage values, so as to obtain the input optical power value and the voltage value that correspond, under each of the at least two bias current values, to the wavelength of the target optical signal.

4. The method according to claim 2 , wherein the establishing, according to the input optical power value and the voltage value that are determined under each of the at least two bias current values and correspond to the wavelength of the target optical signal comprised in the second optical signal, the correspondence corresponding to the wavelength of the target optical signal comprises:
performing interpolation processing or fitting processing on all input optical power values and all voltage values that are determined under each of the at least two bias current values and correspond to the wavelength, so as to obtain the correspondence corresponding to the wavelength.

5. An optical transmission device, comprising:
an optical amplifier;
an optical receiving unit; and
a processor, configured to:
determine a bias current value of the optical amplifier when the optical amplifier amplifies a first optical signal to an amplified first optical signal, wherein the first optical signal comprises a target optical signal;
determine a voltage value output after the optical receiving unit converts the target optical signal in the amplified first optical signal into an electrical signal, wherein the voltage value is a voltage value corresponding to the target optical signal in the amplified first optical signal; and
determine, according to a predetermined correspondence that is among a bias current value, a voltage value, and an input optical power value that corresponds to a wavelength of the target optical signal, an input optical power value corresponding to the bias current value and the voltage value.

6. The optical transmission device according to claim 5 , wherein the determining the correspondence comprises:
for at least two bias current values of the optical amplifier unit when the optical amplifier amplifies a second optical signal, separately determining, under each of the at least two bias current values, an input optical power value and a voltage value that correspond to a wavelength of the target optical signal comprised in the second optical signal; and
establishing, according to the input optical power value and the voltage value that are determined under each of the at least two bias current values and correspond to the wavelength of the target optical signal comprised in the second optical signal, the correspondence corresponding to the wavelength of the target optical signal;
wherein the second optical signal comprises the target optical signal, and the voltage value corresponding to the wavelength of the target optical signal is a voltage value output after the optical receiving unit converts the target optical signal amplified by the optical amplifier into an electrical signal.

7. The optical transmission device according to claim 6 , wherein the processor is further configured to:
under each of the at least two bias current values, separately determine at least two input optical power values of the target optical signal after the optical amplifier amplifies the target optical signal, and separately determine at least two voltage values output after the optical receiving unit converts the target optical signal amplified by the optical amplifier into an electrical signal; and
perform interpolation processing or fitting processing on the separately determined at least two input optical power values and at least two voltage values, so as to obtain the input optical power value and the voltage value that correspond, under each of the at least two bias current values, to the wavelength of the target optical signal.

8. The optical transmission device according to claim 6 , wherein the processor is further configured to:
perform interpolation processing or fitting processing on all input optical power values and voltage values that are determined under each of the at least two bias current values and correspond to the wavelength, so as to obtain the correspondence corresponding to the wavelength.

Assignees

• Huawei Tech Co Ltd

Inventors

• Qi Ming

Classifications

• H04B10/07955 Primary

  Monitoring or measuring power · CPC title

• H04B10/0799

  Monitoring line transmitter or line receiver equipment · CPC title

• H04B10/6911

  Photodiode bias control, e.g. for compensating temperature variations · CPC title

• H04B10/6931

  Automatic gain control of the preamplifier · CPC title