US 2021/0344163 A1Published application

Method, Device And System For Dynamically Controlling Gain Of Raman Optical Fiber Amplifier

AssigneeAccelink Technologies Co., Ltd.

InventorsCuihong ZHANG, Chengpeng FU, Jintao TAO, Hao ZHANG, Lijing CHENG

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Abstract

Disclosed are a method, device and system for dynamically controlling a gain of a Raman optical fiber amplifier. The method comprises: determining whether a target gain falls within a gain mask range; if the target gain falls within the gain mask range, directly locking a gain to the target gain; and if the target gain falls outside the gain mask range, locking the gain to a corresponding maximum gain in the gain mask range, and gradually increasing the locked gain according to a preset first step length until the target gain is reached or until at least one pump laser reaches a maximum output power. The invention enables an optical fiber amplifier to respond quickly to a change in an input optical signal, ensures gain stability, and ensures that no power overshoot or undershoot occurs in the non-switched optical channels in an optical path. Moreover, the invention minimizes an amount of time required to complete switching between gains.

Claims12

Dependent claims

A system for dynamically controlling a gain of a Raman optical fiber amplifier, comprising the Raman optical fiber amplifier consisting of one or more pump lasers, a central processing unit for controlling an operation state of the one or more pump lasers, and an out-of-band ASE detection circuit and an output power detection circuit provided corresponding to the Raman optical fiber amplifier, control circuits of the pump lasers, the out-of-band ASE detection circuit and the output power detection circuit being respectively connected to the central processing unit, characterized in that the system is configured to:

make input signal optical power amplified by the Raman optical fiber amplifier at maximum input power when pumping is off and set, by the central processing unit, output optical power of all the pump lasers to maximum output power, so as to obtain a current gain GM and a current gain slope tiltM of the Raman amplifier;
maintain the output optical power of a specified first pump laser at the maximum output power and adjust the output optical power of pump lasers of other wavelengths to make a gain slope of the amplifier reach a minimum slope, thereby obtaining a corresponding Raman gain GNM and a corresponding gain slope tiltNM;
maintain the output optical power of a specified second pump laser at the maximum output power and adjust the output optical power of pump lasers of other wavelengths to make the gain slope of the amplifier reach a maximum slope, thereby obtaining a corresponding Raman gain GPM and a corresponding gain slope tiltPM;
by using the gain slope as a first dimension parameter and the gain as a second dimension parameter, fit (tiltNM, GNM) and (tiltM, GM) to obtain KN as K and BN as B in a gain calculation formula in a case of tilt<tiltM, and fit (tiltM, GM) and (tiltPM, GPM) to obtain Kp as K and Bp as B in the gain calculation formula in a case of tilt≥tiltM, wherein the gain calculation formula is G=K*Tilt+B;
calculate maximum gains G corresponding to all the tilts of the Raman optical fiber amplifier, and form a GAIN MASK model by using the calculated maximum gains G.

2 more elements

A method for dynamically controlling a gain of a Raman optical fiber amplifier, characterized in comprising:

setting output optical power of all pump lasers to maximum output pump power to obtain a current gain GM and a current gain slope tiltM of the Raman amplifier;
maintaining the output optical power of a specified first pump laser at the maximum output power and adjusting the output optical power of pump lasers of other wavelengths to make a gain slope of the amplifier reach a minimum slope, thereby obtaining a corresponding Raman gain GNM and a corresponding gain slope tiltNM;
maintaining the output optical power of a specified second pump laser at the maximum output power and adjusting the output optical power of pump lasers of other wavelengths to make the gain slope of the amplifier reach a maximum slope, thereby obtaining a corresponding Raman gain GPM and a corresponding gain slope tiltPM;
by using the gain slope as a first dimension parameter and the gain as a second dimension parameter, fitting (tiltNM, GNM) and (tiltM, GM) to obtain KN as K and BN as B in a gain calculation formula in a case of tilt<tiltM, and fitting (tiltM, GM) and (tiltPM, GPM) to obtain Kp as K and Bp as B in the gain calculation formula in a case of tilt≥tiltM, wherein the calculation formula is G=K*Tilt+B;
calculating maximum gains G corresponding to all the tilts of the Raman optical fiber amplifier, and forming a GAIN MASK model by using the calculated maximum gains G.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/273,574Filed 26 Dec 2018
Priority: CN 201811028093.34 Sep 2018
Published: 4 Nov 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H01S 3/13013
In optical amplifiers: by controlling the optical pumping
H01S 3/06754
Fibre lasers: fibre amplifiers
H01S 3/0912
Using optical pumping: electronics or drivers for the pump source, i.e. details of drivers or circuitry specific for laser pumping
H01S 3/094003
By coherent light: the pumped medium being a fibre

Family

US 12,074,407 B2Related patent
US 2021/0344163 A1This patent

From the US filing history. Foreign family members aren’t listed.

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