US 12,074,407 B2
Method, device and system for dynamically controlling gain of Raman optical fiber amplifier
Cuihong Zhang, Wuhan (CN); Chengpeng Fu, Wuhan (CN); Jintao Tao, Wuhan (CN); Hao Zhang, Wuhan (CN); and Lijing Cheng, Wuhan (CN)
Assigned to Accelink Technologies Co., Ltd., Wuhan (CN)
Appl. No. 17/273,574
Filed by Accelink Technologies Co., Ltd, Wuhan (CN)
PCT Filed Dec. 26, 2018, PCT No. PCT/CN2018/123701
§ 371(c)(1), (2) Date Mar. 4, 2021,
PCT Pub. No. WO2020/048052, PCT Pub. Date Mar. 12, 2020.
Claims priority of application No. 201811028093.3 (CN), filed on Sep. 4, 2018.
Prior Publication US 2021/0344163 A1, Nov. 4, 2021
Int. Cl. H01S 3/13 (2006.01); H01S 3/067 (2006.01); H01S 3/091 (2006.01); H01S 3/094 (2006.01); H01S 3/10 (2006.01); H01S 3/30 (2006.01)
CPC H01S 3/13013 (2019.08) [H01S 3/06754 (2013.01); H01S 3/0912 (2013.01); H01S 3/094003 (2013.01); H01S 3/094096 (2013.01); H01S 3/10069 (2013.01); H01S 3/302 (2013.01); H01S 2301/02 (2013.01)] 11 Claims
OG exemplary drawing
 
1. 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.