A Programmable Mode-Locked Fiber Laser Using Phase-Only Pulse Shaping and the Genetic Algorithm

被引:7
|
作者
Karar, Abdullah S. [1 ]
Ghandour, Raymond [1 ]
Mahariq, Ibrahim [1 ]
Alboon, Shadi A. [1 ,2 ]
Maaz, Issam [1 ]
Neji, Bilel [1 ]
Barakat, Julien Moussa H. [1 ]
机构
[1] Amer Univ Middle East, Coll Engn & Technol, Kuwait, Kuwait
[2] Yarmouk Univ, Hijjawi Fac Engn Technol, Elect Engn Dept, Irbid 21163, Jordan
关键词
programmable mode-locked fiber lasers; phase-only pulse shaping; self-similar pulses; Kerr nonlinearity; Ginzburg-Landau equation; genetic algorithm; TIME-DOMAIN; FEMTOSECOND PULSES; OPTICAL PULSE; GENERATION; COMB;
D O I
10.3390/photonics7030069
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A novel, programmable, mode-locked fiber laser design is presented and numerically demonstrated. The laser programmability is enabled by an intracavity optical phase-only pulse shaper, which utilizes the same linearly chirped fiber Bragg grating (LC-FBG) from its two opposite ends to perform real-time optical Fourier transformation. A binary bit-pattern generator (BPG) operating at 20-Gb/s and producing a periodic sequence of 32 bits every 1.6 ns, is subsequently used to drive an optical phase modulator inside the laser cavity. Simulation results indicate stable programmable intensity profiles for each optimized user defined 32 code words. The laser operated in the self-similar mode-locking regime, enabling wave-breaking free operation. The programmable 32 bit code word targeting a specific intensity profile was determined using 100 generations of the genetic algorithm. The control of ultrashort pulse intensity profiles on the picosecond and femtosecond time scales is difficult. The process of stretching and compressing the pulse in the time domain allows for a slower BPG to impose a predefined phase modulation prior to pulse compression. This results in control over the fine features of the intensity profile of the compressed pulse on a picosecond or femtosecond time scale inside the laser cavity. The stability of the proposed scheme depends on the consistency and accuracy of the BPG rise and fall times in practice.
引用
收藏
页码:1 / 12
页数:12
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