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20 September 2007 Pulse amplitude equalization of RHMLFL with nonlinear parameter consideration
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We design a high repetition rate tunable rational harmonic mode-locked fiber laser (RHMLFL). The gain media in the laser ring cavity is provided by an erbium-doped fiber amplifier. The output power of the EDFA can be adjusted to 17dBm. There are two isolators incorporated in the erbium-doped fiber amplifier to ensure the unidirectional operation of the ring laser. We modulated the high repetition rate to get the higher modulation frequency. We achieve a pulse level equalized tunable rational harmonic mode-locked fiber laser (RHMLFL). The pulse amplitude of pulse train is equalized by operating at nonlinear modulation transfer function region of active modulator in RHMLFL. Without adding any other additional predistortion components, amplitude equalized short pulses up to the fourth order rational harmonic mode-locking are successfully demonstrated for 10 GHz. One can extend such a method for various mode-locked lasers even with much higher repetition rates. In this paper, we successfully to renew the systematic structure to generate the high frequency laser output pulse train of 50GHz. Then optical pulse compressing by sixth order solitonic effect is simulated. Pulsewidth variation versus compressor length for high order solitonic effect compression is analyzed. In our previous work, the output pulse is 28 ps with repetition rate 10 GHz. The shortest pulsewidth can be demonstrated compressed below 1.53 ps using solitonic technique.
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Li-Chiang Hu, Nan-Hsin Liu, and Shyh-Lin Tsao "Pulse amplitude equalization of RHMLFL with nonlinear parameter consideration", Proc. SPIE 6695, Optics and Photonics for Information Processing, 66950V (20 September 2007);

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