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.
It is very important to generate high-speed optical synchronization signal for high speed computer. The rational harmonic (RH) modelocking scheme is a useful technology to generate pulses at a repetition rate higher than the modulation frequency. Such a technique can vary the clock rate of the synchronous optical signal in future high speed computer backplane for optical clock distribution. In this paper, we demonstrate an variable RH active modelocking light signal technique using a figure eight fiber cavity (F8C) incorporating a nonlinear amplifier loop mirror (NALM) using phase modulator to generate high repetition rate optical pulses above 10 GHz.