Abstract-Mode-locked semiconductor lasers which incorporate multiple contacting segments are found to give improved performance over single-segment designs. The functions of gain, saturable absorption, gain modulation, repetition rate tuning, wavelength tuning, and electrical pulse generation can be integrated on a single semiconductor chip. The optimization of the performance of multisegment mode-locked lasers in terms of material parameters, waveguiding parameters, electrical parasitics, and segment length is discussed experimentally and theoretically.

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RF drive frequency from an actively modelocked fibre ring laser without controlling the modulator bias. In general, whenever the RF drive frequency is detuned by an amount equal to fwl2, from the frequency where stable pulses are found, the laser would produce pulses at repetition rate two times the RF drive frequency.Similarly, when detuning is -:fc 4 vf3, then the repetition rate of output pulses can be tripled.

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