Vol. 225, Issue 9, September 2018, pp. 56-62

Abstract: In this paper, for optical sampling based on the generalized sampling theorem, non-uniformly spaced, low time-jitter, quasi-Fourier transform optical short pulse generation from a gain switching laser diode (GS-LD) is investigated. Proof- in-principle experiments showed that precise control of carrier density in a GS-LD, namely the use of precisely tailored driving current, made generation of non-uniformly spaced optical pulses possible. Further precise tailoring of the driving current enabled the control of the non-uniformly spaced optical short pulses, i.e. the number of successive pulses in a pulse group, pulse interval in a pulse group, and the pulse group period. Amplitude enhancement, RMS time-jitter reduction, and pulse shortening by introducing self-seeding, optical band-pass filtering, and dispersion compensation are also reported. As a result, non-uniformly spaced optical short pulse generation including twin/triple pulses with 25 ps of the full-width half the maximum, 2.5 ps RMS time-jitter, and 500 ps pulse interval has been experimentally demonstrated.

Keywords: Optical sampling, Generalized sampling theorem, Non-uniformly spaced optical short pulses, Gain-switching, Self-seeding, Time-jitter.

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