Analysis of the phase-locking dynamics of a III-V-on-silicon frequency comb laser

Abstract

We present the detailed characterization of the phase dynamics of a telecom hybrid III-V-on-silicon passively mode-locked laser with a ring cavity. We explore the various regimes of operation as a function of gain current and saturable absorber bias voltage. We use a stepped-heterodyne measurement to quantify the spectral chirp and reconstruct the pulse envelope. With this technique, we are able to identify regimes of near-transform-limited operation, and we assess the degradation of mode-locking in the comb phase relationship when saturable absorber bias voltage is changed. Finally, we present a preliminary study of the phase-locking in hybrid mode-locked operation and demonstrate transform-limited pulses.

Analysis of the phase-locking dynamics of a III-V-on-silicon frequency comb laser

“…In conclusion, we have presented the first SH analysis of the mode-locking operation of a III-V-on-Si frequency comb laser [5]. At difference with nonlinear autocorrelations, SH is a linear technique, perfectly suited for low-power sources.…”

Generation of tunable and broadband optical frequency comb based on gain-switching vertical-cavity surface-emitting laser driven by square wave signal under optical injection

“…It has been widely applied in arbitrary waveform generator 2,3 , optical metrology 4,5 , optical wavelength division multiplexing [6][7][8] , and other frontier fields. At present, OFC generation approaches mainly include laser mode locking technology 8 , micro ring resonance 9 , electro-optic modulator 10,11 , and gain-switching laser [12][13][14] . Especially, the scheme for generating OFC based on a gain-switching laser has received extensive attention due to the advantages of a relatively simple experimental system and easily tunable comb spacing.…”