InP femtosecond mode-locked laser in a compound feedback cavity with a switchable repetition rate
Mu-Chieh Lo, Robinson Guzm\'an, and Guillermo Carpintero
TL;DR
This paper presents a monolithically integrated InP femtosecond mode-locked laser with a compound feedback cavity that can switch between different repetition rates from 50 to 450 GHz, producing ultrashort pulses under 0.3 ps.
Contribution
It introduces a novel integrated laser design combining a colliding pulse and a Fabry-Perot cavity for tunable harmonic mode locking.
Findings
Achieved tunable optical mode spacing from 50 to 450 GHz.
Generated ultrafast pulses shorter than 0.3 ps.
Demonstrated on-chip switchable repetition rate.
Abstract
A monolithically integrated mode-locked semiconductor laser is proposed. The compound ring cavity is composed of a colliding pulse mode-locking (ML) subcavity and a passive Fabry-Perot feedback subcavity. These two 1.6 mm long subcavities are coupled by using on-chip reflectors at both ends, enabling harmonic mode locking. By changing DC-bias conditions, optical mode spacing from 50 to 450 GHz is experimentally demonstrated. Ultrafast pulses shorter than 0.3 ps emitted from this laser diode are shown in autocorrelation traces.
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