Ultrafast switch-on dynamics of frequency-tuneable semiconductor lasers

Iman Kundu (), Feihu Wang, Xiaoqiong Qi, Hanond Nong, Paul Dean, Joshua R. Freeman, Alexander Valavanis, Gary Agnew, Andrew T. Grier, Thomas Taimre, Lianhe Li, Dragan Indjin, Juliette Mangeney, Jérôme Tignon, Sukhdeep S. Dhillon, Aleksandar D. Rakić, John E. Cunningham, Edmund H. Linfield and A. Giles Davies
Additional contact information
Iman Kundu: University of Leeds
Feihu Wang: CNRS
Xiaoqiong Qi: The University of Queensland
Hanond Nong: CNRS
Paul Dean: University of Leeds
Joshua R. Freeman: University of Leeds
Alexander Valavanis: University of Leeds
Gary Agnew: The University of Queensland
Andrew T. Grier: University of Leeds
Thomas Taimre: The University of Queensland
Lianhe Li: University of Leeds
Dragan Indjin: University of Leeds
Juliette Mangeney: CNRS
Jérôme Tignon: CNRS
Sukhdeep S. Dhillon: CNRS
Aleksandar D. Rakić: The University of Queensland
John E. Cunningham: University of Leeds
Edmund H. Linfield: University of Leeds
A. Giles Davies: University of Leeds

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Single-mode frequency-tuneable semiconductor lasers based on monolithic integration of multiple cavity sections are important components, widely used in optical communications, photonic integrated circuits and other optical technologies. To date, investigations of the ultrafast switching processes in such lasers, essential to reduce frequency cross-talk, have been restricted to the observation of intensity switching over nanosecond-timescales. Here, we report coherent measurements of the ultrafast switch-on dynamics, mode competition and frequency selection in a monolithic frequency-tuneable laser using coherent time-domain sampling of the laser emission. This approach allows us to observe hopping between lasing modes on picosecond-timescales and the temporal evolution of transient multi-mode emission into steady-state single mode emission. The underlying physics is explained through a full multi-mode, temperature-dependent carrier and photon transport model. Our results show that the fundamental limit on the timescales of frequency-switching between competing modes varies with the underlying Vernier alignment of the laser cavity.

Date: 2018
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DOI: 10.1038/s41467-018-05601-x

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