Highly-sensitive sonogram for assessment of chirp in semiconductor mode-locked lasers

Stolarz, Piotr Michal and Mezosi, Gábor and Strain, Michael John and Bryce, Ann Catrina and Sorel, Marc (2012) Highly-sensitive sonogram for assessment of chirp in semiconductor mode-locked lasers. IEEE Journal of Quantum Electronics, 48 (8). pp. 995-1003. ISSN 0018-9197

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Abstract

We report on the detailed characterization of ultrashort pulses emitted from a 1.5- AlGaInAs/InP semiconductor passively mode-locked laser, operating at a repetition frequency of 35 GHz. Both the temporal and phase profiles of the pulses are retrieved using a sonogram technique that utilizes a highly-sensitive two-photon absorption waveguide detector. The system enables full characterization of pulses with energy as low as 10 fJ and peak power level of 5 mW, which is only inaccessible by a limited number of high-sensitivity measurement approaches. We show that the pulses exhibit a prevailing positive linear chirp across a wide range of biasing conditions. Its high sensitivity to the gain section current proves the dominant contribution of the gain conditions to the group delay characteristics of the emitted pulses.

ORCID iDs

Stolarz, Piotr Michal, Mezosi, Gábor, Strain, Michael John ORCID logoORCID: https://orcid.org/0000-0002-9752-3144, Bryce, Ann Catrina and Sorel, Marc;