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Self-mode-locking in a high-power hybrid silicon nitride integrated laser

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Abstract

Integrated mode-locked lasers are useful tools in microwave photonic applications as a local oscillator. In particular, hybrid integrated lasers could easily be integrated with passive processing circuits. In this Letter, we report on the self-mode-locking of a hybrid integrated laser comprising two indium phosphide gain sections and a silicon nitride feedback circuit that filters light using two ring resonators. The hybrid laser is shown to mode-lock and to have a mostly frequency-modulated field in the cavity using a stepped-heterodyne optical complex spectrum analysis. A mostly frequency modulated field output is good for high powers per line due to a more continuous emission, compared with mode-locked lasers using a saturable absorber; additionally, the filter limits the bandwidth of the comb, condensing the power to the fewer comb lines.

© 2021 Optical Society of America

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Supplementary Material (1)

NameDescription
Supplement 1       Expression for the transfer function of the cavity, tunability range of the MLL repetition rate, and extended figures of the phase response and time traces at all output ports.

Data availability

Data underlying the results presented in this paper are available in Ref. [27].

27. Y. Klaver, J. P. Epping, C. G. H. Roeloffzen, and D. A. I. Marpaung, “Intracavity time-domain characterisation of a high-power hybrid integrated laser in mode-locked operation,” 4TU.ResearchData, 17 December 2021, https://dx.doi.org/10.4121/15074172.

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Equations (2)

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