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Authors: Z. Wang, K. Van Gasse, V. Moskalenko, S. Latkowski, E. Bente, B. Kuyken, G. Roelkens
Title: A III-V-on-Si ultra dense comb laser
Format: International Journal
Publication date: 5/2017
Journal/Conference/Book: Light: Science & Applications
Volume(Issue): 6 p.e16260
DOI: 10.1038/lsa.2016.260
Citations: 123 ( - last update: 7/7/2024)
101 (OpenCitations - last update: 27/6/2024)
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Optical frequency combs emerge as a promising technology that enable highly sensitive, near real-time spectroscopy with high resolution. While the currently available comb generators are mostly based on bulky and high cost femtosecond lasers for dense comb generation (line spacing in the range of 100 MHz to 1 GHz), their integrated and low-cost counterparts, integrated semiconductor mode-locked lasers, are limited by their large comb spacing, small number of lines and broad optical linewidth. In this paper, we report the demonstration of an integrated dense optical frequency comb generator based on a IIIV-on-Si mode-locked laser. The use of low-loss passive silicon waveguides enables the integration of a long laser cavity, which allows the laser to be passive mode-locked at a record low 1 GHz repetition rate. The 12 nm 10-dB output optical spectrum together with the very small optical mode spacing result in a dense optical comb that consists of over 1400 equally spaced optical lines. The sub-kHz 10 dB radio frequency linewidth and the narrow longitudinal mode linewidth (1 MHz) indicate very stable mode-locking. Such integrated dense optical frequency comb generators are very promising e.g. for high-resolution and real-time spectroscopy applications.

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