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Generation of tunable, high repetition rate optical frequency combs using on-chip silicon modulators

TitleGeneration of tunable, high repetition rate optical frequency combs using on-chip silicon modulators
Publication TypeJournal Article
Year of Publication2018
AuthorsNagarjun, KP, Jeyaselvan, V, Selvaraja, SKumar, Supradeepa, VR
JournalOptics express
Volume26
Pagination10744–10753
Abstract

We experimentally demonstrate tunable, highly-stable frequency combs with high repetition-rates using a single, charge injection based silicon PN modulator. In this work, we demonstrate combs in the C-band with over eight lines in a 20-dB bandwidth. We demonstrate continuous tuning of the center frequency in the C-band and tuning of the repetition-rate from 7.5GHz to 12.5GHz. We also demonstrate through simulations the potential for bandwidth scaling using an optimized silicon PIN modulator. We find that the time varying free carrier absorption due to carrier injection, an undesirable effect in data modulators, assists here in enhancing flatness in the generated combs.

DOI10.1364/OE.26.010744