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Microwave power induced resonance shifting of silicon ring modulators for continuously tunable, bandwidth scaled frequency combs

TitleMicrowave power induced resonance shifting of silicon ring modulators for continuously tunable, bandwidth scaled frequency combs
Publication TypeJournal Article
Year of Publication2020
AuthorsNagarjun, KP, Raj, P, Jeyaselvan, V, Selvaraja, SKumar, Supradeepa, VR
JournalOptics Express
Volume28
Pagination13032–13042
Abstract

We demonstrate a technique to continuously tune center frequency and repetition rate of optical frequency combs generated in silicon microring modulators and bandwidth scale them. We utilize a drive frequency dependent, microwave power induced shifting of the microring modulator resonance. In this work, we demonstrate center frequency tunability of frequency combs generated in silicon microring modulators over a wide range (∼8nm) with fixed number of lines. We also demonstrate continuously tunable repetition rates from 7.5GHz to 15GHz. Further, we use this effect to demonstrate a proof-of-principle experiment to bandwidth scale an 8-line (20dB band) comb generated from a single ring modulator driven at 10GHz to a comb with 12 and 15 lines by cascading two and three ring modulators, respectively. This is accomplished by merging widely spaced ring modulator resonances to a common location, thus coupling light simultaneously into multiple cascaded ring modulators.

URLhttps://doi.org/10.1364/OE.386810