Bandwidth scaling of silicon modulator-based combs using multi-carriers and frequency offset locking

Nagarjun, KP and Prakash, R and Vikram, BS and Arora, S and Jeyaselvan, V and Selvaraja, SK and Supradeepa, VR (2020) Bandwidth scaling of silicon modulator-based combs using multi-carriers and frequency offset locking. In: OSA Continuum, 3 (4). pp. 921-928.

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Abstract

Optical frequency combs can be generated on-chip in silicon modulators through large signal modulation of an optical carrier. In this paper, a technique for bandwidth scale frequency combs generated from linear silicon modulators is proposed and experimentally demonstrated. This is accomplished by locking two frequency combs using a heterodyne optical frequency locked loop. We demonstrate here a proof of concept experiment of bandwidth-scaling of optical frequency combs generated in a silicon PN-modulator by frequency locking two 10 GHz repetition rate combs (6 lines each, 20-dB bandwidth), individually generated from two lasers offset by 50 GHz to each other using their respective overlapping comb lines. The resultant beat signal is stabilized at a heterodyne offset of 75 MHz to within a 3 dB linewidth of 4.305 MHz to achieve a bandwidth-scaled composite comb with 11 lines. © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Item Type:	Journal Article
Publication:	OSA Continuum
Publisher:	The Optical Society
Additional Information:	The copyright for this article belongs to The Optical Society
Keywords:	Bandwidth; Frequency allocation; Heterodyning; Locks (fasteners); Natural frequencies; Optical materials; Optical signal processing; Silicon, Bandwidth scaling; Frequency locking; Frequency offsets; Large-signal modulation; Optical frequency combs; Optical frequency-locked loops; Scaled composites; Silicon modulators, Light modulators
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	23 Jul 2021 11:33
Last Modified:	23 Jul 2021 11:33
URI:	http://eprints.iisc.ac.in/id/eprint/68981

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