Nagarjun, KP and Raj, P and Jeyaselvan, V and Selvaraja, SK and Supradeepa, VR (2019) Observation of novel optical and microwave power dependent effects in silicon micro-ring modulator based frequency comb generators. In: Laser Resonators, Microresonators, and Beam Control XXI 2019, 4 - 7 February 2019, San Francisco.
Full text not available from this repository.Abstract
The generation of on-chip optical frequency combs in silicon-based charge injection modulators through strong phase modulation has been investigated as a prospective source for on-chip wavelength division multiplexing (WDM). Being CMOS-fabrication compatible, these modulators are easily integrated with other silicon photonic components. Resonant structure based implementations using PN-doped silicon micro-ring modulators have been used to generate frequency combs. However, in contrast to linear modulators, the use of such resonant structures leads to resonance shifts resulting from microwave induced thermal effects as well as causing a degradation in the quality of the modulator resonance. In this work, we report and investigate interesting effects observed as the optical and microwave power driving the comb generator is changed. We utilize a comb generator operating at a repetition rate of 10GHz and driven by optical powers in the range of 3mW to 30mW and microwave power in the range of 6dBm to 25dBm. We observe novel effects wherein the skewness of the comb envelope, the number of comb lines generated varies in a non-monotonic function with changes in optical power and DC bias. Abrupt transitions are reported from a broadband comb to no comb generation conditions with slight changes to drive RF powers. We attribute the variations to an interplay between the thermo-optic effects in the ring and its impact in moving the resonance of the ring with changing power. © SPIE. Downloading of the abstract is permitted for personal use only.
| Item Type: | Conference Paper |
|---|---|
| Publication: | Proceedings of SPIE - The International Society for Optical Engineering |
| Publisher: | SPIE |
| Additional Information: | The copyright for this article belongs to SPIE. |
| Keywords: | Frequency modulation; Laser resonators; Microelectromechanical devices; Microwave generation; Natural frequencies; Optical communication; Optical materials; Optical signal processing; Photonic devices; Resonators; Silicon photonics, Micro resonators; On chips; Optical frequency combs; Silicon ring; Thermooptics, Light modulators |
| Department/Centre: | Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering |
| Date Deposited: | 22 Nov 2022 09:23 |
| Last Modified: | 22 Nov 2022 09:23 |
| URI: | https://eprints.iisc.ac.in/id/eprint/77955 |
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