期刊
OPTICS EXPRESS
卷 24, 期 1, 页码 687-698出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.24.000687
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资金
- Air Force Office of Scientific Research [FA9550-12-1-0236, FA9550-15-1-0211]
- DARPA PULSE program from AMRDEC [W31P40-13-1-0018]
- National Science Foundation [ECCS-1509578]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1509578] Funding Source: National Science Foundation
Microresonator based Kerr frequency comb generation has many attractive features, including ultrabroad spectra, chip-level integration, and low power consumption. Achieving precise tuning control over the comb frequencies will be important for a number of practical applications, but has been little explored for microresonator combs. In this paper, we characterize the thermal tuning of a coherent Kerr frequency comb generated from an on-chip silicon nitride microring. When the microring temperature is changed by similar to 70 degrees C with an integrated microheater, the line spacing and center frequency of the comb are tuned respectively by -253 MHz (-3.57 MHz/degrees C) and by -175 GHz (-2.63 GHz/degrees C); the latter constitutes 75% of the comb line spacing. From these results we obtain a shift of 25 GHz (362.07 MHz/degrees C) in the comb carrier-envelope offset frequency. Numerical simulations are performed by taking into account the thermo-optic effects in the waveguide core and cladding. The temperature variation of the comb line spacing predicted from simulations is close to that observed in experiments. The time-dependent thermal response of the microheater based tuning scheme is characterized; time constants of 30.9 mu s and 0.71ms are observed. (C) 2015 Optical Society of America
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