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Octave-spanning frequency comb generation in a silicon nitride chip

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Abstract

We demonstrate a frequency comb spanning an octave via the parametric process of cascaded four-wave mixing in a monolithic, high-Q silicon nitride microring resonator. The comb is generated from a single-frequency pump laser at 1562nm and spans 128THz with a spacing of 226GHz, which can be tuned slightly with the pump power. In addition, we investigate the RF amplitude noise characteristics of the parametric comb and find that the comb can operate in a low-noise state with a 30dB reduction in noise as the pump frequency is tuned into the cavity resonance.

© 2011 Optical Society of America

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