Kavli Affiliate: Kerry Vahala
| First 5 Authors: Long Cheng, Mengdi Zhao, Yang He, Yu Zhang, Roy Meade
| Summary:
In recent years, miniaturization and integration of photonic microwave
oscillators by optical frequency division approach have witnessed rapid
progress. In this work, we report on-chip low phase noise photonic microwave
generation based on a planar chip design. Dual lasers are co-locked to a
silicon nitride spiral resonator and their relative phase noise is measured
below the cavity thermal noise limit, resulting in record low on-chip relative
optical phase noise. A broadband integrated electro-optic comb up to 3.43 THz
(27 nm) bandwidth is utilized to divide down the relative phase noise of the
spiral resonator referenced lasers to the microwave domain. All-around
record-low phase noise is achieved for planar chip-based photonic microwave
oscillators from 10 Hz to 10 kHz offsets. The planar chip design, high
technology-readiness level, foundry-ready processing, combined with the
exceptional phase noise performance for our work represent a major advance of
integrated photonic microwave oscillators.
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