Kavli Affiliate: Kerry Vahala
| First 5 Authors: Yang He, Long Cheng, Heming Wang, Yu Zhang, Roy Meade
| Summary:
Optical frequency division based on bulk or fiber optics provides
unprecedented spectral purity for microwave oscillators. To extend the
applications of this approach, the big challenges are to develop miniaturized
optical frequency division oscillators without trading off phase noise
performance. In this paper, we report a chip-scale electro-optical frequency
division microwave oscillator with ultra-low phase noise performance. Dual
laser sources are co-self-injection-locked to a single silicon nitride spiral
resonator to provide a record high-stability, fully on-chip optical reference.
An integrated electro-optical frequency comb based on a novel thin-film lithium
niobate phase modulator chip is incorporated for the first time to perform
optical-to-microwave frequency division. The resulting chip-scale photonic
microwave oscillator achieves a phase noise level of -129 dBc/Hz at 10 kHz
offset for 37.7 GHz carrier. The results represent a major advance in high
performance, integrated photonic microwave oscillators for applications
including signal processing, radar, timing, and coherent communications.
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