Kavli Affiliate: Kerry J. Vahala
| First 5 Authors: Haotian Cheng, Chao Xiang, Naijun Jin, Igor Kudelin, Joel Guo
| Summary:
Compact photonic systems that offer high frequency stability and low noise
are of increasing importance to applications in precision metrology, quantum
computing, communication, and advanced sensing technologies. However, on-chip
resonators comprised of dielectrics cannot match the frequency stability and
noise characteristics of Fabry-Perot cavities, whose electromagnetic modes live
almost entirely in vacuum. In this study, we present a novel strategy to
interface micro-fabricated Fabry-Perot cavities with photonic integrated
circuits to realize compact, high-performance integrated systems. Using this
new integration approach, we demonstrate self-injection locking of an on-chip
laser to a milimeter-scale vacuum-gap Fabry-Perot using a circuit interface
that transforms the reflected cavity response to enable efficient feedback to
the laser. This system achieves a phase noise of -97 dBc/Hz at 10 kHz offset
frequency, a fractional frequency stability of 5*10-13 at 10 ms, a 150 Hz 1/pi
integral linewidth, and a 35 mHz fundamental linewidth. We also present a
complementary integration strategy that utilizes a vertical emission grating
coupler and a back-reflection cancellation circuit to realize a fully
co-integrated module that effectively redirects the reflected signals and
isolates back-reflections with a 10 dB suppression ratio, readily adaptable for
on-chip PDH locking. Together, these demonstrations significantly enhance the
precision and functionality of RF photonic systems, paving the way for
continued advancements in photonic applications.
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