Short-length homodyne interferometer for self-stabilization of an optical frequency comb
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Cahill, James P., Weimin Zhou, and Curtis R. Menyuk. “Short-Length Homodyne Interferometer for Self-Stabilization of an Optical Frequency Comb.” In 2017 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS), 425–26, 2017. https://doi.org/10.1109/FCS.2017.8088912.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
We stabilized the repetition rate of an optical frequency comb with a self-referenced phase-locked loop that used a short-path-length fiber-optic interferometer to generate its error signal. In this work, we used a homodyne interferometer instead of a heterodyne interferometer, so that the architecture of the phase-locked loop was simpler than our previous implementation. We used the stabilized repetition rate to generate a 10-GHz signal with a phase noise of -120 dBc/Hz at an offset frequency of 1 kHz. The simplified architecture and the short path length imbalance of the interferometer would allow it to be fabricated on an all-passive silicon chip and may lead to a chip-scale optical frequency comb with an ultra-low-noise repetition rate.