Browsing by Author "Sykes, Patrick G."
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Item Low-Phase-Noise Microwave Generated by an Optical Frequency Comb Locked to an On-Chip Interferometer(IEEE, 2023-10-09) Cahill, James P.; Mahmood, Tanvir; Zhou, Weimin; Sykes, Patrick G.; Menyuk, CurtisWe generated a low-phase-noise microwave by stabilizing an optical frequency comb with a 56.5-cm long photonic-integrated Mach-Zehnder interferometer that was fabricated in a commercial foundry. The phase noise of the 9.987-GHz tone was −105 dBc/Hz at a 1-kHz offset frequency, corresponding to a reduction of the free-running phase noise by 15 dB. Our results point towards a fully integrated low-phase-noise microwave source.Item Response Function of Homodyne Wavelength Difference Stabilization(IEEE, 2022-08-15) Cahill, James P.; Mahmood, Tanvir; Sykes, Patrick G.; Zhou, Weimin; Menyuk, CurtisWe measured the response function at wavelengths of 1540 nm and 1560 nm of an 8-m homodyne interferometer to modulations of the repetition rate and carrier-envelope offset frequency (f꜀ₑₒ ) of an optical frequency comb (OFC). It is known that subtracting the response at one wavelength from the other generates an error signal free of f꜀ₑₒ noise, forming a wavelength difference stabilization (WDS) interferometer that may stabilize non-octave-spanning OFCs. We calculate the WDS response function from our data, and find that while the sensitivity is expected to match a heterodyne system, changes in the response function of a homodyne WDS interferometer due to large-scale drifts of f꜀ₑₒ pose a challenge to robustly stabilize an OFC.