Mapping ultrafast timing jitter in dispersion-managed 89 GHz frequency microcombs via self-heterodyne linear interferometry

Abstract

Laser frequency microcombs provide equidistant coherent frequency markers over a broad spectrum, enabling new frontiers in chip-scale frequency metrology, laser spectroscopy, dense optical communications, precision distance metrology and astronomy. Here we demonstrate thermally stabilized frequency microcomb formation in dispersion-managed microresonators at the different mode-locking states featured with the negligible center frequency shift and broad frequency bandwidth. Subsequently, femtosecond timing jitter in the microcombs are characterized, supported by precision metrology on the timing phase, relative intensity noise and instantaneous linewidth. We contrast the fundamental noise for a range of 89 GHz microcomb states, from soliton crystals to multiple solitons and single-soliton regimes, determined by pump-resonance detuning. For the single-soliton state, we report a close-to-shot-noise-limited relative intensity noise of -153.2 dB/Hz and a quantum-noise-limited timing jitter power spectral density of 0.4 as2/Hz, at 100 kHz offset frequency. This is enabled by a self-heterodyne linear interferometer with 94.2 zs/Hz1/2 timing resolution, 50.6 mHz/Hz1/2 RF frequency resolution, and 6.7 uV/Hz frequency discrimination sensitivity. We achieve an integrated timing jitter at 1.7 fs, integrated from 10 kHz to 1 MHz. Measuring and understanding the fundamental noise parameters in these high-clock-rate frequency microcombs are essential to advance soliton physics and precision microwave-optical clockwork.

References in corpus (28)

• Temporal solitons in optical microresonators
• Parallel convolution processing using an integrated photonic tensor core
• 11 TeraFLOPs per second photonic convolutional accelerator for deep learning optical neural networks
• Microresonator solitons for massively parallel coherent optical communications
• An Integrated-Photonics Optical-Frequency Synthesizer
• Ultrafast optical ranging using microresonator soliton frequency combs
• Photonic chip based optical frequency comb using soliton induced Cherenkov radiation
• Generation of Ultrastable Microwaves via Optical Frequency Division
• Fully integrated ultra-low power Kerr comb generation
• Mode interaction aided excitation of dark solitons in microresonators constructed of normal dispersion waveguides
• Massively parallel coherent laser ranging using soliton microcombs
• Soliton Microcomb Range Measurement
• Integrated turnkey soliton microcombs operated at CMOS frequencies
• Nanophotonic soliton-based microwave synthesizers
• Optical data transmission at 44Tb/s and 10 bits/s/Hz over the C-band with standard fibre and a single micro-comb source
• On-chip dual comb source for spectroscopy
• Photonic microwave signals with zeptosecond level absolute timing noise
• Ultra-efficient frequency comb generation in AlGaAs-on-insulator microresonators
• Thermal and Nonlinear Dissipative-Soliton Dynamics in Kerr Microresonator Frequency Combs
• Single-mode dispersive waves and soliton microcomb dynamics
• Mode-locked ultrashort pulse generation from on-chip normal dispersion microresonators
• Thermo-refractive noise in silicon nitride microresonators
• Brillouin-Kerr soliton frequency combs in an optical microresonator
• Nanometric precision distance metrology via chip-scale soliton microcombs
• Photonic flywheel in a monolithic fiber resonator
• Detuning-dependent Properties and Dispersion-induced Instabilities of Temporal Dissipative Kerr Solitons in Optical Microresonators
• Quantum diffusion of microcavity solitons
• Harnessing Dispersion in Soliton Microcombs to Mitigate Thermal Noise