Packaged photonic chip-based soliton microcomb using an ultralow-noise laser

Abstract

Photonic chip-based soliton microcombs have shown rapid progress and have already been used in many system-level applications, including coherent communications, astrophysical spectrometer calibration and ultrafast ranging. While there has been substantial progress in realizing soliton microcombs that rely on compact laser diodes, culminating in devices that only utilize a semiconductor amplifier or a self-injection-locked laser as a pump source, accessing and generating single soliton states with electronically detectable line rates from a compact laser module has remained challenging. Here we demonstrate a current-initiated, $\mathrm{S}{\mathrm{i}}_3{\mathrm{N}}_4$ chip-based, 99-GHz soliton microcomb driven directly by an ultra-compact, low-noise laser. This approach does not require any fast laser tuning mechanism, and single soliton states can be accessed by changing the current of the laser diode. A simple, yet reliable, packaging technique has been developed to demonstrate the viability of such a microcomb system in field-deployable applications.

arXiv comment5 Pages, 3 figures

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• Recent Advances in Laser Self-Injection Locking to High-$Q$ Microresonators
• Ultrafast optical circuit switching for data centers using integrated soliton microcombs
• Optimization of laser stabilization via self-injection locking to WGM microresonator
• Piezoelectric actuation for integrated photonics
• Hybrid integrated mode-locked laser diodes with a silicon nitride extended cavity
• Analysis of Kerr comb generation in silicon microresonators under the influence of two-photon absorption and free-carrier absorption
• Generation of a microresonator soliton comb via current modulation of a DFB laser
• Direct fiber-coupled soliton microcomb system with enhanced stability and reproducibility via high numerical-aperture polarization-maintaining single-mode fibers and temperature control
• Refined method to extract frequency-noise components of lasers by delayed self-heterodyne