Broadband dispersion engineered microresonator on-a-chip

Abstract

Control of dispersion in fibre optical waveguides is of critical importance to optical fibre communications systems and more recently for continuum generation from the ultraviolet to the mid-infrared. The wavelength at which the group velocity dispersion crosses zero can be set by varying fibre core diameter or index step. Moreover, sophisticated methods to manipulate higher-order dispersion so as shape and even flatten dispersion over wide bandwidths are possible using multi-cladding fibre. Here we introduce design and fabrication techniques that allow analogous dispersion control in chip-integrated optical microresonators, and thereby demonstrate higher-order, wide-bandwidth dispersion control over an octave of spectrum. Importantly, the fabrication method we employ for dispersion control simultaneously permits optical Q factors above 100 million, which is critical for efficient operation of nonlinear optical oscillators. Dispersion control in high Q systems has taken on greater importance in recent years with increased interest in chip-integrable optical frequency combs.

References in corpus (9)

• Photonic chip based optical frequency comb using soliton induced Cherenkov radiation
• Mode interaction aided excitation of dark solitons in microresonators constructed of normal dispersion waveguides
• Ultrafast modelocked nonlinear micro-cavity laser
• Ultra-pure RF tone from a micro-ring resonator based optical frequency comb source
• Low-Pump-Power, Low-Phase-Noise, and Microwave to Millimeter-wave Repetition Rate Operation in Microcombs
• Phase Steps and Hot Resonator Detuning in Microresonator Frequency Combs
• Counting the Cycles of Light using a Self-Referenced Optical Microresonator
• Dispersion engineering of high-Q silicon microresonators via thermal oxidation
• Self-referencing a continuous-wave laser with electro-optic modulation

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