Abstract
A high-Q-factor tunable silica-based microring resonator (MRR) is demonstrated. To meet the critical-coupling condition, a Mach–Zehnder interferometer (MZI) as the tunable coupler was integrated with a racetrack resonator. Then, 40 mW electronic power was applied on the microheater on the arm of MZI, and a maximal notch depth of about 13.84 dB and a loaded Q factor of 4.47 × 106 were obtained. The proposed MRR shows great potential in practical application for optical communications and integrated optics.
Highlights
Owing to the compact footprint and functional versatility, optical microresonators have attracted much attention in many fields, including optical filters [1], sensors [2,3], and nonlinear optics [4]
To achieve high Q factor and notch depth, microring resonator (MRR) are designed to work under the critical-coupling condition
Image of core waveguide cross-section. Both coupling condition and resonant wavelength were tunable by applied electric Because of themeter polarization sensitivity of the microring resonator, on polarization-main power using source instruments
Summary
Owing to the compact footprint and functional versatility, optical microresonators have attracted much attention in many fields, including optical filters [1], sensors [2,3], and nonlinear optics [4]. Among them, benefitting from low loss, miniaturization, scalability, and high fiber-coupling efficiency, silica-based PLCs devices show great potential in optics integration and commercial field [17,18,19]. Till silica-based high Q factor microring resonators (MRRs), a great candidate for optical interconnection and wavelength division multiplexing systems, have been less demonstrated [16]. To achieve high Q factor and notch depth, MRRs are designed to work under the critical-coupling condition. Replacing fixed directional couplers with tunable couplers is an efficient method to meet the critical-coupling condition [12,15,24,25]. A high-Q-factor silica-based MRR was designed and is experimentally demonstrated. To obtain high-notch-depth MRRs, an MZI structure is used to replace the conventional directional coupler.
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