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We demonstrate the design and performance of series-coupled racetrack resonators in silicon-on-insulator. The device was modeled and optimized by tuning various parameters such as power coupling factors and resonator dimensions. The Vernier effect is experimentally verified with an extended free spectral range of 36.2 nm and an interstitial resonance suppression of more than 11 dB. To the best of...
We demonstrate the design and performance of a silicon-on-insulator ring-resonator reflector with a low-loss, low-crosstalk waveguide crossing. The device is simulated using the transfer-matrix method and a 2D finite-difference mode solver. It functions as a reflective-type notch filter and can be used for optical communications or thermal, biochemical, or other sensors. An extinction ratio of over...
A traveling-wave resonator structure with interferometric-coupling scheme is shown to have the capability of supporting both over-coupled and critically-coupled modes, simultaneously. This device is demonstrated in SOI with an integrated microheater to tune its coupling. The application of this device for nonlinear optics is discussed.
Ultra-high-quality (Q>4times106) microdisk resonators are demonstrated in a Si3N4 platform at 655 nm with straight and curved in-plane coupling waveguides. Selective coupling to specific radial orders and polarizations is demonstrated by phase-matching. TM modes show higher sensitivity to environmental modifications for sensing.
An optical switch based on the Mach-Zehnder interferometer (MZI) with a micro-ring resonator as the two-beam interferometer is proposed. By configuring appropriate coupling ratios, the improved MZI can always obtain a low crosstalk, even with seriously unbalanced interferencing beams.
A spectral response of coupled silica disc microresonators is investigated and light intensity distribution among the coupled discs is measured. The latter depends on the resonance frequencies of each of the resonators and excitation condition.
Filters operated close to the critical coupling were reported to be capable of an increase and decrease of the group velocity. The published examples are ring resonators (feedback-based filter) and Mach-Zehnder filters (no feedback filters). Here we show that these linear filters have, within certain bandwidth, identical filtering characteristics, although they are based on completely different filtering...
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