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We investigate the use of an ultra-shallow partial etch to form silicon microring resonators with high Q in a 250nm thick SOI device layer, to enable narrowband filters for RF photonic signal processing in conventional silicon photonics platforms. We demonstrate compact ring resonators formed by waveguides with as shallow as 25nm deep etches in a 250nm device layer and show significant improvement...
Resonant quantum photonic sources with dissimilar decay rates are proposed and theoretically demonstrated to improve the efficiencies of entangled photon and squeezed light sources while also enabling engineering of frequency correlations in photon pair sources.
We propose and theoretically investigate a configuration of an optical parametric oscillator which asymmetrically distributes the frequency noise of a pump laser through a nonlinear process in an optical cavity to two nondegenerate output modes.
We present a scalable photonics process utilizing i-line lithography to achieve 2.46dB/cm propagation losses and multiple high-performance devices. Fiber support structures are lithographically aligned to gratings, enabling durable packaging of multiple fibers on a chip.
Apodized bi-level fiber-to-chip grating couplers, designed using a complex-wavevector band-structure approach, are demonstrated in a commercially available, monolithic SOI CMOS process achieving 92% (−0.36dB) coupling efficiency.
We present a photonics process utilizing i-line lithography to achieve 2.5 dB/cm losses in low-temperature-deposited SiN. Lithographically-defined fiber packaging structures are aligned to gratings, enabling compact, durable packaging of multiple fibers on a chip and tolerant of temperatures from 1K to 43 3K.
We demonstrate seeded four-wave mixing in a photonic circuit fabricated within an unmodified commercial microelectronics CMOS SOI platform, using a minimally dispersive microcavity design.
We present the design and characterization of highly directional vertical grating couplers achieving −1.2 dB coupling efficiency with 78nm 1- dB bandwidth realized in a commercially available 45nm microelectronics SOI process.
We demonstrate a dual-cavity resonant structure that employs frequency splitting at one of three resonances to structurally compensate dispersion. We show seeded four-wave mixing across the largest free spectral range to our knowledge of 26nm.
We propose and demonstrate the first asymmetric unidirectional grating couplers fabricated in a 45nm unmodified CMOS process. Measured coupling efficiency from fiber-to-chip is ∼ 40 %. Simulations show >70% efficiency is achievable with same design.
We propose coupled-cavity resonators for four-wave mixing (FWM) that support strong nonlinear interaction between distributed pump, signal and idler modes, yet allow independent coupling of these modes to separate ports. We demonstrate seeded FWM and discuss applications of such orthogonal coupling.
We propose a novel laser cavity based on imaginary-frequency resonance splitting in coupled resonators. Using different free-spectral ranges (FSRs), a Vernier-like effect where only one longitudinal mode lases allows for ultra-wide tuning of single-frequency lasers.
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