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We propose the use of titanium dioxide as cladding material to reduce the temperature sensitivity of silicon-based microresonators. The advantages of using titanium dioxide over the conventional alternatives are discussed, and experimental results are presented.
We propose and demonstrate a scheme that suppresses degradation induced by in-band crosstalk and amplified spontaneous emission (ASE) noise in differential phase shift keying signal, using feedforward control. Though in-band crosstalk in wavelength division multiplexing networks or ASE from optical amplifiers degrades system performance, we can suppress the degradation using the feedforward control.
We report on an experimental implementation of an interface between quantum dots (QD) and parametric downconversion (PDC). We present a PDC source compatible with QD emission and our efforts to demonstrate such compatibility.
We demonstrate an error-free add-drop filter for a 10 Gbps signal, tunable over 16 nm. The structure consists of a series of ring resonators embedded between micro-heaters designed to ensure homogeneous temperature distribtion.
We demonstrate optical carrier regeneration for wavelength reuse in a multicarrier distributed OADM network. It is possible to achieve a high-quality regenerated signal even though the employed data signal for wavelength reuse is drastically degraded.
This paper reports on the co-fabrication of photonic whispering gallery mode disk resonators and RF MEMS radial contour mode resonators on the same SOI substrate. By mechanically coupling the MEMS and photonic resonators, we have demonstrated a silicon RF MEMS based optical modulator which can modulate light with wavelength 1560 nm at 288 MHz.
A quantum key distribution scheme using macroscopic coherent light with phases of ±δand optically pre-amplified direct differential detection is described. The scheme is favorable for practical implementation and wavelength multiplex with conventional optical signals.
We propose and demonstrate a scalable high-sensitivity approach for achieving multi-rate DPSK using a single transmitter and fixed-interferometer-receiver design. Near-theoretical real-time performance is demonstrated over static and fading channels at rates from 2.4Mbps to 2.5Gbps.
We report cavity-enhanced photocurrent generation in the 1.55-µm wavelength range in a p-i-n diode integrated silicon microring resonator matrix. We demonstrate photocurrent of ∼10 nA at microring resonance wavelengths and cavity enhancement exceeding 11-fold.
A novel optical coherence domain reflectometry (OCDR) by use of an optical frequency comb source is proposed and demonstrated with high spatial resolution (<10 cm), large dynamic range (>45 dB), and short measurement time (≤10 s).
We have successfully realized an optical frequency tunable Cs atomic clock with a mode-hop-free fiber laser. The optical frequency of the 9.1926 GHz clock was continuously tuned over 1 GHz without changing the clock frequency.
We present a class of devices called Asymmetric Bowtie nano-Colorsorters. These devices have specifically engineered symmetries enabling them to capture, confine, spectrally filter and steer optical fields while maintaining nanoscale field distributions.
Continuously tunable mid-infrared OPO with output energy of several mJ around 3 µm range could be realized by angular tuning of large-aperture PPMgLN device with tilted QPM structures.
We generate optical beams with rotating intensity blades, namely “optical propellers”, by employing Moiré technique. Such rotating beams are controlled by SLM without mechanical movement or phase-sensitive interference. Self-trapping of propelling beams is also demonstrated.
In this new architecture of extended cavity diode laser, broadband tunability is provided by an acousto-optical tunable filter with a longitudinal interaction. The laser offers single mode operation, >100 nm accordability, and two-wavelength operation capability.
We report progress in implementing a quantum memory scheme in Pr3+:Y2SiO5, including experimental and theoretical results using spectral hole-burning to generate narrow absorbing features and implement narrow spectral filtering.
Ultra-broadband amplitude modulation for spectral-shifted pulse pair generation is realized by a liquid-crystal spatial light modulator. The results indicate that it's a promising way for single attosecond pulse characterization by the conventional SPIDER method.
We report CEO frequency measurements of a 10 GHz harmonically modelocked, etalon stabilized comb source using a multi-heterodyne beating technique. Also, preliminary results from an attempt at f-2f self referencing measurement are presented.
We demonstrate an ultrastable high-power laser system providing transform-limited 20-to-100 fs pulses at a tunable central wavelength. Subsequent frequency-conversion provides wavelength-tunable second and third harmonic radiation with up to 3.7 mJ.
We use a pulse-compression chirp-transform algorithm to generate broadband photonic arbitrary waveforms. A phase-locked loop frequency agile laser provides the needed broadband frequency scans. The experiment operates at the telecom wavelength of 1.5μm.
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