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An analytical characterization of the accuracy of disparity-based autofocus requires an effective error model of disparity estimation. In this paper, we investigate the approximation of photon shot noise of images by a Gaussian model for disparity error analysis that takes defocus blur and image noise into account. We show that, counterintuitively, defocus blur alone does not affect the disparity...
Today's electronic photonic integration approaches involve various trade-offs between integration complexity, cost and performance, with no single approach being able to satisfy both the high-performance and low cost/complexity requirements. Luxtera's process [1] represents monolithic integration, which has low parasitics and customized photonics but slow transistors. Oracle's [2] and ST Micro [3]...
We demonstrate combined wavelength- and mode-multiplexed transmission over a 125-km multimode single span composed of 10- and 15-mode fibers with a spectral efficiency of 29 b/s/Hz. A transmission capacity of 115.2 Tb/s is achieved over a distance of 87 km.
We demonstrate bidirectional pumped Raman amplification and 1050 km combined WD-M/SDM transmission in a 3-spatial-mode few-mode fiber with a 70-km zero-net-gain fiber span.
We demonstrate mode-multiplexed transmission over all-fiber optically amplified spans of 215 km and 179 km for 3 and 6 spatial modes, respectively. The spans were amplified using two cladding-pumped few-mode fiber amplifiers.
We fabricate ten- and fifteen-mode photonic lanterns by using microstructured preforms that enables a repeatable fabrication process and scalability to large number of modes. Mode selective capability is demonstrated by independently exciting individual LP mode.
We demonstrate the efficient coupling of a diamond micro-waveguide containing a single nitrogen-vacancy center to a single mode optical fiber. Strong photon anti-bunching is observed with a raw single-photon count rate exceeding 712,000 Hz.
Biomedical imaging has become one of the most relied-upon tools in health-care for diagnosis and treatment of human diseases. The evolution of medical imaging from plain radiography (radioisotope imaging), to x-ray imaging, to computer-assisted tomography (CAT scans), to ultrasound imaging, and to magnetic resonance imaging (MRI) has led to revolutionary improvements in the quality of healthcare available...
A silicon-photonic link is monolithically-integrated in a bulk CMOS process for the first time. Deep-trench isolation enables polySi waveguide integration. PolySi resonant detectors remove the need for Ge integration. Split-diode design enables half-rate receivers, mitigating transistor speed limitations. An on-chip feedback loop locks the resonant defect detector to the laser wavelength, combating...
An optical transmitter and receiver with monolithically-integrated photonic devices and circuits are demonstrated together for the first time in a commercial 45nm SOI process, without any process changes. The transmitter features an interleaved-junction carrier-depletion ring modulator and operates at 3.5Gb/s with an 8dB extinction ratio and combined circuit and device energy cost of 70fJ/bit. The...
GaN-based LEDs with a p-InGaN layer was proposed and fabricated. By inserting the 50-nm-thick layer, it was found that we could reduce the 20 mA forward voltage from 3.34 to 2.99 V. It was found the inserted p-InGaN layer could also reduce the efficiency droop from 36.7% to 23.8%.
We introduce a new integrated-optics spectroscopy scheme based on multimode interference, achieving ultra-high resolving powers (Q > 105) with linewidths down to 10 pm at 1500 nm, and a broad spectroscopy range from 500 nm to 1600 nm within a monolithic, millimeter-scale device.
We present a mass fabrication method of diamond nanoscale slabs by alternating plasma etching and mask deposition. These slabs support NV− spins with long coherence times and are suitable for a range of nanophotonic devices.
Unidirectional waveguides play a very important role in integrated optical circuit, especially nanophotonics. The dispersive relations of a gyrotropic material are studied in detail. We take advantage of the surface modes, which break the time reversal symmetry, to design one-way waveguides.
We demonstrate two high-performance photonic-transmitters based on uni-traveling-carrier-photodiode (UTC-PD) and separated-transport-recombination-photodiode (STR-PD). Thanks to recombination center, STR-PD exhibits comparable maximum-peak-power and electrical pulse-width with much smaller photocurrents and less serious device-heating to those of UTC-PD.
This invited paper reviews our recent progress in silicon microresonator-based passive devices for potential on-chip optical interconnect applications. Specifically, we report our proposals and initial demonstrations of (i) many-element cascaded microdisk resonators as optical delay lines, and (ii) cascaded microring switch matrix. We also report our study on surface-state absorption-induced thermo-optical...
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