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By carefully designing diagonal transitions in the active region, we present a broadband mid-infrared quantum cascade detector with photocurrent ranging from 3.9 to 9.6 μm, more than 2 times broader than stacked designs.
We present a large-girth-non-binary QC-LDPC code suitable for beyond 100 Gb/s optical transmission and describe its implementation in FPGA. Great performance with Q-limit of 5.0 dB at BER of 10−10 has been found, which corresponds to NCG of 11.95 dB at 10−15.
High-speed optical data signal generation of >6.8 Gb/s with an error-free operation was successfully demonstrated using newly developed monolithically integrated quantum dot optical modulator and semiconductor optical amplifier operated in an ultra-broad optical frequency bandwidth.
The UV-excited photoluminescence was measured for single CdSe nanocrystals and an average carrier multiplication efficiency of ∼13.1% was obtained when the excitation photon energy was set at ∼2.46 times of the nanocrystal energy gap.
The wave-particle duality of light has led to two different encodings for optical quantum information processing. We report here the remote generation of entanglement between particle-like discrete-variable qubits and wave-like continuous-variable qubits.
This paper demonstrates Intra-PON optical Flow transmission via a QPAR node. Simulations show 2 to 20x traffic waiting time reduction comparing to no or fixed Intra-PON designs. Experiments show error-free Intra- and Inter-traffic with/without QPAR reconfiguration.
We report a PAM-ECDMA PON system with 2.5-fold performance improvement over the prior NRZ-ECDMA system. Error-free transmission of two channels in an 8-user 25.6 Gb/s aggregate-data-rate PON is achieved in a proof-of-principle demonstration.
We describe a new optical coagulation sensing approach termed Optical Thromboelastography (OTEG) that measures a patient's coagulation status using a drop of blood. In OTEG, laser speckle intensity fluctuations are analyzed during clotting to measure the viscoelastic properties of blood during coagulation and recover information about multiple coagulation metrics within minutes. This technology addresses...
Specially formulated Gradient-Index polymeric optical materials offer capabilities not possible in present GRIN optics. A novel technology that enables large scale processing of nanolayered polymer films into real, performance-enhancing lenses for military Night-Vision-Goggle eyepieces is discussed.
A new network scheme employing stable seed lightwave distribution is investigated for reducing QAM demodulation complexity. We perform 150 km seed distribution before 100 km WDM-PDM-64QAM transmission and achieve simple demodulation without phase estimation.
We present a novel method to control the phase and amplitude of a femtosecond laser beam using a linearized version of the transport-of-intensity equation. Simulations show a peak power improvement better than 30%.
We demonstrate three-photon fluorescence adaptive-optics system based on 1660-nm femtosecond pulses and MEMS spatial light modulator. We use the higher nonlinearity of the signal resulting in ×700 improvement in fluorescence beads signal after aberrations correction.
We present a modified version of adaptive digital backpropagation based on EVM metric, and numerically access its performance in a flexigrid WDM scenario.
Glass solar reflectors, similar to those widely used to concentrate sunlight in solar thermal plants, form the basis for REhnu's HCPV generators. Multijunction cells are housed in small, upgradeable units at each mirror focus.
A quantitative polarization sensitive optical coherence tomography (PS-OCT), so called Jones matrix (JM-) OCT is presented. This system measures the Jones matrix tomography of biological and medical samples. Jones matrix based signal processing and numerical estimator algorithm are then applied to obtain truly quantitative value of tissue birefringence. The clinical utility of JM-OCT is examined by...
We review results of 10 joint research projects on ultrashort pulse technology. Topics include novel laser sources, reliable components and specialized applications from eye surgery to processing of semiconductors, carbon fiber reinforced plastics and metals.
By utilizing an analytical effective medium and an exact numerical approaches we design a magnetoplasmonic hyperbolic metamaterial with broadband nonreciprocal response. It is shown that such metamaterial, with reduced spatial symmetry and the time-reversal symmetry broken by magnetization, exhibits multiple nonreciprocal hyperbolic regimes. Magnetization induced one-way topological phase transitions...
Combining a rate-¼ forward error-correcting code, a coherent receiver, and an optical phase-locked loop yields near error-free performance with 2-dB photon-per-bit sensitivity, which is <3-dB from the Shannon limit for a rate-¼, pre-amplified, coherent receiver.
Optimum design of high-energy parametric down-conversion schemes mandate investigation of nanosecond laser-induced damage threshold in KTiOPO4 and Rb:KTiOPO4 at 1.064 μm and 2 μm. A surface damage threshold of 10 J/cm2 at 2 μm was determined for both materials.
Optical phase lock loop circuit for non-degenerate parametric phase sensitive amplifiers with wide signal-idler light frequency spacing is proposed. The proof-of-principle experiment is successfully demonstrated for 40-GHz spaced signal-idler lights using 5-GHz beat signals.
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