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One-dimensional grating couplers and waveguides are fabricated in 500 nm X-cut Lithium Niobate thin film making use of the Lithium Niobate on Insulator (LNOI) platform. Single coupler exhibit −12 dB peak insertion loss.
We report on the design, fabrication, and characterization of photonic crystal phase modulators on epitaxial barium titanate thin films. Modeling indicates that >50 GHz bandwidth and 0.25 V·cm voltage-length product are achievable in sub-millimeter long devices.
The first 1064-nm-pumped OP-GaP OPO was successfully demonstrated. A Q-switched Nd:YVO4 laser (∼1W, 3.3ns, 10kHz) pumped OP-GaP (16.5-mm-long, 20.8-micron grating period) yielded temperature-tunable signal and idler output wavelengths of 1385–1361 nm and 4591–4876 nm respectively.
We report on ZnGeP2-based parametric sources pumped by holmium lasers which are resonantly pumped by thulium fiber lasers. Using this scheme, we have built one source with up to 22 W average power and another with more than 0.2 J pulse energy in the mid-infrared region.
We demonstrate a room-temperature continuous-wave electrically injected unidirectional-emission AlGalnAs/InP multiple-quantum-well microspiral disk laser with a 44mA threshold current. Above 130 mA, the laser shows a unidirectional emission from the waveguide butt-coupled to the microspiral notch.
We propose a modified log-likelihood ratio (LLR) calculation for an LDPC decoder to be robust against residual phase noise at the demodulator. The proposed scheme is based on a linear/bilinear transform offers 1 ∼ 2dB gain in the presence of large phase noise.
We propose a new implementation of a QPSK modulator using a simple single ring resonator. That requires only < π/10 phase shift. Signal generated have a better dispersion tolerance than from a single phase modulator.
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.
We report a transmission of 400 Gbit/s signal over a four channels, 1-meter mode-division-multiplexed free space optical communication link using multiple orbital-angular-momentum beams with non-zero radial indices, achieving a power penalty less than 6 dB.
We demonstrate an amplified fiber ring cavity at telecommunication window addressed by optical pattern at 1.0 μm. A storage time longer than 38 μs and an ultra-wideband wavelength conversion of ∼500 nm have been obtained.
We present the first realization of a single-mode surface-emitting quantum cascade laser array. The ten lasers operate over a bandwidth of 175 cm−1 between wavelengths of 8 and 10 μm and show similar pumping characteristics. The device is compatible with milliwatt continuous wave operation, which makes it suitable for spectroscopic applications.
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.
Dual-comb spectroscopy without mode-locked lasers is demonstrated in the telecommunication region. As a proof-of-principle, we measure Doppler-limited rovibrational spectra of the 2ν3 band of H13C14N spanning more than 4 THz with resolved comb lines.
We demonstrate a hybrid silicon micro-ring laser design with novel thermal shunts. With this technique the hybrid silicon ring lasers with a 50 μm diameter operate continuous wave up to 105 °C.
We demonstrate InAs/GaAs quantum dot lasers on silicon-on-insulator substrates by metal-stripe wafer bonding technology. Our III-V-on-Si bonded laser exhibits room-temperature lasing at 1.3 μm with current injection through the bonding metal stripe.
Quantum-confined Stark effect of Ge(Sn)/SiGe(Sn) quantum wells (QWs) is analyzed by many-body theory. Calculated absorption spectra of Ge/SiGe-QWs are in good agreement with the experiment. Also, the effect of Sn-incorporation is investigated for mid-infrared applications.
We analyze defect-induced mode coupling in a hollow-core photonic bandgap fiber using time-of-flight, and show its utility in complementing optical time-domain reflectometry.
We report on recent results toward development of tunable and miniaturized UV-DUV radiation using microwave-driven plasma-core photonic crystal fiber. Gas-mixture optimized UV-DUV emission and highly efficient microwave ring resonators couplers are demonstrated.
A hollow core four layered Bragg fiber has been fabricated using silicon and silica as alternating layers via high-pressure chemical vapor deposition, which can be used for the guidance of near infrared light.
We present the highest average power from a diode-pumped Ti:Sapphire laser. Using self-starting SESAM-modelocking we obtain 200 mW in 68-fs pulses at 378 MHz. The laser is pumped by two air-cooled 520 nm AlInGaN laser diodes.
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