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Multiheterodyne frequency comb spectroscopy without mode-locked lasers is reported in the near-infrared C and L telecommunication bands. The system without active stabilization combines high signal-to-noise ratio, rapid tuning and moderate multiplex spectral span.
We experimentally demonstrate an all-optical flip-flop memory based on the bistability of tunable V-cavity laser with short storing and erasing response time of about 150ps and 159ps, respectively.
We demonstrate single atomic cladding layer of graphene enhance the photocurrent profile of the monolithic silicon p-i-n junction, by spatially- and spectrally- resolved photocurrent measurement.
We report a mid-infrared femtosecond OPO based on CdSiP2 tunable across 6786–7069 nm, generating record power of 110-mW at 7μm, with passive power and wavelength stability below 3% rms (1-hour) and 0.1% rms (15-min), respectively.
We demonstrate an on-chip thermal-tuned optical pulse shaper based on the four-path finite impose response (FIR). Four typical waveform are demonstrated by tuning the phase and amplitude of each path.
We present a high-performance InGaN/GaN heterojunction phototransistor with the responsivity (Rλ)> 8 (A/W) low norse-equrvalent-power (NEP) < 1.1×10−17 (W-Hz−0.5) and high detectivity(D∗)> 1.2×1014 (cm-Hz0.5-W−1).
We experimentally demonstrate the ability to couple any polarization state from a fiber to the TE-mode of a single waveguide in an integrated silicon photonics circuit. We achieved this by combining a 2D-grating coupler and two tunable Mach-Zehnder Interferometers (MZI) into a polarization adapter. We obtain less than ±0.6 dB standard deviation across all input polarization states at a wavelength...
For the first time, an integrated photonic phase-sensitive amplifier is reported. Approximately 6.3 dB extinction of on-chip phase-sensitive gain based on a signal-degenerate dual pump four-wave mixing architecture has been achieved.
We demonstrate InP nanopillar bipolar junction phototransistors monolithically integrated on a Silicon substrate. With a responsivity of 4 A/W and bandwidth of 7.5 GHz, these receivers indicate a route towards efficient on-chip optical interconnects.
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.
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