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We demonstrate a novel fiber-based spectral-domain interferometry (SDI) technique for terahertz electric field measurement. Signal-to-noise ratio is enhanced by more than four folds while the scanning window is extended to >30 picoseconds compared to conventional SDI techniques.
We describe an experimental demonstration of fiber-based optical phase-sensitive amplification for improved detection of correlated single-photon pairs. A measured coincidence gain of 4.5dB provides 3dB improvement in the detection system signal-to-noise ratio.
A wavelength controlled and frequency chirp reduced colorless laser diode is directly modulated by 256-QAM-OFDM data to achieve a high spectral efficiency of 8 bit/sec/Hz at 40 Gbit/s with an optimized BER of 3.7×10−3.
The nonlinear propagation in few-mode fibers (FMFs) is modeled using a Gaussian approach, where a closed-form formula for the nonlinear interference is derived. The impacts of different nonlinearity penalties are investigated using this model.
We present the first phase-diversity coherent receiver for an arbitrary hybrid. Colorless reception of 10×132-Gb/s PDM-QPSK is experimentally demonstrated with reduced components and with less than 0.5 dB in OSNR penalty compared to traditional coherent receivers.
We present performance analysis of chirped laser dispersion spectroscopy (CLaDS) under shot noise limited conditions. A comparison to direct laser absorption spectroscopy (DLAS) is also provided.
An integrated photonic reservoir computing based on hierarchical time-multiplexing structure is proposed by numerical simulations. Error rates of 2.2∼6.5% for chaotic time series prediction are achieved with sample rate of 1.3∼0.4Gbps and bandwidth of 40∼10GHz.
Electron-injection detectors are used in an OCT system for the first time. Compared to a commercial p-i-n detector, electron-injection detectors show ∼20 dB higher SNR. This could lead to OCT systems without the need for balanced-detection.
In this work, we demonstrate saturated photon detection efficiency with narrow NbN nanowires and SNAPs to boost the signal-to-noise ratio, and we demonstrate a stabilizing choke inductance that is part of the optically-active area.
A multiple-layer-overlay (MLO) modulation format is employed for a 14-km optical fiber link and an enhanced spectral efficiency of 2.36 bits/s/Hz is achieved by multiplexing 3-layer signals with each layer carrying a 2-Gbit/s QPSK signal.
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.
A detection scheme for discriminating coherent states in quantum key distribution systems employing PSK is proposed. It is simple and uses only standard components. Its applicability at extremely low power levels of as low as 0.045 photons per symbol is experimentally verified.
We proposed and demonstrated a cost-effective in-band optical signal to noise ratio (OSNR) monitoring technique based on coherent hybrid in 20Gb/s CO-OFDM system. Less than 0.5dB monitoring error is achieved with 400MHz balanced photodetector (PD).
We describe a classical-state system capable of mimicking the essential features of Barreto Lemos et a/.'s quantum imaging with undetected photons [Nature, 512, 409–412 (2014)]. but with a much higher signal-to-noise ratio.
We propose a new high-dimensional modulation (HDM) format, based on the Nordstrom-Robinson code, which is the best-known nonlinear block code in 16 dimensions. With EXIT chart, we optimize LDPC codes for various HDM formats, and show their benefits.
We propose an all-optical phase-preserving scheme for multilevel amplitude regeneration based on coherent polarization mixing for optical star-8QAM/star-16QAM signals with a power ratio of 1:5. A regeneration factor of 4.9 for star 8-QAM is achieved.
We present the first carrier-envelope-offset (CEO) frequency detection based on multi-octave-spanning supercontinuum generation in a CMOS-compatible Si3N4 waveguide. Strong CEO-beat-signals (>30 dB) of a gigahertz-Yb:CALGO-laser were obtained with only 36 pJ of coupled pulse energy.
The temporal profile of frequency combs based on quantum cascade lasers has been unclear for some time. We show how the SWIFTS technique directly measures such properties, obtaining combs' intensities and frequencies versus time.
We demonstrate frequency conversion of single-photon-level signals with an efficiency of 25% and signal-to-noise level >20:1, via four-wave-mixing Bragg scattering in a Si3N4 microring using low power (<20 mW per pump), continuous wave pump lasers.
Counter-phase modulation of WDM 24×100 Gb/s DP-QPSK channels in a polarization-insensitive fiber-loop is demonstrated for low noise degenerate four-wave mixing with a CW pump. The OSNR is boosted by ≈9 dB enabling an average ≈4 dB Q2-factor improvement.
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