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Temporal stability of the parametric spectro-temporal analyzer (PASTA) system is thoroughly explored and significantly enhanced, with the spectral accuracy improved from 1.6 nm to 0.04 nm, leveraging the active phase-lock loop and temperature feedback control.
We report an all-optical real-time ultra-broadband radio frequency (RF) spectrum analyzer based on parametric spectro-temporal analyzer (PASTA). It not only has the large RF bandwidth (over 800 GHz), but also achieves over 90-MHz frame rate.
A robust photonic DIFF exploiting the slow light effect in a photonic crystal waveguide is proposed and experimentally demonstrated. Input Gaussian pulses with full-width half-maximums ranging from 2.7 ps to 81.4 ps can be accurately differentiated.
A novel concept to generate linear chirped microwave signal is proposed and experimentally verified. The frequency to time mapping method is used while the Mach-Zehnder interferometer based on the photonic crystal waveguide is employed as the key device with its significant advantages of the ultra-compact footprint and simple design.
An all-optical electrical spectrum analyzer is demonstrated based on dual optical frequency combs and microwave photonics, and it improves the resolution to be 250 MHz over 10-GHz bandwidth, with the 1-kHz frame rate. The spectrum is directly obtained in the time domain, using as low as 10-MHz acquisition bandwidth, without any post-processing.
A novel optoelectronic oscillator by using cascade microwave photonic filters is proposed and demonstrated. The obtained RF signal shows a tuning range from 0 to 40 GHz. The side-mode rejection ratio maintains higher than 40 dB during the tuning process. At 10 kHz offset frequency, the measured phase noise of the 21-GHz signal is −98 dBc/Hz.
Integrated microwave photonics has attracted a lot of attentions and makes significant improvement in last 10 years. We have proposed and demonstrated several schemes about microwave photonics including waveform generation, signal processing and energy-efficient micro-heaters. Our schemes are all fabricated on silicon-on-insulator chips and have advantages of compactness and capability to integrate...
A polarization analyzer is presented by polarization-mode-frequency mapping. The two orthogonal circularly polarized components of light are converted to two orbital angular momentum (OAM) modes by a q-plate, and then the OAM modes are mapping to two frequencies by using rotational Doppler Effect. The polarization of light can be retrieved by Fourier transform of the signal collected by a photodetector.
A tunable single passband microwave photonic filter (MPF) with compensation for fiber dispersion induced radio frequency (RF) power fading is realized. When the central frequency of the MPF changes the passband amplitude can be kept invariant. The proposed MPF has a tunable range of 0–30 GHz and the rejection ratio exceeds 30 dB.
We have demonstrated a single passband microwave photonic filter (MPF) based on the stimulated Brillouin scattering (SBS). The obtained single passband MPF shows a main to secondary sidelobe ratio (MSSR) of exceeding 50 dB with a center frequency tunable from 0 to 40 GHz, and a full width at half maximum (FWHM) bandwidth of 16 MHz.
We theoretically investigate the nonlinear loss impacted nonlinear effects in a silicon waveguide, targeting a highest four-wave-mixing efficiency. A simple and accurate formula for optimal length calculation is derived, providing a promising criterion to accurately design the nonlinear waveguide.
We demonstrate for the first time dual-channel all-optical AND logic operations based on intra-modal four-wave mixing (FWM) for on-off keying (OOK) signals in a multimode silicon waveguide. Correct temporal waveform sequences and clear eye-diagrams are presented to confirm the AND logic operations in this proof-of-concept work.
We first experimentally demonstrated ultra-compact four-channel drop filters based on one-dimensional photonic crystal nanocavities. The drop wavelengths were controlled at 7.9±0.3nm spacing by changing the cavity length of the nanobeam cavities on several nanometers. The device size was as small as 7 μm × 34 μm, and the extinction ratio was as high as 25dB.
We propose and experimentally demonstrate a real-time broadband radio frequency (RF) spectrum analyzer. It achieves 800-GHz bandwidth, as well as 94-MHz frame rate, without sacrificing the resolution (1.25 GHz). It is capable of observing the multi-frequency at a single frame.
We propose and experimentally demonstrate all-optical canonical logic units and wavelength conversion at 40 Gb/s by using four-wave mixing in a single highly nonlinear fiber. These results are achieved in seven parallel channels simultaneously.
We propose and experimentally demonstrate an on-chip low power consumption optical diode based on the optomechanical effect. The forward-backward nonreciprocal transmission ratio (NTR) is 10.9 dB under 3.5 mW input power, the resonance red-shift is up to 0.70 nm.
We propose and experimentally demonstrate a temporal cloak with the new capability not only to conceal pseudorandom inverted return-to-zero optical data (cloaking mode), but also to create “illusion” optical data for observer at telecommunication data rate (romanticizing mode).
We demonstrated a three modes multiplexed silicon photonic integrated circuit suitable for chip-scale large capacity optical interconnection. The 30 Gb/s link including modulation, multiplexing/demultiplexing, transmission and detection is experimentally demonstrated with reasonable power penalty.
A magnetic-field sensing scheme based on a silica microcapillary resonator filled with magnetic fluid is proposed and experimentally demonstrated. The results show that a sensitivity of 4.6 pm/mT is achieved.
We experimentally demonstrate a six-port passive circuit supporting all-optical ordered-route transmission using thermo-optic effect. The 15-dB bandwidth (BW) is larger than 0.05 nm and the maximum blocking extinction ratio (BER) is 39 dB.
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