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We investigate the phase-noise properties of a tunable single-pass optoelectronic frequency comb generator. Residual phase noise at 1 Hz offset from a 10 GHz carrier is as low as −100 dBc/Hz.
We present a novel software-defined radio transceiver, which takes advantages of RF photonic techniques to realize the state-of-the-art performance in the aspect of the frequency range to cover from C band to Ka band.
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.
The adaptive sampling clock was extracted by dual THz-comb-referenced spectrum analyzers and used for THz dual comb spectroscopy (THz-DCS) with unstabilized dual lasers. The demonstrated results implied better spectroscopic performance than THz-DCS with stabilized lasers.
We demonstrate a spectrally efficient parametric comb source for WDM applications using a Si3N4 dual-coupled microring resonator. This geometry allows for operating wavelength flexibility and avoidance of mode crossings for stable comb generation.
We present a microwave photonic multiband bandpass filter with four selectable operating states, which can either work as an all-block, single-pass or multi-pass bandpass filter with up to 46 dB sidelobe suppression.
We report the first fully fiber-interfaced heterodyne system for time-resolved spectral characterization of THz quantum cascade lasers. By exploiting the bias probe rise time we study the current dependent mode tuning with 50ns temporal resolution.
We demonstrate 119.2-GSample/s compressive microwave frequency detection using spectrally-encoded ultrafast laser pulses. We sense sparse tones over > 35-GHz instantaneous bandwidth with 2-MHz accuracy using < 300 consecutive compressive measurements acquired at a 400-MHz rate.
We experimentally realize phase shift keying of ultrabroadband radio-frequency arbitrary waveforms. BPSK, QPSK and 16-PSK modulation are demonstrated for 50-GHz-bandwidth spread spectrum RF waveforms.
Subharmonics radio-frequency division and generation are experimentally demonstrated in nano-optomechanical cavity. The dual-coupled intracavity nonlinear optomechanical and Drude plasma oscillators demonstrate new dynamics regimes, with free-running high amplitude low-phase-noise clocking.
Uni-traveling-carrier photodiodes with novel dual-drifting-layer structure is proposed to realize wide bandwidth and high saturation power performance. High-speed operation at high bias voltage is demonstrated by optimizing the electric field profile within the dual-drifting-layer structure.
Arbitrary RF waveforms are distributed over long fiber with stable group delay, using chromatic dispersion. Input and control waveforms modulate separate tunable lasers. Tracking of the control wave phase is used to adjust both wavelengths.
We experimentally demonstrate the elimination of cross-modulation distortion (XMD) in multicarrier, intensity-modulation direct-detection (IMDD) analog photonic links by cascaded Mach-Zehnder modulators (MZMs). XMD, from both the MZMs and electrical amplifiers, is suppressed by 33 dB.
We introduce and demonstrate an imaging modality that performs differential interference imaging via frequency-to-space mapping and radio-frequency (RF) heterodyne detection.
We propose and experimentally demonstrate photonic time stretch of radio-frequency signals by using a time-gated (pulsed) incoherent light source, with time-stretch factors of 0.83 and 8.66, and a time-bandwidth product of > 340.
The noise properties of two multi-heterodyne spectrometers based on multi-mode semiconductor lasers (QCLs and ICLs) are investigated to determine their detection performance limitations. Both laser technologies provide well-defined multi-heterodyne beat-note structures suitable for spectroscopic measurements.
By the bias-voltage-dependent responsivity, a direct-detection photo detector is proposed to eliminate the third-order intermodulation for the intensity-modulation analog photonic link. Spurious-free dynamic range of 123.4 dB within 1-Hz bandwidth is achieved with 18.1-dB improvement.
We experimentally demonstrate an instantaneous frequency measurement system based on a 65 μm-long integrated Bragg grating filter. An amplitude comparison function based on its transmission and reflection responses allows identification of unknown RF frequencies above 30 GHz.
We report on our recent experiments of a 50.5 nJ, 750 fs ultra-stable dissipative soliton fiber laser in the presence of Raman scattering in a long ring cavity. We demonstrated that a transition from noise-like soliton to stable dissipate soliton took place at sufficiently high pulse energy.
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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