A5084915535- Advanced Photonic Communication Systems
- Optical Network Technologies
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- PAPR reduction in OFDM
- Advanced Fiber Optic Sensors
- Optical Wireless Communication Technologies
- Semiconductor Lasers and Optical Devices
- Full-Duplex Wireless Communications
- Orbital Angular Momentum in Optics
- Advanced Optical Network Technologies
- Optical Coherence Tomography Applications
- Random lasers and scattering media
- Advanced Optical Sensing Technologies
- Millimeter-Wave Propagation and Modeling
- Radar Systems and Signal Processing
- Adaptive optics and wavefront sensing
- Image and Signal Denoising Methods
- Antenna Design and Optimization
- Robotic Path Planning Algorithms
- Power Line Communications and Noise
- Distributed Control Multi-Agent Systems
- Photonic Crystal and Fiber Optics
- Telecommunications and Broadcasting Technologies
- Surface and Thin Film Phenomena
Beijing University of Posts and Telecommunications
2015-2024
State Key Laboratory of Information Photonics and Optical Communications
2015-2024
Peking University
2013
We have theoretically investigated the transmission performance of optical millimeter-waves (mm-waves) generated using intensity modulation via a Mach-Zehnder modulator, with double and single sidebands (DSB SSB) carrier suppression (OCS) schemes. According to our theoretical analysis, fiber chromatic dispersion leads fading effect time shifting codes; therefore, signals are greatly degraded. Of all signals, DSB mm-wave suffers from both codes. However, mm-waves by SSB OCS schemes immune...
Atmospheric turbulence is a major challenge for practical orbital angular momentum (OAM)-based free-space optical (FSO) communication systems that causes intermodal crosstalk and degrades the performance of system. Herein, we propose hybrid input-output algorithm (HIOA)-based adaptive optics (AO) system to compensate distorted OAM beams. The principle parameters HIOA-based AO in an OAM-based FSO are analyzed, discussed. simulation results indicate can effectively correct beams HIOA improves...
What we believe to be a new scheme generate an optical millimeter wave with octupling of the local oscillator via nested LiNbO<sub>3</sub> Mach-Zehnder modulator (MZM) is proposed and implemented by numerical simulation. Since response frequency are largely reduced, bandwidth requirement transmitter electrical components reduced greatly. Then, parameters analyzed theoretically, find that both extinction ratio MZM phase imbalance between its two arms have influence on performance generated wave.
A simple signal-to-signal beat interference cancellation receiver based on balanced detection (ICRBD) with an interleaver, a 2×2 three-decibel optical coupler, and photodiode pair is proposed for single-sideband orthogonal frequency division multiplexing (SSB-OOFDM) signal reduced guard band (GB). Simulation demonstration of the ICRBD 40 Gbit/s 16-QAM SSB-OOFDM GB was achieved successfully.
A scheme to implement the full-duplex radio-over-fiber (RoF) link by quadrupling frequency of electrical RF carrier without a lightwave source at remote base station (RBS) is proposed. Not only does reduce complexity RBS and its requirement for devices, but generated optical millimeter-wave (mm-wave) signal also has good transmission performance because both fading effect bit walk-off caused fiber dispersion are avoided. 5 Gbit/s full duplex RoF simulation with 40 GHz mm-wave built. It shows...
Recently, orbital angular momentum (OAM) beams have been applied in underwater optical communication (UWOC) to build a high-capacity link. However, wave-front-sensitive OAM beam suffers significant distortion due oceanic turbulence (OT), resulting considerable intermodal crosstalk that degrades the UWOC performance. Herein, we propose and demonstrate an adaptive optics (AO)-based correction approach with phase retrieval algorithm (PRA) compensate for distorted induced by OT. In simulation,...
Fiber bend is a major challenge of multimode fiber (MMF) imaging. More robustness against demonstrated in compressive MMF imaging using mean speckle patterns captured at multiple potential bending configurations beforehand, rather than sticking to single initial configuration. Experiments demonstrate an overall quality improvement on recovered images previous work, which important for robust endoscopic application.
A full-duplex radio over fiber link scheme with 16 quadrature amplitude modulation (16-QAM) 10 Gb/s downstream and 2.5 upstream signals is proposed. In the downlink, 60 GHz dual-tone optical millimeter- (mm-) wave signal carrier generated by 15 local oscillator via a Mach–Zehnder modulator frequency quadrupling. The 16-QAM 5 IF up-converted to 65 modulating it on one of two tones single-sideband (SSB) at central station. At remote base station, SSB mm-wave detected high-speed photodiode....
An approach to generate an optical millimeter wave is introduced with frequency octupling using two cascaded polarization modulators followed by polarizers, respectively. By adjusting the modulation indexes of modulators, only ±4th-order sidebands are generated a pure spectrum. Since no filter needed, proposed technique can be used frequency-tunable large range. To prove feasibility approach, simulation conducted 80-GHz wave, and then its transmission performance checked.
A novel dual-tone quadrature phase-shift keying (QPSK) optical millimeter (mm)-wave signal generation by frequency nonupling the radio-frequency QPSK via an phase modulator (PM) without precoding is proposed. To enable generated mm-wave to resist fiber chromatic dispersion degradation, unmodulated -fourth-order and QPSK-modulated +fifth-order sidebands are abstracted from sidebands, considering periodicity of a signal. The opto-electrical conversion efficiency maximized optimizing modulation...
This paper presents a simple photonic-assisted instantaneous microwave frequency measurement approach with an adjustable range. In our scheme, different polarization processing is performed on the upper and lower branches, then powers of two branches are compared to obtain amplitude comparison function (ACF), which provides frequency-amplitude mapping. The system significantly simplified since only one modulator (PolM) single laser source required. addition, scheme achieves larger ACF slope,...
A novel, to the best of our knowledge, scheme based on a dual-drive Mach-Zehnder modulator (DDMZM) is proposed for Doppler-frequency-shift (DFS) and angle-of-arrival (AOA) measurement without direction ambiguity. The echo signal from one antenna coupled with local oscillator then fed into upper RF port DDMZM, other directly its lower port. generated two first-order optical sidebands are separated by an interleaver form channels detected identical low-speed photodiodes, so both magnitude...