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High radio-frequency phase-coded waveform generation based on dispersion-compensated optoelectronic oscillator (DCOEO) is proposed and experimentally demonstrated. The carrier frequency range of the generated phase-coded microwave, which exactly varies from 4 GHz to 45 GHz, can cover Ka band for Radar applications.
The attractive use of microwave photonic (MWP) technologies brings about immense benefits to the field of optical sensing. Recent new developments in microwave photonic signal processing techniques that have high potentialities to be used in a variety of sensing applications are presented in the paper, including exploring the use of finite impulse response MWP filters for distributed sensing applications,...
In this paper, a fiber-optic sensing system for simultaneous measurement of temperature and transversal loading based on a fiber-ring microwave photonic filter (MPF) has been proposed and experimentally demonstrated. The temperature variation will induce the central frequency shift of the MPF's passband, while the micro-bend loss induced by transversal loading will cause the change of extinction ratio...
This paper presents TRx modules based on microwave photonics developed by Tsinghua University and their application in ISAR. The Tx module is based on OAWG, and can produce signal with arbitrary waveforms on the demand with its frequency tuneable from GHz to 100GHz. its bandwidth up to 10GHz, and its maximum duration up to the order of millisecond. The Rx is a coherent frond end with its central frequency...
Strong optical injection into a distributed feedback (DFB) semiconductor is a method to realize a single bandpass microwave photonic filter (MPF). But the out of band suppression ratio (OSSR) is limited by the four wave mixing (FWM) effect, and the 3 dB bandwidth is too large for microwave signals. To improve the OSSR and narrow the 3 dB bandwidth of the MPF, a novel single bandpss MPF based on weak...
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 dual-passband microwave photonics filter (MPF) for fiber axial measurement is proposed and experimentally demonstrated. The MPF is mainly implemented using a phase modulator (PM) and two cascaded fiber Bragg grating Fabry-Perot (FBG-FP) filters with different central wavelengths. According to the phase-modulation to intensity-modulation (PM-IM) conversion in the MPF, dual-passband can be generated...
A novel broadband and scalable RF switch matrix based on microwave photonics is proposed and the proof-of-concept experiments are carried out. The experiment results show that the proposed RF switch matrix is with a good linearity, link gain, port isolation and EVM performance.
We propose a method to design and implement the microwave photonic filter with rectangular response by using the frequency comb, spatial light modulator-based spectrum shaper and dispersive element. Numerical results are presented to verify the proposed scheme.
A microwave photonic based RF interference cancellation scheme is proposed to compensate for wideband phase changes of the interference signals, in which microwave photonic phase shifter is particularly employed. In the proposed cancellation scheme, a known interferer is delayed, attenuated, phase shifted so as to be subtracted from the received signal at the output. The microwave photonic phase shifter...
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