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A simple broadband and linear photonic RF phase shifter is proposed and experimentally demonstrated based on distributed Bragg reflector (DBR) fiber lasers and polarization sensitive effect of optical phase modulator. Photonic RF signal sources with frequency range from 1.6186-GHz to 3.7016-GHz are investigated. The full 360° phase shift of the broadband photonic RF signals can be achieved and tuned...
Ultra-fine optical spectrum microscope is demonstrated based on optical channel estimation using coherent optical OFDM signals and optical spectrum fusion technique. The frequency resolution and measurement range of this technique are 10.7-MHz and 250-GHz respectively.
In this paper, we demonstrated a digital predistortion (DPD) algorithm to linearize an electro-absorption modulated laser (EML) used to modulate a 40-Gbps orthogonal frequency division multiplexing (OFDM) signal onto an optical carrier. We characterized the EML as a nonlinear model based on memoryless polynomials. The nonlinear coefficients were estimated by a linear method. And the predistortion...
Synthesizing automatic control system of high voltage substation is a principal constituent of the distribution automation in power system now. The paper discussed soft & hardware structure graphs of some main module (correspondence module, Data acquisition module, Supervisory control & measure module, Correspondence management module). Based on this, the paper introduced the main structure...
A simple switchable microwave frequency generator based on a multi-wavelength fiber grating laser is proposed and demonstrated. Microwave signal of 10.4 GHz, 21.2 GHz, and 31.6 GHz can be obtained by simple adjustment of a polarization controller.
A new energy integration detection scheme is proposed to detect a nonlinear frequency modulate (FIM) embedded in strong complex additive white Gaussian noise (CAWGN). In this scheme, the optimal kernel of Cohen's time-frequency distribution (TFD) is designed to realize local coherent integration of a signal. Thresholding and morphological filtering are used to extract the time-frequency (TF) support...
Interference statistic characteristic is theoretically analyzed in ship-based passive synthetic impulse and aperture radar (SIAR) scenario. Covariance matrix at interested range bin is estimated using echoes from some positive and all negative frequency range bins after stretching with cosine weight for co-channel interference suppression. Thereafter, Karhunen-Loeve transformation is applied to the...
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