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A photonic scheme to generate microwave signals with hybrid pulse-position modulation and binary phase shift keying format is proposed and experimentally demonstrated. Hybrid PPM-BPSK signals with 0.1ns symbol period and 20GHz carrier frequency are obtained.
A photonic scheme to act as microwave digital synthesizer based on a tunable polarization diversified comb filter and the process of frequency-to-time-mapping is proposed and experimentally demonstrated. 2-ASK/PSK/FSK signals are generated with tunabilities in the bit-rate, duty-cycle and carrier frequencies.
A photonic-assisted microwave phase shifter using phase modulator and fiber-Bragg-grating in a round trip configuration is proposed. The phase of 20∼30 GHz microwave signals can be shifted by properly adjusting the voltage of PM-driving signal.
Multiform spectral shaping schemes to provide tunability on the shape, free spectral range and bandwidth of microwave photonic signals are reviewed. By utilizing specific dispersion-based conversion techniques, the proposed scheme scan be widely used to achieve flexible manipulation of microwave signals.
Manipulation of optical signals with tunablity and reconfigurability is essential for high-speed systems or networks. We review tunable photonic microwave signal generation and filtering, followed by all-optical signal processing in polarization-division-multiplexed systems.
A photonic comb filter with digitally tunable bandwidth and frequency spacing is proposed. Using cascaded differential-group-delay (DGD) element and polarization switch based filters, we demonstrate independent tunability of both parameters with >; 12-dB first-sidelobe reduction for a 6-bit configuration. Limitations of such an approach are also discussed.
A synthesis scheme to generate microwave triangular-shaped pulses based on spectral shaping and frequency-to-time mapping is proposed. Triangular-shaped signals with periods of 0.2ns, 0.4ns, 1.6ns and pulse widths of 0.13ns, 0.35ns are demonstrated.
A novel approach to generate frequency and pulse-width adjustable carrier signals using all-fiber components is proposed and demonstrated. The technique is using an all-fiber spectrum shaper which is consisted of a variable differential group delay (DGD) element and a bandwidth-tunable optical filter, to produce required optical power spectrum. Due to the frequency-to-time conversion in a dispersive...
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