We propose a flexible dual-pattern communication system based on the existing intensity modulation and direct detection system, which exploits the wavelength tuning characteristic of the distributed Bragg reflector (DBR) laser. At the transmitter side of the system, the DBR laser is wavelength tuned by the wavelength coding signal and intensity modulated by the radio frequency (RF) signal. At the receiver side, the RF signal is detected directly by photodetector 1, while the wavelength coding signal is recovered by a specific optical filter. The proposed system is theoretically analyzed and verified at the C band experimentally. We successfully obtained clear eye openings for the 10- and 25-Gb/s nonreturn-to zero signal. The waveform graphs of the 10- and 100-kHz wavelength coding signal were also measured. The two transmission patterns did not interfere with each other no matter in the back-to-back or 5 km case.
We study the phase requirement in phased-array antennas. Firstly, we present a tunable and wideband microwave photonic phase shifter based on polarization-dependence of the LiNbO3 Mach-Zehender modulator (MZM).With the proposed device, the phase of the optical microwave signal output from the polarizer can be tuned from 0 to 360 degree by simply adjusting the polarization direction of the lights whereas the amplitude keeps constant. A full range tunable phase shifting in the frequency range of 10 - 35 GHz is achieved. Secondly, we focus on the photodetector (PD) phase response with different input optical power and different PD. We study the Phase Retardation in InGaAs Photodetectors. The phase response of different PDs will affect the phased-array antennas.
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