A Phase-Modulated Microwave Photonic Link With an Extended Transmission Distance


A novel technique to move a microwave signal over an optical fiber primarily based on section-modulation and coherent in-part (I) and quadrature-section (Q) demodulation with an extended transmission distance is proposed and experimentally demonstrated. In the transmitter, a Sagnac loop incorporating a section modulator (PM) is employed to generate two orthogonally polarized optical signals with one being phase modulated and the opposite with no modulation that acts as a remote optical reference signal. The orthogonally polarized optical signals are transmitted over one-mode fiber (SMF) to a polarization and phase diversity coherent receiver, and are coherently detected with a free-running optical native oscillator at the receiver. Since the part-modulated and therefore the reference signals are transmitted over the same SMF, the optical phases are correlated, and the first signal can be recovered based mostly on a digital signal processing algorithm. The proposed technique is experimentally evaluated. Compared with a part-modulated coherent I/Q demodulated link without using an optical phase correlated reference signal, the transmission distance is extended from 50 m to 10 km, while providing a link gain and a spurious-free dynamic range (SFDR) of -9.five dB and a hundred and fifteen.8 dB · Hz2/3, respectively.

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