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17 April 2019 Frequency-doubling microwave signal generation with tunable phase shift based on DP-QPSK modulator
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Abstract
A novel system for frequency-doubling microwave signal generation with tunable phase shift based on a dual-polarization quadrature phase shift keying (DP-QPSK) modulator which includes two dual-parallel Mach-Zehnder modulators (DPMZM) is proposed and demonstrated. The radio frequency (RF) signals drive the top DPMZM for generating a negative first-order RF sideband on the X-polarization state and drive the bottom DPMZM to obtain a positive first-order RF sideband on the Y-polarization state. After that, the two first-order sidebands enter a three wave-plates polarization controller (PC) of half-quarter-quarter (HQQ) wave plate type and then their phases are controlled. After a polarizer and a photodiode (PD), a frequency-doubling microwave or millimeter-wave signal with tunable phase shift is produced. The results indicate a full 360-degree phase shift is realized, in the meantime, the phase deviation is less than 1-degree and amplitude deviation is no more than 0.3dB.
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Conghui Zhang, Xinjing Qiu, Caili Gong, Yongfeng Wei, and Xinlu Gao "Frequency-doubling microwave signal generation with tunable phase shift based on DP-QPSK modulator", Proc. SPIE 11071, Tenth International Conference on Signal Processing Systems, 110710C (17 April 2019); https://doi.org/10.1117/12.2520719
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