The phase shifter is the key component for phased array systems. However, the previously proposed microwave photonic phase shifter always has a complex structure and is difficult to operate. In this paper, a simple microwave photonic phase shifter based on waveplate rotation is proposed. It is composed of a cascaded quarter-wave plate (QWP) and a half-wave plate (HWP), the QWP is used to control the amplitude and HWP is adopted to control the phase of the microwave signal. By fixing the rotating angle of QWP, the phase of the microwave signal will be linearly changed with the rotation angle of the HWP. Compared with other schemes, the proposed method is easy to use. A proof-of-concept experiment is performed. Experimental result shows that a wide phase shift range of 542.38° can be realized and the power fluctuation can be within 0.47 dB. For a 360° phase shift, the power fluctuation can be maintained within 0.33 dB.
KEYWORDS: Frequency conversion, Microwave photonics, Single mode fibers, Digital signal processing, Antennas, Modulation, Telecommunications, Signal processing, Optical signal processing, Modulators
Microwave photonic frequency conversion and transmission is highly needed in modern distributed communication systems. However, the periodically power fading and co-frequency interference limits the working frequency range, transmission distance, and the number of channels. To address the above questions, a novel dual-channel microwave photonic frequency conversion and transmission method is proposed. A DPol-DPMZM modulator is applied and the dual-channel intermediate frequency (IF) signals and the local oscillator (LO) signal are both applied to the DPol-DPMZM modulator to produce optical sidebands of IF and LO signals. Through the jointly manipulate phase of optical sidebands, the periodically power fading and co-frequency interference problems can be simultaneously addressed, which guarantees the broadband and multi-channel performance of microwave photonic frequency conversion and transmission system.
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