A microwave photonic link with high spurious-free dynamic range based on a parallel structure |
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Authors: | WANG Shi-kui GAO Yong-sheng WEN Ai-jun and LIU Ling |
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Institution: | TONG Zheng-rong;HU Gui-bin;CAO Ye;ZHANG Wei-hua;Key Laboratory of Film Electronics and Communication Devices and Key Laboratory of Intelligent Computing and Novel Software Technology, Tianjin University of Technology; |
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Abstract: | A microwave photonic link (MPL) with high spurious-free dynamic range (SFDR) is proposed and analyzed. The optical carrier is divided equally into two paths. The path 1 is modulated by radio frequency (RF) signals in a Mach-Zehnder modulator (MZM), and the phase of path 2 is controlled before the combination with path 1. By properly adjusting the phase difference of the two paths with the optical phase shifter, the third-order intermodulation distortion (IMD3) can be significantly suppressed. A proof-of-concept simulation is carried out. The results show that a reduction of 40 dB in the IMD3 and an improvement of 21.1 dB in the SFDR are achieved as compared with the conventional MZM-based MPL. The proposed MPL shows the advantages of simple structure, low cost and high efficiency. |
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