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提出一种新型四倍频技术用于单边带光载毫米波信号的产生。该技术使用一个双平行马赫曾德尔调制器(DPMZM)实现四倍频的单边带调制,通过微波移相和双平行马赫曾德尔(MZ)调制器偏置点控制,产生出包含载波边带和两个二阶边带的光谱,用光滤波器滤除光载波后得到频率为四倍微波本振频率的光载毫米波信号。基于上述技术,搭建了光载射频(RoF)传输实验系统,该RoF系统用10GHz微波源产生了40GHz的光载毫米波并承载了1 Gb/s的基带数据。实验结果表明,光载毫米波信号经20km标准单模光纤传输后,功率代价仅为0.8dB。
Proposed a new quadruple frequency technology for single-side optical millimeter-wave signal generation. The technology uses a dual parallel Mach-Zehnder modulator (DPMZM) to achieve quadruple-frequency single-sideband modulation, which is controlled by the microwave phase-shift and dual parallel Mach-Zehnder (MZ) modulator bias points, And two second-order sidebands, the optical carrier is filtered by an optical filter to obtain an optical millimeter-wave signal with a frequency of four times the local oscillation frequency of the microwave. Based on the above techniques, an experimental system of optical carrier radio frequency (RoF) transmission was set up, which produced 40GHz optical millimeter wave with 10GHz microwave source and carried 1Gb / s baseband data. The experimental results show that the optical power millimeter wave signal transmitted by 20km standard single-mode optical fiber, the power cost is only 0.8dB.