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相位偏移和分束比极大地影响了产生光毫米波信号的边带抑制比以及光纤无线(ROF)系统的BER。针对串联两个马赫-曾德尔调制器产生八倍频光毫米波信号的方案,利用贝塞耳级数展开的方法,推导了相位偏移和分束比影响下,光毫米波信号的严格通用解析解,当分束比偏离0.001,相位偏移1°时,边带抑制比可达35.9 dB,能够忽略谐波分量的影响。仿真结果表明,在BER=10-10的条件下,当八倍频光毫米波信号背靠背传输时,分束比偏离0.001和相位偏移1°的功率代价仅为0.001dB,经20 km标准单模光纤传输后的功率代价为0.145 dB,系统性能良好。
The phase offset and split ratio greatly affect the sideband suppression ratio and optical fiber-to-radio (ROF) system BER that produces optical millimeter-wave signals. Aiming at the scheme of producing octave optical millimeter wave signal by connecting two Mach-Zehnder modulators in tandem, the strict common use of optical millimeter-wave signal under the influence of phase shift and beam splitting is derived by using the method of Bessel series expansion. Analytical solution, when the splitting ratio deviation of 0.001, the phase shift of 1 °, the sideband suppression ratio up to 35.9 dB, can ignore the impact of harmonic components. The simulation results show that when the octave-frequency optical millimeter-wave signal is transmitted back-to-back under the condition of BER = 10-10, the power cost of splitting ratio deviation 0.001 and phase offset 1 ° is only 0.001dB, Modem fiber transmission power cost of 0.145 dB, the system performance is good.