一种提高基于循环频移器的多载波光源光信噪比的方案

刘娜; 席丽霞; 李建平; 张晓光; 田凤; 周浩

信息光子学与光通信国家重点实验室,北京邮电大学,北京100876

A scheme for improving optical signal-to-noise ratio of multi-carrier source based on recirculating frequency shifter

摘要: 频率锁定多载波光源是实现太比特系统传输的关键器件之一，目前已成为光纤通信领域的研究热点．基于循环频移技术产生的频率锁定多载波光源因具有驱动电压低、串扰小、平坦度高的优点而受到重视，但是其输出质量容易受到调制器固有的高阶谐波串扰的影响，特别是三阶谐波串扰．为了减小三阶串扰的影响，本文提出了在I／Q调制器两支路上再加载另～频率为3fm的射频信号的方案，用其产生的一阶信号来抑制三阶串扰．通过理论分析与数值仿真，得到了载波数为24、载波间最大功率差小于0．1dB的多载波光源输出．与未采用三阶串扰抑制方案的结果比较，光源输出有效光信噪比提高了2dB．结果表明，采用本文的改进方案，可以有效地提高多载波光源的输出平坦度和有效光信噪比．

关键词:

Abstract: The output quality of frequency-locked multi-carrier source based on recirculating frequency shifter （RFS） technology is easily influenced by the inherent high-order harmonic crosstalk of modulator, especially the third-order crosstalk. In order to reduce the third-order crosstalk, a scheme that another RF signal whose frequency is 3fro is loaded on both ports of I/Q modulator is adopted. The first-order signal it produces is used to suppress the third-order crosstalk. A multi-cartier source whose number is 24 and maximal power difference is smaller than 0.1 dB is achieved through theoretical analysis and simulation research. The effective optical signal-to-noise ratio （OSNR） of multi-carrier source is improved by 2 dB compared with that before using the scheme of suppressing third-order crosstalk.

一种提高基于循环频移器的多载波光源光信噪比的方案

信息光子学与光通信国家重点实验室,北京邮电大学,北京100876

关键词:

A scheme for improving optical signal-to-noise ratio of multi-carrier source based on recirculating frequency shifter

信息光子学与光通信国家重点实验室,北京邮电大学,北京100876

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