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一频率为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0.1 dB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2 dB.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.
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.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第17期292-299,共8页
Acta Physica Sinica
基金
高等学校博士学科点专项科研基金(批准号:20110005110014)
北京邮电大学青年创新专项基金(批准号:BUPT2011RC009)
北京邮电大学优秀博士生创新基金(批准号:CX201121)
深圳市科技研发资金基础研究计划(批准号:JC201105191003A)资助的课题~~
关键词
光纤通信
多载波光源
循环频移器
三阶串扰
optical fiber communication, multi-carrier source, RFS, third.order crosstalk
作者简介
E—mail：xilixia@bupt．edu．cn
