Frequency shift elimination method based on multi-wavelength relevant optical communication system

一种基于多波长相关光通信系统的频率偏移消除方法

Abstract

一种基于多波长相关光通信系统的频率偏移消除方法,涉及光通信系统领域,通过在接收端未经调制的参考光进入90°混频器的本振输入端,其对应波长的本振光进入90°混频器的信号输入端,经过光电转换后,得到与经过光电转换后的其他波长的电信号频率偏移相反的电信号,在电域中利用该电信号分别与经过光电转换后的其他波长的电信号进行相乘,有效消除了经过调制后的光载波和对应的本振光的频率偏移,可对大范围的频率偏移进行纠正消除,提升了系统对频率偏移量可容忍度,且系统对激光器数量的需求小,对应的波分复用系统结构相对简单,相干接收端光端也无需锁相环或者自动频率控制等反馈装置,其结构也得到了简化,节约了系统成本。
The invention discloses a frequency shift elimination method based on a multi-wavelength relevant optical communication system and relates to the field of an optical communication system. Reference light which is not modulated at a receiving end enters the local oscillation input end of a 90-degree mixer; local oscillation light with a wavelength corresponding to the reference light enters the signal input end of the 90-degree mixer; after photoelectric conversion, an electrical signal with frequency shift opposite to that of electrical signals with other wavelengths subjected to photoelectric conversion is obtained; and in an electric field, the electrical signal is respectively multiplied by electrical signals with other wavelengths subjected to photoelectric conversion to effectively eliminate the frequency shift of a modulated light carrier and the corresponding local oscillation light. The method can be used for correcting and eliminating large-scale frequency shift, the tolerance degree of the system to the frequency shift can be improved. In addition, the system has low requirements on the amount of lasers; a corresponding wavelength division multiplexing structure has relatively simple structure; an optical terminal of a coherent receiving end does not need feedback devices, such as phaselocked loops, automatic frequency control devices and the like; the structure of the multi-wavelength relevant optical communication system is simplified; and system cost is saved.

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