多波长相干光注入锁定的波长跟踪自动化控制

Automatic wavelength tracking control for multi-wavelength coherent optical injection locking

本文基于全网光同步的超密集波分复用无源光网络(ultra-dense wavelength division multiplexing passive optical network,UDWDM-PON),对多波长注入锁定的稳定性进行了研究,提出了一种波长跟踪控制方法:用光电探测器(photo-diode,PD)接收从激光器(slave laser diode,SLD)的光信号并进行滤波与检波处理,所得信号用于建立SLD参数分布模型并进行线性扫描控制。该方法经基于LabVIEW程序控制与数据采集(data acquisition,DAQ)的仪器实验验证后,对相关驱动电路进行了模块化改良,采用基于微控制单元(microcontroller unit,MCU)的控制,使得该控制模块具有更高控制精度、更易封装的特点,从而能更好应用于多波长光的多路注入锁定当中。本文采用主动锁模激光器(mode-locked laser,MLL)作为多波长光源,对双路SLD的注入锁定进行了验证与对照实验,结果表明:在相同注入条件下,采用波长跟踪控制模块的注入锁定组具有更佳的稳定性。

Based on the wavelength synchronous ultra-dense wavelength division multiplexing passive optical network(UDWDM-PON),a wavelength tracking control method based on signal detected by photoelectric detector(PD)for multi-wavelength optical injection locking is proposed.Specifically,the distribution model of the slave laser(SLD)parameter is established by filtering and detecting the output signal from PD,which is used for the linear scanning control.After the confirmatory experiment with LabVIEW control and data acquisition(DAQ),the control module is reformed by microcontroller unit(MCU)and driving circuit to improve the control precision and encapsulation,so that it can be well applied in multi-channel injection locking.Two-channel injection locking test with two distribute-feedback laser is compared,which using the actively mode-locked laser(MLL)as a multi-wavelength source.It turned out that the slave laser controlled by wavelength tracking module showed better stability under the same injection conditions.