非线性偏振旋转被动锁模光纤激光器自动锁模电路

易波; 贾文; 徐军; 陈国梁; 梅理

doi:10.3788/OPE.20132112.2994

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非线性偏振旋转被动锁模光纤激光器自动锁模电路

现代应用光学 | 更新时间：2020-08-12

- 非线性偏振旋转被动锁模光纤激光器自动锁模电路
- Automatic mode-lock circuit applied on NPR passive mode-locked fiber laser
- 光学精密工程 2013年21卷第12期页码：2994-3000
- 作者机构：
  
  中国科学技术大学物理学院,安徽合肥,230026
- 作者简介：
- 基金信息：
  
  安徽省教育厅人才基金();中国科学技术大学2012年青年创新基金()
- DOI：10.3788/OPE.20132112.2994
  中图分类号： TN248.1
- 收稿日期：2013-04-19，
  
  修回日期：2013-06-25，
  
  网络出版日期：2013-12-25，
  
  纸质出版日期：2013-12-25
- 稿件说明：
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易波, 贾文, 徐军, 陈国梁, 梅理 . 非线性偏振旋转被动锁模光纤激光器自动锁模电路[J]. 光学精密工程, 2013,21(12): 2994-3000

YI Bei, GU Wen, XU Jun, CHEN Guo-Liang, MEI Li- . Automatic mode-lock circuit applied on NPR passive mode-locked fiber laser[J]. Editorial Office of Optics and Precision Engineering, 2013,21(12): 2994-3000
易波, 贾文, 徐军, 陈国梁, 梅理 . 非线性偏振旋转被动锁模光纤激光器自动锁模电路[J]. 光学精密工程, 2013,21(12): 2994-3000 DOI： 10.3788/OPE.20132112.2994.

YI Bei, GU Wen, XU Jun, CHEN Guo-Liang, MEI Li- . Automatic mode-lock circuit applied on NPR passive mode-locked fiber laser[J]. Editorial Office of Optics and Precision Engineering, 2013,21(12): 2994-3000 DOI： 10.3788/OPE.20132112.2994.

摘要

针对基于非线性偏振旋转（NPR）原理的被动锁模光纤激光器稳定性差和不能自行进入锁模状态的问题，本文设计了自动锁模电路

用于对激光器进行实时调控以获得稳定的锁模输出。该项设计利用高速光电探测器（PD）将NPR被动锁模光纤激光器输出的光信号转化为电脉冲信号，经过线性放大、整形处理后输出至单片机进行计数；单片机根据快速锁模判定算法判断该激光器的输出状态，并自动反馈调节加装在光纤激光器上的电控偏振控制器（PC），从而实现激光器的锁模稳定状态输出。实验结果表明，对于重复频率为6.238 MHz的NPR被动锁模激光器，自动锁模电路能够在6 ms内检测到失锁状态，在最长10.24 s内自动搜索达到稳定锁模工作状态。对于重复频率在16 MHz以下的NPR被动锁模激光器，自动锁模电路都能够快速地实现自行启动或将启动后因故失锁的状态调节回锁模状态，达到预先的设计要求，具有结构简单、成本低、功耗低及性能稳定等优点。

Abstract

As passively modelocked fiber lasers based on Nonlinear Polarization Rotation(NPR) have the problem of low stability and difficulty to selfstart into a modelocking state during operation

an online automatic modelock circuit was designed to adjust the laser in real time to get a stable modelocked output. In the design

the signal from NPR passively modelocked laser was transformed to an electrical pulse signal with a high speed photoelectric detector

and it was amplified and shaped linearly to be received by the Micro Computer Unit(MCU) to count. Then the MCU distinguished the state of the laser based on quick modelock judge algorithm and adjusted the electric controlled polarization controller (PC) on the fiber laser automatically. The experiment results show that for the NPR modelocked fiber laser with a repetition rate of 6.238 MHz

the automatic modelock circuit can distinguish the losing lock in 6 ms

and can find and get into the modelock state in 10.24 s automatically. For NPR passive modelocked fiber lasers with repetition rate lower than 16 MHz

this automatic modelock circuit can get into a stable modelocked state quickly or restart immediately if the modelock state is lost for some reasons，which reaches the design requirements and shows advantages of simple structures

low costs

low powers

and high reliability.

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references

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