可调谐半导体激光器波长检测与控制的研究

发布时间：2018-06-30 11:03

本文选题：可调谐半导体激光器 + 激光器波长稳定　；参考：《华中科技大学》2015年硕士论文

【摘要】：可调谐半导体激光器是下一代动态光网络的关键器件之一。在动态光网络中,要求标准ITU-T通道的光组和光包的长度在100ns到10ms范围内。因此,可调谐激光器的波长稳定性对其在静态光网络、未来光分组交换(OPS)和光突发交换(OBS)网络中的应用非常重要。一种有效的波长稳定方法是根据输出光信号经过光滤波,例如布拉格光纤光栅,波导阵列光栅或F-P标准具后得到的反馈波长漂移信号,通过调谐激光器相位节对波长漂移进行补偿。本文主要研究这种波长锁定环路对可调谐激光器的快速波长检测与控制。主要工作可分为以下几个部分:简要分析了分布式布拉格反射(DBR)型半导体激光器的结构和波长调谐原理,并由此引出了波长检测和波长控制系统的结构原理。分析了由快速波长切换引起的热效应,并阐述了多节DBR可调谐激光器无模式跳变的波长锁定原理。根据光学和现代控制理论建立了关于波长反馈锁定环路系统的线性连续控制理论模型,利用该模型和更真实的数值仿真模型先后对系统进行了分析,通过仿真得到环路最优比例积分微分(PID)控制系数。研究了PID参数与波长锁定的关系,并分析了系统带宽对系统性能的影响。设计开发了基于FPGA的控制电路板,实现了开发板对取样光栅分布式布拉格反射(SGDBR)激光器的波长控制和波长检测。通过对FPGA内部编程,实现了对SGDBR激光器的快速锁定,并对锁定的精度,长期稳定性和锁定时间进行了测量分析。可调谐激光器波长反馈环路系统的理论和实验研究结果,可以给应用在未来动态光网络中的可调谐半导体激光器的波长稳定系统设计提供参考。
[Abstract]:Tunable semiconductor laser is one of the key devices in the next generation dynamic optical network. In dynamic optical networks, the length of optical groups and packets of the standard ITU-T channels is required to range from 100ns to 10ms. Therefore, wavelength stability of tunable lasers is very important for their applications in static optical networks, future optical packet switching (OPS) and optical burst switching (OBS) networks. An effective wavelength stabilization method is to obtain feedback wavelength drift signals based on output optical signals, such as fiber Bragg gratings, waveguide arrays gratings or F-P standards. Wavelength drift is compensated by tuning laser phase knots. This paper focuses on the fast wavelength detection and control of the tunable laser with this wavelength locking loop. The main work can be divided into the following parts: the structure and wavelength tuning principle of distributed Bragg Reflectance (DBR) semiconductor laser are analyzed, and the structure principle of wavelength detection and wavelength control system is derived. The thermal effect caused by fast wavelength switching is analyzed, and the wavelength locking principle of multisection DBR tunable laser without mode jump is described. According to the optical and modern control theory, the linear continuous control model of the wavelength feedback locked loop system is established. The system is analyzed successively by using this model and the more realistic numerical simulation model. The loop optimal proportional integral differential (pid) control coefficient is obtained by simulation. The relationship between pid parameters and wavelength locking is studied, and the influence of system bandwidth on system performance is analyzed. The control circuit board based on FPGA is designed and developed. The wavelength control and wavelength detection of sampled grating distributed Bragg Reflectance (SGDBR) laser are realized. The fast locking of SGDBR laser is realized by programming the FPGA, and the precision, long-term stability and locking time of the lock are measured and analyzed. The theoretical and experimental results of the tunable laser wavelength feedback loop system can provide a reference for the design of the tunable semiconductor laser wavelength stabilization system in the future dynamic optical network.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248.4

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