基于光注入1550 nm-VCSEL产生窄线宽微波信号

发布时间：2018-03-23 16:47

本文选题：1550　切入点：nm-VCSEL　出处：《西南大学》2017年硕士论文

【摘要】：光载无线通信(Radio-over-Fiber,RoF)技术是将无线通信与光纤通信有效结合的一种新兴通信技术,而光子微波的获取技术是其领域的研究热点。在众多的光子微波获取方案中,基于光注入边发射半导体激光器(Edge Emitting Semiconductor Lasers,EESLs)呈现的单周期振荡获取光子微波的方案受到额外关注。采用该方案所产生的微波信号具有频率可调谐、光谱具有单边带结构等优势,但微波信号的线宽比较宽,需进一步引入频率稳定技术进行窄化。相比于传统的EESLs而言,垂直腔表面发射激光器(Vertical-Cavity Surface-Emitting Lasers,VCSELs)具有体积小、阈值低、与光纤易于耦合等优势,因此基于光注入VCSELs获取微波信号的方案更具应用前景。本文提出了基于平行偏振光注入1550 nm-VCSEL呈现的单周期非线性动力学态来获取光子微波信号,并实验研究了光电负反馈的引入对所产生的微波信号的特性影响。研究结果表明:通过调节注入光的注入强度以及注入光的频率,1550nm-VCSEL在平行偏振光注入下可呈现出注入锁定(SIL)、单周期(P1)、倍周期(P2)、混沌(CO)多种丰富的动力学状态;对于特定的频率失谐,1550 nm-VCSEL在较大的注入功率范围内均可呈现单周期振荡,在合适的注入光强度下,平行偏振光注入1550 nm-VCSEL可产生光谱具有单边带结构、频率高于10 GHz的光子微波信号,但由于激光器中存在固有位相噪声,导致该微波信号的线宽达到了几十MHz量级,影响信号在通信系统中的长距离传输;进一步引入光电负反馈对微波信号线宽进行窄化,在选取合适的光电反馈强度后,可将该微波信号的线宽从无反馈时MHz量级降低至一百多kHz(减小了两个数量级以上),且信号的信噪比为40.7dB,其原因是由于光电反馈环中延时重复的微波信号对单周期振荡的锁定作用;另外,在固定反馈强度与其它的系统参量,只改变注入光的注入功率即可获得频率在一定范围内连续可调谐的窄线宽微波信号。
[Abstract]:Optical wireless communication (Radio-over-Fiber, RoF) technology is a new effective communication technology combined with wireless communication and optical fiber communication technology, and the acquisition of photonic microwave is a hot research field. In the numerous photonic microwave acquisition scheme, edge emitting semiconductor laser based on optical injection (Edge Emitting Semiconductor Lasers, EESLs) single cycle oscillation to obtain the photonic microwave scheme is extra attention. With the scheme generated by the microwave signal with frequency tunable, single sideband spectrum has the advantages of the structure, but the linewidth of the microwave signal is wide, should be introduced into the narrow frequency stabilization technology. Compared with the traditional EESLs, the vertical cavity surface emitting laser (Vertical-Cavity Surface-Emitting Lasers, VCSELs) has the advantages of small volume, low threshold, easy and fiber coupling and other advantages, so based on optical injection by VCSELs The microwave signal scheme is more promising. This article based on the nonlinear dynamics of parallel polarized light injected into single cycle state 1550 nm-VCSEL is to obtain the photonic microwave signal, and introduces the characteristics of the experimental study on the microwave signal generated by the optoelectronic negative feedback effect. The research results show that by adjusting the injection strength and light the injection light frequency, 1550nm-VCSEL can exhibit injection locking in parallel polarized light injection (SIL), single cycle (P1), double period (P2), chaos (CO) dynamic state variety; for a given frequency detuning, 1550 nm-VCSEL in large power range can be injected in a single cycle oscillation. In the suitable injection light intensity, parallel polarized light with 1550 nm-VCSEL can produce a spectrum with single sideband structure, photonic microwave signal frequency is higher than 10 GHz, but because of the inherent position of laser. Phase noise, leading to the width of the microwave signal to the order of tens of MHz, affecting the signal long distance transmission in a communication system; further introducing the optoelectronic negative feedback were narrow linewidth of microwave signal, at the appropriate photoelectric feedback intensity, the microwave signal line width from feedback MHz level decreased to more than 100 kHz (reduced by more than two orders of magnitude), and the signal-to-noise ratio is 40.7dB, which is due to the locking effect of microwave optoelectronic feedback signal delay repeated in the loop on single periodic oscillation; in addition, the fixed feedback intensity and its system parameters, only change the injection light power injection can be obtained continuously narrow linewidth tunable microwave signal in a certain range of frequency.

【学位授予单位】：西南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248;TN929.1

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