频谱分割ASE注入波长锁定FP-LD的研究

文章分析了频谱分割放大自发辐射(ASE)注入波长锁定法布里-珀罗激光器(FP-LD)光谱随注入种子光光功率的变化情况.实验研究了ASE频谱分割光源注入波长锁定FP-LD的增益和边模抑制比(SMSR)随注入ASE光功率以及FP-LD注入电流的变化关系.最后比较了经过不同频谱分割方法的注入波长锁定光信号在波分复用-无源光网...     

注入锁定法布里-珀罗激光器的单模工作特性

使用分布式反馈(DFB)激光器对法布里-珀罗(F-P)激光器进行单模注入锁定.通过改变F-P激光器的偏置电流,DFB激光器的输出功率以及两激光器间的波长失谐量,对注入锁定F-P激光器的光谱特性、功率特性以及频率响应特性进行实验分析.找出影响注入锁定F-P激光器稳定性的因素,并测量注入锁定F-P激光器的稳定锁定区;通过优化注人条件实现F-P激光器的高边模抑制比(SMSR)输出,最高可达55 dB;通过与自由运转F-P激光器比较,发现注入锁定可以明显抑制半导体激光器在高频调制下光谱的展宽.注入锁定后F-P激光器的3 dB调制带宽接近14 GHz.实验结果表明,通过合理设计光注入条件,注入锁定技术可以明显改善F-P激光器的光谱特性以及高频响应特性,并在高速光纤通信领域中得到广泛应用.     

掺镱双包层光纤激光器多波长输出性能分析

从理论上分析了由F-P滤波器实现的多波长双包层光纤激光器(DCFL)的边界条件和输出功率,在考虑了F-P滤波器中双色镜反射率的波长依赖关系的前提下,对影响多波长输出功率和消光比的参数如双色镜和光纤出光端面的反射率、抽运功率等进行了研究。结果表明,光纤出光端面的反射率存在一个最佳值,再配合适当的双色镜反射率,能使多波长输出的功率和消光比达到很好的均衡。适当增大抽运功率也能优化多波长输出功率和消光比。通过控制F-P滤波器的腔长,能够调节多波长输出的数目。     

一种新的互注入锁定产生单/双波长光脉冲的方案

本文提出了使用两个F-P半导体激光器互注入锁定来产生单/双波长光脉冲的方法.其中一个FP做增益开关调制,另一个给定直流偏置.通过简单调节一个可调光滤波器,可以输出所需波长,且重复频率保持不变.对于单波长输出,在19nm范围内其边模抑制比超过30dB;对于双波长输出,在12.1nm范围内其边模抑制比超过25dB.该系统具有简单,成本低的优点.     

可调谐双波长低抖动增益开关光脉冲的产生

提出了一种产生可调谐双波长低抖动超短光脉冲的新方法。采用外光注入法来降低增益开关F-P激光脉冲的时间抖动,实现了脉冲光谱的双波长可调谐输出。实验中利用两个多量子阱DFB激光器作为外部种子光源,通过温度控制和偏振态调节使外部种子光有效地耦合到增益开关F-P激光器中,输出的光脉冲时间抖动(均方根)从2.57ps降低至1.06ps,双波长的边模抑制比可达25dB。通过改变DFB激光器和F-P激光器的工作温度,可实现波长从1540nm到1560nm的可调谐输出。     

线性光放大器的宽带自发辐射噪声分析

建立含有垂直光场(VCL)的线性光放大器(LOAs)稳态仿真模型,考虑了宽带噪声特性、端面反射和纵向空间烧孔效应。计算了在不同输入信号功率和垂直腔分布布喇格反射器(DBR)反射率下总的输出ASE噪声功率、噪声系数(NF)、前向和后向传输的ASE噪声光子速率和噪声谱分布的变化。结果表明,与传统光放大器(SOAs)相比,在增益非饱和区,LOA有很好的噪声钳制作用,ASE噪声几乎不随信号功率的改变而变化。在增益饱和区,破坏了VCL的钳制作用,NF有所上升,但上升的速率小于SOA。提高DBR反射率,总的输出ASE噪声功率减小,但NF有所增大。     

外注入锁定对FP激光器强度噪声的抑制

采用较强的外注入光锁定FP激光器,获得了理想的强度噪声抑制效果. 在自由运转的FP激光器的弛豫振荡峰处,最大噪声抑制强度可达9dB. 研究了注入光功率和频率失谐对于强度噪声抑制效果的影响. 此外,通过实验研究了理想噪声抑制范围与激光器稳定锁定范围之间的关系：它们都随着注入光功率的增加而增大;但在相同的注入光功率下,稳定锁定范围允许更大的频率失谐.     

基于莫尔光纤光栅的F-P LD双模自激注入锁定

提出一种基于莫尔光纤光栅的F-P(法布里-珀罗)半导体激光器双波长自激注入锁定生成拍频信号以获得所需毫米波的实验方案。实验结果表明,在11.7nm波长调谐范围内可获得边模抑制比约为30dB的双波长输出,该双波长输出可产生高达168GHz的拍频信号。该高频毫米波信号生成方案的系统结构简单,成本低廉。     

外注入锁定对FP激光器强度噪声的抑制

采用较强的外注入光锁定FP激光器,获得了理想的强度噪声抑制效果.在自由运转的FP激光器的弛豫振荡峰处,最大噪声抑制强度可达9dB.研究了注入光功率和频率失谐对于强度噪声抑制效果的影响.此外,通过实验研究了理想噪声抑制范围与激光器稳定锁定范围之间的关系:它们都随着注入光功率的增加而增大;但在相同的注入光功率下,稳定锁定范围允许更大的频率失谐.     

基于光注入法布里-珀罗激光器的窄带可调谐微波光子滤波器

基于光注入法布里-珀罗(F-P)激光器的波长选择性放大理论,设计并实现了一种窄带可调谐的单通带微波光子滤波器(MPF)。通过改变注入锁定参数,研究了注入锁定参数对中心频率、插入损耗和带外抑制比等性能指标的影响,以及波长功率放大与腔模红移的关系。实验结果表明,通过合理调节注入功率比、主从激光器失谐频率和偏置电流,可以获得带外抑制比为27.9dB、3dB带宽为275 MHz和调谐范围为9~32GHz的MPF。所提结构可以应用于高频、宽带可调谐的滤波选频和光电振荡。     

Noise Characteristics of a Wavelength-Locked Fabry–Perot Laser Diode

We derived a theoretical model of a wavelength-locked Fabry–Perot laser diode (F-P LD) to a sliced spectrum of externally injected amplified spontaneous emission (ASE) from wave equations. The model explains the dynamics of the wavelength-locked F-P LD. Using this model, we investigated the noise characteristics of a wavelength-locked F-P LD with respect to the various parameters, such as, the injected ASE power, the bias current of F-P LD, and the wavelength detuning. We also investigated intensity noise increment by spectral filtering in optical access networks based on wavelength-locked F-P LDs.      

1.25-Gb/s Operation at 50-GHz Channel Spacing Based on Intensity Noise Suppression of Wavelength-Locked Fabry–PÉrot Laser Diode

We demonstrate 1.25-Gb/s operation at 50-GHz channel spacing and 10-km single-mode fiber, which is based on a wavelength-locked Fabry-Perot laser diode (F-P LD) and an intensity noise suppression by a gain saturation of F-P LD in front of the receiver. The wavelength-locked F-P LD employs the spectrum-sliced incoherent light with narrow bandwidth of 35 GHz. The intensity noise of wavelength-locked F-P LD is suppressed about 6 dB by the F-P LD in the front of the receiver. As a result, the bit-error-rate curves exhibit the error-free performances over the detuning conditions to cover a whole mode spacing period of F-P LD.     

Intensity Noise in a Wavelength-Locked Fabry–Perot Laser Diode to a Spectrum Sliced ASE

We derived analytic expression for the relative intensity noise (RIN) of a wavelength-locked Fabry-Perot laser diode (FP LD) in a single mode region. The RIN of the wavelength-locked output is a function of the photon density and the photon life time. It also depends on the wavelength detuning and the injected amplified spontaneous emission (ASE) power. We investigated the modulation transfer function of the wavelength-locked FP LD and its dependence on wavelength detuning. The analytic result has good agreement with the simulation result.     

A Simple and Color-Free WDM-Passive Optical Network Using Spectrum-Sliced Fabry–PÉrot Laser Diodes

We propose and demonstrate a simple and color-free wavelength-division-multiplexing passive optical network (WDM-PON) using spectrum-sliced Fabry-Perot laser diodes (F-P LDs). Due to its low front facet reflectivity (~0.1%), the F-P LD shows a broadband lasing spectrum and reduced mode partition noise. By utilizing multiple peaks that are separated by the free-spectral range of the cyclic arrayed waveguide gratings, the 16-channel WDM-PON is successfully demonstrated at 155 Mb/s.     

A theoretical model of a wavelength-locked Fabry-Pe/spl acute/rot laser diode to the externally injected narrow-band ASE

We propose a theoretical model of the wavelength-locked Fabry-Pe/spl acute/rot laser diode (F-P LD) to the externally injected narrow-band amplified spontaneous emission. The model explains the dynamics of the wavelength-locked F-P LD. The simulation results with the proposed model show good agreement with the experimental results.     

155 Mbit/s transmission using ASE-injected Fabry-Perot laser diode in WDM-PON over 70/spl deg/C temperature range

Thermal reliability of an uncooled Fabry-Perot laser diode (F-PLD) wavelength-locked to spectrum-sliced amplified spontaneous emission (ASE) as a source for wavelength division multiplexed-passive optical networks (WDM-PONs) is presented. An F-PLD with narrow mode spacing and asymmetric facet reflectivity relieved temperature dependency of transmission and power requirement of ASE injection. The chip temperature range of error-free transmission at 155 Mbit/s extended over 70/spl deg/C with -22 dBm ASE injection.     

Broad-band light source using mutually injected Fabry-Pe/spl acute/rot laser diodes for WDM-PON

We propose and demonstrate a new broad-band light source (BLS) for a wavelength division multiplexing-passive optical network (WDM-PON) based on the wavelength locked Fabry-Pe/spl acute/rot laser diodes (F-P LDs). By mutual injection between two antireflection-coated F-P LDs, we realized a broad-band light with a low relative intensity noise. By using the proposed BLS for wavelength locking of the F-P LD, we achieve color-free operation of the optical network termination with Manchester coded data. We also demonstrate a WDM-PON based on the proposed BLS.     

Degradation of side-mode suppression ratio in a DFB laser integrated with a semiconductor optical amplifier

The degradation of the side-mode suppression ratio (SMSR) in a monolithically integrated distributed feedback laser and semiconductor optical amplifier (SOA) cavity is investigated. An expression is derived that gives the degradation of the SMSR in the case of a perfectly antireflection-coated SOA facet. The amplified spontaneous emission (ASE) backcoupling can have dramatic effects and degrade the SMSR of single-mode devices to unacceptable levels.     

TDM-PON上行信号光功率均衡器的锁模特性

为了减小时分复用无源光网络（TDM-PON）上行信号光波长的飘移,基于TDM-PON上行信号光功率均衡器架构,采用单模激光注入锁定光网络单元（ONU）法布里-珀罗（F-P）激光器（LD）方法,研究了F-P LD输出光波长的锁模特性,包括锁模的范围、驱动电流对锁模特性的影响、锁模前后温度变化引起F-P LD光波长变化情况等。结果表明,当驱动电流为9mA时,F-P LD可被锁模的波长范围为0.38nm,大于ONU上行光波长因环境温度变化5℃而产生的波长位移量0.25nm,F-P LD被锁模可使ONU上行信号的光波长相同且稳定,降低光功率均衡后的噪声。