基于悬臂梁啁啾调谐的光纤光栅滤波器

提出并发展了一种基于悬臂梁结构的啁啾光纤Bragg光栅(CFBG)啁啾调谐方案,获得了一系列性能优异的可调谐CFBG滤波器,包括调谐范围达到36 nm(1.8～37.8 nm)的带宽可变反射滤波器、色散在178～2 100ps/nm范围内可调的色散补偿器、基于取样CFBG或重叠写入CFBG的信道间隔可调谐滤波器等。这些FBG滤波器不但能维持较高的反射率,还能保持中心波长基本不变。     

基于InP/空气隙分布布拉格反射镜的微机械可调谐光滤波器

采用表面微机械技术制作了一种1 310 nm基于InP/空气隙分布布拉格反射镜的微机械可调谐Fabry-Perot光滤波器.该滤波器的通光孔直径约为70 μm,在1.4 V的调谐电压下,调谐范围达到15 nm.并采用光学传输矩阵方法,分析了斜入射对这种可调谐光滤波器透射谱的峰值半高宽的影响.     

SOI基微环谐振可调谐滤波器

采用电子束光刻和ICP刻蚀等工艺制作出基于SOI纳米线波导微环谐振滤波器。滤波器微环半径为5μm左右,波导截面尺寸为(350nm～500nm)220nm不等。测试结果表明,波导宽度为450nm时器件性能最为理想,其自由频谱宽度为16.8nm,1.55μm波长附近的消光比为22.1dB。通过对微环滤波器进行热光调制,在21.4℃～60℃温度范围内实现了4.8nm波长范围的可调谐滤波特性,热光调谐效率达到0.12nm /℃。同时,研究了基于单环和双环的多通道上下载滤波器,实验结果表明多通道滤波器的信号传输存在串扰,主要是不同信道之间的串扰,尤其在信号上载时,会在相邻信道产生较大串扰。     

具有90nm调谐范围的1.3μm Si基MOEMS可调谐光滤波器

利用表面微机械技术,成功制作了1.3μm Si基MOEMS可调谐光滤波器.原型器件在50V的调谐电压下,调谐范围为90nm.该技术可以用于制作1.3μm Si基可调谐光探测器.     

热光Si共振腔型可调谐滤波器

报道了利用Si基键合技术和化学机械抛光工艺制作的垂直结构的Fabry-Perot可调谐滤波器,调谐机理为pn结正向注入电流引起的热光效应.调谐范围可达23nm,响应时间约为300μs,并给出了获得更快响应和更低能耗的热光和电注入可调谐滤波器件结构改进方案.     

基于F-P腔的MEMS TOF的波长控制技术

文章分析了基于法布里-珀罗(F-P)腔技术的微机电系统(MEMS)可调谐光滤波器(TOF)的调谐原理,推导并测试了其波长与温度及波长与电压的关系,提出了温度与电压相结合的波长混合控制技术,实现了1 530～1 560 nm范围内的波长可调的光滤波器.     

具有90nm调谐范围的1.3μm Si基MOEMS可调谐光滤波器

利用表面微机械技术,成功制作了1.3μm Si基MOEMS可调谐光滤波器.原型器件在5 0 V的调谐电压下,调谐范围为90 nm.该技术可以用于制作1.3μm Si基可调谐光探测器.     

热光Si共振腔型可调谐滤波器

报道了利用Si基键合技术和化学机械抛光工艺制作的垂直结构的Fabry- Perot可调谐滤波器,调谐机理为pn结正向注入电流引起的热光效应.调谐范围可达2 3nm,响应时间约为30 0 μs,并给出了获得更快响应和更低能耗的热光和电注入可调谐滤波器件结构改进方案.     

一种新型可调谐光阈值器件

提出一种基于超连续谱(SC)的新型可调谐非线性光阈值器件,通过调谐光带通滤波器(OTF)改变阈值器件特性。实验中,高非线性光纤(HNLF)输入光功率为21.0dBm时,测得滤波器中心波长一定时的最佳20dB带宽为12~18nm,滤波器带宽固定时的最佳中心波长为1 576nm。     

可编程控制波长调谐的环形掺铒光纤激光器

提出了一种新型的可调谐光纤激光器,器件采用介质薄膜干涉滤波器进行波长可编程调谐,调谐范围超过38 nm(1 526.5～1 564.6 nm),中心波长可精确调谐到C波段指定的ITU-T波长栅格的标准中心波长处,3 dB带宽小于0.08 nm,25 dB带宽小于0.22 nm,波长稳定性优于0.01 nm,边模抑制比大于60 dB,最大输出光功率35.6 mW,功率稳定性优于±0.02 dB,阈值泵浦功率和斜率效率分别为5.8 mW和36.6%.     

一种基于ADS的电调谐滤波器的新设计

设计了一种用于跳频通信系统接收机射频前端的UHF频段电调谐滤波器。使用安捷伦公司的 微波仿真软件ADS对电调谐滤波器进行结构设计和参数优化。对制成品的实际测试表明,该 调谐滤波器工作频段为225～400 MHz,3 dB带宽6.5～15 MHz,通带增益24～27 dB,矩形系 数小于6.2,其性能指标完全达到设计要求,在不同的频点都具有良好的电参数指标。所提 方法对电调滤波器的设计具有指导作用。     

基于Mach-Zehnder滤波的可调谐光纤激光器

() ()基金项目: 。摘要:为了实现高稳定性的可调谐激光输出,提出并设计了一种基于Mach-Zehnder(M-Z)滤波结构,结合Fabry-Perot(F-P)滤波器的可调谐掺铒光纤激光器,并对激光器的原理及实现方案进行理论分析和实验验证。所设计激光器系统的泵浦源工作波长为976 nm;长度5 m的掺铒光纤作为增益介质;采用全光纤M-Z结构进行滤波,并结合F-P滤波器实现单波长激光可调谐输出。实验中,通过调节F-P滤波器,在泵浦功率为60 mW时,实现了1547～1568 nm范围内单波长激光的稳定可调谐输出,波长调谐间隔小于1.7 nm,每个输出波长的边模抑制比均大于55 dB,线宽均小于0.1 nm。     

Digitally tunable wavelength filter and laser

A novel nonmechanical, digitally tunable, polarization insensitive and optically transparent wavelength filter using holograms electro-optically written on a ferroelectric liquid crystal (FLC) spatial light modulator (SLM) has been constructed and operated to tune to discrete wavelengths spaced by 1.3 nm. The filter has been incorporated in a ring laser which is tunable over a range of 38.5 nm across the erbium window, giving output powers of 10 mW. Both wavelength filter and tunable laser are suitable for wavelength division multiplexing (WDM) applications.     

Microwave photonic bandpass filter based on spectrumslicing and phase modulator

A tunable microwave photonic bandpass filter with high mainlobe-to-sidelobe ratio (MSR) based on a phase modulator and a dispersive device is proposed. The multi-tap characteristics of the filter are realized by slicing a broadband source using a Mach-Zehnder interferometer (MZI) which results in a high MSR of 25 dB. The tunability of the filter is realized by an optical variable delay line (OVDL) in one arm of the MZI, which changes the wavelength spacing of the sliced broadband source and results in a tunable free spectrum range (FSR) of the filter. The central frequency of the bandpass filter is tunable from 10.7 GHz to 27 GHz by changing the wavelength spacing from 0.145 nm to 0.054 nm.     

激光二极管阵列的窄线宽、可调谐输出

外腔反馈的激光二极管阵列(LDA)可获得窄线宽、可调谐的光谱输出。外腔由快轴准直镜、准直光学系统和闪耀光栅组成。由于阵列中各发光单元的排列弯曲导致不同波长的光原路返回,引起谱线展宽,在输出光路中加入光谱滤波器,使激光二极管阵列的线宽进一步窄化。这样,激光二极管阵列的输出光谱由自由运转时的2 nm压缩到0.12 nm,在恒定温度23℃时,实现了激光在806～818 nm的调谐,调谐范围达12 nm。     

Fiber Laser Thermally Tunable by a Filter Composed of Two Sagnac Interferometers

Many applications, such as fiber Bragg grating characterization, wavelength division multiplexing, etc. require tunable laser sources with one emission line in a certain wavelength range. Generally, such sources are laser systems combined with tunable filters. In this work an all-fiber laser tunable by a filter composed of two Sagnac interferometers in series is described. The filter loops were constructed of high birefringence fibers (HiBiFi) and the filter was thermally tunable with a single transmission maximum in the Erbium gain spectrum. The results showed that for interferometers with 14 cm HiBiFi length a bandwidth reduction of the transmission peak, a single-line laser emission, a tuning sensitivity of approx. -0.8 nm/degC and a spectral full-width at half-maximum bandwidth of 0.03 nm in the range of 1538-1580 nm were obtained.     

Design and Simulation of a Narrow Passband Electro-Optical Tunable Filter with Band-pass and Band-rejection Output

An electro-optical tunable filter comprised of two paralleled identical long-period waveguide gratings is proposed in this paper. The filter has one input port and two separate output ports, outputting band-pass and band-rejection light respectively. Using poled electro-optical polymer material to fabricate its waveguide cores enable the filter’s tuning speed to approach nanosecond order. With the aid of long-period waveguide gratings, the tuning range of the filter is Λ times larger than the conventional electro-optical filters. We built up a model to design and simulate the proposed tunable optical filter. We investigate the relationship between the parameters of the long-period waveguide grating and the characteristics of the tunable filter, such as tuning range and FWHM. The simulation results show that the tunable optical filter can realize high-speed tuning in the wavelength range of 1530 nm to 1560 nm, and the FWHM width can reach 0.8 nm. Compared with the conventional optical filters, the results show that a high-speed widely tunable optical filter with narrow pass band can be achieved.     

双可调谐掺铒光纤环形腔滤波器的实验研究

提出一种基于全光纤有源环形腔结构的双可调谐窄带滤波器。它能够充分利用腔中掺铒光纤放大器(EDFA)的宽带增益特性 ,有效可调谐滤波范围达到 39nm ,并改善了腔精细度对EDFA增益非平坦度的相关性。通过改变抽运功率 ,可方便地对其精细度进行调谐 ,从而实现全光纤结构滤波器的滤波波长和精细度的双可调谐。     

利用AOTF的可调谐光纤激光器的特性研究

提出了一种新型的可调谐光纤激光器 ,其谐振腔是由声光可调谐波长滤波器 (AOTF)和掺铒光纤构成的Fabry Perot腔。该激光器具有调谐方便 ,调谐速度快和调谐范围大的优点。在忽略激发态吸收和放大的自发辐射情况下 ,对该激光器的线宽和调谐特性以及阈值抽运功率和斜率效率进行了理论计算。在中心工作波长 15 5 0nm处 ,得到输出峰值的半极大值线宽 (FWHM)约为 0 2 6nm ,并且在 15 5 0nm附近 ,声波频率每改变 1MHz所调谐的峰值波长间隔约为 8 95nm。理论上 ,调谐范围只受掺铒光纤增益和滤波器带宽的限制。计算结果表明 ,该激光器的阈值抽运功率和斜率效率分别为 0 795mW和 15 15 %。     

Widely (132 nm) wavelength tunable laser using a semiconductor optical amplifier and an acousto-optic tunable filter

A widely wavelength tunable laser combining a semiconductor optical amplifier, an acousto-optic tunable filter and a Fabry-Perot etalon has been developed. It exhibited good characteristics over a 132 nm (1480-1612 nm) tuning range.