可调谐光纤F-P线性滤波器的设计与分析

光纤滤波器在光纤通信和光纤传感领域发挥着重要的作用。本文基于光学薄膜干涉理论设计了一种用于光纤传感的可调谐F-P线性滤波器,该滤波器由两端面相对的入射光纤与出射光纤构成,两光纤端端面分别镀有反射光纤薄膜。该F-P干涉腔改善了传统F-P腔的透射率响应特性,有助于提高滤波器的线性度和线性范围。本文采用光学薄膜干涉矩阵分析法对该滤波器的透射率响应关系进行了计算与分析,并得出该FP滤波器的结构参数。设计结果表明,这种新型线性滤波器具有线性度好、线性范围宽和线性区间可调的优点。     

薄膜干涉型光学全通滤波器的设计与分析

设计并分析了用于多信道色谱补偿的薄膜Gires-Tournois干涉仪（GTI）型光学全通滤波（OAPF），讨论了反射镜的膜层结构对器件 的群延迟谱和反射谱的影响，。以及大角度入射引起的偏分离现象和幅度畸变现象，给出了单级和多级串拉OAPF的初步设计结果。     

低电压驱动的MEMS F-P可调光学滤波器研究

基于微机电系统（MEMS）技术,研制了一种新颖的光学腔与静电驱动器分离的Fabry-Pérot（F-P）可调谐滤波器。从光学设计、MEMS结构设计、制造工艺与器件测试等开展了F-P可调谐滤波器的研究,成功制备了工作在以1550 nm波长为中心、调谐范围为40 nm和驱动电压低于30 V的MEMS F-P可调滤波器。测试...     

Design and experimental study of compensation fitting on the angle-tuned filters

For a 100 GHz DWDM angle-tuned filter with low polarization dependent loss, the insertion loss and the Gaussian- transformation tendency of the transmission spectrum will become more serious as the incident angle is increased. It is because of that the optical path and the transmission modes of the thin film filter will change when the incident angle is varied. According to the thin film matrix theory, the analysis model is established, the displacement change of the transmis- sion field is simulated, and a dynamic compensation fitting is also designed and fabricated in the paper. The experimental results show that it can effectively reduce the insertion loss and the phenomenon of Gaussian process. Using the compen- sation fitting, the tunable range of the filter is at about 20 nm which coincides with the theoretical design.     

新型光通信薄膜器件

综述了用于城域网的x-skip-0滤光片、可调谐滤光片已及无源光网络的波分复用器,并给出了8-skip-0滤光片和无源光网络波分复用器的第一块滤光片的设计光谱图。     

Tunable notch filter using a thermooptic long-period grating

This paper proposes a tunable notch filter using a thermooptic long-period grating and investigates it theoretically. This notch filter is in the form of an integrated optical device and is based on a simple structure as compared with existing integrated optical notch filters. The thermooptic grating denotes a thermooptic index perturbation induced by periodic heaters. The attenuation of a resonance band in the transmission spectrum of the proposed notch filter can be controlled by adjusting the electric power applied to the periodic heaters. Employing the heat transfer theory and the coupled-mode theory, the proposed filter is designed and analyzed. The paper also presents analytic expressions for the temperature change due to a heater and the coupling coefficients due to the thermooptic grating. This filter may have potential as a compact dynamically controllable device like a tunable gain flattening filter.     

3.7～4.8 μm中红外带通滤光膜研制

以光学薄膜理论为出发点,系统介绍了3.7～4.8 m带通滤光膜的理论设计与优化、实际生产制备以及成品测试方法。考虑到膜料性能及膜层匹配等问题,分别选用锗和一氧化硅作为高低折射率材料,并以氧化铝作为薄膜基底。确定了滤光膜的基础膜系,并使用Filmaster软件对膜系进行了设计和优化计算。在薄膜蒸镀过程中,根据材料选取合适的镀制工艺。通过温度控制、离子辅助等方法研制出了可靠性与光谱特性皆优的带通滤光膜,并对其光谱特性及膜层质量等进行了测试。根据设计目标修改工艺参数,最终确定可行的工艺流程,从而研制出了符合光学性能设计指标的3.7～4.8 m带通滤光膜。     

角度调谐滤光片的膜系优化设计算法

根据薄膜窄带滤光片在倾斜入射时的特性,通过改进间隔层膜系结构调整其等效折射率,可以设计出具有稳定透射峰值和带宽的角度调谐窄带滤光片.倾斜入射时窄带滤光片透射光的S和P偏振分量的中心波长会随着入射角度的增大出现分离现象,产生较大的偏振相关损耗.分析了偏振分离现象出现的原因和其与滤光片等效折射率的关系,提出了消除偏振分离现象的方法.根据薄膜矩阵理论建立了分析模型并提出了一种该可调滤光片的设计方法,根据开发的程序优化设计并制备了一组用于100 GHz密集波分复用(DWDM)系统的低偏振相关损耗的四腔角度调谐窄带滤光片,实验结果证明其满足设计要求并有接近20 nm的可调范围.     

一种新偏压结构的BST电容梳状滤波器设计

介绍了一种五阶可调抽头式梳状线滤波器,设计采用共面方式接地,使用Ba0.6Sr0.4TiO3 (BST)铁电薄膜平板电容作为可调部件,并分析了平板电容结构的影响.针对梳状电调滤波器需单阶加压和外接大电阻繁琐的情况,提出利用集成在衬底上的大容量BST电容作为隔离电容,将各阶谐振器的偏压线互连来简化加压过程.运用高频电磁仿真软件HFSS进行验证,设计出的滤波器中心频率可调范围为842～960 MHz(14％),3 dB带宽为9％～10％.     

超窄带宽可调光滤波器的研究

为了降低可调光滤波器的带宽,采用双光栅结构和基于微机电系统的反射镜相结合的方法,构建了具有波长连续可调谐的超窄带宽滤波器,并进行了理论分析和实验验证,取得了滤波带宽小于0.4nm的数据。结果表明,双光栅结构的光滤波器具有性能稳定、重复性优良的性能特点,并且很好地满足了带宽需求。这种结构显著降低了可调谐光滤波器的滤波带宽,提高了系统的稳定性。     

Tunable optical filters using compound ring resonators for DWDM

The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a directional coupler. The loop mirror is implemented using a Sagnac configuration to have the same optical path between the signals to be interfered (copropagating and counterpropagating ones). The filter structure allows optical integration for having higher free-spectral ranges. Simple design equations for the filter parameters and the tuning are reported. Measurements on a passive optical fiber tunable filter are presented. There is a good agreement between measurements and theory.     

一种新型的可重构光分插复用器件的设计

设计了一种带四根单模尾纤的光纤准直器,基于这种四光纤准直器及介质薄膜滤波器,提出了一种新型的可重构光分插复用器件的设计方案.该器件只用一个四光纤准直器,输入光纤、输出光纤和分下/插入光纤都分布在器件的同侧,具有体积小、成本低、信道隔离度高等优点.     

角度调谐滤光片光斑整形设计与实验

在测试制备的100 GHz密集波分复用(DWDM)低偏振相关损耗的角度调谐滤光片时,其透射光谱的插入损耗和带宽的展宽现象会随着入射角度的加大而迅速增加,与理论设计不符.通过多光束干涉原理建立模型模拟,发现在倾斜入射时滤光片的透射光束的光斑会出现展宽和形变,使得位于接收端处的光准直器接收不到足够的透射光束,导致了光谱变形.根据分析结果设计了一种利用直角棱镜的光斑整形方案,能将展宽的椭圆光斑压缩回近似的圆形光斑.制备了一组直角棱镜整形装置,实验证明该设计能够在保持接收端光准直器位置固定的情况下有效地减小透射波形的损耗和半宽展宽现象,使角度调谐滤光片能达到理论设计中20 D_m的可调谐范围.     

基于半导体-金属相变材料的宽谱、偏振选择的红外光开关

提出了一种基于半导体-金属相变材料和掩埋金属光栅结构的新型红外光开关。该结果由电磁场有限元方法计算得到。设计了在近红外波段表现出宽谱的、偏振选择的全光开关效应。掩埋金属光栅极大的提高了二氧化钒薄膜作为光开关的消光比,使得该结构在亚波长尺寸获得了高的消光比。结构的光学响应随入射角变化并不敏感。结构的透过、吸收特性可由结构参数进行调节。此设计在红外光通信、光计算以及军事探测、无损检测等领域具有潜在的应用。     

Flexibly tunable microwave photonic FIR filter incorporating wavelength spacing programmable, arrayed micro-mirror based optical filter

A novel tunable microwave photonic FIR filter incorporating a wavelength spacing tunable multiwavelength filter based on a programmable arrayed micro-mirror device (AMMD) is demonstrated. Owing to the unique characteristic of the AMMD, that an arbitrary optical filter shape can be produced by defining a desired spatial pattern on an array of /spl sim/800 000 micro-mirrors, a wavelength spacing tunable multiwavelength optical filtering pattern is readily obtainable. By controlling the optical filter wavelength spacing, flexible resonance RF frequency tuning is achieved over a range of 2.3 GHz.     

光学滤波片薄膜镀制工艺中的监控技术模拟分析

在窄带滤波器件的研制过程中，模拟分析了采用极值法对膜层厚度进行光学监控及其偏差对滤波器件光学特性的影响，并给出了一个4腔DWDM滤波片的理想工艺曲线以及模拟计算所得到光学特性的分布曲线，计算结果有利于指导高品质薄膜器件的研制，并研制出符合工业应用标准要求3腔和4腔的100GHz,200GHz的DWDM滤波片以及CWDM滤波片。     

Optimal Design of Thin Film Filters for IR Integrated Photonic Amplifiers

This paper addresses in the design of thin film filter for IR broadband integrated photonic amplifiers. A cascaded multilayer medium thin film filter structure is presented. This proposed filter consists of some different filtering unit cells with different central wavelength and bandwidth, and each cell can suppress certain peak gain at a specific wavelength. The intrinsical gain spectrum of amplifier is obtained by solving a set of rate and power propagation equations with finite difference time-domain(FDTD)-based overlapping integral-Runge Kutter(RK) method. The effect of transmittance spectrum of the proposed cascaded multilayer medium thin film filter on flattening gain is discussed. The transmission function of the cascaded multilayer medium thin film filter is obtained. Finally, a real device is fabricated, it is shown that the design is valid.     

一种基于TFF的50GHz平顶型可调谐光滤波器

文章介绍了一种基于薄膜滤光片(TFF)技术的50 GHz通道间隔、平顶型可调谐光滤波器(TOF)的研制.对角度调谐干涉滤光片的原理进行了讨论,同时对超窄带膜系设计进行了优化.研制出的器件样品经过全面测试,实现了40 nm波长范围内96个ITU-T通道的可选择下路,为智能化的光网络提供了一种低成本、高性能的动态波长选择方案.     

A study on the improved performances of OLED using CMP process parameters determined by DOE method

In order to study the chemical-mechanical polishing (CMP) characteristics of indium-tin oxide (ITO) thin film with a sufficient removal amount and a good planarity, the optimal CMP process conditions were determined by using a design of experiment (DOE) approach. The electrical and optical properties, such as current-voltage (I-V) curve and photoluminescence spectrum, were discussed in order to evaluate the possibility of the CMP application for an organic light emitting diode (OLED) device using an ITO film. The electrical I-V characteristics and optical properties of ITO thin film were improved after the CMP process using optimized process conditions compared to that of as-deposited thin film before the CMP process.     

Star-coupler-based optical cross-connect switch experiments withtunable receivers

An optical cross-connect switch using the star-coupler-based frequency-division-multiplex technique are discussed. Two specific tunable receivers have been implanted. The first is a heterodyne receiver with a tunable laser as the local oscillator (LO) and the second is a tunable filter followed by a direct-detection receiver. In the heterodyne receiver, the tunable LO was a monolithic three-section multiple-quantum-well distributed Bragg laser capable of a 1000-GHz tuning range. Receiver sensitivity was measured to be -38 dBm at 1 Gb/s (BER=10^-10). The power margin in the system substantiated feasibility for a 400×400 switch. In the tunable-filter receiver, the tunable filter is a tunable two-stage optical fiber Fabry-Perot filter design consisting of a narrowband filter followed by a wideband filter. The tuning of the filters is computer controlled, and the combined filter has a tuning range of 15000 GHz with a finesse of ≈5170. Therefore, it is capable of covering over 1000 channels of 2.9 GHz each