1.48μm泵浦EDFA的研制及其在模拟光纤传输系统中的应用

利用国产１．４８μｍ泵浦ＬＤ和优质掺饵光纤研制了一种实用化的掺饵光纤放大器，小信号净增益２８ｄＢ，噪声系数５．１ｄＢ，增益谱宽大于２０ｎｍ，最大输出功率达４．８ｄＢｍ和１１ｄＢｍ。实验研究了ＥＤＦＡ在ＦＭ／ＦＤＭ模拟电视光纤系统的应用，利用ＥＤＦＡ作为系统的功率提升和中继放大器，分别成功地进行了１８５ｋｍ和２２４ｋｍ的系统传输试验。     

采用反向泵浦光纤喇曼放大器的40信道DWDM光纤传输系统放大特性的数值分析

研究了反向泵浦光纤喇曼放大器中泵浦和信号相互作用的数值求解方法。通过这种方法，能方便地获得信号沿光纤的分布，以及多波长DWDM光纤传输系统谱特性等性能指标。对采用反向泵浦光纤喇曼放大器的单信道以及40信道DWDM光纤传输系统进行了分析和计算，给出了模拟计算结果。此方法没有忽略泵浦由于放大信号而引起的损耗，因此结果准确，为反向泵浦光纤喇曼放大器的设计，分析和应用提供了有效手段。     

4×622Mb／s密集波分复用282Km无再生中继光纤传输实验

介绍了８６３计划光电子主题光电子器件试验床（Ｔｅｓｔｂｅｄ）的概况及其最新的实验结果。采用４只国产ＤＦＢ激光器组件为光源、３台国内研制的掺铒光纤放大器作级联放大，实现了在１５５０ｎｍ波段、４路６２２Ｍｂ／ｓ信道、相邻信道波长间隙为２ｎｍ的２８２Ｋｍ单模光纤无再生中继传输，系统误码率优于１×１０－１２。实验表明，随着我国高性能的量子阱半导体激光器和掺铒光纤放大器的研制成功，进行下一代光纤通信技术的研究，包括开展具有多级掺铒光纤放大器放大的高速大容量波分复用光纤通信系统的研制和开发已有了坚实的基础。     

10频道“波分复用＋光纤放大器”全光通信实验系统

在国内首次研制了使用１个光纤放大器的１０频道１０２ｋｍ无再生中继“ＷＤＭ＋ＥＤＦＡ”全光光纤传输实验系统。每频道传输码率为１４０Ｍｂ／ｓ或２８０Ｍｂ／ｓＮＲＺ。所用光纤放大器为增益平坦型，小信号增益为３５ｄＢ。系统全部采用国产ＤＦＢ激光器，各频道波长分别为１５３１、１５３５、１５３７、１５４５、１５４７、１５４９、１５５１、１５５９、１５６１ｎｍ，在波长为１５５１ｎｍ的频道内布置了２路频分复用（ＦＤＭ）系统。波长分布遍及整个光纤放大器的通带。经无再生中继传输１０２ｋｍ后，在误码率为１×１０￣（－９）条件下，实测了尚有数ｄＢ以上（最大为１２ｄ８）的功率裕量。系统使用光栅合、分波器作为波分复用和解复用器，频道间隔为２ｎｍ及其整数倍，系统具有１８个频道的能力。     

抑制等信道间距陆上干线光纤通信系统中光纤色散和四波混频效应的新方案

提出了一种用以克服等信道间距划分、波分复用（ＷＤＭ）＋掺饵光纤放大器（ＥＤＦＡ）陆上光纤通信系统中光纤色散和四波混频（ＦＷＭ）效应的新方案。采用１５５０ｎｍ处色散为－２．８９ｐｓ／ｋｍ／ｎｍ的小色散单模光纤（ｓｍａｌｌ－ｄｉｓｐｅｒｓｉｏｎｓｉｎｇｌｅ－ｍｏｄｅ－ｆｉｂｅｒ，ＳＤＳＭＦ）可避免严重的ＦＷＭ效应，同时利用ＩＴＵ－ＴＧ．６５２非色散位移光纤（ｎｏｎ－ｄｉｓｐｅｒｓｉｏｎ－ｓｈｉｆｔｅｄｆｉｂｅｒ，ＮＤＳＦ），在ＥＤＦＡ整个带宽范围内（１５３０～１５７０ｎｍ）补偿ＳＤＳＭＦ引入的负色散。采用此方案，一个１０路×１０Ｇｂ／ｓ、１０级ＥＤＦＡ级联的等信道间距（１ｎｍ）光纤通信系统，经近千公里的光纤传输后，ＦＷＭ和色散引入的恶化量将分别小于１ｄＢ。     

实用型1.47μmLD泵浦掺Er~3+光纤放大器模块

在国内首次采用国产１．４７μｍ激光二极管和掺Ｅｒ３＋／Ａｌ３＋光纤研制成光电一体化的光纤放大器实用型模块样机。模块净增益２７ｄＢ，饱和输出功率０ｄＢｍ，最大输出功率７ｄＢｍ，光学带宽＞２０ｎｍ，噪声系数＜７ｄＢ，可供光纤通信和光孤子传输实验系统试用。     

紫外光纤的激光传输特性测试

为适应紫外激光传输需要，试制了高透过紫外石英光纤，设计了实验装置，并测量了该种光纤的紫外传输损耗、弯曲损耗、激光损伤阈值和非线性光学效应，并与普通商用石英光纤作比较。分析并获得了紫外光纤的激光传输特性。     

掺Pr^3＋硫（卤）系玻璃1.3μm光纤放大器

介绍了稀土掺杂光纤放大器的发展，总结了用于１．３μｍ光纤放大器的几种重要的硫系统质玻璃，阐述了接Ｐｒ＾３＋硫（卤）系玻璃１．３μｍ光纤放大器的光学性质并分析了－ＯＨ等杂质对其性能的影响。     

30km 2.5GHz光孤子波传输与压缩实验研究

通过实验研究了光孤子源的产生及光纤孤子的传输。采用增益开关分布反馈半导体激光器作为超短脉冲源，用１．４８μｍ激光泵浦的掺饵光纤放大器作为第一级功放，用Ｆ－Ｐ腔谱窗降啁啾技术产生变换限制脉冲，用另一只１．４８μｍ激光泵浦掺饵光纤放大器作为第二级功放，得到了重复频率为２．５ＧＨｚ的高功率变换限制光孤子脉冲；进行了３０ｋｍ光孤子传输实验，观察了光孤子的传输特性与高阶孤子的压缩特性。     

97.8km3信道波分复用双向放大光纤传输系统

在国内首次实现了使用双向掺饵光纤放大器传输９７．８ｋｍ的３信道双向波分复用传输系统，并认述了双向通信系统的特点及其实用化前景。     

Patterning of multilayer dielectric optical coatings for multispectral CCDs

The development of optical sensors for spacecraft applications requires that all components be as lightweight as possible. One method to reduce the weight of a multispectral optical system is to eliminate beamsplitting optics and multiple detectors by patterning a filter array directly onto a CCD. However, techniques commonly used in the production of these filter arrays result in decreased image resolutions. This can greatly impact the performance of sensors used for applications such as planetary probes. To address this issue, we have studied the patterning of multilayer dielectric optical coatings in a small scale, two dimensional array, which will allow development of a four color sensor with a resolution one-half that of monochromatic sensors (compared to one-fourth or less for a four color striped array). We have developed ion milling techniques for the preparation of optical filter arrays which are patterned on a scale as small as 7.5 μm, enabling each pixel of a CCD to have its own associated filter. This paper presents details of the fabrication of these multispectral arrays, and discusses problems associated with pixel-sized filters.     

Near-infrared thermal lens spectrometer based on an erbium-doped fiber amplifier and an acousto-optic tunable filter, and its application in the determination of nucleotides

A novel spectrometer that is based on the use of the thermal lens effect for sensitive measurements of absorption in the near-IR region has been developed. In this instrument the near-IR excitation light (from 1515 to 1590 nm) was provided by an erbium-doped fiber amplifier (EDFA). An acousto-optic tunable filter (AOTF) was used to spectrally disperse the light from the EDFA. The AOTF was used in a new configuration in which, instead of the diffracted light, the transmitted light was used. The heat generated as a consequence of the absorption of the near-IR excitation beam by the sample was monitored by a He-Ne laser. The sensitivity of this spectrometer was found to be at least two to three times higher than that of conventional transmission measurements. Its application in the sensitive determination of nucleotides (adenosine, cytidine, guanosine, and thymidine) is described.     

调顶技术及其在波分复用光纤通信系统中的应用

给出了调顶技术对光纤通信系统误码特性影响的简单理论估计和实测结果：调顶深度小于５％时,调顶对系统接收机灵敏度的影响小于０．５ｄＢ。将专门研制的实用化调顶盘和解调顶盘用于实际的８信道ＷＤＭ光纤通信系统中,能准确判断各信道的有无及其光功率的相对变化,并据此实现了ＥＤＦＡ的增益箝制。     

基于有源光纤环路的光缓存单元

设计了一个低噪声的EDFA,结合0.8nm的窄带光滤波器,采用长为10439m的标准单模光纤,构成了一个有源光纤环路.对其输出特性进行了详细的测试,测试结果表明该系统具有良好的信号复制能力.基于此设计了一个光缓存单元,描述了其存储原理,定义了其单位缓存时间和最大缓存时间,实验表明该光缓存单元实现了光脉冲信号的缓存,单位缓存时间约为50 μs,复制光脉冲个数在500个以上,相应的最大缓存时间约为25 ms.     

航空发动机数据检测与控制信号的光纤传输

本文阐述一个可用于航空发动机数据检测和控制的光纤传输系统。其中包括信号的调制电路、电光变换、光检测器、均衡放大器和滤波器等。分析了光纤传输系统与计算机、传感器和执行机构之间的连接方法以及主要环节的电路结构。最后给出模拟实验和在航空发动机上的试车结果。     

空间光学薄膜技术

随着空间技术的快速发展,光学薄膜技术在我国空间技术中的应用越来越显著,应用领域也越来越广泛。本文概述了目前光学薄膜技术在我国空间技术领域的应用情况以及未来可能的应用领域。鉴于空间环境的特殊性,光学薄膜技术在空间的应用具有特殊的要求,总结了空间环境对于光学薄膜的特殊要求。最后,介绍了表面工程技术重点实验室近年来研究的各类空间用光学薄膜,包括红外滤光片、闪电探测用超窄带滤光片以及线性渐变滤光片等的研究情况及研究结果。     

a-Si:H film on side-polished fiber as optical polarizer and narrow-band filter

An optical waveguide structure consisting of side-polished single-mode fiber covered with thin a-Si:H planar waveguide is studied as a channel-dropping narrow-band filter and fiber-optic polarizer. Spectral and polarization characteristics of the structure are measured in the wavelength region of 600–1600 nm, for the different values of the a-Si:H film thickness and the superstrate refractive index. The FWHM of the filter is about 8 nm for the asymmetric waveguide and 10 nm for the symmetric one. The discrimination of the resonance minima for two polarizations varies from several tens for the symmetric PWG up to several hundreds of nanometers for the asymmetric PWG. The optical losses in the off-resonance region are less than 0.3 dB. The measured value of the extinction coefficient of the fiber-optical polarizer is 32.5 dB.     

基于晶体双折射的光学FIR滤波器设计

提出建立在晶体双折射基础上，由晶体延迟片堆组成的光学FIR（Finite Impulse Response)滤波器设计方法，用以实现任意形状光谱输出。从FIR信号理论出发，建立了光学FIR滤波器数学模型，并分析了它与FIR滤波器的映射关系。在给出“输出反向传递法”来完成其光学实现同时，还以G／M滤波器设计实例证明其优良的光谱特性及角度特性。     

Optically computing the hit-miss transform for an automated cervical smear screening system

The hit-miss transform serves as a region-of-interest locator for cells from cervical smear images that show abnormal changes, which are indicative of malignancy, in their nuclei. An optical implementation of the hit-miss transform algorithm uses an analog spatial light modulator for gray-scale modulation at the filter plane of a 4f optical correlator. Gray-scale modulation at the filter plane improves correlator performance in comparison with a binary phase-only filter (BPOF) by reduction of the edge enhancement of kernels used in morphological detection of cancerous cervical cells. The hit-miss transform with a gray-scale amplitude and binary phase optical filter (GABPOF) for the hit filter and a BPOF for the miss filter shows a 47% reduction in total error versus the use of only BPOF filters to locate abnormal cells.     

扫描振镜幅频特性测试及位置标定的研究

介绍了扫描振镜及其驱动电路的结构特点,分析了位置信号在扫描振镜系统中的作用。利用数据采集系统对扫描振镜的幅频特性进行了测试,借助图像采集系统和图像处理方法对扫描振镜的位置进行了标定,验证了振镜系统中位置信号与振镜的偏转角的线性关系。