前置光放大器实验研究：1994年10月27日收到

报道了在１４０Ｍｂ／ｓ光通信端机上采用国产１．３μｍ低噪声半导体光放大器作为前景光放大器的研究结果。理论分析和实验表明，必须采用窄带光学滤波器滤除光放大器自发辐射引起的各种噪声。     

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。     

带宽〉40nm的980nmLD泵浦掺Er^3＋光纤放大器模块

在国内首次用９８０ｎｍ激光二极管和参量优化Ｅｒ３＋／Ａｌ３＋共掺杂光纤研制成光学带宽＞４０ｎｍ的光电一体化光纤放大器实用型模块样机。模块净增益２５ｄＢ，饱和输出功率０ｄＢｍ，最大输出功率８ｄＢｍ，噪声系数＜５ｄＢ，可供波分复用光纤通信系统和光孤子传输实验试用。     

23mW 33dB光纤放大器模块的研究

报道了高功率掺饵光纤放大器模块的研制。它采用低掺杂Ｅｒ／Ｇｅ／Ａｌ光纤作为放大媒介并采用１．４８μｍ以向激光泵浦结构，模块小信号增益３３ｄＢ，最小噪声系数５．１ｄＢ最大输出功率２３ｍＷ。     

质子交换LiNbO3光波导偏振器的研究

采用平板漏波导模型，对质子交换ＬｉＮｂＯ３波导中的寻常光传输损耗特性进行了理论分析。在此基础上，首次研制了１．５μｍ质子交换ＬｉＮｂＯ３光波导偏振器，其消光比和带尾纤插入损耗分别为４２ｄＢ和４．３ｄＢ。     

新型两段光纤双向泵浦掺铒光纤放大器

运用工程化掺铒光纤放大器模拟理论方法，基于国产１４８０ｎｍＬＤ泵源和国产Ｅｒ＾３＋／Ａｌ＾３＋共掺杂光纤，从理论和实验上分析比较了新型两段级联泵浦与普通单段双泵两种结构ＥＤＦＡ的增益、功率和限幅特性。两段级联ＥＤＦＡ比单段ＥＤＦＡ的增益、３ｄＢ饱和输出功率和动态范围分别提高了５ｄＢ、１ｄＢ和１２ｄＢ，泵浦光转换效率改善了２０％。     

双层减反射膜镀制半导体放大器

首次采用ＺｎＳｅ和ＭｇＦ２双层减反射膜镀制半导体放大器，分别测出了两端面的剩余反射比曲线。结果表明，该放大器两端面反射比剩积最小值低于１×１０＾－６，Ｏ‘Ｍａｈｏｎｅｙ给出的判据，其可用行波单程增益为２２ｄＢ。     

4×155Mb／s频分复用（FDM）光纤通信系统的研究

报道了一个无故障工作时间大于２４小时的四路１５５Ｍｂ／ｓ频分复用（ＦＤＭ）光纤通信系统，实测系统误码率优于０×１０（－１４）。系统接收机包括解复用光滤波器，接收机灵敏度优于－３０ｄＢｍ（ＢＥＲ＝１×１０（－９），频道间距为０．１ｎｍ，四路ＦＤＭ信号－２０ｄＢ的总谱宽为０．７ｎｍ。系统采用国产ＤＦＢ激光器为光源，实际光纤传输距离１８ｋｍ。系统全部实现了脱离光学平台的模块化结构，在长期的系统实验中显示了优良的稳定性。这一成果为ＦＤＭ在光纤传输接入网中的进一步实用化开发铺平了道路。     

2.5GHz非归零码光脉冲的波长变换实验

报道了采用国产器件进行了中心波长为１．５５μｍ，重复频率为２．５ＧＨｚ的非归零码光脉冲基于半导体放大器的交叉增益调制的波长变换实验，波长变换距离２．７ｎｍ。     

使用光纤放大器的频分复用光纤传输系统

报道了一个使用光纤放大器的两路非相干频分复用光纤传输实验系统。系统采用国产ＤＦＢ激光器作光源，用意大利生产的光纤放大器作在线放大器，用自制的光学谐振腔作光学滤波器和解复用器，采用ＦＳＫ调制制式，将１４０Ｍｂ／ｓ非归零伪随机码传输了５０公里，得到了很好的眼图。在频道间距为１０ＧＨｚ情况下，未观测到邻道干扰和光纤放大器的非线性现象。     

Determination of optical constants and inhomogeneity of optical films by two-step film envelope method

A simple two-step film envelope method has been proposed to determine the optical constants and small inhomogeneity of the optical films, which uses maximum envelopes and minimum envelope of the normal incidence transmittance of the two-step film. The two-step films were prepared by stopping the deposition process in the middle of the designed sputtering time, and then, after a full cooling down to room temperature, repeating the same deposition process again to complete the whole preparation of the films. The optical constants of Nb₂O₅-TiO₂ mixed films were calculated by two-step film envelope method and traditional envelope method. The experimental results demonstrate that the average refractive index and extinction coefficient calculated by two-step film envelope method are more accurate than those calculated by the traditional envelope method.     

可擦写相变与4×只读双功能光存储

对国际新推出的可擦写相变与4×只读双功能光存储系统PD进行了技术性论述分析，内容包括：直接重写相变光盘介质、PD的新型光学头技术以及双功能驱动的机理。     

140Mbit／s半导体激光放大传输实验

报导了利用行波半导体激光放大器进行的１４０Ｍｂｉｔ／ｓ传输实验，对光放大器增益－电流、增益－输入功率以及输出－输入功率特性进行了测试，并分析了光滤波器对传输性能的影响。     

光互联网中新型双向可调OXC的设计

本文提出一种新型双向可调2×2的OXC结构,采用可调光纤布喇格光栅和环行器构成。由2×2基本结构能方便地扩充到N×N的B-OXC。此结构具有插入损耗较小、结构简单、体积小、价格便宜等优点,在未来的全光网络中具有广泛的应用前景。     

Preparation and characterization of sol-gel silica based neutral optical density coatings by the addition of graphite particles

Silica based coatings with various thicknesses (600-3000 nm) were prepared from the gellation of aqueous suspensions composed of colloidal silica particles, small graphite particles and inorganic binder materials, the latter were included to improve the coating structure. The graphite particles added in amounts of 0.8-3.6 wt.%, in the dried coating, absorb visible light with the same efficiency, which results in coatings with neutral optical density in this range of the spectrum. The optical density of the coatings can be changed from basically 0, in coatings without graphite, to more than 2 in thick coatings with 3.6 wt.% of graphite. The structural characterization of the coatings was carried out using X-ray diffraction, Raman scattering and atomic force microscopy.     

自由空间的微闪耀光栅光开关

微光学元件在现代光学中具有重要的作用,通过制作8台阶的微闪耀光栅列阵,控制周期参数,利用其在空间的闪耀输出与级连,可以实现2×2、4×4以及8×8的光开关功能,光信号交换透明,无光电-电光转换过程。对微闪耀光栅输出信号的串扰分析表明,微闪耀光栅光开关可以有效的抑制串扰问题,在全光网络通信中具有一定的应用。     

Facile synthesis and optical band gap calculation of Mn3O4 nanoparticles

Mn₃O₄ nanoparticles were prepared by a simple solid state decomposition method. Four manganese benzoic acid complexes were synthesized through semi-solid phase reaction method as precursors for the preparation of Mn₃O₄ nanoparticles. The calcination temperature of the precursors was determined from thermal gravimetrical analyses (TGA). The resulting nanoparticles were characterized by XRD, SEM, STM and HRTEM. The obtained particle size is in the range 39–90 nm. HRTEM indicated the formation of spherical nanoparticles. The optical absorption measurements for the obtained nanoparticles showed that the fundamental absorption edge obeys Tauc's relation for the allowed direct transition. It was found that, the optical band gap (E_g) increases with the decrease of the particle size of the Mn₃O₄ nanoparticles.     

JC—1型精密测角仪光学系统设计

本文重点介绍JC-1型精密测角仪的动态光电自准直定位平行光管光学系统,为了满足测角仪对多谱线高精度测量的要求,应采用的结构形式及象差校正方案。     

具有双极性的非相干OCDMA系统性能分析

提出了一种可减少多址干扰的非相干OCDMA编解码方案，该方案利用光开关控制2个单极性编码器和1个具有平衡互补结构的解码器，在1个光学信道上实现了双极性OCDMA信号传输；分析了电光编码、传输、解码、光电转换等环节的信号变化，推导出系统的噪声和误码率公式；与其它CDMA方案比较表明本方案在误码率方面可达到电域双极性CDMA系统的水平。     

Measurement of the refractive index and thickness of a transparent film from the shift of the interference pattern due to the sample rotation

A method is described for the simultaneous measurement of the refractive index and thickness of a transparent film. The method is based on the rotational shift of the interference pattern caused by the change of the light incidence angle. The refractive index is evaluated without any prior information about film thickness or about the substrate and its refractive index. In addition, the roughness of the interfaces and/or the presence of an unidentified thin layer are not important. In two experimental examples, the refractive index and thickness are measured for a GaN thin film and a cling-film.