高斯光束经衍射光栅的滤波特性研究

为了分析高斯光束经衍射光栅后的衍射特性,采用标量衍射理论推导出单色高斯光束的夫琅禾费衍射公式,在此基础上采用高斯光束耦合理论研究了复色高斯光束在衍射光栅的分光作用下的滤波特性,并与平行平面光束通过衍射光栅的分光特性进行了比较。结果表明,单色高斯光束在能量分布上与因子T相关,并且复色光束的滤波带宽会收窄。这为设计和优化高性能光滤波器提供了理论参考。     

用于CO2探测的高功率1572nm可调谐光源

为了研发一种应用于CO2探测激光雷达的全光纤宽带可调谐高功率光源,以CO2的超精确吸收谱为基础,结合外腔可调谐激光器和L波段光纤放大器,进行了理论分析和实验验证,取得了针对1572nm附近吸收峰的连续调谐窄线宽光源的数据,并通过铒镱双包层光纤放大器将输出光功率提升到瓦级以上。结果表明,光源输出功率大于10dBm,边模抑制比大于50dB,线宽500kHz左右,1572nm放大器最大增益可达25.13dB,输出光功率达到1W以上。该光源具有体积小、低功耗和低成本的优势,对实现更大范围的空间CO2浓度探测分析有一定的帮助。     

超长距通信技术在电力系统中的应用

分析了限制超长距无中继传输通信的关键性因素,主要包括功率因素、色散因素和光信噪比因素等,并逐一对克服这些限制因素的相关技术进行了介绍,主要包括掺铒光纤放大器、色散补偿、前向纠错（FEC）和非线性抑制等技术,然后结合实际产品在电力系统中的应用进行了详细说明,最后总结出了超长距无中继传输通信系统设计的基本原则。     

A planar waveguide optical discrete Fourier transformer design for 160 Gb/s all-optical OFDM systems

A cost-effective all-optical discrete Fourier transformer (ODFT) is designed based on a silicon planar lightwave circuit (PLC), which can be applied to all-optical orthogonal frequency division multiplexing (OFDM) transmission systems and can be achieved by current techniques. It consists of 2 × 2 directional couplers, phase shifters and optical delay lines. Metal-film heaters are used as phase shifters, according to the thermooptic effect of SiO₂. Based on the ODFT, a 160 Gb/s OFDM system is set up. Simulation results show excellent bit error rate (BER) and optical signal-to-noise ratio (OSNR) performances after 400 km transmission.     

DFB LD manufactured by nanoimprint lithography

Gratings of distributed feedback laser diodes (DFB LDs) have been successfully manufactured by nanoimprint lithography (NIL). Uniform gratings with periods of about 240 nm and phase-shifted in the center have been fabricated by a soft press NIL employing a polymer stamp technology. Moreover, the shape of the grating is rectangle, rather than sinusoidal by holography.The test results show good characteristics of the electrical and spectral output. The results of this study indicate that NIL has high potential for the manufacture of DFB LDs.     

用于相干光通信的可调谐激光器的研究

针对相干光通信系统对窄线宽可调谐激光器的要求,提出并实际研制了一种基于MEMS(微电子机械系统)技术的外腔可调谐激光器,分析了外腔参数对激光器性能的影响。该激光器尺寸符合光互联论坛关于ITLA(集成可调谐激光器组件)的标准01.2,调谐范围覆盖C波段内40nm,输出功率N13dBm,光谱线宽N100kHz。为进一步验证器件的性能,使用该激光器作为本振光源,验证了它在基于PM-DQPSK(偏振复用-四相相移键控)的100Gbit/s传输系统中的性能,实验结果表明,该激光器可作为高速相干光通信系统中窄线宽可调谐光源的理想选择。     

一种新型MEMS滤波器在EDFA中的应用

文章提出了一种基于微电子机械系统(Micro-Electro-Mechanical Systems,MEMS)的新型可调谐光滤波器(OTF),分析了其基本原理和结构,研究了其光学特性,并制作出了OTF成品.得到的OTF成品体积只有51 mm×16 mm×10 mm,3 dB带宽约为0.3 nm,具有体积小、控制简单和光学性能优良等特点.最后,研究了这种MEMS OTF用于EDFA前置放大器时的特性.     

A modified dual-wavelength matrix calculation method

Fiber grating is an optical passive device which has been greatly developed in recent years.The largest application for fiber Bragg grating (FBG) is the fiber sensor.Cross-sensitivity of fiber grating sensor is the most important problem which has restricted the development of the fiber sensor.In this paper, we explain how the crosssensitivity problem is produced based on the basic principle, and we suggest a modification for the traditional dual-wavelength matrix calculation method, which is used to solve the cross-sensitivity problem.The modified calculation method has a higher accuracy than the traditional one.     

DWDM系统光通道性能在线监控模块

基于密集波分复用(DWDM)的光传送网构成了整个通信网络的基础物理层.为了满足DWDM技术的应用和升级,能够进行在线监测的光通道性能模块成为当前很多光器件公司研究和开发的热点.一个典型的在线光性能监测(OPM)模块能够在线监测通道光功率、中心波长及光信噪比(OSNR)等指标.文章系统地阐述了OPM的应用背景、技术特点、性能指标以及发展前景,并对各厂家生产的OPM模块进行了比较分析.     

一种新型ROADM模块的设计实现

文章介绍了一种具有升级能力和动态增益均衡的低成本可重构光分插复用器(ROADM).该模块由平面阵列波导光栅、光开关集成可调衰减器(SiVOA)、环行器、探测器、耦合器以及隔离器构成.SiVOA的灵活应用实现了波长的双向传输并降低了模块成本.通过调整SiVOA,可以实现任意单波长或多波长的上下路及功率调节.文章给出了模块的基本工作原理及指标测试结果.