高密度光波分复用传输系统信道串扰与信道间隔和信道带宽的关系

通过数学分析，定量地描述了高密度光波分复用传输系统的信道串扰与信道间隔及其信道带宽的关系，从理论上计算出了单模光纤低损耗窗口在各种情况下最多能复用的信道数。简单介绍了光波分复用器的性能指标及适应于不同光波分复用传输系统中的光波分复用器     

基于偏振光干涉仪的Interleaver解复用器实验研究

为实现更窄信道间隔的密集波分复用 ,提出了一种基于偏振光干涉仪的新型Interleaver解复用器 ,分析了结构组成与基本工作原理 ,对其进行了初步的测试实验 ,该器件所分开的DWDM系统两组波长功率均衡 ,隔离度分别为 1 0 6dB和 1 4 6 4dB ,- 1dB带宽分别为 0 7nm和 0 4nm。     

声光调谐滤波器用于多信道光学插分复用器的串音分析

声表面波声光调谐滤波器具有调谐范围宽、调谐速度快以及多个信道同时选择的特性，是实现全光网中光学插分复用器的有效途径之一。为了适应小间隔的密集波分复用系统，我们研究了声光调谐滤波器在单信道选择时的带宽、边带特性，以及多信道工作时信道间的串音与信道间隔、带宽等因素的关系。     

光数字波分复用器

介绍基于光波干涉原理的波分复用器,这类波长复用器可以把复用光波分解为按奇、偶数排列的两组光波,每组光波的波长间隔为原复用光波的二倍。重点介绍光纤和晶体材料的光数字波分复用器的工作原理结构。     

光通信中的波分复用／解复用器技术

波分复用是实现大容量光通信的关键技术,实现DWDM的技术方法多种多样,论述了几种常用的技术原理,分析了各种技术的利弊,现有的每种技术都不是完全理想的。着重讨论了能利用现有波分复用器实现更窄通道间隔的光间插技术（Optical Interleaver),并提出用光纤F－P谐振腔制作Optical Interleaver。     

光数字波分复用器

介绍基于光波干涉原理的波分复用器，这类波长复用器可以把复用光波分解为按奇、偶数排列的两组光波，每组光波的波长间隔为原复用光波的二倍。重点介绍光纤和晶体材料的光数字波分复用器的工作原理结构。     

激光器线宽及F-P滤波器带宽对密集波分复用系统串扰的影响

研究了Ｆ－Ｐ型解复用器在密集波分复用系统中引入的信道间串扰对系统的影响。理论上分别建立了Ｆ－Ｐ的信道串扰模型和接收机的误码率模型，并与实验结果进行了比较。在此基础上讨论了密集波分复用系统中Ｆ－Ｐ型解复用器带宽的参数优化。     

基于Interleave和微谐振环的32信道波分复用器特性

对结合interleave滤波器的1×32信道垂直耦合双环谐振波分复用器件的传输特性进行了研究,得到了器件的光学传递函数公式,对器件的参数、光谱响应、分波光谱、插入损耗以及信道间的串扰进行了数值模拟和优化.分析结果表明,通过在微环谐振波分复用器件的前端增加interleave滤波器,使信道间的串扰降低了14 dB,并且改善了器件的输出光谱形状,提高了器件的信道复用密度;同时,由于采用了在同一基片上集成,保证了器件的低插入损耗.通过参数优化,得到了中心波长为1 550 nm、波长间隔为0.4 nm、3 dB带宽为0.21 nm、插入损耗低于1.1 dB和串扰低于-32 dB的32信道密集波分复用器(DWDM).     

四信道波分复用器／解复用器

GigabitOptics公司研制的MicroMux型疏集波分复用器 /解复用器 ( 9mm× 9.2mm× 6mm)适用于光通信网络子系统中的线卡集成。该装置能组合或分离 4个信道的传输信号 ,适用于城域核心网、城域接入网和企业疏集波分复用系统 ;多波长 30 0针脉冲转发机、GBIC和Xenpak无线电收发机。该装置符合国际电信联盟ITU G694 2规定。主要性能为 :标准信道间隔 2 0nm、波长范围 1 45 0～ 1 630nm、插损≤ 2dB、回程损耗≥ 45dB、偏振依赖损耗≤ 0 .1 5dB。 (No .1 6)四信道波分复用器/解复用器…     

级联非平衡Mach—Zehnder干涉仪型复用器特性分析

本文分析了非平衡马赫－曾德干涉仪的特性,设计和讨论了多级级联非平衡马赫－曾德干涉仪型密集波分复用／解复用器,对其光谱特性、信道谱宽和隔离度进行了模拟分析,结果表明利用光纤光栅来提高信道隔离度的结构可以满足系统需要。这种结构复用／解复用器可用于至少16路或32路的密集波分复用系统中。     

Polarization independent narrow channel wavelength divisionmultiplexing fiber couplers for 1.55 μm

A polarization-independent narrow-channel (PINC) wavelength division multiplexing (WDM) coupler for operation at 1.55 μm has been designed based on the birefringent properties of fused single-mode couplers. These couplers are made from both conventional single-mode fiber (SMF) and dispersion shifted fiber (DSF). The couplers are designed so that the coupling-coefficient-length products for the two orthogonal polarizations are π out of phase. As a result of the long coupling lengths required, these couplers have very small cross-sectional dimensions, typically on the order of 10 μm     

Development of miniature optical fiber hybrid WDM coupler employing the FBT technology

An innovative technique for fabricating the optical fiber hybrid wavelength-division multiplexing (WDM) coupler is presented. The device is comprised of two components, a wavelength division multiplexer and an optical fiber coupler, in a miniature stainless steel tube. The outstanding features of the ultra-low polarization dependent loss (PDL) under 0.05 dB and the compact size of ∅3.5 × 65 mm for bare-fiber type of package are accomplished by using the pioneering methodology combining the main techniques of twisted and parallel fusion processes in the fused biconical taper (FBT) technology. Besides, its miniaturization is more competitive in both of the applications of optical communication and sensing systems where a compact-sized package is required for extending the flexibility of installation.     

Guidelines for design and fabrication of fused fiber coupler based wavelength division multiplexings

The fused fiber coupler can be function as WDM (Wavelength Division Multiplexing). An analysis of the wavelength response of the fused fiber coupler is presented here. Both theoretical and numerical methods are used to calculate the wavelength channel spacing of WDM at different pulling stop cycles. Experiments were carried out to testify the calculation results. A combination of theoretical and numerical method is used to predict the channel spacing of WDM. The calculation agrees well with the experimental results. This paper provides some guidelines for design and fabrication of the fused fiber based WDMs.     

Large wavelength shifts in UV-exposed 3 dB and WDM fused taperfibre couplers

The spectral response of 3 dB and 1300/1550 nm wavelength division multiplexing fused taper fibre couplers can be shifted by over 100 nm by exposing the entire coupler with intense UV light at a wavelength of 193 nm and without prior hydrogenation. There is no discernable increase in excess loss. The major contribution to these shifts for these couplers originates in the down- and up-taper regions     

Four-port fibre-optic ring resonator

A novel device is described, formed by taking one of the outputs of a 3×3 fused optical coupler back to one of the inputs to form a fibre optic ring resonator with two inputs and two outputs. The device can be used for narrowband wavelength division multiplexing and for switching of optical signals     

Experimental optimization of an erbium-doped super-fluorescent fiber source for fiber optic gyroscopes

Double-pass forward and double-pass backward erbium-doped super-fluorescent fiber sources(EDSFSs) were combined in one configuration.A 980 nm laser diode pumped the same erbium-doped fiber from both directions using a coupler as a power splitter.The double-pass configuration was achieved by coating the fiber end face.Firstly,an optimal fiber length was found to obtain a high stability of output light wavelength with pump power, and then 1530/1550 nm wavelength division multiplexing was used for spectrum planarization,which expanded the bandwidth to more than 22 nm.The final step was a test of temperature stability.The results show that the rate of the central wavelength change kept to below 3.5 ppm/℃in the range of -40 to 60℃and 1-2 ppm/℃in the range of 20-30℃.Considering all the three factors of the fiber optic gyro applications,we selected 80 mA as the pump current,in which case the central wavelength temperature instability was calculated as 2.70 ppm/℃, 3 dB bandwidth 22.85 nm,spectral flatness 0.2 dB,output power 5.17 mW and power efficiency up to 9.92%.This experimental result has a significant reference value to the selection of devices and proper design of ED-SFSs for the application of high-precision fiber optic gyroscopes.     

Analysis of lapped fiber couplers with an intermediate layer

The effect of a matching or sealing layer inserted in the coupling region of a lapped fiber coupler is analyzed. It is found that the first-order correction factor to the coupling coefficient is proportional to the optical path increment but is independent from bending radius and fiber separation. Specific data with reference to wavelength division multiplexing couplers are presented     

全光纤DWDM器件的研制

介绍了在密集波分复用系统中使用的一种全光纤波分复用解复用器件的原理,分析了第二个耦合器耦合比对信道隔离度的影响,给出了制作全光纤密集波分复用解复用器件的实验数据。     

Numerical study of passive gain equalization with twin-core fibercoupler amplifiers for WDM systems

This paper presents a numerical study of twin-core fiber coupler amplifiers for equalization of wavelength division multiplexing (WDM) channels. The propagation of WDM pulses within a coupler and a chain of couplers is analyzed. The real spectrum gain of the device is considered along with dispersion and nonlinear effects. The influence of intermodal dispersion is studied. A model is developed based on a set of linearly coupled nonlinear Schrodinger equations