基于光纤光栅和光学环形器的密集波分复用解复用器的实验研究

提出了一种实用的基于光纤光栅和光学环形器的密集波分复用解复用器，并对其进行了系统的实验研究。实验结果表明，该器件在０．３ｎｍ的通道间隔下，串话小于－１５ｄＢ，适合于密集波分复用。该器件还具有结构简单、通道扩展方便等特点。     

DWDM系统中的Interleaver技术

目前密集波分复用(DWDM)系统已广泛应用于长途干线、城域网．并扩展至接入网。其中波分复用／解复用器是系统的核心器件之一．而50GHz的密集波分复用更要靠一种交叉波分复用(Interleaver)的全新器件．为此详细阐述了Interleaver的原理、主要实现方案及其特点。     

密集波分复用系统中光器件的应用及发展

本文概述了密集波分复用系统中光复用/解复用滤波器、光纤、光放大器、光分/插复用器、光交叉连接器等器件,并对其发展作了简要介绍。     

密集波分复用技术

介绍密集波分复用的基本原理,特点及其使用的光纤,阐述避免四波混频的方法及ＤＷＤＭ使用的耦合分路器件。     

WDM光滤波器及其应用

目前光纤通信正向全光传输网方向发展,密集波分复用(DWDM)技术是全光传输网的基础与关键。它采用虚拟光纤技术,可以较低的成本极大扩展传输信息的容量,不仅提高了传输能力,还有强大、灵活的联网优势,因此成为未来通信传输系统高速扩容的首选方案。DWDM技术也已成为光纤通信技术领域中的核心技术。 在WDM网络中,必须将光纤中以不同波长传输的信号进行复用或解复用,这就需要滤波器。窄带滤波器是波分复用/解复用器和OADM滤波器必不可少的器件。     

DWDM光网络的关键技术和发展趋势

简述了密集波分复用(DWDM)光网络的关键技术(包括光纤和光器件、网络路由等)和发展趋势。     

密集波分复用技术

介绍密集波分复用的基本原理、特点及其使用的光纤,阐述避免四波混频的方法及ＤＷＤＭ使用的耦合分路器件。     

光波分复用器件和光学梳状滤波器理论及最新进展

介绍了波分复用（WDM）/解复用器件和光学梳状滤波器（Interleaver)的几种实现方法，分析了各种方法的特点和现状，并提出了实现更密集WDM的一种新途径——DWDM器件和Interleaver级联方案。     

4×622Mb／s密集波分复用系统280Km光纤传输实验

本文报道４路６２２Ｍｂ／ｓ密集波分复用系统经３级ＥＤＦＡ２８０ｋｍ光纤的传输实验，并对长距离高速密集波分复用系统传输特性进行了分析。     

重叠写入啁啾光纤光栅型滤波器的研究进展

高性能的波分复用器是密集波分复用系统的核心器件之一,重叠写入啁啾光纤光栅型带通滤波器充分发挥了光纤光栅优良的波长选择特点,是一种低成本的新型全光纤波分复用器件.综合评述了各种不同结构的重叠写入啁啾光纤光栅型滤波器的工作原理、基本特点及其应用.     

基于分立衍射光栅的波分复用(解复用)器

波分复用(解复用)器是光通信中重要的无源器件。对目前常用的波分复用(解复用)技术进行了综述,着重介绍了一种新颖的波分复用(解复用)技术,基于分立衍射光栅的波分复用(解复用)技术,并介绍了它所克服的技术难点以及目前它所达到的技术水平。     

利用光纤光栅研制分插复用器

在波分复用的光纤通信系统中,分插复用技术需要低损耗、小型化的、稳定的、可靠的器件。使用光纤光栅,可以 制作多种结构的分插复用器,本文对多种基于光纤光栅的分插复用器的结构和原理进行了研究。     

Integrated-optics planar components

Optical fiber architectures of the future are envisioned to employ extensive splitting of optical signals, as well as multiple wavelength division multiplexing and demultiplexing. These architectures and networks have motivated the development and commercialization of today's planar passive components. Beyond and including these applications, the prospects for new and exciting uses of planar devices are excellent. Planar passive components already are providing such functions in what is known as fiber-in-the-loop (FITL) systems. These applications are discussed     

Dense wavelength-division multiplexing millimeter-wave-band radio-on-fiber signal transmission with photonic downconversion

Photonic downconversion (PDC) technique for dense wavelength division multiplexing (DWDM) millimeter-wave-band radio-on-fiber (ROF) uplink systems is investigated. The PDC technique is carried out for a lump of all uplink wavelength division multiplexing (WDM) ROF signals at a central station. Each channel is optically separated, photodetected, and demodulated individually without serious signal degradation due to the fiber dispersion effect. Error-free 25-GHz-spaced DWDM transmission and demultiplexing of two 60-GHz-band, 155-Mb/s differential phase-shift keying (DPSK) ROF signals over 25-km-long standard single-mode fiber (SMF) are experimentally demonstrated.     

基于偏分复用技术的数字RoF系统研究

为有效缓解D-RoF系统高数字比特速率的不利影响,本文研究了偏振复用的D-RoF系 统,能有效 提高系统单波长的传输容量。分别在传统Stokes矢量检测和简化Stokes矢量检测下,采用一 路偏振态向量 追踪(OTV)与两路偏振态向量追踪(TTV)的DSP算法能够有效实现偏振解复用。仿真结果表明 ,两路偏振 态向量追踪方法能有效降低正交偏振复用D-RoF系统的功率预算,达到系统最终误码率时, TTV算法需要 的光功率要比OTV算法需要的光功率少2dBm。同时,可用TTV方法实现两路信号最小偏振复 用度为76° 的非正交偏振解复用,丰富了偏振复用的维度。该偏振复用D-RoF系统对其在未来5G无线传 输和有线数字电视传输具有重要意义。     

Uni- and bidirectional 4λ×560 Mb/s transmissionsystems using WDM devices based on wavelength-selective fusedsingle-mode fiber couplers

Four-wavelength-channel wavelength-division multiplexing (WDM) lab transmission system experiments with buried heterostructure (BH) lasers at 1200-, 1240-, 1280-, and 1320-nm wavelengths, all-fiber WDM devices, and 20-km single-mode link fiber at a 560-Mb/s bit rate demonstrated that unidirectional and bidirectional WDM transmission systems could be operated successfully by using all-fiber 4λ multiplexing, 4λ demultiplexing, or 4λ multiplexing/demultiplexing devices with a low insertion loss per wavelength channel (2.1-4.7 dB), enough optical far-end crosstalk attenuation (18-37 dB), and high optical near-end crosstalk attenuation (43-49 dB). It is concluded that the four-wavelength-channel WDM lab transmission system at 560 Mb/s mainly used as a test bed is not representative of future unidirectional trunk WDM systems. Such systems favor distributed feedback (DFB) lasers in the 1500-1560-nm wavelength range where fiber attenuation is lower than in the 1200-1320 nm wavelength range and where 1500-nm DFB lasers with a smaller linewidth do not limit the repeater distance as much because of mode partition noise     

Dynamic digital holographic wavelength filtering

This paper describes the theory and results of a new generic technology for use in optical telecommunications and wavelength division multiplexing (WDM): dynamic digital holographic wavelength filtering. The enabling component is a polarization-insensitive ferroelectric liquid crystal (FLC) spatial light modulator (SLM) in conjunction with a highly wavelength-dispersive fixed diffractive element. The technology has been used to perform demultiplexing of single or multiple WDM signals, dynamic erbium doped fiber amplifier (EDFA) gain equalization and channel management, and used to tune an erbium-doped fiber laser (EDFL) functioning as a high power, very narrow linewidth WDM source     

All-optical TDM data demultiplexing at 80 Gb/s with significant timing jitter tolerance using a fiber Bragg grating based rectangular pulse switching technology

We demonstrate the use of fiber Bragg grating based pulse-shaping technology to provide timing jitter tolerant data demultiplexing in an 80 Gb/s all-optical time division multiplexing (OTDM) system. Error-free demultiplexing operation is achieved with /spl sim/6 ps timing jitter tolerance using superstructured fiber Bragg grating based 1.7 ps soliton to 10 ps rectangular pulse conversion at the switching pulse input to a nonlinear optical loop mirror (NOLM) demultiplexer comprising highly nonlinear dispersion shifted fiber (HNLF). A 2-dB power-penalty improvement is obtained compared to demultiplexing without the pulse-shaping grating.     

Optical-to-electrical wavelength demultiplexing detector: design,fabrication, and analysis

An optical-to-electrical wavelength demultiplexing detector has been fabricated using a short length of twin-core optical fiber and an integrated bi-cell detector. The twin-core fiber splits 1325 and 1535 nm input signals onto different output cores, thus directing each demultiplexed channel onto the spatially separated active areas of the bi-cell. We discuss the design, fabrication, and post-tuning techniques used to successfully demonstrate the wavelength demultiplexing functionality of the device and present some preliminary results from an assembled laboratory prototype     

Simultaneous interrogation of fiber Bragg grating sensors using anacoustooptic tunable filter

We describe a novel technique to provide demultiplexing of fiber Bragg grating sensors, interrogated using interferometric wavelength shift detection. Amplitude modulation of multiple radio frequency driving signals allows an acoustooptic tunable filter to provide wavelength demultiplexing. We demonstrated a noise limited strain resolution of 150 nanostrain/√(Hz) and a crosstalk better than -50 dB