GOALI: Polarization Mode Dispersion Compensation in the Spectral Domain Using Liquid Crystal Modulator Arrays

GOALI：使用液晶调制器阵列进行谱域偏振模式色散补偿

• 批准号: 0140682
• 负责人: Andrew Weiner
• 金额: $ 25.5万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-01 至 2006-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0140682&HistoricalAwards=false
• 关键词: GOALI; Polarization; Mode; Dispersion; Compensation

High-speed fiber optics plays a key enabling role in today's information technology revolution by providing a means for high bandwidth communications. Commercial optical transmission bandwidths are increasing at an impressive rate. In light of these advances, new effects which were previously considered insignificant are now viewed as key limiting factors in high performance lightwave systems. In order to sustain the growth in bandwidth, new technologies are needed to compensate new transmission impairments that arise with rapidly growing data rates. One such impairment, which has become a key factor limiting transmission rates and distances in high-speed fiber systems, is an effect called polarization-mode dispersion (PMD). PMD arises due to small, spatially varying random birefringences in optical fibers, which lead to decorrelation of the input and output polarization states and pulse spreading in the time domain. The latter effect can cause errors in digital communication systems. This problem is especially acute in the embedded fiber base where many fibers exhibit strong PMD. This proposal describes a university-industry collaborative project which aims to demonstrate a novel and advantageous method for compensation of PMD. The concept is to exploit and extend technology developed in the field of ultrafast optical pulse shaping to compensate PMD of wide-band optical signals in parallel on a wavelength-by-wavelength basis and under computer control. This improves on current approaches that only allow compensation of so-called first order PMD for a single wavelength and which do not apply to situations with wide-band optical signals where the distortion caused by PMD varies substantially across the optical bandwidth.This research project will encompass several aspects. One goal is to perform experiments demonstrating the validity of the proposed new PMD compensation scheme. Research will also target programmable generation of PMD for use in test equipment. Both of these activities will be backed up by numerical simulations. Additionally, new PMD measurement strategies will be devised in order to provide the data necessary to suitably control the proposed wavelength-by-wavelength PMD compensators. This should also result in a major advance in instrumentation for state-of-polarization sensing applicable to multiple-wavelength systems.

高速光纤通过提供高带宽通信手段，在当今的信息技术革命中发挥着关键的推动作用。 商业光传输带宽正在以惊人的速度增长。鉴于这些进步，以前被认为微不足道的新效应现在被视为高性能光波系统的关键限制因素。 为了维持带宽的增长，需要新技术来补偿因数据速率快速增长而出现的新的传输损伤。 其中一种损害是偏振模色散（PMD）效应，它已成为限制高速光纤系统传输速率和距离的关键因素。 PMD 是由于光纤中微小的、空间变化的随机双折射而产生的，这会导致输入和输出偏振态的去相关以及时域中的脉冲扩展。 后一种效应可能会导致数字通信系统出现错误。这个问题在许多光纤表现出强 PMD 的嵌入式光纤基底中尤其严重。 该提案描述了一个大学-工业合作项目，旨在展示一种新颖且有利的 PMD 补偿方法。 该概念是利用和扩展超快光脉冲整形领域开发的技术，在计算机控制下逐个波长并行补偿宽带光信号的 PMD。这对当前的方法进行了改进，目前的方法仅允许对单个波长进行所谓的一阶 PMD 补偿，并且不适用于宽带光信号的情况，其中 PMD 引起的失真在整个光带宽上变化很大。该研究项目将涵盖几个方面。 目标之一是进行实验，证明所提出的新 PMD 补偿方案的有效性。 研究还将针对用于测试设备的可编程 PMD 生成。 这两项活动都将得到数值模拟的支持。 此外，还将设计新的 PMD 测量策略，以便提供适当控制所提出的逐波长 PMD 补偿器所需的数据。 这也将导致适用于多波长系统的偏振状态传感仪器的重大进步。