High-Speed Communicatins Networking Using Spectrally EncodedUltrashort Light Pulses: Technology and Systems Studies

9312256韦纳该项目旨在论证一种基于相干超短光脉冲编码和解码的新型高速通信网络的物理可行性。在这种超短脉冲码分多址(CDMA)环境中，多个用户通过公共光纤通信介质连接在一起；多址是通过将不同的、干扰最小的代码序列分配给不同的用户对来实现的。光码分多址的一个独特属性是使用光处理，它克服了电子瓶颈，并在光域中直接实现了某些网络操作，例如寻址、路由和安全，这些操作传统上是以电子方式执行的。超短脉冲码分多址为开发光纤的太赫兹潜在带宽提供了一种新的范例，这是其他光联网方法没有充分利用的，并且可以导致用于诸如超级计算机互连和多媒体联网等应用的具有更低控制要求的高速率局域网和城域网络。这项研究旨在对超短脉冲码分多址系统以及实现该系统所需的设备进行实验测试。相干超短脉冲的编码和解码以前是通过频域光脉冲整形技术在可见波长下演示的；执行这种编码和解码的能力是所提出的码分多址网络的关键动机。然而，到目前为止，还没有进行过测试与光纤技术兼容的红外波长的超短脉冲码分多址的实验。目前的方案旨在组装一个简单的超短脉冲码分多址实验台，包括1.5um的光纤传输，以便关键地测试该技术的物理层性能。还将对超快光纤激光器、集成编解码器件、光纤色散补偿技术和非线性光学器件等几种超短脉冲组件技术进行研究，使超短脉冲码分多址网络的实现更加紧凑和实用。***

9312256 Weiner This project aims at demonstrating the physical feasibility of a novel, high-speed communications network based on encoding and decoding of coherent ultrashort light pulses. In this ultrashort pulse code-division multiple-access (CDMA) environment, a multiplicity of users are connected together via a common fiber optic communications medium; multiple-access is achieved by assigning different, minimally interfering code sequences to different subscriber pairs. A unique attribute of optical CDMA is the use of optical processing, which overcomes electronics bottlenecks and implements directly in the optical domain certain network operations, such as addressing, routing, and security, which traditionally have been performed electronically. Ultrashort pulse CDMA offers a new paradigm for exploiting the terahertz potential bandwidth of optical fibers, which is not fully utilized by other optical networking approaches, and can lead to high-rate local- and metropolitan-area networks with reduced control requirements, for applications such as supercomputer interconnects and multimedia networking. This research aims at experimental tests of an ultrashort pulse CDMA system and of the devices needed to implement such a system. Encoding and decoding of coherent ultrashort pulses were previously demonstrated at visible wavelengths by means of a frequency-domain optical pulse shaping technique; the ability to perform such encoding and decoding is a key motivation for the proposed CDMA network. To date, however, no experiments testing ultrashort pulse CDMA at the infrared wavelengths compatible with fiber optic technology have yet been conducted. The current proposal aims at assembling a simple ultrashort pulse CDMA testbed, including fiber transmission at 1.5um, in order to critically test the physical layer performance of this technique. Research will also be performed on several ultrashort pulse component technologies, such as ultrafast fiber lasers, integrated encoding and decodin g devices, fiber dispersions compensation techniques, and nonlinear optical devices, which will lead to more compact and practical implementations of ultrashort pulse CDMA networks. ***