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

9312256韦纳这个项目的目的是证明一种新的，高速通信网络的基础上编码和解码的相干超短光脉冲的物理可行性。 在这种超短脉冲码分多址（CDMA）环境中，多个用户通过一个共同的光纤通信介质连接在一起;多址是通过向不同的用户对分配不同的、干扰最小的代码序列来实现的。 光CDMA的一个独特属性是使用光处理，它克服了电子瓶颈，并直接在光域中实现某些网络操作，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CDMA提供了一个新的范例，利用太赫兹潜在的带宽的光纤，这是没有充分利用其他光网络的方法，并可以导致高速率的局域网和城域网，降低控制要求，如超级计算机互连和多媒体网络的应用。 本研究的目的是在实验测试的超短脉冲CDMA系统和所需的设备，以实现这样一个系统。 相干超短脉冲的编码和解码先前通过频域光脉冲整形技术在可见光波长下进行了演示;执行这种编码和解码的能力是所提出的CDMA网络的关键动机。 然而，到目前为止，还没有在与光纤技术兼容的红外波长下测试超短脉冲CDMA的实验。 目前的提案旨在组装一个简单的超短脉冲CDMA测试平台，包括1.5 μ m的光纤传输，以严格测试该技术的物理层性能。 同时，还将对几种超短脉冲分量技术进行研究，如超快光纤激光器、集成编解码器件、光纤色散补偿技术和非线性光学器件，这将导致更紧凑和实用的超短脉冲CDMA网络的实现。 ***

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. ***