以白光麦克尔逊干涉仪对双折射保偏光纤的偏振耦合进行测试，并基于仪器结构建立了测试扫描结果的数学模型，分析及仿真了信噪比对耦合强度及耦合位置检测的影响大小及变化趋势。信噪比大于32Db，可满足偏振耦合测试的要求。

This paper descrities the dual layer scalable optical interconnentcion nitwork being developed at Tianjin University. The layer of the network is a multiwavelength bidirectional optical bus. Which has large bandwidth and low latency, The bus is made up of passive components. No wavelength-tunable devices are used As a result, the bus ponents. No wavelength-tunable devices are used As a result, the bus has a low communication latency that is mainly determined by the optical fiber length. The optical fiber length. The sublayer of the network is a single-wavelength ring, which has low communication latency and high scalability. In each ring. a wavelength routing node is designed for data transmission between the ring and the optical bus. Each node computer is connected to the ring throuth an optical network interface card. The communication latency inside the ring is decreased by using synchronous pipelining transmission.

A broadband optical rotary joint (BORJ) was designed using Clenses. Its insertion loss was less than 2dB at both the 1300nm and 1550nm wavelength windows. Wavelength division multiplexing (WDM) technique was adopted to increase the number of data transmission channels. Hundreds of wavelength channels can be accommodated for data transmission through relatively rotating interfaces using this BORJ. The total data transmission rate through this BORJ can be more than 200Gbit/s. By using Dove prism, both space division multiplexing (SDM) and WDM techniques can be implemented simultaneously in the design of BORJ with C-lenses. This structure of BORJ has a low cost. It can be used for optical data transmission and optical sensing.

In this paper, a novel method to measyre the distributed polarization mode coupling in poladzation-maintaining (PM) fibers is introduced. The measuement system is based on white light interference. A super luminescent diode is used as the broadband light source in the system, The whole test system is working on 130Ohm wavelength. There are two main palls of the measurement equipment: poladzation adjustment and a scanned Micbelson interferometer. In order to improve the accuracy, a piezoelectric transducer (PZT) is applied in the scanned Micbelson interferometer. The maximum length of tested polafizadon-maintnining fiber is one kilometer, and the spatial resolution of this method reacbed 60mm along the tested PM fiber, The degree of polarization mode coupling that could be detected is-75dB.

A novel structure has been designed for bit synchronization in a terabit-per-second optical interconnection network with adjustable op tical delay lines, The two-stage network consists of 1024 optical links connected to a central switching module. A distributed optical clock net-work is designed for bit synchronization at each node computer. Zero link setup time can be achieved by precisely matching the phases of each pair of clock and signal, The link-to-link switching time can be reduced to less than 20 ns in the two-stage network. Even in a three-stage network that can accommodate 32.768 optical links, the link switching time can be maintained below 30ns. At the same time, a total bidirectional band-width of 98304Tbit/s can be obtained. Since bit synchronization is achieved entirely in the optical domain, this structure is independent of link transmission rates.