The insertion loss of a fiber optcalirotary joiot depends on the mechenical misalgnments of the collimating lenses To achieve 3-dB or less Insertion loss, the lateral nusanment of the graded index (GRIN) lenses should be less than 100μm, and the angular tilt at these lenses is limoted to 0.1 deg These requirements cauee a high mechanical fabrication and assemciy cost. To solve this problem, we design a single-channel optica1 rotary joint using a bulk optical detector The requirement on lateral misalignment is relaxed to 500μm, and the angular tilting is relaxed to 2 deg. Using this method, the cost of Ihe oplical rotary joint can be dramatically reduced

In this paper, we present a low cost fiber-optic data link for the computing cluster. The link is a 32bd-virtual channel fiber-optic computer bus used only a pair of OE devices and fbers The link is integrated with the popular PCI Bus interface in order to make the link hold the same bandwidth as that of the PCI Bus. and it can operate under managed by PCI Bus. Our research addresses how to match accessing bandwidth between computer bus and high-speed optical interconnection, and how to make low overhead and latency interfaces between optics and electronics, and integrates fiber optic link into computing system designs.

In this paper, a new scheme has been proposed to achieve high-performance local area network adoptii/g 5～15nm separdted eosrse wavelength division multiplexing (CWDM) technique. Using this scheme, the current single-wavelength gigabit Ethernet can be sesmlessly upgrdded to multi-wavelength network. Not only can the network bandwidth be broadeneds but also wavelength routing can be achieved among different sub-networks. The dam packet communication latency can be reduced one-to-two magnitudes in comparison with that of the current gigabit Ethernet. To expand the network scale, multi-wavelength-window CWDM teehifique can be adopted. Two kinds of network interface cards have been designed using opto-electronics devieosst the 850nm and 1300nm wavelength windows, respectively. Experiment.s indicate that the two kinds of CWDM signals can be selectively received at the corresponding optical detectors. By introducing two optical droppiing devices in the network, multi-wavelength-window (850nm, 1300nm and 1550nm) CWDM system can be achieved.

基于白光干涉原理，通过麦克尔逊干涉仪的光程补偿作用，检测保偏光纤空间分布寄生偏振耦舍强度和耦合点位置。经数据采样时域理论分析知：扫描步长增大时，耦合强度检测误差和耦合点位置判断误差呈线性增大。扫描步长小于500nm时，强度误差小于5%，位置误差在±11mm之内。

In this paper; we discuss the optical fiber interconnection rech. nologlesappbedinthem, orypes of parallel pmcessing systems 1) u backplane intercotmectian in a parallel processor array system and 2) a computing cluster network We have get up a parallel procesor array system using optical fiber to make point4o-pomt interconnection between procesror elements and are develomng a low cost virtnal parallel optical fiber interonnection hnk (VPOFLblb) complying with pertpberal component interconnect (PCI) local bus specifications for tbe computing cluster VPOFLink is integrated with tbe popular PCI bus interface in order to make the link hold the same bandwidth as that of the PCI bus It was fabricated as an available peripheral device that can been inserted rata the bus xlots of commercial computers directly and can operate under the control of PCI bus Also in this paper, we demonsate the optical fiber link for a ring network and the arcbitecture of the ring network