METHOD AND SYSTEM FOR PREVENTING LOW ORDER OPTICAL TRANSMISSION MODES IN A MULTIMODE OPTICAL FIBER COMPUTER NETWORK USING AN ANNULUS LASER,申请号CA19992324569-传众专利搜索

METHOD AND SYSTEM FOR PREVENTING LOW ORDER OPTICAL TRANSMISSION MODES IN A MULTIMODE OPTICAL FIBER COMPUTER NETWORK USING AN ANNULUS LASER

申请公布号：CA2324569(C)

申请号：CA19992324569

申请日期：1999.05.21

申请公布日期：2003.02.04

申请人：

CABLETRON SYSTEMS, INC.

发明人：SCHOFIELD, BRUCE A.;SIMCOE, ROBERT;KIRK, RICHARD L.;HUTCHISON, JERRY D.

分类号：G02B6/42;H01S5/028;H01S5/183;(IPC1-7):H01S3/085

主分类号：G02B6/42

摘要：A method for improving modal bandwidth in computer networks using multimode optical fiber and laser sources is disclosed in which an annular beam is generated by the laser source, thus preventing center fiber transmission mod es from reaching the detector. This prevents or lessens a pulse-splitting effec t at the detector. The annular beam is generated by configuring a vertical cavity surface emitting laser to have a center totally-reflecting block of 5 -7 microns to generate a substantially dark-centered beam.