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1、引言在过去几年中,已把几个完整的光纤系统(OFS)放在英国邮政部(BPO)网络中的现场条件下加以评定。工业部门与BPO都主要安装与评价用CVD法制的梯度折射率光纤的
I. INTRODUCTION In the past few years, several complete optical fiber systems (OFS) have been evaluated in field conditions in the UK Postal Service (BPO) network. Both the industrial sector and BPO mainly install and evaluate graded-index optical fibers manufactured by CVD