Control system for mirror in optical signal multiplexer - has fast response control mode and slower, more accurate control mode

摘要

The controller controls a motor (13) which alters the position of a plane mirror (8) between the lens system (4), which operates on the output of a modulated laser (1), and a series of lenses (5) which focus the deflected beam onto the ends of fibre optic signal channels (7). The mirror position controller for the multiplexer has a first control strategy based on an open loop system. The first system is used to achieve a fast response to a channel change instruction. The second strategy uses a closed loop servo system for accuracy. The controller has means of switching between the two systems. @(10pp Dwg.No:1/4)@.