EXCHANGE CHANNEL DEVICE USING LIGHT

摘要

PURPOSE:To improve the noise resistance as well as to simplify a control system, by using the light also to a channel driving system. CONSTITUTION:The voice of a subscriber undergoes modulation of amplitude with a DAM modulator AM at a designated time slot after passing through a subscriber line and a subscriber circuit and is sent to an optical switch network via a light emitter LE. The optical PAM signal given from the emitter LE is transmitted through many optical fibers and then focused and multiplexed through an optical lens 2. This optical signal is converted into an electric signal by a light receiver LR and then divided into (n) directions for each (m) time slots via a time-division type distributor 3. The RAM pulses of the (m) time slots are simultaneously transmitted to (m) pieces of optical fibers by an electricity-light distributor 20. While one of (m) pieces of optical fibers is designated by the demodulating gate designating information DMGINF, and only the output of the designated optical fiber is restored to an audio signal.