Optical communications systems
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United States of America Patent
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-
Sep 14, 1993
Grant Date -
N/A
app pub date -
Nov 18, 1991
filing date -
May 25, 1989
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A system for distributing interactive HDTV signals includes a head-end station and a number of customer stations. The head-end station includes at least one optical source. A bidirectional transmissive broadband passive branched optical network distributes HDTV signals from the head-end station to the customer stations. Each customer station includes an optical coupler arranged to couple the subscriber station to a respective arm of the optical network a coherent receiver including a local oscillator laser and a transmitter arranged to modulate light from the local oscillator laser with return data for transmission via the coupler onto the network. The head-end station also includes a broadband optical receiver arranged to receive and demodulate the return data received via the optical network.
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