Single transmission line bidirectional optical communication sys

Details Single transmission line bidirectional optical communication sys Single transmission line bidirectional optical communication sys

1987-02-09

1989-04-25

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

455606, 455612, H04B 900

Patent

active

048251135

ABSTRACT:
A single transmission line bidirectional optical communication system comprising a directional coupler employing a polarizing beam splitter, an optical transmitting circuit for coding the data and converting the coded data into optical signals and outputting said signals, an optical receiving circuit employing a comparator having a function of automatically establishing a threshold for converting optical input signals into electrical signals and then decoding the data, a circuit for detecting the frequency differences between the sending signals and receiving signals, and a line diagnosing circuit.
The polarizing beam splitter eliminates a near-end reflected beam, and the optical receiving circuit having a function of automatically establishing a threshold eliminates a remote-end reflected beam. The line diagnosing circuit diagnoses the line condition by comparing the sending frequency and receiving frequency.

REFERENCES:
patent: 4025194 (1977-05-01), Teppo
patent: 4709414 (1987-11-01), So et al.

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