Bidirectional optical transmission system having a light-interru

Details Bidirectional optical transmission system having a light-interru Bidirectional optical transmission system having a light-interru

1989-11-08

1991-10-15

Eisenzopf, Reinhard J.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359152, H04J 100, H04B 1000

Patent

active

050581031

ABSTRACT:
Disclosed is a bidirectional optical transmission system for effecting bidirectional optical transmission between offices by utilizing a common optical transmission line. Each office comprising: a light transmitting unit for transmitting a light signal to another office; a light receiving unit for receiving a signal from the other office; and a light passing unit for passing the transmission signal from the light transmitting unit to the optical transmission line and for passing the receiving signal from the optical transmission line to the light receiving unit. To discriminate whether the received signal is the signal from the other office or from the same office by crosstalk through the light passing unit, the light transmitting unit comprises a light-interruption detecting signal superimposing unit for superimposing a light-interruption detecting signal on the transmission signal, the frequencies of the light-interruption detecting signals from the first office and from the other office being different from each other; and the light receiving unit comprises a light-interruption detecting signal detecting unit for detecting the light-interruption detecting signal from the other office by identifying the frequency of the light-interruption detecting signal from the other office.

REFERENCES:
patent: 4101833 (1978-07-01), Bingham et al.
patent: 4393518 (1983-07-01), Briley
patent: 4491984 (1985-01-01), Wiedmer
patent: 4534064 (1955-08-01), Giacometti et al.
patent: 4688268 (1987-08-01), Holland
patent: 4833668 (1989-05-01), Rowley et al.
patent: 4900917 (1990-02-01), Dixon et al.

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