Loop-back device for half-duplex optical transmission system

Details Loop-back device for half-duplex optical transmission system Loop-back device for half-duplex optical transmission system

1990-08-28

1991-08-27

Eisenzopf, Reinhard J.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

370 6, 370 15, 370 321, 379410, 359113, 385 15, H04J 300, H04B 1000

Patent

active

050439766

ABSTRACT:
A loop-back device is particularly designed to fit line terminals in half-duplex optical transmission systems thereby facilitating fault location in these transmission systems. An optical fiber coupler having a high crosstalk generates an echo in a reception channel of the terminal, from a test signal transmitted in a transmission channel of the terminal, to an optical transmission medium. Means are provided for cancelling transmission of the echo in the reception channel when the loop-back is de-activated, i.e. when a data signal is carried in the transmission medium, and for amplifying and regenerating said echo when the loop-back is activated, i.e. when said test signal is transmitted. A memory is used for delaying the echo and for transmitting it to a receiving circuit in the terminal during a signal reception period of the half-duplex transmission.

REFERENCES:
patent: 4450555 (1984-05-01), Pays
patent: 4829512 (1989-05-01), Nakai et al.

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