Receive-side circuit for a system for optically transmitting a d

Details Receive-side circuit for a system for optically transmitting a d Receive-side circuit for a system for optically transmitting a d

1993-10-28

1995-07-25

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359173, 375292, H04B 1006, H04B 1012

Patent

active

054367522

ABSTRACT:
If a digital signal is transmitted over a dispersive optical waveguide (3) with an optical transmitter (2) whose output signal is frequency-modulated (here: FSK-modulated) by the digital signal, the two wave trains which occur in FSK modulation arrive at the end of the fiber-optic link at different times (propagation time difference .DELTA..tau.). The electric output signal V of an optical-to-electrical transducer (5) at the receive side is intensity-modulated and passes through three ranges of values. To recover the digital signal therefrom, use is made of a novel circuit (6) whose output assumes a first state when a sample value is in the first range of values, a second state when a sample value is in the second range, and the same state as N bits earlier when a sample value is in the third range.

REFERENCES:
patent: 4504975 (1985-03-01), Jarret
patent: 4581731 (1986-04-01), Tomikashi
patent: 4665531 (1987-05-01), Aly
patent: 5357378 (1994-10-01), Urakawa

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