Optical double transmission system

Details Optical double transmission system Optical double transmission system

1996-03-15

1998-05-12

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359115, H04B 1012

Patent

active

057514585

ABSTRACT:
Disclosed is an optical double transmission system for transmitting a digital optical signal output from an optical transmitter through an optical fiber cable to an optical receiver, wherein: the optical transmitter transmits the digital optical signal multiplex-light-intensity-modulated by a main data signal and a sub-data signal with a clock rate lower than that of the main data signal; and the optical receiver has a photoelectric conversion circuit for converting the digital optical signal into a first electric signal which can include a DC component, a low-pass filter for passing a frequency component lower than that of the main data signal of the first electric signal, an offset cancel circuit for controlling a value of the DC component of the first electric signal to be such that a DC component in the output of the low-pass filter is made zero responding to the output of the low-pass filter, and a sub-data signal reproducing circuit for reproducing the sub-data signal from the output of the offset cancel circuit.

REFERENCES:
patent: 5291326 (1994-03-01), Heidemann
patent: 5390185 (1995-02-01), Hooijmans et al.
patent: 5510919 (1996-04-01), Wedding

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