Four level FSK optical signal transmission with optical decoding

Details Four level FSK optical signal transmission with optical decoding Four level FSK optical signal transmission with optical decoding

1990-01-03

1992-03-24

Eisenzopf, Reinhard J.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04B 1000

Patent

active

050993518

ABSTRACT:
Apparatus for optical transmission of first and second digital channels. Each digital channel has first and second signal levels. The apparatus has a tunable laser for emitting an optical output at optical frequencies corresponding to current levels. An input which provides a current responsive to the signal levels of the two channels provides current levels to cause the laser to emit a first optical frequency when the first channel has a first signal level and the second channel has a second signal level, a second optical frequency when the first channel has a first signal level and the second channel has a first signal level, a third optical frequency when the first channel has a second signal level and the second channel has a first signal level, and a fourth optical frequency when the first channel has a second signal level and the second channel has a second signal level. An optical transmission medium is coupled to the output of the laser. A local oscillator provides a LO frequency. An envelope detector is coupled to the local oscillator and the transmission medium detects the optical frequency from the laser and provides an IF heterodyne frequency corresponding to the difference between the first LO frequency and the optical frequency from the laser. A mark is generated if the IF heterodyne frequency results from either the first or second optical frequency. The mark indicates a first signal level on the first channel.

REFERENCES:
patent: 4564946 (1986-01-01), Olsson
patent: 4972515 (1990-11-01), Shibutani

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