Optical FDM system

Details Optical FDM system Optical FDM system

1984-06-21

1986-07-15

Orsino, Jr., Joseph A.

Multiplex communications

Wide area network

Packet switching

350358, 455617, H04B 900

Patent

active

046010270

ABSTRACT:
In an optical fiber FDM system, the carriers are derived from the output of a high quality Master Oscillator, which output at frequency f.sub.0 is applied to a Raman Nath modulator (RNM1) whose other input is a frequency f.sub.0 this gives as its outputs (assuming a five channel system) f.sub.0 -2f, f.sub.0 -f, f.sub.0, f.sub.0 +f and f.sub.0 +2f. These are modulated by modulators (CM1, to CM5) with the signals to be sent, and the modulation results combined in a combiner CB for transmission to a remote station. The oscillator output is also sent to the remote stations where it is frequency-shifted by a Bragg modulator (BM) and the resultant similarly dealt with by a Raman Nath device (RNM2) to give five frequencies which are used to demodulate the channels. In an alternative the channel frequencies are switchable.

REFERENCES:
patent: 3845294 (1974-10-01), Indig et al.
patent: 4140783 (1979-03-01), Desbois et al.
patent: 4468766 (1984-08-01), Spezio
patent: 4530084 (1985-07-01), Strebel et al.
Griese--"Conference Systems"--Jour. of the Audio Eng. Soc., Jun. 1979, vol. 27, #6, pp. 503-506.
Huber et al.--"Wideband F-M System"--Applied Optics, vol. 18, #8, Apr. 15, 1979, pp. 1249-1252.

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