G - Physics – 02 – B
Patent
G - Physics
02
B
325/1
G02B 6/28 (2006.01) H04J 99/00 (2009.01) H04B 10/12 (2006.01) H04J 14/02 (2006.01)
Patent
CA 1279373
ABSTRACT OF THE DISCLOSURE At the transmitting end of an optical transmission system, a wide linewidth LED (31) is intensity modulated by a first digital information signal and a narrow linewidth DFB (Distributed Feedback) laser (32) is frequency modulated by a second digital information signal and the two modulated optical signals are combined (33) for transmission over a single mode optical fiber (34). At the receiving end, the intensity modulating digital signal is recovered from the received optical signal by a photodetector (52). The frequency modulating digital signal is recovered by a coherent receiver (53) which includes a local oscillator (55) the output of which is optically combined (54) with the received optical signal. A photodetector (56) converts this combined optical signal to an electrical IF signal, and an IF demodulator (57) reconstructs the second ditital signal therefrom.
570749
Bell Communications Research Inc.
Cassan Maclean
Kazovsky Leonid G.
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