Coherent optical communication system with fsk heterodyne or...

Details Coherent optical communication system with fsk heterodyne or... Coherent optical communication system with fsk heterodyne or...

H - Electricity

04

B

325/1

H04B 10/142 (2006.01) H04B 10/148 (2006.01) H04L 27/14 (2006.01)

Patent

CA 1232325

ABSTRACT OF THE DISCLOSURE A laser (21) is frequency modulated by an electrical modulating signal of a bit rate into a modulated signal of a first and a second modulated frequency. A combination of an optical mixer (27) and an optical detector (31) carries out optical heterodyne or homodyne detection on the modulated optical signal to produce a detected signal having a first and a second frequency component. A component separator (32) is for selecting only one of the components from the detected signal. A detector (33) detects the selected component to produce a demodulated electrical signal representative of the modulating signal. The laser is preferably a semiconductor laser. More preferably, the semiconductor laser is frequency modulated after the modulating signal is converted to a current of an mBnB code sequence, when the bit rate is below and above about 10 Mbit/second, either the modulating signal or the m3nB code sequence current is preferably used in frequency modulating the semiconductor laser after caused to pass through a high-pass and a low-pass filter, respectively.

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