Optical communication system

Details Optical communication system Optical communication system

2005-11-15

2005-11-15

Sedighian, M. R. (Department: 2633)

Optical communications

Transmitter

Having particular modulation

C398S031000, C398S032000, C398S115000, C370S485000, C370S491000

Reexamination Certificate

active

06965739

ABSTRACT:
An optical communication system for optically transmitting transmission data from a transmitting station to a transmitting device includes an adder for adding an intermediate frequency subcarrier signal modulated with data to be transmitted to a pilot carrier signal as a sinusoidal wave, and an electro-optical converter for electro-optically converting the above sum signal to an optical signal by directly modulating a semiconductor laser element having a resonant frequency fr in accordance with the sum signal and transmitting the signal to an optical fiber for a down link. The frequency fIFof the intermediate frequency subcarrier signal and the frequency fLOof the pilot carrier signal satisfyin-line-formulae description="In-line Formulae" end="lead"?fLO−fIF≧1[GHz],in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2×fIF<fLO<(⅔)×fr,in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?fIF<1[GHz], andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2[GHz]<fLO.in-line-formulae description="In-line Formulae" end="tail"?

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patent: 06-098365 (1994-04-01), None
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