Optical communication system
First Claim
1. An optical communication system comprising:
- an adder for adding an intermediate frequency subcarrier signal modulated with data to be transmitted and a pilot carrier signal; and
an electro-optical converter for directly modulating a semiconductor laser element having a resonant frequency fr using a signal output from said adder and sending an optical signal through an optical fiber, wherein a frequency fIF of the intermediate frequency subcarrier signal and a frequency fLO of the pilot carrier signal satisfy;
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Accused Products
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 fIF of the intermediate frequency subcarrier signal and the frequency fLO of the pilot carrier signal satisfy
and
131 Citations
10 Claims
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1. An optical communication system comprising:
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an adder for adding an intermediate frequency subcarrier signal modulated with data to be transmitted and a pilot carrier signal; and
an electro-optical converter for directly modulating a semiconductor laser element having a resonant frequency fr using a signal output from said adder and sending an optical signal through an optical fiber, wherein a frequency fIF of the intermediate frequency subcarrier signal and a frequency fLO of the pilot carrier signal satisfy;
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification