| 摘要 |
A cable television system ( 100 ) having forward and reverse paths includes, in the reverse path, a digital optical transmitter ( 200 ) for receiving an RF signal, converting it to a digital signal, and adding a digital pilot tone thereto. A laser is driven in accordance with the summed digital signal to generate a digital optical signal representative of the pilot tone and the RF signal. The cable television system ( 100 ) also includes an optical receiver ( 305 ) for receiving the digital optical signal and recovering therefrom the RF signal and the pilot tone. The optical transmitter ( 200 ) and receiver ( 305 ) are coupled by fiber optic communication media ( 110 ).
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