Optical IF signal distribution circuits for DBS receivers

Describes two optical transmission systems, each of which is designed to transmit the direct broadcasting satellite (DBS) IF signal from the low-noise converter (LNC) to the DBS receiver through optical fiber. One transmits the IF signal for a specific channel from the LNC to the DBS receiver while the control signal is transmitted through the same optical fiber in the opposite direction. The other transmits the IF signal for all the channels with no control signal transmitted, after the DBS IF signal sent from an LNC is converted into an IF wideband signal of 300 MHz (35-335 MHz). The frequency spectrum of the IF signal is shown