Patent ID: 8351796

Claim:
An optical low-noise block downconverter comprising: a first down-converting circuit, for down-converting and filtering a first polarization signal to output a first intermediate-frequency (IF) signal; a second down-converting circuit, for down-converting and filtering a second polarization signal to output a second IF signal, wherein a frequency band of the first IF signal is the same as a frequency band of the second IF signal and a polarization of the first IF signal and a polarization of the second IF signal are orthogonal; an oscillator coupled to the first and the second down-converting circuits, for generating an oscillating signal outputted to the first down-converting circuit and the second down-converting circuit; a first optical transmitter coupled to the first down-converting circuit, for converting the first IF signal into a first optical signal; and a second optical transmitter coupled to the second down-converting circuit, for converting the second IF signal into a second optical signal.