Optical LNB capable of fast position-adjusting
An optical LNB capable of fast position-adjusting is employed in an LNBF. The optical LNB includes a down-converting device coupled to an OMT of the LNBF for down-converting a polarized signal for generating a first intermediate frequency signal, a branching device for branching the first intermediate frequency signal for generating a second and a third intermediate frequency signals, an electrical/optical converting device coupled to the branching device for converting the second intermediate frequency signal into an optical signal, and a power end for receiving power from a power supply and outputting the third intermediate frequency signal.
1. An optical Low Noise Block down-converter (LNB) capable of fast position-adjusting utilized in a Low Noise Block Down-converter with Integrated Feed (LNBF) of a satellite communication receiving system, the optical LNB comprising:
a down-converting device, coupled to an Orthomode Transducer (OMT) of the LNBF, for down-converting a polarized signal so as to generate a first Intermediate Frequency (IF) signal;
a branching device, for branching the first IF signal, so as to generate a second and a third IF signals;
an electrical/optical converting device, coupled to the branching device, for converting the second IF signal to an optical signal; and
a power end for receiving power and outputting the third IF signal.
2. The optical LNB of claim 1 , wherein the second and the third IF signals are identical to the first IF signal.
3. The optical LNB of claim 1 , wherein the polarized signal is a vertical polarized signal or a horizontal polarized signal.
4. The optical LNB of claim 1 , wherein the polarized signal comprises a vertical polarized signal and a horizontal polarized signal, and the down-converting device comprises:
a first down-converting circuit for down-converting the vertical polarized signal so as to output a fourth IF signal;
a second down-converting circuit for down-converting the horizontal polarized signal so as to output a fifth IF signal; and
a diplexer, coupled to the first and the second down-converting circuits and the branching device, for combining the fourth and the fifth IF signals so as to generate the first IF signal.
5. The optical LNB of claim 4 , wherein the down-converting device further comprises an amplifier, coupled between the diplexer and the branching device.
6. The optical LNB of claim 4 , wherein frequency band of the fourth IF signal is between 0.95 GHz and 3.0 GHz; frequency band of the fifth IF signal is between 3.4 GHz and 5.45 GHz.
7. The optical LNB of claim 1 , wherein the branching device is a direct coupler, a T-type power divider, a resistance power divider, a Wilkinson power divider, a quadrature hybrid power divider, or a ring hybrid power divider.