| 摘要 |
An optical space communication apparatus for communicating by propagating a light signal in free space, including a multiplexer for multiplexing a first pilot signal with a transmission signal, a first converter for converting a first electric signal from the multiplexer into a first light signal, a transmitting optical system for transmitting the first light signal to a party apparatus, a receiving optical system for receiving a second light signal including a second pilot signal, having been transmitted from the party apparatus, a second converter for converting the second light signal into a second electric signal, a first band-pass filter having a pass region including a frequency of the second pilot signal, a first detector for detecting the second electric signal having passed through the first band-pass filter, a second band-pass filter having a pass region not including the frequency of the second pilot signal, a second detector for detecting the second electric signal having passed through the second band-pass filter, an adjuster controlled by a controller, for adjusting an angle of the receiving optical system, and a frequency variable device for making variable a cut-off frequency of a servo system loop filter for the controller, based on signals from the first and second detectors.
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