| 摘要 |
Method for receiving/trasmitting an optical signal through the air, the method comprising the steps of: providing a first free space optics apparatus; providing a second free space optics apparatus, the first and second apparatuses being spaced by a certain distance; at the first apparatus, transmitting an optical signal through the air at a bit-rate; receiving, at the second apparatus, said optical signal transmitted through the air by the first apparatus. The method being characterized by further comprising the steps of: measuring the power level of the received signal; and operating a switch for accomodating the bit-rate in order to change the fading margin in the apparatus. A lower bit-rate being used when the level of the received power is low and/or in rather bad weather conditions.
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