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GAIN
A measure of the increase in forward transmitter power of an antenna or telescope with respect to that of an isotropic radiator. An antenna is said to have a "directivity" since it directs more energy in one direction. It is proportional to the aperture area of the telescope and inversely proportional to the square of the wavelength. Even small optical telescopes can have very high gain, since the wavelength is so small. Typically a 10 meter diameter visible telescope has a gain of about 1015 (150 dB), while a 100 meter diameter microwave dish operating at 10 GHz has a gain of only 108 (80 dB). This is a difference of a factor of 107 (70 dB), i.e., 10 million times. No wonder then, that optical uplinks are vastly superior to their microwave counterparts!
Global Aviation Information Network
The ratio of output optical power to input power, usually given in units of dB. Usually represents an increase in an optical signal; a negative gain means a loss of power.
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Science Dictionary INDEX:List of Terms: Terms beginning with "A", Page 1 |
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 A: Page 1 of 22. |
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