Spatial light transmission apparatus

Optical: systems and elements – Deflection using a moving element – Using a periodically moving element

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359110, 359152, 359191, H04B 1000

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active

055484344

ABSTRACT:
A spatial coherent light transmission apparatus according to the present invention, includes: a light transmitter for emitting a data signal as first coherent light; a light receiver for emitting second coherent light having a wavelength little different from that of The first coherent light, mixing and receiving the first and second coherent lights, and performing a coherent detection of the data signal. At least one of the light transmitter and the light receiver has a detection device for detecting at least one of a coherent light transmission state and a coherent light detection state. The apparatus further includes a control device for controlling at least one of the light transmitter and the light receiver based on information of the state detected by the detection device.

REFERENCES:
patent: 4706300 (1987-11-01), Minemura et al.
Patent Abstracts of Japan, vol. 11, No. 187 (E-1067) 1991 & JP-A-03 046 839 (NEC).
Nussmeier et al., "A 10.6-.mu.m Terrestrial Communication Link", IEEE Journal of Quantum Electronics, vol. 10, No. 2, Feb. 1974, New York US, pp. 230-235.
Mercer, "Adaptive Coherent Optical Receiver Array", Electronics Letters, vol. 26, No. 18, 30 Aug. 1990, Stevenage GB.

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