Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-12-22
1996-04-09
Boudreau, Leo
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359161, 359159, H04B 1000
Patent
active
055067166
ABSTRACT:
A method, circuit, and apparatus for mitigating effects of wavelength-dependent atmospheric transmission characteristics on an atmospheric optical telecommunication system. The system comprises two atmospheric optical telecommunication units communicating with one another using light propagated through the atmosphere. Each of the atmospheric telecommunication units includes an optical transmitter having a laser generating a transmitted light beam for reception by the other, and an optical receiver. The optical receiver generates an electrical signal in response to a received light beam received from the other of the atmospheric optical telecommunication units. In the method, an increase in noise above a normal noise level is detected in the electrical signal, and a flag signal is generated in response. The increase in noise is due to the received light beam having a wavelength at which the atmosphere has a wavelength-dependent transmission characteristic. In response to the flag signal, the wavelength of the transmitted light beam is changed to a wavelength at which the transmission characteristic of the atmosphere is less wavelength-dependent.
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patent: 5424860 (1995-06-01), Mihara
Hirashima Akira
Ito Yujiro
Mihara Kanji
Otobe Takashi
Boudreau Leo
Negash Kinfe-Michael
Sammut Charles P.
Sony Corporation
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