Free-space optical communications system with open loop transmit

Details Free-space optical communications system with open loop transmit Free-space optical communications system with open loop transmit

1997-06-18

1999-10-12

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359172, 34082572, H04B 1004, H04B 1000

Patent

active

059662298

ABSTRACT:
An optical transmitter is provided for use in a free-space optical communications system. The transmitter has a laser source with a tunable wavelength and adjustable power. A beam splitter divides the output beam from the laser source. A first portion of the divided beam is transmitted to a remote receiver through the atmosphere. A second portion of the divided beam is passed through a local optical path to a local receiver. The local optical path may be either a portion of the atmosphere local to the transmitter or may be an atmospheric spectral attenuation simulator. Processing circuitry receives signals from the local receiver that indicate the amount of attenuation of the second portion of the beam in the local optical path. The processing circuitry may adjust the wavelength and power output of the laser source to optimize transmission of the first portion of the beam to the receiver based on the amount of the attenuation measured in the local optical path. The processing circuitry may also adjust the wavelength and power of the laser source based on weather data received from a weather data source.

REFERENCES:
patent: 5696859 (1997-12-01), Onaka et al.
patent: 5777773 (1998-07-01), Epworth et al.

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