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Processing of multiple wavelength signals transmitted through free space

  • US 7,072,591 B1
  • Filed: 01/21/2002
  • Issued: 07/04/2006
  • Est. Priority Date: 06/23/1999
  • Status: Expired due to Term
First Claim
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1. A method for receiving high frequency signals, comprising:

  • transmitting a coherent beam comprising at least one signal including first and second data modulated onto the beam from a laser transmitter through atmospheric turbulence to a receiver, wherein a diameter of the beam comprising said at least one signal is less than an inner scale of an atmosphere at an aperture of said transmitter, wherein a divergence angle of the beam is selected so that it exceeds a determined turbulence induced beam deviation so that a far-field footprint of the beam remains on the receiver aperture despite the atmospheric turbulence, wherein the receiver is located at a distance from the transmitter, wherein the at least one signal, after transmission through the atmospheric turbulence, has a distorted wave-front, wherein said transmitting of said first and second data is conducted at a rate greater than one gigabit/second, and wherein each of said first and second data is associated with first and second wavelength channels, respectively, the first wavelength channel being different from the second wavelength channel;

    receiving said at least one distorted signal including said first and second data at a detector assembly associated with said receiver;

    detecting said first data using a first detector unit of the detector assembly, wherein the first detector unit is located at a first position; and

    detecting said second data using a second detector unit of the detector assembly, wherein the second detector unit is located at a second position that is different from said first position.

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