US2014347720A1PendingUtilityA1

Multimode Optical Amplifier As A Receiver Pre-Amplifier For Free-Space Optical Communications

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Assignee: BAE SYS INF & ELECT SYS INTEGPriority: Jun 24, 2009Filed: Aug 8, 2014Published: Nov 27, 2014
Est. expiryJun 24, 2029(~2.9 yrs left)· nominal 20-yr term from priority
Inventors:Robert T. CarlsonDaniel J. Creeden
H04B 10/11H04B 10/503H01S 3/06754H01S 3/1312H04B 10/112H01S 3/10015H01S 3/094003
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Claims

Abstract

In the method for processing a signal light from free-space by amplifying said signal for free-space optical communications. wherein the improvement includes the steps of (a) pre-amplifying said signal light with low noise; and (b) coupling said signal light into a multimode filter which reduces coupling hisses compared to single mode filters.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . In the method for processing a signal light from free-space by amplifying said signal for free-space optical communications, wherein the improvement comprises the steps of
 (a) pre-amplifying said signal light with low noise; and   (b) coupling said signal light into a multimode filter which reduces coupling losses compared to single mode filters.   
     
     
         2 . The method of  claim 1  wherein step (a) is accomplished for a signal having a wavelength of 1300 μm to 1600 μm in a multimode er-doped fiber amplifier. 
     
     
         3 . The method of  claim 2  wherein step (b) allows for an enhanced acceptance angle. 
     
     
         4 . The method of  claim 3  wherein step (b) allows for the capture of high-order modes of a distorted atmospheric wavefront.

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