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Terrestrial optical communication network of integrated fiber and free-space links which requires no electro-optical conversion between links

  • US 6,239,888 B1
  • Filed: 04/24/1998
  • Issued: 05/29/2001
  • Est. Priority Date: 04/24/1998
  • Status: Expired due to Term
First Claim
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1. A terrestrial optical communication network comprising a plurality of fiber optic links and free-space links between which optical signals are optically coupled by erbium doped fiber amplifiers (ERDAs), and further comprising means for controlling a -power gain of at least one of the ERDAs in response to an optical signal received over one of the free-space links.

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