Optical transmission systems including optical amplifiers, apparatuses and methods

  • US 6,771,413 B2
  • Filed: 01/14/2002
  • Issued: 08/03/2004
  • Est. Priority Date: 04/02/1999
  • Status: Expired due to Term
First Claim
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1. A method of transmitting optical signals, comprising:

  • transmitting optical signals, in an optical signal wavelength range, via a transmission media;

    amplifying the optical signals a plurality of times at a plurality of separate locations to produce a composite optical signal gain profile, wherein amplifying includes counter pumping optical energy in the transmission media in a first pump wavelength range and co-pumping optical energy in the transmission media in a second pump wavelength range to produce Raman amplification of the optical signals; and

    wherein counter pumping includes producing a counter pumping noise figure profile over the optical signal wavelength range corresponding to the Raman amplification; and

    wherein co-pumping includes varying the counter pumping noise figure profile over at least a portion of the optical signal wavelength range; and

    filtering the composite optical signal gain profile produced by amplifying the optical signal a plurality of times to produce a desired gain profile for the optical signals.

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