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Optical fiber gain medium with evanescent filtering

  • US 6,118,575 A
  • Filed: 04/05/1999
  • Issued: 09/12/2000
  • Est. Priority Date: 03/17/1997
  • Status: Expired due to Fees
First Claim
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1. An optical fiber system having an optical gain medium in which optical energy is generated at both a desired wavelength and an undesired wavelength, the system comprising:

  • a doped fiber core through which the desired wavelength and the undesired wavelength propagate, the undesired wavelength having larger evanescent wings than the desired wavelength; and

    an absorbing material located radially outward from the core, the absorbing material being separated from the core at such a distance that the evanescent wings of the undesired wavelength extend significantly into the absorbing ring, while the evanescent wings of the desired wavelength do not extend significantly into the absorbing ring.

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