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Amplifier/filter combination

  • US 5,257,273 A
  • Filed: 02/28/1992
  • Issued: 10/26/1993
  • Est. Priority Date: 03/27/1991
  • Status: Expired due to Fees
First Claim
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1. A fiber optic device comprising:

  • a fiber amplifier having a broad absorption bandwidth with at least one absorption frequency receiving an optical input signal having an input signal frequency bandwidth, and an input pump light signal from a pump light source at frequencies within the broad absorption bandwidth of the fiber amplifier, said fiber amplifier absorbing a portion of the input pump light at said at least one absorption frequency and thereby amplifying the optical input signal and producing an output amplified signal, said fiber amplifier passing an unabsorbed portion of the input pump light at frequencies adjacent to said at least one absorption frequency with the output amplified signal; and

    a fiber filter coupled to said fiber amplifier having a reflection and transmission characteristic for filtering out the unabsorbed portion of the input pump light and reflecting the unabsorbed portion back to the amplifier for absorption therein, and for transmitting the output amplified signal.

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