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Optical amplifier and optical transmission system including the optical amplifier

  • US 6,038,063 A
  • Filed: 03/18/1998
  • Issued: 03/14/2000
  • Est. Priority Date: 10/16/1997
  • Status: Expired due to Term
First Claim
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1. An optical amplifier comprising:

  • an optical amplifying unit having a gain for wavelength division multiplexed (WDM) signal light obtained by wavelength division multiplexing a plurality of optical signals having different wavelengths;

    first control means for detecting an output level of said optical amplifying unit and controlling said optical amplifying unit so that said output level becomes constant;

    second control means for detecting said gain according to an input level of said optical amplifying unit and said output level and controlling said optical amplifying unit so that said gain becomes constant; and

    selecting means for alternatively selecting and operating said first and second control means in accordance with a predetermined rule.

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