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Optical transmission apparatus

  • US 20040190123A1
  • Filed: 03/05/2004
  • Published: 09/30/2004
  • Est. Priority Date: 03/26/2003
  • Status: Active Grant
First Claim
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1. An optical transmission apparatus for amplifying and transmitting an optical signal, the apparatus comprising:

  • a first optical amplifier for inputting first excitation light into an optical fiber transmission line to perform optical amplification with the optical fiber transmission line as an amplification medium;

    a second optical amplifier for inputting second excitation light into an amplification medium in which an active substance for optical amplification is doped to perform optical amplification;

    a first optical level detector for monitoring, before transmitting an optical signal, a level of optical noise scattered by the first optical amplifier by emitting the first excitation light and for detecting an optical level at the time of transmitting the optical signal by subtracting the level of the optical noise monitored from a signal amplified by the first optical amplifier; and

    a second optical level detector for monitoring, before transmitting an optical signal, a level of optical noise emitted from the second optical amplifier by emitting the second excitation light and for detecting an optical level at the time of transmitting the optical signal by subtracting the level of the optical noise monitored from a signal amplified by the second optical amplifier.

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