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Optical transmission apparatus, optical transmission system, and optical terminal station

  • US 20020101633A1
  • Filed: 12/31/2001
  • Published: 08/01/2002
  • Est. Priority Date: 04/02/1998
  • Status: Active Grant
First Claim
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1. A transmission ring system, transmitting a plurality of wavelength channels, comprising:

  • a first transmission line on which a first portion of the wavelength channels are used for current use, and a second portion of the wavelength channels are used for standby use, wherein an optical signal is transmitted in a first direction via the first transmission line;

    a second transmission line on which the second portion of the wavelength channels are used for current use, and the first portion of the wavelength channels are used for standby use, wherein an optical signal is transmitted in a second direction, opposite the first direction, via the second transmission line; and

    a plurality of nodes, each of which accommodates both the first transmission line and the said second transmission line.

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