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Optical circuit and linear system dedicated node apparatus, linear system WDM network, and tree system WDM network using such

  • US 20070104488A1
  • Filed: 12/22/2006
  • Published: 05/10/2007
  • Est. Priority Date: 07/09/2004
  • Status: Abandoned Application
First Claim
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1. An optical circuit that is attachable to a ring system dedicated node apparatus, which performs add/drop on an optical signal received from a first network and transmits to a second network, so as to convert the ring system dedicated node apparatus into a linear system dedicated node apparatus that performs add/drop on an optical signal received from the first or second network and transmit to the second or first network, the optical circuit comprising:

  • an optical filter having a characteristic of reflecting an optical signal band supplied from the second network and transmitting an optical signal band supplied from the first network, and transmitting an occupied band of an add light in the ring system dedicated node apparatus to which the own circuit is attached at a predetermined transmission rate and reflecting the reminder.

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