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Optical wavelength division node

  • US 8,682,164 B2
  • Filed: 03/22/2012
  • Issued: 03/25/2014
  • Est. Priority Date: 11/17/2011
  • Status: Active Grant
First Claim
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1. An optical wavelength division node connected with and provided between an optical line terminal (OLT) and a plurality of optical network unit (ONU), comprising:

  • an optical splitter for receiving a downstream signal light source with a single wavelength transmitted by the OLT and splitting the received downstream signal light source into a first-path signal light source and a second-path signal light source;

    a plurality of optical circulators sequentially and individually connected to each of the plurality of ONUs, wherein the optical circulator in a first-order position receives the first-path signal light source transmitted by the optical splitter and transmits the first-path signal light source received from the optical splitter to the ONU in a first-order position, so as to receive a return signal transmitted by the ONU in the first-order position and then pass the return signal received from the ONU in the first-order position to the optical circulator in a second-order position, until the optical circulator in a last-order position receives the return signal transmitted by the ONU in a last-order position and transmits the return signal received from the ONU in the last-order position; and

    a colorless light source module for receiving the second-path signal light source transmitted by the optical splitter and the return signal transmitted by the optical circulator in the last-order position, and using the second-path signal light source to modulate the return signal received from the optical circulator in the last-order position to generate an upstream signal light source to be then transmitted back to the OLT by the optical splitter;

    wherein the colorless light source module comprises at least two colorless light source transceivers, a first switch and a second switch;

    wherein the first switch is connected with the two colorless light source transceivers and the optical circulator in the last-order position; and

    wherein the second switch is connected with the two colorless light source transceivers and the optical splitter.

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