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Branch optical wave-guide

  • US 20050031267A1
  • Filed: 07/26/2004
  • Published: 02/10/2005
  • Est. Priority Date: 08/05/2003
  • Status: Abandoned Application
First Claim
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1. A branch optical wave-guide comprising:

  • a first linear wave-guide;

    a tapered wave-guide for receiving light from a first linear wave-guide and splitting the received light, which is coupled to the first linear wave-guide; and

    a plurality of branched circuits each having a first curved wave-guide, a second curved wave-guide, and a second linear wave-guide coupled in this order, which are coupled to the tapered wave-guide, wherein, when the central axis line of the first linear wave-guide is set to be a reference line, an open portion of a circular arc that is formed by the central axis line of the first curved wave-guide is coupled to face outward when viewed from the reference line, while an open portion of a circular arc that is formed by the central axis line of the second curved wave-guide is coupled to face inward when viewed from the reference line, and wherein the central axis line of the second linear wave-guide and the reference line form an angle, which is set to be greater than 0 degree, and the second curved wave-guide and the second linear wave-guide are coupled such that the central axis line of the second linear wave-guide gets away from the reference line as the second linear wave-guide gets away from the coupling point with the second curved wave-guide.

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