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Optical waveguide, optical modulator and optical coupler

  • US 8,824,836 B2
  • Filed: 03/01/2011
  • Issued: 09/02/2014
  • Est. Priority Date: 06/10/2010
  • Status: Expired due to Fees
First Claim
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1. An optical modulator of Mach-Zehnder type comprising:

  • a curved waveguide; and

    a splitter that is coupled to the curved waveguide and branches,wherein a low refraction index portion having an effective refraction index that is lower than that of a start point of the curved waveguide on an opposite side of the splitter is provided in a waveguide extending from the start point of the curved waveguide to the splitter;

    the low refraction index portion has a curve; and

    the effective refraction index of the curve of the low refraction index portion increases or decreases continuously or in steps toward the splitter.

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