Optical waveguide, optical modulator and optical coupler
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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Abstract
An optical waveguide formed in a substrate including: 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.
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Citations
18 Claims
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1. An optical modulator of Mach-Zehnder type comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An optical modulator of Mach-Zehnder type comprising:
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an optical waveguide that is provided at least at one of a branch portion on an optical input side and a branch portion on an optical output side, wherein; the optical waveguide is formed in a substrate having electrooptical effect; the optical waveguide has a curved waveguide and a splitter that is coupled to the curved waveguide and branches; 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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18. An optical modulator of Mach-Zehnder type comprising a substrate that has a waveguide including a splitter and a curved waveguide,
wherein: -
a first end of the curved waveguide is coupled to the splitter; a second end of the curved waveguide acts as an optical input end or an optical output end; the curved waveguide has a low refraction index portion having an effective refraction index that is lower than that of a start point of the curved waveguide, in a waveguide from the start point 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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Specification