OPTICAL MODE TRANSFORMER, IN PARTICULAR FOR COUPLING AN OPTICAL FIBER AND A HIGH-INDEX CONTRAST WAVEGUIDE
First Claim
1. An optical mode transformer comprising:
- a first waveguide extending along a first main longitudinal direction and having a first end including an end facet configured to be coupled to an optical fiber, the first waveguide including a first core and a first cladding, and having a first refractive index contrast Δ
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a second waveguide comprising a second core and a second cladding, and having a second refractive index contrast, an end of the second waveguide being butt coupled to a second end of the first waveguide; and
a third waveguide being arranged with respect to the second waveguide so as to realize an evanescent optical coupling with the second waveguide, the third waveguide comprising a third core and a third cladding, and having a third refractive index contrast, the third core including a tapered region in at least a portion of which the evanescent coupling takes placed; and
wherein the first refractive index contrast is less than the second refractive index contrast, the second refractive index contrast is less than the third refractive index contrast, and the third refractive index contrast is not less than 18%.
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Abstract
An optical mode transformer comprises a first waveguide including a first core, a first cladding and an end facet configured to be coupled to an optical fiber. The transformer further includes a second waveguide comprising a second core, a second cladding and an end directly coupled to an end of the first waveguide. A third waveguide comprises a third core and a third cladding, and is arranged with respect to the second waveguide so as to realize an evanescent optical coupling with the second waveguide. The third core includes a tapered region wherein evanescent coupling takes place, and wherein a refractive index contrast of the first waveguide is less than a refractive index contrast of the second waveguide, the refractive index contrast of the second waveguide is less than a refractive index contrast of the third waveguide, and the refractive index contrast of the third waveguide is not less than 18%.
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Citations
60 Claims
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1. An optical mode transformer comprising:
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a first waveguide extending along a first main longitudinal direction and having a first end including an end facet configured to be coupled to an optical fiber, the first waveguide including a first core and a first cladding, and having a first refractive index contrast Δ
;a second waveguide comprising a second core and a second cladding, and having a second refractive index contrast, an end of the second waveguide being butt coupled to a second end of the first waveguide; and a third waveguide being arranged with respect to the second waveguide so as to realize an evanescent optical coupling with the second waveguide, the third waveguide comprising a third core and a third cladding, and having a third refractive index contrast, the third core including a tapered region in at least a portion of which the evanescent coupling takes placed; and wherein the first refractive index contrast is less than the second refractive index contrast, the second refractive index contrast is less than the third refractive index contrast, and the third refractive index contrast is not less than 18%. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60)
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2-41. -41. (canceled)
Specification