Mode transformer between low index difference waveguide and high index difference waveguide
First Claim
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1. A dielectric waveguide optical mode transformer comprising:
- a first dielectric channel waveguide including a first core having a first tapered region and surrounded by a cladding; and
a second dielectric channel waveguide including a second core having a second tapered region and surrounded by said cladding, a portion of said second tapered region being embedded within said first tapered region with an embedded length ranging upwards from 0, wherein the embedded portion of said second tapered region is completely surrounded by said first tapered region in the cross-section transverse to the mode transformation direction, and wherein the embedded length of said second tapered region within said first tapered region is 0 when the tips of said first and second tapered regions are in contact.
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Abstract
A mode transformer that enables low-loss coupling between optical modes of two waveguides with different index difference. The mode size and the effective index are gradually changed between two waveguides to gradually transform the mode shape, size, and speed with minimum power loss. The mode transformer is useful for coupling the mode of an optical fiber waveguide with low index difference to the mode of a planar high index difference waveguide, and vice versa.
22 Citations
44 Claims
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1. A dielectric waveguide optical mode transformer comprising:
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a first dielectric channel waveguide including a first core having a first tapered region and surrounded by a cladding; and
a second dielectric channel waveguide including a second core having a second tapered region and surrounded by said cladding, a portion of said second tapered region being embedded within said first tapered region with an embedded length ranging upwards from 0, wherein the embedded portion of said second tapered region is completely surrounded by said first tapered region in the cross-section transverse to the mode transformation direction, and wherein the embedded length of said second tapered region within said first tapered region is 0 when the tips of said first and second tapered regions are in contact. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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24. A dielectric waveguide optical mode transformer comprising:
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a first dielectric waveguide including a first core having a first tapered region and surrounded by a cladding; and
a second dielectric waveguide including a second core having a second tapered region and surrounded by said cladding, a portion of said second tapered region being embedded within said first tapered region with an embedded length ranging upwards from 0, wherein said second core and said cladding define a high index difference waveguide, and wherein the embedded portion of said second tapered region is completely surrounded by said first tapered region in the cross-section transverse to the mode transformation direction, and wherein the embedded length of said second tapered region within said first tapered region is 0 when the tips of said first and second tapered regions are in contact.
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Specification