Optical waveguides – With optical coupler – Particular coupling structure
Patent
1995-10-24
1998-02-17
Bovernick, Rodney B.
Optical waveguides
With optical coupler
Particular coupling structure
385 28, 385 43, 385 42, G02B 626
Patent
active
057199760
ABSTRACT:
An optimized waveguide structure enables the functional integration of various passive optic components on a single substrate. The optimized waveguide structure is characterized by a thicker core layer than used for square core waveguides and a core width that changes according to different functional regions of the optic circuit within which it is incorporated. The height (H) of the waveguide core is determined by the thickness of the core layer defined during the fabrication process and is ideally uniform across the circuit. The width (W) of the core, however, is changed between functional regions by the photo-lithographic mask and the chemical etching during the fabrication process. By way of example, an optimized waveguide structure for a P-doped silica planar waveguide with a .DELTA. approximately 0.6% for wavelength .lambda.=1.2-1.7 .mu.m, has a single uniform height of H=6.7 .mu.m and a width that changes between W=4 .mu.m in a coupler region, W=5.5 .mu.m in a bend region, W=9 .mu.m in a fiber coupling region, and W=10 .mu.m in a phase grating region of a Dragone router. Adiabatic tapers are used as transition regions between regions of different core widths.
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Henry Charles Howard
Laskowski Edward John
Li Yuan P.
Yaffe Henry Howard
Bovernick Rodney B.
Lucent Technologies - Inc.
Song Yisun
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