Electro-optic device
First Claim
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1. An electro-optic device comprising:
- a substrate;
an integrated optical waveguide extending across the substrate; and
means arranged to apply an electrical signal across the waveguide via two doped regions to alter attenuation properties and/or a refractive index of the waveguide by altering the density of charge carriers within the waveguide, the two doped regions each comprising a plurality of doped areas spaced apart from each other in a direction parallel to the length of the waveguide the size and spacing of the doped areas being selected so that the efficiency of the device, in terms of the increase in attenuation or change in refractive index per unit current applied thereto, is increased, wherein the device is an adjustable attenuator.
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Abstract
An electro-optic device is disclosed for altering the density of charge carriers within an integrated optical waveguide. The device includes a substrate, and an integrated optical waveguide extending across the substrate with two doped regions being provided such that an electrical signal can be applied across the doped regions to alter the density of charge carriers within the waveguide. The doped regions can each include a plurality of doped areas spaced apart from each other along the length of the waveguide.
51 Citations
16 Claims
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1. An electro-optic device comprising:
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a substrate;
an integrated optical waveguide extending across the substrate; and
means arranged to apply an electrical signal across the waveguide via two doped regions to alter attenuation properties and/or a refractive index of the waveguide by altering the density of charge carriers within the waveguide, the two doped regions each comprising a plurality of doped areas spaced apart from each other in a direction parallel to the length of the waveguide the size and spacing of the doped areas being selected so that the efficiency of the device, in terms of the increase in attenuation or change in refractive index per unit current applied thereto, is increased, wherein the device is an adjustable attenuator.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An electro-optic device comprising:
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a substrate; and
an integrated optical waveguide extending across the substrate, wherein the waveguide comprises a series of two or more curved portions curving in alternating directions, each having an n-doped region adjacent an outer side of the curved portions and a p-doped region adjacent an inner side of the curved portion so as to form a series of diodes of alternating polarity along the length of the waveguide.
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Specification