Journal ArticleDOI
Silica-based circular cross-sectioned channel waveguides
TLDR
In this article, a technique for fabricating silica channel waveguides with circular cross sections is presented, which reduces the geometrical mismatch between a square or rectangular waveguide and a regular optical fiber.Abstract:
A technique for fabricating silica channel waveguides with circular cross sections is presented. The geometrical mismatch between a square or rectangular waveguide and a regular optical fiber is therefore largely reduced. The fiber-waveguide-fiber coupling loss drops from 1.8 dB to 0.5 dB or less for step index multimode waveguides by applying this technique. The heat treatment applied in the waveguide rounding process also smooths the waveguide sidewalls and results in much lower propagation loss in the waveguides. Uniform Y splitters were fabricated to show the feasibility of using this technique to make integrated optical devices. >read more
Citations
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Journal ArticleDOI
Surface tension-powered self-assembly of microstructures - the state-of-the-art
TL;DR: In this paper, a review of surface tension-powered self-assembly of microstructures is presented, and the demonstrated fabrication processes for accurately determining the assembled shape are discussed, and limits on accuracy and structural distortion are considered.
Patent
Use of amorphous carbon film as a hardmask in the fabrication of optical waveguides
Laurent Vandroux,Herve Monchoix +1 more
TL;DR: In this article, a method for forming a waveguide structure on a substrate surface including forming a cladding layer on the substrate surface, forming a core layer, depositing an amorphous carbon hardmask on the core layer and forming a patterned photoresist layer.
Patent
Methods of forming waveguides and waveguides formed therefrom
TL;DR: In this article, the authors presented methods of forming optical waveguides. The methods involve: (a) forming over a substrate a layer of a photodefinable composition; (b) exposing a portion of the layer to actinic radiation; (c) developing the exposed layer to form a waveguide core structure; and (d) heating the waveguide core structure to a temperature and for a time effective to reflow the structure such that it becomes at least partially rounded in cross-section.
Patent
Microminiature optical waveguide structure and method for fabrication
TL;DR: In this article, a waveguide material, e.g., polymer or doped silica, is deposited and unwanted excess is removed to form pattern masks, and heat is applied to reflow the waveguide precursors into near-circular cross-section waveguides that sit atop the pedestals.
Book ChapterDOI
Silica-on Silicon Integrated Optics
TL;DR: Silica-on-silicon (SiO2 / Si) appears the most promising materials system for integrated optics yet developed as mentioned in this paper, and it has the following major advantages over previously developed and competing technologies (namely Ag, Na ion-exchanged glass, Ti: LiNbO3, GaAlAs / GaAs andlnGaAsP/InP):
References
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Journal ArticleDOI
Fabrication of SiO2-TiO2 glass planar optical waveguides by flame hydrolysis deposition
Masao Kawachi,M. Yasu,T. Edahiro +2 more
TL;DR: In this paper, low-loss SiO2TiO2 planar waveguides of 0.1 dB/cm have been fabricated by flame hydrolysis deposition suitable for mass-production.
Journal ArticleDOI
Very low-loss GeO2-doped silica waveguides fabricated by flame hydrolysis deposition method
TL;DR: In this paper, a GeO/sub 2/-doped silica single-mode waveguide is fabricated by flame hydrolysis deposition and reactive ion-etching methods, and the loss value measured using a 40 cm long waveguide circuit.
Journal ArticleDOI
Refractive-index dispersion of phosphosilicate glass, thermal oxide, and silicon nitride films on silicon
TL;DR: Measurements of the refractive-index dispersion in the 0.6-1.5-microm range of dielectric films commonly used to form optical waveguides on Si show that films containing 2% or more of P reached their equilibrium refractive indices after annealed at 800 degrees C, while undoped silica films require annealing at 1100 degrees C to reach equilibrium.
Journal ArticleDOI
Passive components in the subscriber loop
TL;DR: In this paper, the status of passive optical components for optical fiber subscriber loop systems is reviewed in the context of the most often discussed architectures, and how the components are meeting the key functional requirements of interconnection, furcation and filtration.
Journal ArticleDOI
Microlens formation on VAD single-mode fibre ends
Masao Kawachi,T. Edahiro,H. Toba +2 more
TL;DR: In this article, the authors describe microlens formation process on VAD single-mode fiber ends by a chemical-etching/fire-polishing technique and show that no central dip in the VAD fibres leads to high quality lens formation.