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Baker, Neil J.
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Topics
Publications (6/6 displayed)
- 2008Modulation instability & bragg soliton formation in a highly nonlinear As2S3 waveguide bragg grating
- 2008Chalcogenide glass photonic chipscitations
- 2008Modulation-instability and pulse-train generation in a highly nonlinear Bragg gratingcitations
- 2007Higher-order mode grating devices in As2S3 chalcogenide glass rib waveguidescitations
- 2007Ultrafast all-optical chalcogenide glass photonic circuitscitations
- 2006High-performance Bragg gratings in chalcogenide rib waveguides written with a modified Sagnac interferometercitations
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article
Higher-order mode grating devices in As2S3 chalcogenide glass rib waveguides
Abstract
<p>We report on the design and fabrication of high-quality long-period gratings in chalcogenide glass (As<sub>2</sub>S<sub>3</sub>) rib waveguides utilizing the strong photosensitivity. Higher-order modes of the rib waveguides are analyzed by inspection of the spectra of Bragg gratings written into these waveguides. Based on these measurements, we infer the effective indices of higher-order modes, which are in good agreement with modeling results using a beam propagation method. High-quality long-period gratings are then designed and written into the rib waveguides using a simple shadow mask technique. Coupling the fundamental to the HE<sub>02</sub> mode strong resonances of up to ∼20 dB depths are obtained. The gratings have a length of L=26 mm and a period of ∧ =86 μm. In situ monitoring of the writing process allows the growth dynamics of the grating to be studied. A theoretical fit to the measured transmission curve gives an average index change of ∼10<sup>-3</sup>.</p>