Optimizing resolution in an integrated blazed chirped Bragg grating spectrometer
Optimizing resolution in an integrated blazed chirped Bragg grating spectrometer
We present an investigation into the resolution of blazed chirped Bragg grating spectrometers. These are dispersive spectrometers that diffract light out of a waveguide at a wavelength dependent angle, whilst focusing the light. The spectral resolution is found to be inversely proportional to grating length; previously used fabrication schemes limited the grating length (and hence resolution) when creating compact devices. We propose and implement a solution to this problem by varying the blaze angle of a Bragg grating along its length. Initial results show the fabrication of longer gratings (while preserving focal length) and an increase in FWHM resolution from 0.57 nm to 0.52 nm. This increase in resolution is thought to be limited by the appearance of aberrations which can be corrected for in future devices.
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Field, James W.
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Berry, Sam A.
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Bannerman, Rex H. S.
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Gawith, Corin B. E.
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Smith, Peter G. R.
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Gates, James C.
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García-blanco, Sonia M.
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Cheben, Pavel
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25 February 2020
Field, James W.
32c0a78d-b9dc-4987-b063-9fbbecec23e3
Berry, Sam A.
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Bannerman, Rex H. S.
7f7d5c3e-8e5d-45d5-8fd7-8d1511330e08
Gawith, Corin B. E.
926665c0-84c7-4a1d-ae19-ee6d7d14c43e
Smith, Peter G. R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Gates, James C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
García-blanco, Sonia M.
fceca377-1318-4554-af33-a89fd234b2c0
Cheben, Pavel
ab8ffd13-bc5c-44cb-88ed-605e3c347848
Field, James W., Berry, Sam A., Bannerman, Rex H. S., Gawith, Corin B. E., Smith, Peter G. R., Gates, James C., García-blanco, Sonia M. and Cheben, Pavel
(2020)
Optimizing resolution in an integrated blazed chirped Bragg grating spectrometer.
Integrated Optics: Devices, Materials, and Technologies XXIV, San Francisco, United States.
01 - 06 Feb 2020.
.
(doi:10.1117/12.2546195).
Record type:
Conference or Workshop Item
(Paper)
Abstract
We present an investigation into the resolution of blazed chirped Bragg grating spectrometers. These are dispersive spectrometers that diffract light out of a waveguide at a wavelength dependent angle, whilst focusing the light. The spectral resolution is found to be inversely proportional to grating length; previously used fabrication schemes limited the grating length (and hence resolution) when creating compact devices. We propose and implement a solution to this problem by varying the blaze angle of a Bragg grating along its length. Initial results show the fabrication of longer gratings (while preserving focal length) and an increase in FWHM resolution from 0.57 nm to 0.52 nm. This increase in resolution is thought to be limited by the appearance of aberrations which can be corrected for in future devices.
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Published date: 25 February 2020
Venue - Dates:
Integrated Optics: Devices, Materials, and Technologies XXIV, San Francisco, United States, 2020-02-01 - 2020-02-06
Identifiers
Local EPrints ID: 468089
URI: http://eprints.soton.ac.uk/id/eprint/468089
PURE UUID: 34be1d69-c7eb-49de-a3c6-6a18bbc2fa9b
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Date deposited: 01 Aug 2022 16:58
Last modified: 17 Mar 2024 02:52
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Contributors
Author:
James W. Field
Author:
Sam A. Berry
Author:
Sonia M. García-blanco
Author:
Pavel Cheben
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