Cladding modulated silicon waveguide Bragg grating with TM-polarized light for optical true time delay line

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An optical true time delay line (OTTDL) is an essential component in optical signal processing. A Bragg grating structure is usually employed in OTTDL design, which makes it possible to achieve a slow-light effect. Here, we present the design and experimental demonstration of a cladding modulated waveguide Bragg grating (CMWBG) that supports transverse magnetic polarization for OTTDL application. In contrast to traditional waveguide Bragg gratings that support transverse electric polarization, the proposed structure has low propagation loss and high fabrication tolerance characteristics. The slow-light effect of the CMWBG was experimentally demonstrated with a high group index value. An averaged maximum group delay value of up to 84.4 ps was achieved at a length of 1 mm CMWBG, and a tuning range of about 81.4 ps was obtained.
Publisher
AIP Publishing
Issue Date
2023-11
Language
English
Article Type
Article
Citation

APPLIED PHYSICS LETTERS, v.123, no.19

ISSN
0003-6951
DOI
10.1063/5.0169731
URI
http://hdl.handle.net/10203/315297
Appears in Collection
EE-Journal Papers(저널논문)
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