Details

Autor(en) / Beteiligte

• Oser, Dorian
• Pérez-Galacho, Diego
• Le Roux, Xavier
• Tanzilli, Sébastien
• Vivien, Laurent
• Labonté, Laurent
• Cassan, Éric
• Alonso-Ramos, Carlos

Titel

Silicon subwavelength modal Bragg grating filters with narrow bandwidth and high optical rejection

Ist Teil von

• Optics letters, 2020-10, Vol.45 (20), p.5784-5787

Ort / Verlag

Washington: Optical Society of America

Erscheinungsjahr

2020

Link zum Volltext

Quelle

OSA Publishing

Beschreibungen/Notizen

• Waveguide Bragg grating filters with narrow bandwidths and high optical rejections are key functions for several advanced silicon photonics circuits. Here, we propose and demonstrate a new, to the best of our knowledge, Bragg grating geometry that provides a narrowband and high rejection response. It combines the advantages of subwavelength and modal engineering. As a proof-of-concept demonstration, we implement the proposed Bragg filters in 220-nm-thick Si technology with a single etch step. We experimentally show flexible control of the filter selectivity, with measured null-to-null bandwidths below 2 nm, and strength of 60 dB rejection with a null-to-null bandwidth of 1.8 nm.