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Fabrication-tolerant and CMOS-compatible polarization splitter and rotator based on a compact bent-tapered directional coupler
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SYSNO ASEP 0538976 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Fabrication-tolerant and CMOS-compatible polarization splitter and rotator based on a compact bent-tapered directional coupler Author(s) Zafar, H. (AE)
Pereira, Mauro Fernandes (FZU-D) ORCID
Kennedy, K.L. (SA)
Anjum, D.H. (AE)Number of authors 4 Article number 125214 Source Title AIP Advances. - : AIP Publishing
Roč. 10, č. 12 (2020), s. 1-9Number of pages 9 s. Language eng - English Country US - United States Keywords radiowave and microwave technology ; waveguides ; optical fibers ; electric fields ; wave propagation ; optical phase matching Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000598534600002 EID SCOPUS 85097620897 DOI 10.1063/5.0030638 Annotation In this paper, we demonstrate a broadband, low-loss, compact, and fabrication-tolerant polarization splitter and rotator (PSR) on a siliconon-insulator platform. The PSR is based on an asymmetric directional coupler (ADC), which is covered with SiO2 from the top to make it compatible with the standard metal back end of line (BEOL) process. Conventional ADC-based PSRs suffer from stringent fabrication requirements and relatively low bandwidth, while the proposed bent-tapered design is highly insensitive to the fabrication errors (>70 nm tolerance on the coupling gap) with an enlarged bandwidth and a compact footprint of 53 μm × 7 μm. It yields a polarization conversion loss less than 0.7 dB, a transverse electric (TE) insertion loss better than 0.3 dB, an ultra-low crosstalk with the TE extinction better than 30 dB, and the transverse magnetic extinction better than 25 dB, over a 200 nm wavelength range (1.5 μm–1.7 μm), in both ports. At the 1.55 μm wavelength, the calculated ultra-low polarization conversion loss and TE insertion loss are 0.27 dB and 0.08 dB, respectively. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2021 Electronic address http://hdl.handle.net/11104/0316707
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