Silicon nitride polarisation beam splitters: a review

Tosi, Mauricio; Fasciszewki, Alejandro; Rossini, Laureano A. Bulus; Caso, Pablo A. Costanzo

doi:10.1049/iet-opt.2019.0079

Cited by 7 publications

(2 citation statements)

References 40 publications

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“…In [16] the layout is quite complex, as it is based on handling the first order TM mode from cascaded asymmetric DCs and achieves 80 nm wide operation at the expense of minimum PER, that is only 10 dB. The PBS in [25] is based on cascaded multimode interferometers with very good performance in terms of overall footprint, losses and operational range, but again the minimum PER is only 10 dB for 100 nm range. In [13] the polarization splitting is relying on a horizontal multi-slot waveguide demonstrating 100 nm bandwidth with more than 20 dB PER within a length of 286 µm.…”

Section: Discussionmentioning

confidence: 99%

Design and Optimization of a Compact Ultra-Broadband Polarization Beam Splitter for the SCL-Band Based on a Thick Silicon Nitride Platform

et al. 2022

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The polarization beam splitter is an essential photonic integrated circuit in applications where a high-performing on-chip polarization diversity scheme is required. The lower refractive index contrast of the silicon nitride material platform compared to silicon-on-insulator constitutes the separation of polarized light states a challenging task since for this purpose a large difference between the effective refractive indices of the fundamental TE and TM modes is highly desirable. In this paper, we present the design and optimization analysis of an ultra-broadband polarization beam splitter based on a thick silicon nitride platform through extensive 3D-FDTD simulations. The proposed device exploits two different Si3N4 thicknesses that enable the discrimination of the two polarizations at the proximity of an 800 nm thick slot and a 470 nm thick strip waveguide via directional coupling. The proposed two-stage PBS achieves higher than 30.6 dB polarization extinction ratio (PER) for both TE and TM polarizations across a 130 nm span at the SCL-band. The dimensions of the PBS are 94 × 14 μm2 and the insertion losses are calculated to be lower than 0.8 dB for both polarizations. The fabrication tolerance of the device is also discussed.

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Section: Discussionmentioning

confidence: 99%

Design and Optimization of a Compact Ultra-Broadband Polarization Beam Splitter for the SCL-Band Based on a Thick Silicon Nitride Platform

et al. 2022

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“…However, most silicon photonics devices are generally very sensitive to polarization. A potentially effective approach is to split the light of different polarization modes into devices that process different polarization states separately, thereby requiring efficient and compact polarization beam splitters (PBS) [10,11]. The working principle of traditional on-chip compact PBSs is usually based on modal evolution [12] or interferometry, including asymmetric directional couplers (ADCs) [13][14][15][16][17][18][19][20][21], Mach-Zehnder interferometers (MZIs) [22][23][24], photonic crystal waveguides [17], multi-mode interference couplers (MMIs) [25,26], etc.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Compact Digital Metasurface Polarization Beam Splitter via Physics-Constrained Inverse Design

et al. 2022

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Inverse design effectively promotes the miniaturization of integrated photonic devices through the modulation of subwavelength structures. Utilizing a theoretical prior based inverse design, we propose an ultra-compact integrated polarizing beam splitter consisting of a standard silicon-on-insulator (SOI) substrate and a tunable air–silicon column two-dimensional code metasurface, with a footprint of 5 × 2.7 μm2. The effective refractive index of the waveguide is modulated by adjusting the two-dimensional code morphology in the additional layer to achieve efficient polarization beam splitting. The simulation results demonstrate high performance, with a low insertion loss (<0.87 dB) and high extinction ratio (>10.76 dB) in a bandwidth of 80 nm covering the C-band. The device can withstand manufacturing errors up to ±20 nm and is robust to process defects, such as the outer proximity effect, and thus is suitable for ultra-compact on-chip optical interconnects.

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Recent Progress in Light Polarization Control Schemes for Silicon Integrated Photonics

Zafar,

Pereira

2024

Laser & Photonics Reviews

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Light polarization control is a target in photonics, and this paper provides a comprehensive review of research from various groups on the silicon‐on‐insulator (SOI) platform. It draws comparisons between devices such as polarization splitters (PS), polarizers, and polarization splitters/rotators (PSR). These devices are fabricated using various technologies, including silicon nanowires, ridge waveguides, hybrid plasmonic waveguides, and subwavelength grating (SWG) waveguides. A detailed review of polarizers used as cleanup filters in splitters is initiated. Subsequently, various polarization splitters utilizing asymmetric directional couplers (ADCs), which typically exhibiting low extinction ratios (ERs), are delved. To enhance ERs, a detailed comparison of methods outlined in the literature is provided. One notable method includes integrating on‐chip polarizers at both ports to eliminate unwanted light fractions and achieve exceptionally high ERs. Furthermore, SWG‐based polarizers and splitters commonly face issues with Bragg reflections that can affect other photonic devices and lasers and ways to minimize unwanted polarization back reflections in SWG‐designed polarization control devices are examined. Finally, emerging applications in mid‐infrared (MIR) sensing are explored, highlighting the necessity of polarization rotators for on‐chip transverse electric (TE) operation, since quantum cascade lasers, the primary sources in this range, emitting radiation in the (TM) mode.

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Silicon nitride polarisation beam splitters: a review

Cited by 7 publications

References 40 publications

Design and Optimization of a Compact Ultra-Broadband Polarization Beam Splitter for the SCL-Band Based on a Thick Silicon Nitride Platform

Design and Optimization of a Compact Ultra-Broadband Polarization Beam Splitter for the SCL-Band Based on a Thick Silicon Nitride Platform

Ultra-Compact Digital Metasurface Polarization Beam Splitter via Physics-Constrained Inverse Design

Recent Progress in Light Polarization Control Schemes for Silicon Integrated Photonics

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