Compact ultrabroad-bandwidth cascaded arrayed waveguide gratings
| Autor: | Arthur van Wijk, Christopher Richard Doerr, Zain Ali, Mustafa Karabiyik, B. Imran Akca |
|---|---|
| Přispěvatelé: | LaserLaB - Biophotonics and Microscopy, Biophotonics and Medical Imaging |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
02 engineering and technology 01 natural sciences Transfer function law.invention 010309 optics Optics Optical coherence tomography law 0103 physical sciences medicine SDG 7 - Affordable and Clean Energy Spectral resolution Diffraction grating medicine.diagnostic_test business.industry Bandwidth (signal processing) 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Arrayed waveguide grating Light intensity 0210 nano-technology business Communication channel |
| Zdroj: | Optics Express, 28(10), 14618-14626. The Optical Society van Wijk, A, Doerr, C R, Ali, Z, Karabiyik, M & Imran Akca, B 2020, ' Compact ultrabroad-bandwidth cascaded arrayed waveguide gratings ', Optics Express, vol. 28, no. 10, pp. 14618-14626 . https://doi.org/10.1364/OE.394783 |
| ISSN: | 1094-4087 |
| DOI: | 10.1364/OE.394783 |
| Popis: | Here, we present a compact, high-resolution, and ultrabroad-bandwidth arrayed waveguide grating (AWG) realized in a silicon nitride (Si3N4) platform. The AWG has a cascaded configuration with a 1×3 flat-passband AWG as the primary filter and three 1×70 AWGs as secondary filters (i.e. 210 output channels in total). The primary AWG has 0.5-dB bandwidth of 45 nm over 190 nm spectral range. The ultrabroad-bandwidth is achieved by using an innovative design that is based on a multiple-input multi-mode interference (MMI) coupler placed at the entrance of the first free propagation region of the primary AWG. The optical bandwidth of the cascaded AWG is 190 nm, and the spectral resolution is 1 nm. The overall device size is only 1.1 × 1.0 cm2. Optical loss at the central channel is 4 dB, which is 3 dB less than a conventional design with the same bandwidth and resolution values but using a primary filter with Gaussian transfer function. To the best of our knowledge, this is the first demonstration of an ultrabroad-bandwidth cascaded AWG on a small footprint. We also propose a novel low-loss (∼ 0.8 dB) design using a small AWG instead of an MMI coupler in the primary filter part, which can be used in applications where the light intensity is very weak, such as Raman spectroscopy. |
| Databáze: | OpenAIRE |
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