| Authors: | S. Dwivedi, H. D'heer, W. Bogaerts | | Title: | Maximizing fabrication and thermal tolerances of all-silicon FIR wavelength filtering devices | | Format: | International Journal | | Publication date: | 4/2015 | | Journal/Conference/Book: | Photonics Technology Letters
| | Editor/Publisher: | IEEE, | | Volume(Issue): | 27(8) p.871-874 | | DOI: | 10.1109/LPT.2015.2398464 | | Citations: | 32 (Dimensions.ai - last update: 24/11/2024)
29 (OpenCitations - last update: 27/6/2024)
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Abstract
We propose a method to make silicon optical finite impulse response (FIR) filters tolerant to fabrication (waveguide geometry) and ambient thermal variations. We experimentally demonstrate a Mach-Zehnder interferometer (MZI) filter with fabrication and thermal tolerance, both separately and together. The fabrication-tolerant device measurements show a 20-fold improved tolerance to systematic waveguide linewidth variations, with a wavelength shift of less than 60 pm/nm linewidth change. The fabrication- and thermal-tolerant device is possible by using orthogonal polarizations in the two arms. The fabricated device shows a shift of less than 65 pm/nm and a thermal drift smaller than 15 pm/K over a wavelength range of 40 nm. Simulations show that this concept can be extended to multi-channel filters. Related Research Topics
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