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Symmetric polarization-insensitive directional couplers fabricated by femtosecond laser writing

Corrielli, Giacomo, Atzeni, Simone, Piacentini, Simone, Pitsios, Ioannis, Crespi, Andrea and Osellame, Roberto 2018. Symmetric polarization-insensitive directional couplers fabricated by femtosecond laser writing. Optics Express 26 (12) , pp. 15101-15109. 10.1364/OE.26.015101

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We study analytically the polarization behaviour of directional couplers composed of birefringent waveguides, showing that they can induce polarization transformations that depend on the specific input-output path considered. On the basis of this study, we propose and demonstrate experimentally, by femtosecond laser writing, directional couplers that yield a polarization-independent power splitting and, at the same time, preserve the polarization state of the propagating light. More in detail, we devise two different approaches to realize such devices: the first one is based on local birefringence engineering by additional refractive index modification tracks, while the second one exploits ultra-low birefringence waveguides (b = 1.2 × 10−6), obtained by thermal annealing.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Optical Society of America
ISSN: 1094-4087
Date of First Compliant Deposit: 7 February 2019
Date of Acceptance: 11 May 2018
Last Modified: 07 Feb 2019 12:34

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