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Authors: M. Wang, A. Ribeiro, Y. Xing, W. Bogaerts
Title: Tolerant, Broadband Tunable 2x2 Coupler Circuit
Format: International Journal
Publication date: 2/2020
Journal/Conference/Book: Optics Express
Editor/Publisher: OSA, 
Volume(Issue): 28(4) p.5555-5566
DOI: 10.1364/OE.384018
Citations: 24 ( - last update: 14/7/2024)
19 (OpenCitations - last update: 27/6/2024)
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We propose a circuit design for a broadband tunable 2x2 waveguide coupler, consisting of a two-stage Mach-Zehnder interferometer with electro-optic phase shifters in each stage. We demonstrate that such design can be configured as a tunable coupler with arbitrary coupling ratio and with a uniform response over 50-nm spectral range around 1550~nm. The design is also tolerant to fabrication variations that affect the coupling ratios of the directional couplers.

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