Wavelength independent multimode interference coupler

We propose an ultra-broadband multimode interference (MMI) coupler with a wavelength range exceeding the O, E, S, C, L and U optical communication bands. For the first time, the dispersion property of the MMI section is engineered using a subwavelength grating structure to mitigate wavelength depend...

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Bibliographic Details
Published inOptics express Vol. 21; no. 6; pp. 7033 - 7040
Main Authors Maese-Novo, A, Halir, R, Romero-García, S, Pérez-Galacho, D, Zavargo-Peche, L, Ortega-Moñux, A, Molina-Fernández, I, Wangüemert-Pérez, J G, Cheben, P
Format Journal Article
LanguageEnglish
Published United States 25.03.2013
Subjects
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Refractometry - instrumentation
Surface Plasmon Resonance - instrumentation
Telecommunications - instrumentation
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Summary:We propose an ultra-broadband multimode interference (MMI) coupler with a wavelength range exceeding the O, E, S, C, L and U optical communication bands. For the first time, the dispersion property of the MMI section is engineered using a subwavelength grating structure to mitigate wavelength dependence of the device. We present a 2 × 2 MMI design with a bandwidth of 450nm, an almost fivefold enhancement compared to conventional designs, maintaining insertion loss, power imbalance and MMI phase deviation below 1dB, 0.6dB and 3°, respectively. The design is performed using an in-house tool based on the 2D Fourier Eigenmode Expansion Method (F-EEM) and verified with a 3D Finite Difference Time Domain (FDTD) simulator.
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ISSN:1094-4087
DOI:10.1364/OE.21.007033