Wavelength independent multimode interference coupler Journal Articles uri icon

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  • 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.


  • Maese-Novo, A
  • Halir, R
  • Romero-García, S
  • Pérez-Galacho, D
  • Zavargo-Peche, L
  • Ortega-Moñux, A
  • Molina-Fernández, I
  • Wangüemert-Pérez, JG
  • Cheben, Pavel

publication date

  • March 25, 2013