A new design approach to large input/output number multimode interference couplers and its application to low-crosstalk WDM routers

@article{Huang1998AND,
  title={A new design approach to large input/output number multimode interference couplers and its application to low-crosstalk WDM routers},
  author={J. Z. Huang and Rob Scarmozzino and R B Osgood},
  journal={IEEE Photonics Technology Letters},
  year={1998},
  volume={10},
  pages={1292-1294}
}
A new design approach for N/spl times/N multimode interference (MMI) couplers with large N is described which yields a device design with extremely low imbalance and insertion loss. Analytical expressions for the phase errors in MMI devices are derived from basic principles; these expressions enable significant phase-error reduction to be obtained by optimizing the index-contrast. This optimization in conjunction with the proper placement of the access waveguides allows significant improvement… CONTINUE READING
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