Principles and application of reduced beat length in MMI couplers.

  title={Principles and application of reduced beat length in MMI couplers.},
  author={Lung-Wei Chung and San-Liang Lee and Yen-Juei Lin},
  journal={Optics express},
  volume={14 19},
A unified method was proposed to reduce the beat length of a multimode interference (MMI) coupler. By properly adjusting the phase difference of the N-fold images, the mode evolution is changed to generate self-images at a much shorter distance. The effect of adjusting the phase difference can be regarded as dividing the original MMI coupler into multiple sub-MMI couplers. Such an effect can be applied for both symmetric- and paired-interference cases. We applied the principle to design compact… CONTINUE READING

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