Journal
IEEE PHOTONICS JOURNAL
Volume 11, Issue 5, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2019.2941742
Keywords
Couplings; Multiplexing; Optical waveguides; Fabrication; Geometry; Directional couplers; Crosstalk; Silicon photonics; Multiplexing equipment
Funding
- National Natural Science Foundation of China [61120106012, 61635001, 61535002]
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A tapered asymmetric directional coupler is considered as a promising structure for high tolerance and efficient on-chip mode (de)multiplexers. However, the optimum geometry parameters selection still remains empirical without specific numerical guidance. Here, an in-depth analysis has been carried out based on coupling mode theory. A theoretical model is built aiming to combine the consideration of device efficiency, mode crosstalk and fabrication tolerance. According to that, mode (de)multiplexers (TE0-TE1, TE0 -TE2, TM0 TM1, TM0 -TM2) with broad operation wavelength (C + L band) and low mode crosstalk (minimum -30 dB) are fabricated. The proposed theoretical model can serve as a guideline for the design and optimization of the tapered ADC based mode (de)multiplexers.
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