Periodic dielectric waveguide-based cross- and T-connections with a resonant cavity at the junctions |
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Authors: | Hongtao Guo |
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Institution: | State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China |
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Abstract: | We propose a cross-connection and a T-connection in periodic dielectric waveguides (PDWs) with ultrasmall size and high transmission efficiency at λ = 1.55 μm. The cross-connection was formed by introducing a 3 × 3 square dielectric resonant cavity at the cross-junction with a crosstalk of less than 0.8% (about − 21 dB) and a transmission of larger than 93% at the desired output port. The T-connection was formed by introducing a 3 × 5 dielectric resonant cavity with modifications at the T-junction. The total transmission is up to 95%. In addition, different power splitting ratios were also achieved by moving the input waveguide of the T-connection with different displacements. |
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