In a two-dimensional photonic crystal T-shaped waveguide with a passive switching function, the routing characteristics depending on the input light amplitude and the wavelength are numerically demonstrated by using the frequency-dependent finite-difference time domain method. For typical input electric field amplitudes (E0 = 0.1, 0.5, 1.0, and 1.5 [V/m]), the distribution ratio to the outputs is evaluated from the electric field profile. Additionally, the cross-correlation coefficient and normalized power spectra are considered. For the add/drop circuit in wavelength division multiplexing (WDM) optical network, it has been determined that the add/drop signal wavelength can be tuned by engineering the duplexer at the branching point with specific pillar radii.
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