Thirty-two-channel dense-wavelength-division multiplexer based on cascade two-dimensional photonic crystal waveguide structure

The 32-channel dense-wavelength-division multiplexer is composed of the artificial point and line defects in the cascade two-dimensional photonic crystal waveguide with square lattice. The point defect traps the photons propagating through the line defect and emits to free space by the resonant effect. The cascade structure could overcome the mini-stop-band effect and established a continuous-wavelength multiplexing characteristic. The wavelength spacing of 0.8 nm (frequency spacing of 100 GHz), the interchannel cross talk of approximately −21 to −32 dB, and high quality factor Q of 12,500 were achieved through theoretical simulation. It would be a potential component in the application of ultra-high-speed and ultra-high-capacity optical communication and optical data processing systems.