New design of high transmission efficiency all-optical triplexer based on MIM plasmonic double-triangle-teeth-shaped nano-resonator waveguide structures

In this paper, a new design of high transmission efficiency all-optical triplexer based on metal–insulator–metal (MIM) plasmonic double-triangle-teeth-shaped nano-resonator waveguide structures was proposed. By properly adjusting the height of the triangle-teeth-shaped nano-resonators, certain wavelengths can be filtered out and the crosstalk of each channel also can be greatly reduced. The numerical results show that the proposed MIM plasmonic waveguide structure could really function as an all-optical triplexer with respect to the three wavelengths i.e. λ = 1310 nm, 1490 nm, and 1550 nm, respectively. It can be widely used as the fiber access network element for multiplexer-demultiplexer wavelength selective in fiber-to-the-home (FTTH) communication systems with transmission efficiency higher than 90%. The crosstalks are reduced from − 8.70 to − 149.16 dB for the channel 1, from − 17 to − 83.56 dB for the channel 2, and from − 31.68 to − 99.05 dB for the channel 3, respectively. The FWHM is reduced from 65 to 20 nm for the channel 1, from 100 to 25 nm for the channel 2, and from 110 to 25 nm for the channel 3, respectively.