MUMBAI, India, Jan. 9 -- Intellectual Property India has published a patent application (202511115811 A) filed by Ims Engineering College, Ghaziabad, Uttar Pradesh, on Nov. 23, 2025, for 'system and method for four channel dwdm demultiplexing using photonic crystal hexagonal ring resonators.'
Inventor(s) include Sanjeev Sharma; Prof. Manav Kumar Mishra; Pradeep Kumar; Sourabh Maheshwary; Sarita Devi Sharma; and Naveen Kumar Sharma.
The application for the patent was published on Jan. 9, under issue no. 02/2026.
According to the abstract released by the Intellectual Property India: "The present invention relates to a system and method for four channel dense wavelength division multiplexing demultiplexing using photonic crystal hexagonal ring resonators operating in the C band. A two dimensional dielectric rod lattice forms a bus waveguide that is side coupled to four hexagonal ring resonator cavities, each cavity including a unique central defect hole having a customised radius to select an individual channel wavelength. A multiplexed optical signal in the range of 1530 to 1555 nanometres is launched into the bus waveguide and, through evanescent coupling, four channels are extracted at corresponding output waveguides. The photonic band gap of the lattice is determined using a plane wave expansion method, while electromagnetic field distribution and spectral response are analysed using a finite difference time domain technique. The system achieves maximum channel crosstalk of minus fifteen point two five decibels with an average coupling efficiency of seventy seven point five percent."
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