MUMBAI, India, Nov. 2 -- Intellectual Property India has published a patent application (202541130961 A) filed by Indian Institute Of Technology Madras Iit Madras on December 23, 2025, for Equivalent Circuit Model For Simulating Photonic Directional Couplers.
Inventors include Das, Bijoy Krishna; Chakravorty, Anjan; Ramachandran Nair, Deleep; Goswami, Arnab; and Pandey, Shruti.
The application for the patent was published on October 30, 2026, under issue no. 44/2026.
Abstract: ABSTRACT CIRCUIT FOR SIMULATING A PHOTONIC DIRECTIONAL COUPLER Examples of a circuit for simulating a photonic directional coupler are described. In an example, the circuit may include a first input node and a 5 second input node configured to receive input signals representative of a first input electric field and a second input electric field. The circuit further includes cross-coupling current sources scaled by a cross-coupling factor and controlled by the input nodes. The circuit further includes phase shifting elements coupled between each cross node and a reference node, wherein 10 a reactance value of each phase shifting element is defined in dependence on an angular frequency of an input optical signal. The circuit further includes forward-coupling current sources scaled by a forward coupling factor and cross-transfer current sources controlled by the cross nodes. An output signal at each output node is a superposition of outputs of the 15 forward-coupling and cross-transfer current sources coupled to the output node. 28
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