MUMBAI, India, Feb. 13 -- Intellectual Property India has published a patent application (202541125593 A) filed by Sri Sai Ram Engineering College, Chennai, Tamil Nadu, on Dec. 12, 2025, for 'underwater optical communication from auv's to airborne devices.'
Inventor(s) include Ranjith Maran; Nithish K S; Dhaanish Ahmed J; and Myvizhi Sel Vi V.
The application for the patent was published on Feb. 13, under issue no. 07/2026.
According to the abstract released by the Intellectual Property India: "In underwater environments a laser-based underw:lter optical communication system designed to enable reliable and energyefficient transmission of environmental sensor data in aquatic environments. Traditional underwater communication methods, such as acoustic and radio frequency systems, suffer from limitations inclucing low bandwidth, high latency, and severe attenuation. To address these challenges, the propcsed system utilizes a compact sensor-integrated transmitter module that collects real-time ~temperature, salinity, and depth measurements using a DS 18B20 sensor, TDS sensor, and ultrasonic sensor. The measured data is processed by a NodeMCU microcontroller, structured into digital packets, and encoded onto a :ontinuo~swave laser through non-return-to-zero (NRZ) modtilation. The optical signal is 1ransmitted through a line-of-sight underwater channel and detected at the receiver end using a photodiode or solar- panel-based optical detector. Signal conditioning, amplification, and filtering are applied to reconstruct the transmitted bitstream. Experimental simulation and SNR analysis demonstrate that the system maintains stable performance with minimal distortion under varying underwater conditions. The results confirm the feasibility of the proposed system for shortrange underwater r::~onitoring, AUV-to-buoy communic:J.tion."
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