Lighting fixture compatible NIR laser-based 16QAM-OFDM modulated visible light communication

Faheem Ahmad; Sathisha Ramachandrapura Nagaraju; Jyothsna K. M.; Varun Raghunathan

doi:10.1117/12.2609498

3 March 2022 Lighting fixture compatible NIR laser-based 16QAM-OFDM modulated visible light communication

Faheem Ahmad, Sathisha Ramachandrapura Nagaraju, Jyothsna K. M. , Varun Raghunathan

Proceedings Volume 12027, Metro and Data Center Optical Networks and Short-Reach Links V; 120270V (2022) https://doi.org/10.1117/12.2609498
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

We explore the use of 785 nm near-infrared laser source for the giga-bit class indoor visible light communication system compatible with the lighting fixture. The NIR laser light can easily hide behind the white LED light. For the proof-of-concept, a hybrid source is used as light source which consists of a white LED ring and a NIR laser diode. To avoid the non-uniform distribution of color and to improve the illumination performance, light is diffused using diffuser plate with full-width half-maximum (FWHM) of 20^o. A glass lens is used to direct the light towards the receiver. White light from the LED with and without NIR is demonstrated with International Commission on Illumination (CIE 1931 XYZ color space) (.3186, .3293), a correlated color temperature of ~6100 K, and a color rendering index of 74.2 to provide an illuminance of 29.7 lux. To check the eye safe point-to-point communication capacity over a link length of 2- meters, 16QAM-OFDM format is used to directly modulate the NIR laser diode with the data rate of 3 Gbps (Bit-errorrate (BER) < 3.8×10^-3). Such a high-speed LED-LD mixed VLC system without any channel interference can be used to simultaneously provide data transmission and white lighting in an indoor environment.

Conference Presentation

Citation Download Citation

Faheem Ahmad, Sathisha Ramachandrapura Nagaraju, Jyothsna K. M. , and Varun Raghunathan "Lighting fixture compatible NIR laser-based 16QAM-OFDM modulated visible light communication", Proc. SPIE 12027, Metro and Data Center Optical Networks and Short-Reach Links V, 120270V (3 March 2022); https://doi.org/10.1117/12.2609498

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