PAM4-modulated 2-micron band for enhanced indoor optical communications: experimental evaluation

Author:

Yang Yatao,Cai Junfei,Song YufengORCID,Wang Zhenhong,Wu Weijie,Ji Jianhua

Abstract

This research explores the application of PAM4 modulation to optical signals in the 2-μm wavelength band for indoor optical communication. Experiments conducted in a simulated atmospheric turbulence environment demonstrated a BER of 10−5 for the 2-μm laser carrier with PAM4, surpassing the forward error correction threshold. Power loss comparisons to a back-to-back setup showed minimal degradation under various turbulence levels, with losses of 1.80 dB, 1.91 dB, 2.09 dB, and 2.55 dB for non-turbulent, weak-turbulent, moderate-turbulent, and strong-turbulent conditions, respectively. The system's sensitivity was measured at -7.69 dBm, emphasizing its effectiveness in detecting low-power signals. OptiSystem simulations indicated that PAM4 necessitates a higher optical OSNR than NRZ, suggesting the necessity for sophisticated signal processing techniques for systems operating in the 2-μm band. The study's results contribute to the body of knowledge on high-bandwidth optical communication and suggest future research avenues aimed at enhancing system performance while maintaining cost-effectiveness.

Funder

Natural Science Foundation of Guangdong Province

National Taipei University of Technology-Shenzhen University Joint Research Program

Shenzhen Fundamental Research Program

Publisher

Optica Publishing Group

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