Kumari Meet, Mishra Satyendra K
Department of ECE, UIE, and UCRD, Chandigarh University, Mohali 140413, Punjab, India.
SRCOM Division, Centre Technologic de Telecomunicacions de Catalunya, Castelldefels, 08860 Barcelona, Spain.
Micromachines (Basel). 2025 Jun 24;16(7):738. doi: 10.3390/mi16070738.
Free space optics (FSO) aims to perform as one of the best optical wireless channels to design a reliable, flexible, and cost-effective communication system. In FSO systems, mode-division multiplexing (MDM) transmission is a proven technique to expand transmission capacity per communication link. Thus, a 16 × 10 Gbps MDM-FSO system using fiber Bragg grating (FBG) sensors for the coexistence of communication and sensing, exploiting FSO links to transmit distinct Laguerre-Gaussian (LG) beams at a 1000-1900 m range, is proposed. The results illustrate that the system can transmit higher-order LG beams with sensor temperatures of 20-120 °C over a 1500 m range under clear air, drizzle, and moderate haze weather. Also, an improved performance is achieved in gamma-gamma compared to the log-normal distribution model for 10-10 index modulation under weak-to-strong turbulence. The proposed system is capable of offering a high optical signal-to-noise ratio (OSNR) and gain of 113.39 and 15.43 dB, respectively, at an aggregate data rate of 160 Gbps under different atmospheric scenarios. Moreover, the proposed system achieves better system performance compared to existing works.
自由空间光通信（FSO）旨在成为设计可靠、灵活且经济高效的通信系统的最佳光无线信道之一。在FSO系统中，模式分割复用（MDM）传输是一种经证实的可扩展每个通信链路传输容量的技术。因此，本文提出了一种16×10 Gbps的MDM-FSO系统，该系统使用光纤布拉格光栅（FBG）传感器实现通信与传感的共存，利用FSO链路在1000 - 1900 m范围内传输不同的拉盖尔 - 高斯（LG）光束。结果表明，该系统在晴空、毛毛雨和中度雾霾天气下，能在1500 m范围内传输传感器温度为20 - 120°C的高阶LG光束。此外，在弱到强湍流条件下，对于10 - 10索引调制，与对数正态分布模型相比，伽马 - 伽马模型实现了性能提升。所提出的系统在不同大气场景下，以160 Gbps的总数据速率分别能够提供高达113.39和15.43 dB的高光信噪比（OSNR）和增益。此外，与现有工作相比，所提出的系统实现了更好的系统性能。
