Performance analysis of coherent free-space optics transmission link using in-phase quadrature modulator-based polarization multiplexed-256-quadrature amplitude modulation,Transactions on Emerging Telecommunications Technologies

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Performance analysis of coherent free-space optics transmission link using in-phase quadrature modulator-based polarization multiplexed-256-quadrature amplitude modulation
Transactions on Emerging Telecommunications Technologies ( IF 2.5 ) Pub Date : 2021-04-05 , DOI: 10.1002/ett.4262
Ramachandra Reddy Konda ₁ , Narmadha Thirunavvukkarasu Velayudham ₂ , Ramesh Venkatesan PG ₃

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A single-channel high information rate free-space optics transmission link is presented incorporating in-phase quadrature modulator-based polarization multiplexed-256-quadarature amplitude modulation scheme. An information rate of 160 Gbit/s with 10 Gbaud symbol rate is achieved for free-space information transmission. Advanced digital signal processing techniques at the receiver along coherent detection have been used to compensate the losses incurred by the information signal propagating the free-space media. The transmission performance of the proposed link has been enhanced by using different optical amplifiers, that is, Erbium-doped fiber amplifier and semiconductor optical amplifier, and their performance has been compared. The link performance is analyzed for required laser line width, launch power requirements, increasing transmission range, increasing beam divergence angle and optical power required at the receiver. Bit error rate and error vector magnitude metrics have been used to analyze the link performance. A maximum transmission of 3.9 km for clear weather atmospheric conditions is achieved. The proposed link has the potential to meet the last-mile access needs and to provide high-bandwidth high-speed information links required for future fifth generation wireless communication and Internet of Things applications.

中文翻译：

使用基于同相正交调制器的偏振复用 256 正交幅度调制的相干自由空间光学传输链路的性能分析

提出了一种单通道高信息速率自由空间光学传输链路，它结合了基于同相正交调制器的偏振复用 256 正交幅度调制方案。对于自由空间信息传输，实现了 160 Gbit/s 的信息速率和 10 Gbaud 符号速率。接收器沿相干检测的先进数字信号处理技术已被用于补偿信息信号在自由空间介质中传播所引起的损失。通过使用不同的光放大器，即掺铒光纤放大器和半导体光放大器，提高了所提出链路的传输性能，并对它们的性能进行了比较。针对所需的激光线宽、发射功率要求、增加传输范围，增加接收器所需的光束发散角和光功率。误码率和错误向量幅度度量已被用于分析链路性能。在晴朗的天气大气条件下，最大传输距离可达 3.9 公里。拟议的链路有可能满足最后一英里的接入需求，并提供未来第五代无线通信和物联网应用所需的高带宽高速信息链路。

更新日期：2021-04-05

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