太赫兹偏振保持亚波长波导链路功率预算分析

Power budget analysis of terahertz polarization-maintaining subwavelength waveguide links

摘要:

为了探究太赫兹偏振保持波导在太赫兹通信系统链路中对传输信号的影响,本工作提出波导链路功率预算模型,研究了偏振保持亚波长介质波导的性能参数(长度、损耗、色散和双折射)对太赫兹幅移键控(amplitude shift keying,ASK)调制系统通信性能的影响,计算了不同发射功率、波导长度、调制信号特征时间宽度、调制信号周期时,两个正交偏振态信号的接收功率、信号与干扰加噪声比(signal-to-interference-plus-noise ratio,SINR)和相干、非相干解调误码率(bit error rate,BER)。研究结果显示,通过合理设计波导结构,该系统可实现高速(3.33 Gbit/s)、低BRE(低于前向纠错极限10-3)通信。本工作揭示了太赫兹亚波长波导长度、损耗、群速度色散(group velocity disper- sion,GVD)和双折射对通信性能的影响机制,对研发基于太赫兹波导链路的宽带通信系统具有积极意义。

Abstract:

In order to investigate the influence of terahertz polarization-maintaining waveguides on the transmission signal of the terahertz communication systems,we propose the power budget model of waveguide links.The effects of the parameters (length,loss,dispersion,and birefringence) of polarization-maintaining subwavelength dielectric waveguides on the communication performance of amplitude shift keying (ASK) modulation systems are investigated.We calculate the received power,signal-to-interference-plus-noise ratio (SINR),coherence and incoherent demodulation bit error rate (BER) of two orthogonal polarization state signals for different transmitting power,waveguide lengths,modulated signal characteristic time widths,and modulated signal periods.The results show that the communication system can achieve high-speed (3.33 Gbit/s) and low BER (less than forward error correction limitation,10-3) by designing the waveguide structure.This work reveals the influence of length,loss,group velocity dispersion (GVD) and birefringence of terahertz subwavelength waveguides on communication performance,which has positive significance for the development of broadband communication systems based on terahertz waveguide links.