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Performance evaluation of free space optical link by incorporating the device parameters of quantum cascade laser based transmitter
Laser Physics Letters ( IF 1.7 ) Pub Date : 2021-02-06 , DOI: 10.1088/1612-202x/abdcbc
P Ashok 1 , M Ganesh Madhan 2 , N A Natraj 3
Affiliation  

This article investigates the performance of a free space optical (FSO) communication link by incorporating the device parameters that influence the optical output power of the quantum cascade laser (QCL). The transmitter side of the FSO link consists of gain-switched QCL operating at 9 m. Short optical pulses possessing minimum full width half maximum (FWHM) and peak power as a result of ON-OFF keying are transmitted into the channel. The pulses are attenuated by medium bound losses and reach the receiver which employs quantum well infrared photodetector operating in the same wavelength. Average signal-to-noise ratio (SNRavg), bit error rate (BER) and Channel Capacity are computed for the FSO link for all the variations in the device parameters namely optical confinement factor (Γ), spontaneous emission factor (β) and mirror reflectivity (R). The combination of device parameters that gives the best link performance is assessed. From the analysis it is observed that, under minimum FWHM condition, QCL with Γ = 0.32 provides the best average SNR of 4.04 dB, lowest BER of 13.02 10−2 and maximum capacity of 1.82 bps Hz−1. When peak power is the constraint, QCL with mirror reflectivity of Γ = 0.45 provides the best average SNR of 24.78 dB, lowest BER of 7.75 10−35 and a peak capacity of 8.24 bps Hz−1.



中文翻译:

通过结合基于量子级联激光器的发射器的设备参数来评估自由空间光链路的性能

本文通过结合影响量子级联激光器(QCL)的光输出功率的设备参数,研究了自由空间光(FSO)通信链路的性能。FSO链路的发射器端包括工作在9的增益切换QCL米 具有最小全宽一半最大值(FWHM)和由于ON-OFF键控而产生的峰值功率的短光脉冲被传输到通道中。脉冲由于介质限制损耗而衰减,并到达接收器,该接收器使用在相同波长下工作的量子阱红外光电探测器。针对设备参数(即光学限制因子(Γ),自发发射因子(β)和自发发射因子)的所有变化,为FSO链路计算了平均信噪比(SNR avg),误码率(BER)和信道容量。镜面反射率(R)。评估提供最佳链路性能的设备参数组合。从分析中可以看出,在最小FWHM条件下,Γ= 0.32的QCL的最佳平均SNR为4.04 dB,最低BER为13.02 10 -2,最大容量为1.82 bps Hz -1。当限制峰值功率时,镜面反射率为Γ= 0.45的QCL的最佳平均SNR为24.78 dB,最低BER为7.75 10 -35,峰值容量为8.24 bps Hz -1

更新日期:2021-02-06
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