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Performance enhancement of the power penalty in DWDM FSO communication using DPPM and OOK modulation

机译：使用DPPM和OOK调制的DWDM FSO通信中功率损失的性能增强

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摘要

This paper presents the design and performance enhancement of the power penalty (PP) in a dense wavelength division multiplexing based on free space optical communication (FSOC) link using digital pulse position modulation (DPPM) and on-off keying (OOK) modulation. Such a system has a high performance, low cost, robust and power efficient, reliable, excessive flexibility, and higher data rate for access networks. The system performance is evaluated for an 8-channel wavelength-division-multiplexing for hybrid fiber FSOC system at 2.5 Gbps on widely accepted modulation schemes under various atmospheric turbulence (AT) regimes conditions. The performance of system is introduced in terms of PP, bit-error rate (BER), transmission distance and the average received optical power. The numerical results shows that the improvement of the PP using DPPM modulation of 0.2-3.0 dB for weak turbulence (WT) regimes for BER of 10(-6) and above 20, 25 dB for strong turbulence (ST) regimes are reported for BER of 10(-6) and 10(-9), as respectively (depending on the AT level). Further, we develop of improvement the PP caused by multiple-access interference about 6.686 dB which is predicted for target BER of 10(-9) in WT and 1 dB at target BER of 10(-6) in ST when the 8 user are active on the system of optical network units. Additionally, the optical power budget and margin losses of a system are calculated with different link length. The proposed approach of DPPM merges superiority with higher enhancement of PP about 0.8 dB for BER equal 10(-9) at FSO link length l (fso) = 2000 m compared to OOK at 1 dB for WT. An improvement of 2 dB is observed using the DPPM scheme over an OOK due to capability of detect pulses under background noise conditions with increased receiver sensitivity.
机译：本文介绍了使用数字脉冲位置调制（DPPM）和开关键控（OOK）调制的基于自由空间光通信（FSOC）链路的密集波分复用中功率损失（PP）的设计和性能增强。这样的系统对于接入网络具有高性能，低成本，鲁棒性和功率效率，可靠，过度的灵活性以及更高的数据速率。在各种大气湍流（AT）体制条件下，在广泛接受的调制方案下，以2.5 Gbps的速度对混合光纤FSOC系统的8通道波分复用进行系统性能评估。从PP，误码率（BER），传输距离和平均接收光功率方面介绍了系统的性能。数值结果表明，对于BER为10（-6）的弱湍流（WT）方案，使用0.2-3.0 dB的DPPM调制对PP的改进已得到报道，对于BER，对于强湍流（ST）方案，PP的改进为20、25 dB以上分别为10（-6）和10（-9）（取决于AT级别）。此外，我们开发了改进的多址干扰引起的PP，该多址干扰约为6.686 dB，当有8个用户时，预计在WT中目标BER为10（-9），在ST中目标BER为10（-6）为1 dB活跃在光网络单元系统上。此外，系统的光功率预算和裕量损耗是通过不同的链路长度来计算的。对于FSO链路长度l（fso）= 2000 m的BER等于10（-9），与WT的1OK的OOK相比，DPPM的提议​​方法融合了PP的更高优势，即PP的增强更高，约为0.8 dB。使用DPPM方案在OOK上观察到2 dB的改善，这是由于在背景噪声条件下具有提高接收器灵敏度的情况下检测脉冲的能力。

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