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Improved transmission length in the presences of ambient noise and scintillation effect using duobinary modulation in 40 Gbps free space optical channel
Author(s) -
Manzoor Habib Ullah,
Manzoor Sanaullah,
Manzoor Tareq,
Khan Talha,
Hussain Ashiq
Publication year - 2020
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32441
Subject(s) - scintillation , pulse position modulation , transmission (telecommunications) , modulation (music) , electronic engineering , bit error rate , on off keying , keying , noise (video) , computer science , free space optical communication , bandwidth (computing) , optics , optical communication , physics , telecommunications , channel (broadcasting) , quadrature amplitude modulation , pulse amplitude modulation , engineering , acoustics , detector , pulse (music) , artificial intelligence , image (mathematics)
Free space optical (FSO) communication has gained significant popularity in recent years due to large bandwidth, license‐free spectrum, high data rates, less power consumption, and low mass requirements. However, system performance strongly depends on atmospheric conditions and ambient noise. In this letter, the duobinary modulation technique is applied and the system performance is investigated in the presence of ambient noise. The system is evaluated on the basis of Q‐factor, eye diagram, input power, transmission distance, and bit error rate. A significant improvement is observed in the presence of noise while using duobinary modulation. This study exploits extensive simulations to investigate the performance of the system. All simulations are performed for a single link of FSO communication network having a data rate of 40 Gbps in the Optisystem simulator and ambient noise is created using LEDs. After the exhaustive set of simulations, a significant improvement in transmission length is observed. It is also observed that at low input power, doubinary modulation provides better results when compared with on‐off keying (OOK) format. Scintillation effect has also be observed for doubinary modulation and compared with OOK modulation format. It is concluded that doubinary modulation provides better results in the presence of low and moderate scintillation.