Performance Enhancement of DWDM-FSO Optical Fiber Communication Systems Based on Hybrid Modulation Techniques under Atmospheric Turbulence Channel
نویسندگان
چکیده
In this paper, we enhance the performance efficiency of free-space optical (FSO) communication link using hybrid on-off keying (OOK) modulation, M-ary digital pulse position modulation (M-ary DPPM), and M-pulse amplitude (M-PAPM). This work analyzes enhances bit error rate (BER) moment generating function, modified Chernoff bound, Gaussian approximation techniques. existence both an amplified spontaneous emission (ASE) noise, atmospheric turbulence (AT) channels, interchannel crosstalk (ICC), propose a system model passive network (PON) wavelength division multiplexing (WDM) technique for dense WDM (DWDM) based on fiber FSO (HFFSO) link. We use eight channels that have been transmitted at data 2.5 Gbps over turbulent HFFSO-DWDM PON-FSO start from 1550 nm channel spacing in C-band 100 GHz. The results demonstrate (2.5 × 8 channels) 20 Gbit/s-4000 m transmission with favorable performance. design, DPPM-M-PAPM is used to provide extra information bits increase also incorporate adaptive optics mitigate AT effect improve efficiency. investigate impact proposed OOK-M-ary PAPM-DPPM as function DPPM-PAPM other parameters. solution increases receiver sensitivity compared OOK, improves reliability achieves lower power penalty 0.2–3.0 dB low coding level (M) 2 WDM-FSO systems weak turbulence. OOK/M-ary provides signal-to-noise ratio about 4–8 DWDM-HFFSO strong target BER 10−12. numerical indicate design can be enhanced OOK/M-DPPM M-PAPM systems. calculation show has increased 10–11 10−12 more than OOK-NRZ approach. simulation DWDM-FSO links optical-wireless fiber-optic systems, significantly increasing their Finally, schemes new reduce AT, ICC, ASE noise
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ژورنال
عنوان ژورنال: Photonics
سال: 2021
ISSN: ['2304-6732']
DOI: https://doi.org/10.3390/photonics8110464