Free-space optical data transmission using wavelength-division-multiplexing with a dedicated CMOS image sensor for indoor optical wireless LAN

AbstractFree-space optical (FSO) communication is a wireless optical data transmission technology with a high data transmission rate. It has received much attention in recent years as it is cost-effective and has license free operation. It is line of sight free-space communication technique where optical signal severely degraded from atmospheric losses especially due to weather conditions; hence it restricts the link range and data carrying capacity. Therefore, a 16-channel ultra-dense wavelength division multiplexing–free space optics (UWDM–FSO) system each having each 10 Gb/s data rate is proposed to enhance the capacity and performance of FSO system. To authenticate the performance of the proposed system, investigation for different modulation formats such as nonreturn to zero (NRZ), return to zero (RZ), carrier suppressed return to zero (CSRZ) and duo binary (DB) are reported. Further, to reduce the atmospheric interference, multiple input multiple output (MIMO) technique is integrated into the proposed system. The outcomes of MIMO–UWDM–FSO link revealed a significant improvement in the bit error rate (BER), eye diagram and Q-factor, under different weather conditions. It is also observed that NRZ modulation formats perform better than RZ, CSRZ and DB formats.

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Erbium/Ytterbium-Doped Waveguide Amplifier (EYDWA) for extended reach of Wavelength Division Multiplexing based free space optics system (WDM/FSO)

Journal of Optical Communications ◽

10.1515/joc-2019-0274 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Bentahar Attaouia ◽

Kandouci Malika ◽

Ghouali Samir

Keyword(s):

Wavelength Division Multiplexing ◽

Free Space ◽

Cost Effective ◽

Weather Conditions ◽

Free Space Optical ◽

Wavelength Division ◽

Space Optics ◽

Effective Implementation ◽

Transmission Distance ◽

The Cost

AbstractThis work is focused to carry out the investigation of wavelength division multiplexing (WDM) approach on free space optical (FSO) transmission systems using Erbium Ytterbium Doped Waveguide Amplifier (EYDWA) integrated as post-or pre-amplifier for extending the reach to 30 Km for the cost-effective implementation of FSO system considering weather conditions. Furthermore, the performance of proposed FSO-wavelength division multiplexing (WDM) system is also evaluated on the effect of varying the FSO range and results are reported in terms of Q factor, BER, and eye diagrams. It has been found that, under clear rain the post-amplification was performed and was able to reach transmission distance over 27 Km, whereas, the FSO distance has been limited at 19.5 Km by using pre-amplification.

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Performance analysis of WDM free space optics transmission system using MIMO technique under various atmospheric conditions

Journal of Optical Communications ◽

10.1515/joc-2021-0038 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Kavitha Thandapani ◽

Maheswaran Gopalswamy ◽

Sravani Jagarlamudi ◽

Naveen Babu Sriram

Keyword(s):

Wavelength Division Multiplexing ◽

Free Space ◽

Multiple Input Multiple Output ◽

Atmospheric Conditions ◽

Free Space Optical ◽

Wavelength Division ◽

Space Optics ◽

Space Optical Communication ◽

Input Multiple Output ◽

And Performance

Abstract Free Space Optical (FSO) communication has evolved as a feasible technique for wireless implementations which offers higher bandwidth capacities over various wavelengths and refers to the transmission of modulated visible beams through atmosphere in order to communicate. Wavelength Division Multiplexing (WDM) is a technology that multiplexes numerous carrier signals onto single fiber using nonidentical wavelengths and enables the efficiency of bandwidth and expanded data rate. Multiple Input Multiple Output (MIMO) is implemented to improve the quality and performance of free space optical communication in various atmospheric conditions. In this paper, a WDM-based FSO communication system is being implemented that benefits from MIMO which receives multiple copies of the signal at receiver that are independent and analyzed for various streams of data in MIMO i.e. 2 × 2, 4 × 4, 8 × 8. Various factors like BER, Quality Factor are analyzed for the WDM-based FSO communication with MIMO using the OptiSystem for various data streams of MIMO under different atmospheric conditions.

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Analog ghost hidden in 2D random binary patterns for free-space optical data transmission

Optics and Lasers in Engineering ◽

10.1016/j.optlaseng.2021.106880 ◽

2022 ◽

Vol 150 ◽

pp. 106880

Author(s):

Yin Xiao ◽

Lina Zhou ◽

Zilan Pan ◽

Yonggui Cao ◽

Mo Yang ◽

...

Keyword(s):

Data Transmission ◽

Free Space ◽

Optical Data ◽

Free Space Optical

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Hybrid WDM free space optical system using CSRZ and Rayleigh backscattering noise mitigation

Journal of Optical Communications ◽

10.1515/joc-2021-0203 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Rupinder Kaur ◽

Charanjit Singh ◽

Rajbir Kaur

Keyword(s):

Wavelength Division Multiplexing ◽

Free Space ◽

Free Space Optical ◽

Power Budget ◽

Noise Mitigation ◽

Wavelength Division ◽

Rayleigh Backscattering ◽

Beat Noise ◽

Optical Line ◽

Insertion Losses

Abstract Hybrid wavelength-division-multiplexing (WDM) and free space optical (FSO) access networks are getting great attention due to numerous advantages. In this work, hybrid WDM-FSO system is demonstrated for 55 km at capacity of 5 × 10 Gbit/s using compressed spectrum return to zero (CSRZ) WDM-FSO in downstream and nonreturn to zero (NRZ) in upstream for demonstrating transmitter diversity which inturn decrease the interchannel interference. For the suppression of Rayleigh backscattering (RB) interferometric beat noise, bidirectional cyclic multiplexer is employed. Cyclic multiplexer provide λ 1 to λ 5 wavelengths for optical line terminal (OLT) to ONU transmission and λ 2 to λ 6 for ONU to OLT transmission. Insertion losses of each component are considered and in the end, power budget is also calculated. Results revealed that FSO length of 780–1050 m are obtained using various WDM-FSO downstream signals and their power budget, redundant budget, maximum distance, and insertion losses also calculated.

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Bidirectional Hybrid Optical Communication System Based on Wavelength Division Multiplexing for Outdoor Applications

10.21203/rs.3.rs-427859/v1 ◽

2021 ◽

Author(s):

Sinan M. Abdulsatar ◽

Mohammed A. Saleh ◽

Abadulla Abass ◽

M. H. Ali ◽

Mohammed Ali Yaseen

Keyword(s):

Wavelength Division Multiplexing ◽

Optical Communication ◽

Data Transmission ◽

Communication System ◽

Optical Switch ◽

Heavy Rain ◽

Free Space Optical ◽

Wavelength Division ◽

Backup System ◽

All Optical

Abstract The simulation and investigation of a 32×10 Gb/s WDM all–optical bidirectional hybrid communication system for outdoor applications is presented in this article via multidisciplinary softwares. In order to track the system condition, a strain sensor based on fiber Bragg grating (FBG) is integrated in–line with the fiber optic link (FO–link). Then, a free space optical link (FSO–link) with 4–channel is simulated to act backup or rescue to the FO–link in the event of disaster or bombing. The FO–link is working well until the strain reach to 180 µε, after that the FO–link has degraded. Therefore, an optical switch is incorporated in between these systems (FO–link & FSO–link) to turn–on the FSO–link which act as a backup system to FO–link and maintains the continuity of the data transmission. According to the hybrid link results, there is an efficient enhancement in the Q–factor as compared with the FO–link even when there is heavy rain.

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