A high power 320 Gbps CPDM-256-QAM based Ro-FSO system enabling 80 GHz under rain and haze effects

Ghatwal, Shakshi; Saini, Himanshi

doi:10.1007/s11082-022-04364-6

Cited by 6 publications

References 42 publications

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An orbital angular momentum assisted extended reach CPDM-Ro-FSO system under diverse weather instabilities

Ghatwal,

Saini

2024

J. Opt.

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An orbital angular momentum (OAM)-assisted 640 Gbps circular polarization division multiplexing (CPDM) based extended reach radio over free space optical (Ro-FSO) system is presented in this research paper. For the data modulation, a highly spectrum efficient 256-quadrature amplitude modulation (256-QAM) is employed and proposed system is investigated in the presence of diverse weather instabilities such as clear weather, haze, and rain. CPDM is a highly advanced method that dominates linear PDM (LPDM) since it does not need polarization axis alignment and scattering light is distributed uniformly. For the implementation of OAM, the same wavelength channel has been assigned Laguerre-Gaussian (LG) modes such as LG0,0 and LG13,0, respectively. The detailed performance comparisons of OAM beams and right/left circular polarization states (R/L CPS) are conducted at varied Ro-FSO link lengths using digital signal processing (DSP)-enabled receivers in terms of quality factor (Q-factor) and bit error rate (BER). The proposed system is competent to cover a 45 km distance under clear weather carrying an 80 GHz RF signal, 10 km under haze, and 4 km under the rain with the highest Q factor for all weathers at LG0,0 right circular polarization state (RCPS). Further, a mathematical modelling of the proposed system is presented, and pointing errors are investigated in Optisystem version 20. Results revealed that higher symbol error rates (SERs) can be discernible at higher misalignments between the FSO transmitter and receiver. After doing the comprehensive literature survey, it is observed that the presented system has covered the maximum distance at 640 Gbps capacity using OAM and CPDM.

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An orbital angular momentum assisted extended reach CPDM-Ro-FSO system under diverse weather instabilities

Ghatwal,

Saini

2024

J. Opt.

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Comparative analysis of techniques in long reach passive optical networks: overview and design

Sachdeva,

Shukla,

Sindhwani

et al. 2023

Journal of Optical Communications

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Long reach PON is an attractive option for addressing the growing bandwidth needs of internet applications and also serving multiple ONUs. Due to newly augmented technologies such as 4K/8K television, video meetings/conferencing, and online gaming, end-user bandwidth demands are exponentially rising day by day. Wavelength division multiplexing–based passive optical network (WDM-PON), which can deliver high data rates over long distances, is the ultimate solution to the growing bandwidth demand. It is possible to reduce the number of active cabinets and central offices while increasing the number of optical network units (ONUs) with the use of passive optical networks (PONs). At higher bit rates, researchers faced lot of issues like increased pulse width due to increased distance, burst loss, fault detection, etc. In this paper, we have discussed few challenges faced in passive optical networks. Also, we have discussed about the methodology to overcome these issues.

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Hybrid RoF-RoFSO system for broadband services by incorporating polarization division multiplexing scheme

Sharma,

Mishra,

Singh

et al. 2023

Journal of Optical Communications

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The limited bandwidth of traditional wireless carriers presents a challenge for delivering high-speed broadband services. To address this, radio-over-free space optics (Ro-FSO) emerges as a viable solution, seamlessly integrating wireless and optical systems. This integration is particularly valuable in sensitive environments such as hospitals, where electromagnetic interference can disrupt medical equipment. Ro-FSO provides interference-free high-speed data transmission, making it an ideal choice for broadband services, including WLANs. This study presents a high-speed Ro-FSO link capable of simultaneously transmitting two independent channels, each carrying 1 Gbps data up-converted to the 2.4 GHz and 5 GHz RF bands over a 5 km SMF and 4200 m FSO channel. The incorporation of polarization division multiplexing enhances the spectral efficiency of the Ro-FSO link. Our findings demonstrate the successful transmission of both channels meeting the required bit error rate (BER) and eye pattern criteria.

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A high power 320 Gbps CPDM-256-QAM based Ro-FSO system enabling 80 GHz under rain and haze effects

Cited by 6 publications

References 42 publications

An orbital angular momentum assisted extended reach CPDM-Ro-FSO system under diverse weather instabilities

An orbital angular momentum assisted extended reach CPDM-Ro-FSO system under diverse weather instabilities

Comparative analysis of techniques in long reach passive optical networks: overview and design

Hybrid RoF-RoFSO system for broadband services by incorporating polarization division multiplexing scheme

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