A full-duplex optical fiber/wireless coherent communication system with digital signal processing at the receiver

Kakati, Dhiman; Arya, Subhash C.

doi:10.1016/j.ijleo.2018.05.140

Cited by 26 publications

(17 citation statements)

References 22 publications

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“…Different research works have been published in the recent past suggesting various strategies in the direction of capacity enhancement in FSO links [9]. While Kakati et al in their research work, see [30]- [31] have used DP-16 QAM to support high data rate transmission, authors in, see [32]- [37] advocate use of wavelength division multiplexing as a more practical approach in achieving transmission rates as high as 1 Tbps. Malik et al and Grover et al in their reported research, see [34] and [35] respectively, proposed a long haul FSO link wherein the transmission powers is 40 dBm while link attenuation is as low as 0.065 dB/km.…”

Section: Problem Statementmentioning

confidence: 99%

“…However, in the presence of atmospheric adversities, IM/DD FSO links experience degraded reliability and a sharp reduction in operational range, see [5]. Coherent reception, on the other hand, tracks the frequency and phase attributes of the received signal, thus improving receiver sensitivity and selectivity, see [5], [16], [30]. It is for the same reasons that globally optical fiber networks now prefer coherent receivers over direct detection, see [38]- [39].…”

Section: Modulation Theorymentioning

confidence: 99%

“…DSP unit uses a pre-defined algorithm to minimize channel induced impairment factors like distortions in phase, frequency, timing, and polarization. This assertion is based on motivating results reported in, see [30]- [31] about the success of DSP units in mitigating signal information errors and losses in long haul optical fiber links. The signal processing unit used in the proposed link has been designed to ensure: (i) timing recovery and blocking D.C noise components (ii) adaptive equalization and (iii) carrier frequency and phase estimation for enhanced sensitivity.…”

Section: Modulation Theorymentioning

confidence: 99%

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Multi-Hop Relay Based Free Space Optical Communication Link for Delivering Medical Services in Remote Areas

et al. 2020

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Free Space Optical (FSO) communication links are although extremely vulnerable to atmospheric adversities, multi-hop relay transmission can however, significantly improve the link performance and reliability. This paper proposes 120 Gbps DP-16 QAM modulated multi-hop serial FSO link with coherent reception for delivering medical consultation services in remote and isolated locations. Considering the current situation wherein pandemic of highly infectious nature, COVID-19 has affected millions of people globally; doctors can use the proposed high-speed architecture for "contact-less" supervision of quarantined patients and suspects through video conferencing. Each relay terminal uses an all-optical amplify-and-forward technique with Erbium-doped fiber amplifier (EDFA) and gain optimization as its core elements. As a possible last-mile application for delivering medical/health care services, the proposed link has been evaluated for reliability by exposing the link to varied atmospheric conditions. Our results reveal that at target BER of 10 −5 , the useful communication link range of proposed multi-hop link increments by 1.8 kms as compared to direct link that operates under similar channel conditions. Furthermore, compared to results from recent literature on high-speed FSO [30], the proposed link shows enhancement in link range by approximately 0.7 km. The analysis also reveals that as the number of relay nodes increases, the error performance of the link for different atmospheric conditions approaches a state of convergence.

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Section: Problem Statementmentioning

confidence: 99%

Section: Modulation Theorymentioning

confidence: 99%

Section: Modulation Theorymentioning

confidence: 99%

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Multi-Hop Relay Based Free Space Optical Communication Link for Delivering Medical Services in Remote Areas

et al. 2020

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“…These DSP components consist of various preprocessing and recovery stages aid in recovering the electrical constellations after SMF transmission. A step‐by‐step description of these functions was described in our previous article [28].…”

Section: Design Schematic and Principle Of Operationmentioning

confidence: 99%

Performance of grey‐coded IQM‐based optical modulation formats on high‐speed long‐haul optical communication link

Kakati

Arya

2019

IET Communications

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“…For instance, if a user subscribes to a data bandwidth of 10Gb per month, MNO must ensure this value is been received at the user's end at all times. Unfortunately, this bandwidth (Kakati and Arya, 2018) usually drops or flaps in the course of transmission during specific periods. 10 Gb may be recorded at the wireless gateway, but the handover process usually degrades the quality of the FOB wireless signal, which affects the received signal at the user's premises (Ahmadi, 2011).…”

Section: Fiber Optics Broadband Technologymentioning

confidence: 99%

Investigating QoS and Performance of Received Signal Strength Indicator in Fiber Optics Broadband Data Communication

Nyarko-Boateng¹,

Adekoya²,

Weyori³

2019

American Journal of Engineering and Applied Sciences

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There has been an unusual drop of Fiber Optics Broadband (FOB) internet speed in certain localities in Ghana which severely affect users' experience. This phenomenon have had a serious impact on the quality of service of internet delivery. This paper accessed the quality service of FOB wireless signal between the last mile cell site and the FOB wireless Access Point (AP). The essential components that the paper looked at were accessibility, availability and usability of FOB wireless signal which defines the QoS of a robust internet connection. This paper investigated the quality of FOB wireless signal and how lower antenna gain could affect the received signal strength of the FOB wireless AP. The study adopted three regulatory licensed indicators-Data Access Success Rate, Data Drop Rate and Data Throughput-in measuring accessibility, availability and usability of the received signal strength. A drive-test was conducted in five cities in Ghana where FOB services were available to assess the performance of the FOB wireless signal at peak and off-peak period. It was observed that the strength of the signal reduced significantly during peak hours; this phenomenon severely affected the QoS of the internet. Kalma's filter and other communication techniques were used to analyze the results of the drive-test. The paper also provided conceptual framework which included suggestions and recommendations on how the Mobile Network Operators (MNOs) could adopt new measures to improve and upgrade their communication infrastructure, to ensure users always have the most efficient and quality of internet service delivery through FOB.

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A full-duplex optical fiber/wireless coherent communication system with digital signal processing at the receiver

Cited by 26 publications

References 22 publications

Multi-Hop Relay Based Free Space Optical Communication Link for Delivering Medical Services in Remote Areas

Multi-Hop Relay Based Free Space Optical Communication Link for Delivering Medical Services in Remote Areas

Performance of grey‐coded IQM‐based optical modulation formats on high‐speed long‐haul optical communication link

Investigating QoS and Performance of Received Signal Strength Indicator in Fiber Optics Broadband Data Communication

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