Four-fold increase in users of time-wavelength division multiplexing (TWDM) passive optical network (PON) by delayed optical amplitude modulation (AM) upstream

Kachhatiya, Vivek; Prince, Shanthi

doi:10.1016/j.yofte.2016.09.013

Cited by 25 publications

(12 citation statements)

References 21 publications

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“…An OFDM modulator provides the in-phase (I) as well as quadrature (Q) components of the incoming signal for the data transmission in I/Q optical modulator and to filtered by two low pass cosine roll-off filters (roll-off factor=0.2) to forward for signal modulation. The I/Q optical modulator consists a laser signal, two electrical gain components, two mach-Zehnder modulators (MZMs) (extinction ratio=60 dB) followed by an optical power combiner (size=2×1) (Kachhatiya and Prince 2016). Further, four downstream OFDM signals are multiplexed at disctinct wavelelengths for transmission over an optical fiber.…”

Section: System Architecturementioning

confidence: 99%

Performance analysis of symmetrical and bidirectional 40 Gbps TWDM-PON employing m-QAM-OFDM modulation with multi-color LDs based VLC system

2021

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In this work, a full-duplex time and wavelength division multiplexing-passive optical network (TWDM-PON) system is analysed. Orthogonal frequency division multiplexing (OFDM) with m-quadrature amplitude modulation (m-QAM) is employed to improve the performance of TWDM-PON for downstream and upstream transmission. Simultaneously, multi-color (390-750 nm) laser diodes (LDs) are employed for visible light communication (VLC) using various VLC links to encourage the information rate of fiber/VLC optical network. A TWDM-PON utilizing 16-, 32-and 64-QAM OFDM with ten LDs based VLC system has been analysed for full-duplex multi-color VLC signals of the system. The impact of the LDs input current and high transmission rate in the proposed PON/VLC link has been investigated for m-QAM OFDM modulation. The results show that the 40/40 Gbps 16-, 32-and 64-QAM signals over ten 8000 m VLC links and a 50 km fiber link are successfully transmitted at the modulation input current of 9 mA under bit error rate (BER) of 3.8×10 -3 .Also, the proposed system employing 16-, 32-and 64-QAM signals over a 10 km fiber and ten 10 m VLC links provide the maximum transmission rate of 120, 100 and 80 Gbps respectively. Moreover, the measured error vector magnitudes (EVMs) and calculated BER values for 16-QAM downstream and upstream signals, are well below the required FEC limit than high-order modulation formats. Further, the numerical analysis of the proposed system reveals the superiority of the proposed fiber/VLC links.

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Section: System Architecturementioning

confidence: 99%

Performance analysis of symmetrical and bidirectional 40 Gbps TWDM-PON employing m-QAM-OFDM modulation with multi-color LDs based VLC system

2021

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“…In each transmitter, a spatial CW laser lead by a pseudo-random bit sequence generator to generate a 10 Gbps TWDM information signal using the NRZ line coding technique and a Mach-Zehnder modulator. 9,59 The input power of 10 dBm from each spatial laser is emitted in the form of LG beams. For downstream transmission, all four combined spatial modulated using a power combiner and fed into two input spatial matching components, that is, a spatial connector followed by a spatial aperture.…”

Section: Concept and System Architecture Of Bidirectional Mdm-based Hmentioning

confidence: 99%

“…These fascinating components offer low attenuation and high-speed over the fiber-FSO link distances. 9,10 Furthermore, the information signals from a parabolic-index multimode fiber (PIMMF) and an FSO link is fed to the output spatial aperture followed by a spatial connector and their parameters are imitated as identical as input spatial components to assure the phase matching.…”

Section: Concept and System Architecture Of Bidirectional Mdm-based Hmentioning

confidence: 99%

“…BER analyzer is used to analyse the performance of the proposed system in form of quality factor (Q Factor), BER, eye diagrams, and eye height. 9,13 Similarly, the upstream 10 Gbps TWDM-FSO LG modes traffic sent from the ONUs or RN and detected at OLT/CO side. For upstream transmission, each modal wavelength uses two cascaded dynamic Y selectors to transmit the data at certain and different switching times.…”

Section: F I G U R E 3 Excited Four Lg Modesmentioning

confidence: 99%

“…7 However, PON, a fiber access network may not be an adequate selection in certain regions where the fiber installations are costly because of the territorial restrictions. [8][9][10] Thus, to provide broadband capacity and a cost-effective last-mile network to all end-users, the emerging PON and optical wireless systems would be the favorable systems for high-speed information transmission. 11 Here, the most beneficial, free-space optics (FSO) technology can be effectively employed and combined with the PON to fix this issue.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance analysis of long‐reach 40/40 Gbps mode division multiplexing‐based hybrid time and wavelength division multiplexing passive optical network/free‐space optics using Gamma‐Gamma fading model with pointing error under different weather conditions

Kumari

Sharma

Sheetal

2021

Trans Emerging Tel Tech

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Time and wavelength division multiplexing passive optical network (TWDM-PON) is adopted across the globe and is considered as the most remarkable trend of the next-generation solution to serve exponential traffic growth for fifth-generation (5G) network. In the interest of achieving 5G network requirements, we propose a mode division multiplexing (MDM) based bidirectional 40/40 Gbps hybrid TWDM-PON and free-space optics (FSO) system. The system performance is analyzed for bidirectional hybrid fiber/FSO channels incorporating four distinct Laguerre-Gaussian (LG00, LG01, LG11, and LG21) spatial modes for variable fiber (10-155 km)/FSO (10-1000 m) link ranges and different receiver aperture diameters (20 μm-60 cm). Based on Gamma-Gamma (GG) modeled FSO channels using Laguerre Gaussian modes, bit error rate (BER) performance of the system is numerically investigated under the impact of dynamic atmospheric weather conditions, weak-to-strong turbulence conditions, pointing errors, and geometric loss (GL) at an acceptable BER of 10 −9. In addition, to support the numerical analysis, the simulation results exhibit that the hybrid fiber/FSO LG00 signals over 1000 m FSO and 155 km fiber link ranges are successfully transmitted in the system with 40 μm spatial and 60 cm FSO receiver aperture diameters under the impact of strong turbulence, atmospheric attenuation of 0.2 dB/km and noise. Moreover, the performance comparison of the MDM-based hybrid TWDM-PON/FSO with the previous latest literature works reveals a superior system performance under practical environment conditions. The proposed work can be utilized to realize longreach, bandwidth-efficient, high-capacity, and high-speed data transmission links.

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Design and investigation of hybrid PON‐FSO system employing modified NZCC code under distinct weather conditions

Kumari

Narayan

Arya

2022

Trans Emerging Tel Tech

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In this paper, a hybrid time and wavelength division multiplexing passive optical network (TWDM‐PON) and wavelength division multiplexing optical code division multiple access (WDM‐OCDMA) with free space optics (FSO) for bidirectional 160/40 Gbps transmission has been proposed. Also, to offer the information to 64 users over 60 km fiber and 600 m FSO channels under diverse climate conditions have been presented. Also, to resist the fiber impairments, interference, noise and losses under the effect of unfavorable climate conditions in hybrid fiber‐FSO link, a modified new zero‐cross correlation (NZCC) code is effectively used in the system to enhance the system ability to access shared bandwidth with users' security. The performance of the designed PON system has been analysed and investigated for diverse FSO (10–600 m) and fiber distance (0–60 km) under distinct climate conditions. Based on mathematical and simulation analysis, the designed system using modified NZCC code is shown to provide better performance than other OCDMA codes. The designed system with hybrid fiber‐FSO link improves the performance of the system in terms of high received optical power of 3 dBm and support 110 users simultaneously at acceptable BER of 10−9, under fiber impairments, climate conditions and turbulences. Additionally, on comparing the designed system's performance with the prior latest work in literature reveals its superiority than others in codes and system design.

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Four-fold increase in users of time-wavelength division multiplexing (TWDM) passive optical network (PON) by delayed optical amplitude modulation (AM) upstream

Cited by 25 publications

References 21 publications

Performance analysis of symmetrical and bidirectional 40 Gbps TWDM-PON employing m-QAM-OFDM modulation with multi-color LDs based VLC system

Performance analysis of symmetrical and bidirectional 40 Gbps TWDM-PON employing m-QAM-OFDM modulation with multi-color LDs based VLC system

Performance analysis of long‐reach 40/40 Gbps mode division multiplexing‐based hybrid time and wavelength division multiplexing passive optical network/free‐space optics using Gamma‐Gamma fading model with pointing error under different weather conditions

Design and investigation of hybrid PON‐FSO system employing modified NZCC code under distinct weather conditions

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