scholarly journals A 5G C-RAN Optical Fronthaul Architecture for Hotspot Areas Using OFDM-Based Analog IFoF Waveforms

2019 ◽  
Vol 9 (19) ◽  
pp. 4059 ◽  
Author(s):  
Charoula Mitsolidou ◽  
Christos Vagionas ◽  
Agapi Mesodiakaki ◽  
Pavlos Maniotis ◽  
George Kalfas ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Integrated Circuit ◽  
Orthogonal Frequency Division Multiplexing ◽  
Access Network ◽  
Intermediate Frequency ◽  
Error Vector Magnitude ◽  
Photonic Integrated Circuit ◽  
Wavelength Division ◽  
High Data ◽  
Radio Access

Analog fronthauling is currently promoted as a bandwidth and energy-efficient solution that can meet the requirements of the Fifth Generation (5G) vision for low latency, high data rates and energy efficiency. In this paper, we propose an analog optical fronthaul 5G architecture, fully aligned with the emerging Centralized-Radio Access Network (C-RAN) concept. The proposed architecture exploits the wavelength division multiplexing (WDM) technique and multicarrier intermediate-frequency-over-fiber (IFoF) signal generation per wavelength in order to satisfy the demanding needs of hotspot areas. Particularly, the fronthaul link employs photonic integrated circuit (PIC)-based WDM optical transmitters (Txs) at the baseband unit (BBU), while novel reconfigurable optical add-drop multiplexers (ROADMs) cascaded in an optical bus are used at the remote radio head (RRH) site, to facilitate reconfigurable wavelength switching functionalities up to 4 wavelengths. An aggregate capacity of 96 Gb/s has been reported by exploiting two WDM links carrying multi-IF band orthogonal frequency division multiplexing (OFDM) signals at a baud rate of 0.5 Gbd with sub-carrier (SC) modulation of 64-QAM. All signals exhibited error vector magnitude (EVM) values within the acceptable 3rd Generation Partnership Project (3GPP) limits of 8%. The longest reach to place the BBU away from the hotspot was also investigated, revealing acceptable EVM performance for fiber lengths up to 4.8 km.

scholarly journals HIGH DATA RATE WDM SYSTEMS-BASED GRAPHENE CARRIERS

2020 ◽  
Vol 15 (11) ◽  
Author(s):  
Saib Thiab Alwan
Keyword(s):  
Wavelength Division Multiplexing ◽  
Data Rate ◽  
High Data Rate ◽  
Optical Channel ◽  
Phase Shift Keying ◽  
Error Vector Magnitude ◽  
Wavelength Division ◽  
High Data ◽  
Shift Keying ◽  
Vector Magnitude

In this paper, carrier’s generation-based graphene with applicability for wavelength division multiplexing (WDM) systems have been produced via an illumination of graphene by 980 nm. This technique allowed for servicing of a greater number of channels in a WDM system, and the carriers were able to travel in an optical channel with high data rate. Eight carriers, having a frequency spacing (FS) of 25 GHz and full-width at half-maximum (FWHM) of 500 MHz, were created. These generated carriers were separately modulated with eight optical quadrature phase shift keying (QPSK) signals and subsequently optically multiplexed and transmitted to an optical fiber channel. At the receiver side, the received signal was demultiplexed, and the performance of the system was analyzed via calculating the error vector magnitude and constellation diagram of the entire system. Opti System version 17.1 and Matlab software are used for demonstration of WDM system and carrier generation.

Mobility aware of WDM-based CMO OFDM communication system

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Saad M. Hardan ◽  
Ayad A. Abdulkafi ◽  
Saadi Hamad Thalij ◽  
Sherine S. Jumaah
Keyword(s):  
Wavelength Division Multiplexing ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Light Emitting Diode ◽  
Access Point ◽  
Mobile Users ◽  
Visible Light Communications ◽  
Optical Wireless Communications ◽  
High Data ◽  
The Impact

Abstract The continued increase in several mobile applications forces to replace existing limited spectrum indoor radio frequency wireless connections with high-speed ones. Visible light communications (VLC) technology has gained prominence in the development of high data rate transmission for fifth-generation networks. In optical wireless communications, light-emitting diode (LED) transmitters are used in applications that desire mobility as LED divergence enables larger coverage. Since each VLC access point covers a small area, handovers of mobile users are inevitable. Wavelength division multiplexing (WDM) can be used in VLC systems to tackle the above issue and to meet the increasing demand for indoor connectivity with high bit rates. In this paper, a new system architecture for WDM with coded modulated optical in orthogonal frequency division multiplexing (OFDM) VLC system in conjunction with red, green, blue, and yellow (RGBY) LEDs is proposed to reduce the impact of random receiver orientation of indoor mobile users over VLC downlink channels and improves the system’s bit-error-rate (BER) performance. Simulation results show that the proposed method is not affected by the user’s mobility and hence it performs better than other approaches, in terms of BER for all scenarios and at all positions. This study reveals that using WDM-OFDM-VLC with RGBY LEDs to construct a VLC system is very promising.

To Decrease Maintenance Issues using FWM in Ultradense WDM Systems and Enhancing Optimum Placement of Optical Phase Conjugation

2020 ◽  
Vol 41 (4) ◽  
pp. 421-427
Author(s):  
Anu Chauhan ◽  
Arti Vaish ◽  
Ashu Verma
Keyword(s):  
Wavelength Division Multiplexing ◽  
Orthogonal Frequency Division Multiplexing ◽  
Phase Conjugation ◽  
Laser Source ◽  
Frequency Division ◽  
Optical Phase Conjugation ◽  
Optical Phase ◽  
Wavelength Division ◽  
Optimum Placement ◽  
Suppression Method

AbstractIn this work, a maintenance issues resolved suppression method of four-wave mixing (FWM) is proposed using optical phase conjugation (OPC) modules and different placements of OPCs are investigated in ultradense wavelength division multiplexing (WDM) system with coherent orthogonal frequency division multiplexing (OFDM) incorporation. Moreover, comparison of the placements of OPC in six different cases has been done and compared with conventional WDM (no-OPC) system in terms of Q-factor, BER and induced FWM. Analysis has been done at different launched power levels. It is observed that placement of OPC after each laser source performs exceptionally well and suppresses FWM with ease of maintenance.

Comparative Analysis of High Speed 20/20 Gbps OTDM-PON, WDM-PON and TWDM-PON for Long-Reach NG-PON2

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Meet Kumari ◽  
Reecha Sharma ◽  
Anu Sheetal
Keyword(s):  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Optical Network ◽  
Access Network ◽  
Cost Effective ◽  
Input Power ◽  
Passive Optical Network ◽  
Wavelength Division ◽  
Transmission Distance ◽  
Wdm Pon

AbstractNowadays, bandwidth demand is enormously increasing, that causes the existing passive optical network (PON) to become the future optical access network. In this paper, next generation passive optical network 2 (NG-PON2) based, optical time division multiplexing passive optical network (OTDM-PON), wavelength division multiplexing passive optical network (WDM-PON) and time & wavelength division multiplexing passive optical network (TWDM-PON) systems with 20 Gbps (8 × 2.5 Gbps) downstream and 20 Gbps (8 × 2.5 Gbps) upstream capacity for eight optical network units has been proposed. The performance has been compared by varying the input power (−6 to 27 dBm) and transmission distance (10–130 km) in terms of Q-factor and optical received power in the presence of fiber noise and non-linearities. It has been observed that TWDM-PON outperforms OTDM-PON and WDM-PON for high input power and data rate (20/20 Gbps). Also, TWDM-PON shows its superiority for long-reach transmission up to 130 km, which is a cost-effective solution for future NG-PON2 applications.

Review on Wavelength Division Multiplexing Free Space Optics

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
S. Magidi ◽  
A. Jabeena
Keyword(s):  
Wavelength Division Multiplexing ◽  
Free Space ◽  
Access Network ◽  
Research Direction ◽  
Hybrid Network ◽  
Free Space Optics ◽  
Wavelength Division ◽  
Space Optics ◽  
Current State ◽  
Data Rates

AbstractWavelength division multiplexing-based free space optics (WDM FSO) has emerged as a potential communication network candidate for last-mile access among other applications. FSO has received much attention in the last few years as a complement as well as an alternative to radio frequency-based communication due to spectrum crisis among other reasons. On the other hand, WDM has been considered as one of the next-generation optical access network candidates for bandwidth efficiency and increased data rates. A hybrid network of these two technologies thus has emerged as another research direction. In this article, we present the background, progress and the current state of WDM FSO.

scholarly journals A Bidirectional Hybrid WDM-PON with High Data Rate Transmission for Wired and Wireless Users in Long-Reach with Enriched Noise Tolerance Capacity against Rayleigh Backscattering

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Rinki Atta ◽  
◽  
Paulomi Mandal ◽  
Nilanjana Sarkar ◽  
Ardhendu Patra ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Noise Power ◽  
Noise Tolerance ◽  
Noise Mitigation ◽  
Wavelength Division ◽  
Rayleigh Backscattering ◽  
High Data ◽  
Rate Transmission ◽  
Wireless Users ◽  
Data Rate Transmission

Transportation of 10 Gbps, 10 Gbps/40 GHz, 10 Gbps/200 MHz data for downlink (DL) and 6 Gbps data for uplink (UL) transmission with Rayleigh backscattering (RB) noise mitigation for wired and wireless users even in radio-frequency sensitive areas have been proposed and investigated. A 2×2 wavelength-division-multiplexing mux/demux is employed to separate DL and UL to avoid RB noise. Power penalty of < 1 dB at Bit error rate value of 10−9 and clear eye-diagrams express the reliability and fruitfulness of the proposed network.

scholarly journals A Bidirectional Hybrid WDM-PON with High Data Rate Transmission for Wired and Wireless Users in Long-Reach with Enriched Noise Tolerance Capacity against Rayleigh Backscattering

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Rinki Atta ◽  
◽  
Paulomi Mandal ◽  
Nilanjana Sarkar ◽  
Ardhendu Patra ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Noise Power ◽  
Noise Tolerance ◽  
Noise Mitigation ◽  
Wavelength Division ◽  
Rayleigh Backscattering ◽  
High Data ◽  
Rate Transmission ◽  
Wireless Users ◽  
Data Rate Transmission

Transportation of 10 Gbps, 10 Gbps/40 GHz, 10 Gbps/200 MHz data for downlink (DL) and 6 Gbps data for uplink (UL) transmission with Rayleigh backscattering (RB) noise mitigation for wired and wireless users even in radio-frequency sensitive areas have been proposed and investigated. A 2×2 wavelength-division-multiplexing mux/demux is employed to separate DL and UL to avoid RB noise. Power penalty of < 1 dB at Bit error rate value of 10−9 and clear eye-diagrams express the reliability and fruitfulness of the proposed network.

scholarly journals Optimization of system’s parameters for wavelength conversion of E-band signals

2022 ◽  
Vol 12 (2) ◽  
pp. 1659
Author(s):  
Yazan Alkhlefat ◽  
Sevia Mahdaliza Idrus Sutan Nameh ◽  
Farabi M. Iqbal
Keyword(s):  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Wavelength Conversion ◽  
Signal To Noise Ratio ◽  
Optical Amplifier ◽  
Optical Signal ◽  
Error Vector Magnitude ◽  
Wavelength Converter ◽  
High Data

Current and future wireless communication systems are designed to achieve the user’s demands such as high data rate and high speed with low latency and simultaneously to save bandwidth and spectrum. In 5G and 6G networks, a high speed of transmitting and switching is required for internet of things (IoT) applications with higher capacity. To achieve these requirements a semiconductor optical amplifier (SOA) is considered as a wavelength converter to transmit a signal with an orthogonal frequency division multiplexing with subcarrier power modulation (OFDM-SPM). It exploits the subcarrier’s power in conventional OFDM block in order to send additional bits beside the normally transmitted bits. In this paper, we optimized the SOA’s parameters to have efficient wavelength conversion process. These parameters are included the injection current (IC) of SOA, power of pump and probe signals. A 7 Gbps OFDM-SPM signal with a millimeter waves (MMW) carrier of 80 GHz is considered for signal switching. The simulation results investigated and analyzed the performance of the designed system in terms of error vector magnitude (EVM), bit error rate (BER) and optical signal-to-noise ratio (OSNR). The optimum value of IC is 0.6 A while probe power is 9.45 and 8.9 dBm for pump power. The simulation is executed by virtual photonic integrated (VPI) software.

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