Performance Enhancement of 8 Channel WDM-RoF PON system at 80 Gbps data rate using Raman Amplifier (original) (raw)
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Springer Nature Singapore Pte Ltd. , 2018
In today's time due to the spread of smart phones, tablets, various machine-to-machine (M2M) communication-based applications and the rapid arrival of the internet of things (IoT)-based applications have raised request of huge bandwidth. Services for applications like transfer of various types of images, high-quality video streaming, and upcoming concepts of clouds in real time demand wireless broadband access. To cater such demands wireless access schemes using radio over fiber (RoF) technology can be used faithfully. RoF is becoming matured technology in terms of security, reliability, and coverage. Use of Raman amplifier can be done to mitigate limitations such electrical power attenuation, multipath fading, and chromatic dispersion for comparatively long distances in many applications. In this paper we have proposed the design of WDM-RoF-PON link operated at 80 Gbps data rate which comprises 8 multiplexed channels with 100-GHz channel spacing with PSK modulation technique. Due to their abundant bandwidth RoF networks are expert of supporting multiple RF subcarrier signals at a same time. Performance of proposed system is evaluated in terms of Q factor and BER parameters which provides better insight into quality of received signals in many applications. Keywords Radio over fiber (RoF) Á Phase-shift keying (PSK) Quadrature amplitude modulation (QAM) Á Passive optical network (PON) Central site (CS) Á Remote site (RS)
Performance of WDM fiber-radio network using distributed Raman amplifier
IEEE Photonics Technology Letters, 2006
We investigate the impairment induced by stimulated Brillouin scattering (SBS) effect and noise characteristics of wavelength-division-multiplexing fiber-radio network assisted by distributed Raman amplifier (DRA) or erbium-doped fiber amplifier. Experimental results indicate that forward-pumping DRA can increase the link optical output power limited by SBS effect in downstream transmission and backward-pumping DRA can improve signal-to-noise ratio in upstream transmission, which is verified by binary phase-shift keying transmission experiments. Moreover, our experimental results show that DRA does not introduce additional impairment from interchannel crosstalk due to cross-phase modulation and degradation in spur-free dynamic range. Index Terms-Broad-band wireless access, distributed Raman amplifier (DRA) and crosstalk, fiber-radio.
Review of “Radio-Over-Optical-Fiber-Networks”
Review of “Radio-Over-Optical-Fiber-Networks” by Yu, J., et al., (2009), 2019
ANALYTICAL EXPOSITION The phenomenal growth in the use of smart phones, tablets, wearables, other mobile data consuming devices, and Internet of things (IoT), etc., combined with advanced applications, now requires high capacity heterogeneous wireless networks. The essay or review below describes or analyses the content, style and merit of the research article on Review of "Radio-Over-Optical-Fiber-Networks" by Yu, J., et al., (2009) Convergence of wired and wireless services is dependent upon the progress made by the next-generation access networks. The broad-band evolution coupled with the phenomenal growth in the Internet has precipitated intense traffic patterns in access networks (Yu, J., et al, 2009). The high-speed, symmetric, and guaranteed bandwidth demands for future video services have also contributed to the convergence of wired and wireless services provided by the next-generation access networks. A unified networking platform for fixed and mobile users is now clothed with mobility features that deliver voice, data, and video services (Yu, J., et al, 2009). The IEEE802.16 or WiMAX standard has now been established to bridge the last mile though mobile and fixed wireless access to the end user at frequencies between 2 and 66 GHz. The cost of system installation and maintenance of such systems is ABSTRACT The review below describes or analyses the content, style and merit of the research article on Review of "Radio-Over-Optical-Fiber-Networks" by Yu, J., et al., (2009) in the context of latest developments in the area. The phenomenal growth in the use of smart phones, tablets, wearables, other mobile data consuming devices, and Internet of things (IoT), etc., combined with advanced applications, now requires high capacity heterogeneous wireless networks. Optical Fiber communication has enabled telecommunications link to be made over greater distance and with lower levels of losses in transmission medium. Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. Modern fiber-optic communication systems generally include an optical transmitter to convert an electrical signal into an optical signal to send into the optical fiber, a cable containing bundles of multiple optical fibers that is routed through underground conduits and buildings, multiple kinds of amplifiers, and an optical receiver to recover the signal as an electrical signal. In the Radio over Fiber (ROF) links, the radio frequency (analog) waveform (with embedded base band information) continuously modulates the light wave. The architecture for ROF is when the optical fibers transmit the RF signal between central-base station (CBS) and low power Radio Access Point (RAP). The IEEE802.16 or WiMAX standard has now been established to bridge the last mile though mobile and fixed wireless access to the end user at frequencies between 2 and 66 GHz.
Optik, 2016
This paper investigated the performance of diverse optical amplifiers SOA, EDFA, Raman and hybrid amplifiers (SOA-EDFA, EDFA-EDFA, Raman-EDFA) at frequency spacing of 50 GHz in 8 × 10 Gbps WDM system. Examine the performance on the basis of output power, Q-factor, BER, and eye opening by varying distance from 20 to 200 km. It is found that SOA-EDFA provides maximum output power, acceptable Q-factor, maximum eye opening and lowest BER at a distance of 100 km. The impact of Raman fiber length on hybrid optical amplifier (Raman-EDFA) at 100 km transmission distance has been investigated and found that hybrid optical amplifier at 10 km Raman fiber length provides better output power and Q value.
Cost-Effective OFDM WDM-PON system Delivering Downstream data 100Gbps and Upstream data 2 Gbps
12th International Conference on Fiber Optics and Photonics, 2014
This paper presents Long Reach Orthogonal frequency division multiplexing Wavelength Division Multiplexing Passive Optical Network (OFDM WDM-PON) system capable of delivering downstream 100 Gbit/s data and upstream 2 Gbit/s data on a single wavelength. The optical source for downstream data and upstream data is Continous wave Laser at central office and reflective semiconductor optical amplifier (RSOA) at each optical network unit. We use two RSOAs at each optical network unit for the 2-Gb/s upstream transmission. We extend the maximum reach of this OFDM WDM PON to be 50 km by using Raman amplifiers at the RN. The hybrid amplifier is designed to enhance the signal power and compensated the fiber dispersion over a wide wavelength range. The combination of 45 km single mode fiber and 5 km dispersion compensated fiber (DCF) is used for transmission of upstream data to improve uplink performance. This research focuses on the implementation and performance analysis of high data rate coherent optical OFDM WDM PON for long-haul transmission. OptiSystem-12 simulation tool is fully used to design and implement the system. The performance of the system is studied and analyzed system in terms of Bit-Error-Rate (BER), the effect of the transmission distance on the constellation diagram, and the relation of BER and OSNR with regard to transmitted input power.
Review on Radio over Fiber Systems for Capacity Enhancement
مجلة جامعة دهوك, 2022
Radio-over-fiber (RoF) system is one of the latest plans for future wideband wireless communication systems like mobile communications, suburban and residential areas. These are good nominees to build the backbone of the next generation of wireless networks. Besides, the fundamental requirement for nextgeneration radio optical fiber and mobile communication is the need for more capacity and speed which has a huge scope, that is further required for a better system to attain demands such as Fiber to The Home (FTTH) and 5G. The combination of RoF with spectrally-efficient modulation techniques can accomplish increasing demand for high data rates for mobile users. Currently, analog fronthaul is promoted as an energy-efficient and bandwidth solution that can reach the necessity of the 5G vision for high data rates, low latency, and energy efficiency. Mainly, this paper presents a review that focuses on various techniques which several approaches have been listed to perceive the large-capacity data transmission and describe them including Wavelength Division Multiplexing (WDM), Subcarrier Multiplexing (SCM), Mode Division Multiplexing (MDM), Polarization Division Multiplexing (PDM), Generalized Frequency Division Multiplexing (GFDM), Parallel Intensity Modulation (PIM)/Phase Modulation (PM) transmitter, and Millimeter-wave (Mm wave) generation techniques. Also, a comparison between them has been done.
Gain and bandwidth improvements for distributed Raman amplifier in UW-WDM communication systems
16th International Conference on Advanced Communication Technology, 2014
Fiber Raman amplifiers in ultra wideband wavelength division multiplexing (UW-WDM) systems have recently received much more attention because of their greatly extended bandwidth and distributed amplification with the installed fiber as gain medium. It has been shown that the bandwidth of the amplifier can be further increased and gain spectrum can be tailored by using pumping with multiple wavelengths. In this paper, the distributed multipumping Raman amplifier has been studied and analyzed by testing two designed algorithms of amplifier to obtain the gain of maximum flatness and bandwidth. Also we have investigated the effects of many parameters on the gain and bandwidth of Raman amplifier such as: pumping wavelength, offset wavelength, the relative refractive index difference and the number and location of the cascaded units used in the amplifier model design. The gain is computed over the spectral optical wavelengths (1.45μm ≤ λ signal ≤ 1.65μm). The differential gain of each unit of the amplifier is obtained according to the straight line-exponential model of a small maximum constant gain of 7.4×10-14 m/W over an optical wavelength interval of 16 nm. Keywords-Distributed multi-pumping Raman amplifier (DMRA), Raman gain, ultra wideband-wavelength division multiplexing (UW-WDM).
Raman optical amplifiers have more reliability than the repeater in the optical communication networks. In the optical amplifier, the transmission equals the gain bandwidth of the amplifiers. The optical amplifier has functionalities such as WDM amplification (gain equalization), gain control (rapidly variation of the gain), inter-stage access (compensation in the dispersion rate). This paper presents the optimum technical specifications of fiber Raman optical amplifiers (FROAs) with average power system for signal quality improvement in multiplexed systems. The signal has upgraded to a max. Q-factor of 11.47 applied along 1000 m as a range through the free-space optical (FSO) communication channel that has an attenuation rate of 10 dB/km. Our suggested system has clarified the best Q-factor that is greatly increased to reach 49.36 in the presence of the pump laser. The multiplexed communication systems signal quality is enhanced by the percentage ratio of 39.65%.
2.5Gb/s hybrid WDM/TDM PON using radio over fiber technique
Optik - International Journal for Light and Electron Optics, 2013
Hybrid gigabit-passive optical network (GPON) is a hybrid passive optical network, where wavelength division multiplexing (WDM) GPON and time division multiplexing (TDM)-GPON are integrated into a single passive optical network, reducing cost and increasing the data rate. In this paper, 2.5 Gb/s GPON downstream link is presented, using the radio over fiber (RoF) technique in GPON network architecture. It has been done by means of commercial OptiSystem simulation software, where, differential phase shift keying (DPSK) modulation is proposed by using 2.4 GHz radio frequency. The propagation of radio signals along a 25 km standard single mode fiber (SMF) investigated. The simulated model can support 32 and 64 users. The analysis was made based on the performance of eye diagram, optical signal to noise ratio (OSNR), constellation diagram, error vector magnitude (EVM) and received power.