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In the 5G mobile networks, the optical signal transmission will be widely used. Two main applications are important: short links for the access networks and long links in the backbone of the system. In this paper we investigate both applications. For that purpose we developed a method using simulations. Based on our simulation results we present proper methods to avoid distortion, which is caused...
Several system applications require optical transmission of very high bit-rate digital as well as microwave and millimeter-wave carrier signals. Without completeness, a few recent applications are mentioned such as: 5G and Radio-over-Fiber (RoF) systems, Gigabit Passive Optical Networks (GPON), optical interconnection within Cloud for telecommunication Network Elements (NE), upgrade of mobile access,...
This paper proposes an optimum hybrid radio over multi-mode fiber and free space optics (RoMMF-FSO) system to enhance the last mile bottleneck issues of wireless communication systems. Single mode fiber (SMF) and gradient index (GRIN) lenses are used as mode filtering techniques to optimize the system performance by mitigating the modal effects produced by multimode optical fiber networks. We characterize...
Multimode fiber links can offer a useful approach for low cost and short Radio over Fiber (RoF) systems. However, in these connections the distortion effects are higher than in a singlemode fiber system. These effects can be compensated by a suitable optical receiver. In this paper an improved receiver structure is investigated for Radio over Multimode fiber systems. N-QAM radio signal transmission...
Multimode fiber (MMF) links are currently attracting much interest as a medium for the transmission of radio signals over optical links called Radio over Fiber (RoF) link. However, the application is restricted, because the capacity of MMF transmission is limited by intermodal dispersion which is caused by the different propagation speeds of the fiber modes. The free space propagation of radio waves...
The OFDM modulation format is widely used in several wireless applications because it is robust against multi-path distortions in the radio channel. The OFDM signals are usually transmitted over an optical link to the wireless network. However OFDM is sensitive to the channel nonlinearities. The nonlinearity of this type of modulation can cause distortion and this way limitation on the optical transmission...
A new method is presented for establishing variable microwave time delay utilizing optical approaches. In many applications there is a need for a significant time delay which cannot be established by microwave methods. The optical fiber can offer a substantial time delay which can be utilized by converting the microwave signal into the optical domain and after the proper delay it is converted back...
Eliminating dispersion effects fast is a crucial concern when building next generation optical networks. Dispersion penalty has been investigated widely in 1550nm fiber-optical links transmitting different kind of signals. However, only a few papers addressed the harmonics generation effect. This paper presents theoretical and experimental results on the estimation of harmonic effects in the transmission...
In this paper a promising optical packet switching node concept is presented for optical packet switched networks. We developed a new label processing approach for core nodes in a subcarrier multiplexed label swapping network with advantageous implemented functionalities. We present the experimental results of the implemented node.
<para> This paper demonstrates that in broadband networks in-line semiconductor optical amplifiers (SOAs) beside providing system gain can also be used as simultaneous transceivers. The SOA branching stages are studied and presented for bus configuration. Using a steady-state model, we have made a small-signal approximation applying an equivalent circuit for detection based on the rate equations...
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