In this paper, we propose free space optical (FSO) communication using laser light in the 2μm wavelength. FSO using the mid-infrared 2μm band can reduce the effects of turbulence and particles generated in free space and improve link performance. In addition, it has a large allowable exposure because it can be operated in a transparent window in the atmosphere or in a safety for human eyes. We will analysis link visibility, transmission characteristics and SNR of 2μm FSO, demonstrate the BER of the FSO link with fog experimentally. The theoretical analysis will show that visibility and transmission loss will be improved by 2μm FSO, and experimental results also show that BER performance can be improved about 2dB.
KEYWORDS: Analytical research, Free space optics, Atmospheric optics, Turbulence, Signal analyzers, Radio over Fiber, Radio optics, Mobile communications, Atmospheric turbulence
RoFSO technology can easily transmit radio frequency signals using optical carriers in the atmosphere. On the other hand, MIMO transmission have widely used in recent mobile communication, and there are some reports about FSOMIMO transmission. This paper demonstrates a RoFSO- MIMO transmission system which combines technologies of FSO-MIMO and RoF to enhance the flexibility of mobile front-haul. The proposed system uses pilot RF signals to estimate the FSO channel which is affected by atmospheric turbulence and so on. In this paper, we theoretically analyze RF signal quality for various turbulence conditions and show some experimental results of 2x2 RoFSO-MIMO transmission. Performance comparison results will show the effectiveness of the proposed technology.
The radio over fiber (RoF) relay scheme can contribute to solving the radio wave blind area problem and improving cell edge performance in 5G mobile communications. However, RoF relay system requires many pairs of optical fiber link or Tx/Rx unit in case of MIMO system. To reduce complexity and cost of RoF relay system, we propose a novel relay system using STBC (space-time block coding) and MRC (maximum rate combination) scheme. In this research, we demonstrate a basic experimental using WiMAX base station and show some simulation results.
KEYWORDS: Radio over Fiber, Modulation, Distortion, Optical amplifiers, Signal detection, Communication engineering, Wireless communications, Transparency, Intermodulation, Antennas
Nowadays, the RoF technology can utilize to converge the broadcasting and the broadband wireless communications,
because of their huge bandwidth, and protocol transparency. Transmitting RF signals are deteriorated by the nonlinearity
of the RoF link and following RF amplifier. This paper provides analysis method of intermodulation distortion and peak
factor of multicarrier RF signals including IEEE802.11g, ISDB-T and IEEE802.16e-2005 over intensity modulation /
direct detection (IM/DD) RoF link. Experimental evaluation is also presented in terms of the error vector magnitude
(EVM).
KEYWORDS: Radio over Fiber, Optical fibers, Amplifiers, Linear filtering, Antennas, Connectors, Telecommunications, Transmitters, Communication engineering, Data communications
As a new application of Radio-on-Fiber, digital divide solution by utilizing CATV network is proposed. We have been
discussed and demonstrated realization and effectively of proposed system by in-door experiment so far, however field
trial is very important for the practical use. Now, the radiation examination is done as an experiment bureau in the
mountainous area in Nara Prefecture aiming evaluating by the real operation, evaluating the correspondence with the link
design theory, and clarifying effectiveness in a real environment of the proposal system. In this paper, the result of the
field trial of the proposal and the SCM transmission is discussed and demonstrated.
KEYWORDS: Networks, Distortion, Broadband telecommunications, Radio over Fiber, Modulators, Absorption, Nonlinear optics, Radio optics, Particle filters, Data modeling
Digital broadcasting service and variety of communication services, 4th generation mobile, broadband wireless-LAN etc. are developed recently. Broadband wireless service over fiber technologies may play an essential role for emerging integrated services of broadcasting and communications in the area of entrance network. Low-distortion transmission of broadband radio signals are developed as a collaborative work of Osaka University, Advanced Telecommunication research Institute (ATR) and Osaka Institute of Technology supported by Strategic Information and Communication R&D Promotion Program (SCOPE) of Government.
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