Radio-over-fibre distribution using an optical D-fibre antenna (original) (raw)
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Studies on Optical Components and Radio Over Fibre Systems
2009
This is to certify that the thesis entitled "STUDIES ON OPTICAL COMPONENTS AND RADIO OVER FIBRE SYSTEMS" submitted by Ankush Kumar, Roll no-10509029 in partial fulfillment of the requirements for the award of Bachelor of Technology degree in Electronics and communication Engineering at the National Institute of Technology, Rourkela (Deemed University) is an authentic work carried out by him under my supervision and guidance. To the best of my knowledge, the matter embodied in the thesis has not been submitted to any other University/Institute for the award of any Degree or Diploma.
The development of passive (without RF amplifier) and optimised VHF-detector/optical-modulator circuit module as a device for operation in the 88-108 MHz band will be described in this paper. It uses illumination-type light-emitting diodes (LEDs) emitting at 650 nm as the light source, coupled with poly(methyl methacrylate) polymer optical fibre. Reactive impedance matching is performed between the optoelectronic light source and the antenna by taking into account the some capacitance variation with the frequency of the antenna and of the biased LED, not resolved with the packaging parasitic effects. The relatively simple device presented here and named wireless-over-polymer optical fibre may be useful in many low-frequency radio-over-fibre applications and may contribute to energy savings.
Microwave and Optical Technology Letters, 2000
The resonant frequency shifted from 160 to 200 MHz. The VSWR was kept less than 1.3 from 188 to 192 MHz. It was confirmed that the prototype antenna on glass covered the digital terrestrial radio band. 4. CONCLUSIONS A varactor-loaded compact folded dipole antenna has been proposed for digital terrestrial radio reception. The prototype antenna in free space showed a VSWR of less than 1.4 and gain between À1.4 and À3.1 dBi from 187 to 230 MHz. The VSWR remained less than 1.3 in the digital terrestrial radio band from 188 to 192 MHz, even when the antenna was attached to the glass. The proposed antenna has advantages of a compact structure of 332 mm by 30 mm, wide tuning range with low VSWR, and ease of fabrication. It will be used for digital terrestrial radio reception in vehicles.
IET Optoelectronics, 2010
This study describes a wide range of salient radio-over-fibre system issues. Impulse radio and multiband ultra-wideband signal distribution over both single-mode fibre and multi-mode fibre (MMF) implementations are considered. Carrier frequencies ranging from 3.1 to 10.6 GHz, up to 60 GHz, are featured, and the use of microring laser transmitters is discussed. A cost -performance comparative analysis of competing distributed antenna system topologies is presented, and a theoretical approach to understanding the factors underlying radio-over-MMF performance for within-building applications is discussed. Finally, techniques to minimise thermal impacts on performance are described and novel energy-efficient schemes are introduced. Overall, this study provides a snap-shot of research being undertaken by European institutes involved in the Building the future Optical Network in Europe (BONE) project.
Radio over fibre technology for shipboard antenna links
Journal of Marine Engineering & Technology
The article shows the use of radio over fibre (RoF) analogue fibre links in numerous shipboard radio communication applications, which creates a demanding competition for coaxial lines and waveguides. The structure and properties of fibre optic links used for transporting microwaves in maritime engineering have been described. The article presents the use of RoF technology in satellite communications and fibre optic antenna link for global positioning system. The RoF link parameters essential for obtaining proper quality parameters of signal transmission have been determined. Moreover, the parameters of the RoF link have also been measured and evaluated in terms of the needs and requirements of ship installations.
Baseband Radio over Fiber Aided Millimeter-Wave Distributed Antenna for Optical/Wireless Integration
IEEE Communications Letters, 2000
A Baseband Radio Over Fiber (BROF) architecture is proposed, where upto four Radio Frequency (RF) carriers can be generated, while using the heterodyne photo-detection of only two optical signals. This proposed BROF architecture has a star-like structure and it is composed of six Radio Access Units (RAUs), where data is transmitted from the Central Unit (CU) to the Base Station (BS) and from the BS to the RAU over a distance of 20 Km and 0.3 Km, respectively, at a rate of 768 Mbps. The performance of the system supporting four carrier frequencies drops by at most 1dB, at a BER of 10 −9 , compared to conventional heterodyne photo-detection. Index Terms-Radio over fiber, distributed antenna system, heterodyne detection, time division duplexing. I. INTRODUCTION T HE past decade has seen a huge increase in the number of wireless communication subscribers and the development of high-bandwidth services. Radio Over Fiber (ROF) is expected to constitute the backbone of future wireless communication systems. Baseband ROF (BROF) [1] and Analogue ROF (AROF)[2] are commonly employed optical transmission techniques in ROF communication. The ROF optical signals are transmitted over an optical network that utilises either Wavelength Division Multiplexing (WDM)[3] or Time Division Multiplexing (TDM)[4] to serve multiple Radio Access Units (RAUs). Unlike WDM, TDM requires fewer semiconductor lasers, but its employement is limited to digital optical links. The detection of these optical signals can be direct [2] or heterodyne [2],[3]. AROF employs an analogue optical link. Hence the achievable data-rates and fiber-lengths are severely limited by fiber dispersion and the optical link's non-linearity [2]. In contrast to AROF, BROF utilises a more robust digital optical link [1]. However, unlike AROF, the RAU in a BROF-based architecture performs more complex signal processing and up-conversion to Radio Frequency (RF). The need to have up-convertors in a BROF RAU can be relaxed through the use of heterodyne photo-detection [2]. However, conventional heterodyne photo-detection of two optical signals is capable of generating a signal only at a single RF carrier at the difference of the two optical frequencies Manuscript received December 19, 2012. The associate editor coordinating the review of this letter and approving it for publication was T. Yioultsis.
Distributing Microwave Signals via Polymer Optical Fiber (POF) Systems
A technique to distribute GHz microwave signals via Graded Index Polymer Optical Fiber (GIPOF) is proposed. The method employs fast sweeping of the optical frequency at the headend and a periodic filter at the remote station, where high frequency microwave signals are generated and fed into antennas. The sweeping rate of the optical frequency is kept within the modal dispersion-limited bandwidth of GIPOF. Simulation results with and without data modulation show this to be a promising technique with possible application in distributing wireless LAN signals. GIPOF offers lower installation and maintenance costs than silica fiber and yet higher performance than copper cables.
Radio over Fiber Technology: A Review
2015
In RoF(Radio-over-Fibre) technology, optical fiber links are used to send RF signals from central station (head end) to base station(BS). RF signal processing functions are performed at head end. So, BSs complexity is greatly reduced. At BS only optoelectronic conversion and amplification functions are performed.
A multi-layered proximity coupled patch suitable for MMIC integration
Microwave and Optical Technology Letters, 2006
aperture surface of the circular antenna and the load of circular antenna is placed at the center [6]. shows the antenna factor of the EM sensor arranged with E-null configuration and H-null configuration as a function of frequency ranged from 50 MHz to 3 GHz. The antenna factor is about 98.18 (dB) and 100.0 (dB) for E-null configuration at 50 MHz and 3 GHz, respectively. Similarly, the antenna factor is about 115.21 (dB) and 110.3 (dB) for H-null configuration at 50 MHz and 3 GHz, respectively. For measuring the electric field and magnetic field, it can be seen that the antenna factor and associated sensitivity of the EM sensor are almost flat in the frequency range of 50 MHz and 3 GHz. Therefore, the linear performance of this EM sensor can be achieved.