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Transcript of ROF main11
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ROF -RADIO OVER
FIBER TECHNOLOGY
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K.Raghava Vamsi K.RakeshDepartment of ECE Department of ECE
GPCET Engineering College: JNTU GPCET Engineering College: JNTU
[email protected] [email protected]
mailto:[email protected]:[email protected]:[email protected]:[email protected] -
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TOPICS
Introduction
Network Architecture
ROF link configurations
Single and Multimode fibers
Applications
Advantages
Limiting factors
Conclusion
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INTRODUCTION
o Combination of wireless
and optical fibers.
o Usage of optical fibers
instead of copper coaxial wires.
Protective Skin
core
Cladding
Copper coaxial cable
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BASIC ROF ARCHITECTURE
Analog
modulator
Power
combiner
Digital
modulator
Analog
demodulator
Digital
demodulator
Analog Optic Fiber Link
Fiber optic
Transmitter
Fiber optic
Receiver
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INTEGRATION OF FIBER AND
WIRELESS NETWORKS
Mini switching
center (CO)
High capacityMetropolitan
area network
Optical
access
network
Indoor
wirelessnetworks
Outdoor
wireless
networks
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ARCHITECTURE OF ROF WITH AN
OPTICAL WDM MAN
BSBS
RN
CO2
RN
BS BS
CO1`
RNRN
BSBS
TrunkNetwork
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RADIO SIGNALS TRANSPORT SCHEMES
FOR ROF SYSTEMS
Central
Office(CO)
Optical
interface
Remote
antenna
r fiber
r fiber
4
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SIGNAL TRANSMISSION VIA RF OVER
FIBER
Base Station
fIF1
fIFn
Nod
e fLO
E/O
O/ETX
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SIGNAL TRANSMISSION VIA IF OVER
FIBER
fIF1
fIFn
E/O
Base Station
O/E
T
XfLO
N
od
e
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SIGNAL TRANSMISSION VIA
BASEBAND OVER FIBER
No
de
E/O
fIF1
fIFn
Base Station
fLO
O/E TX
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SINGLE AND MULTIMODE
FIBER (SMF AND MMF)
Link between CO and BS is the optical fiber.
Optical fibers are classified into two Single and
Multimode fiber.
MMF is efficient, as it has high numerical aperture that
means larger acceptance angle that allows more optical
power to be coupled into a fiber
Due to low bandwidth and high core diameter MMF is
better over SMF
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APPLICATIONS OF RADIO OVER FIBER
Access to dead zones
FTTA(fiber to the antenna)
3G and 4Gmobiles
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MILITARY APPLICATION
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RADIO OVER FIBER IN THE HOME
AREA NETWORK
Gateway
Works
pac
e
bedroom
Children
sbedroom
Parents
Kitchen
L
iving-r
oom
Garage
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ADVANTAGES OF RADIO-OVER-
FIBER
Low attenuation
Lower cost
Future proof
Low complexity
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LIMITING FACTORS
Dynamic range is the most important parameter for
mobile communications such as GSM.
Dispersion which leads to inter symbol interference.
Three types-intermodal, chromatic and waveguide.
Crosstalk and non-linear effects.
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FIBER OR RADIO? YES!
In many cases radio is by far the faster and cheaper way
to provide the last mile of Internet access and that only
radio supports roaming while only fiber (of todays
alternatives) is appropriate for high capacity backbone.
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CONCLUSION
ROF technology is an essential technology, provides
huge bandwidth, mobility and feasibility.
The limiting factors of optical fibers have a great impact
on the optical links which may limit the Bit speed and
transmission rate in ROF systems.
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REFERENCES
[1] D.Opatic,Radio over fiber technology, GSDC Croatia.
[2] Roland Yuen, Xavier N.Fernando and Sridhar Krishnan,
Radio over Multimode fiber for wireless access, Ryerson
University.
[3] Dr.K.Palaniswamy, Engineering Physics, Anna
University.
[4] Gerd Keiser, Optical Fiber Communications, 3rd
edition, Mc Graw-Hill, 2000.
[5] S.C.Gupta, Textbook on Optical Fiber Communications
and its Applications, PHI,2005.
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