Simplified RF Carrier Extraction and Reuse in OFDM Radio-Over-Fiber Systems

We propose and experimentally demonstrate techniques for efficient RF carrier extraction and reuse in an orthogonal frequency-division multiplexing (OFDM) radio-over-fiber (RoF) system. In this system, an RF carrier is generated in the base station through optical heterodyning between two uncorrelat...

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Bibliographic Details
Published in:IEEE photonics technology letters 2014-09, Vol.26 (17), p.1734-1737
Main Authors: Hameed, Mahmood A., Rongqing Hui
Format: Article
Language:English
Subjects:
Carriers
Conversion
Extraction
Modulation
OFDM
Offices
Optical fibers
Optical filters
Optical mixing
Orthogonal Frequency Division Multiplexing
Oscillators
Radio frequency
radio frequency photonics
Radio-over-fiber
Reuse
Uplink
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Description
Summary:We propose and experimentally demonstrate techniques for efficient RF carrier extraction and reuse in an orthogonal frequency-division multiplexing (OFDM) radio-over-fiber (RoF) system. In this system, an RF carrier is generated in the base station through optical heterodyning between two uncorrelated optical carriers delivered from the central office. The RF down conversion is accomplished by mixing the intermediate frequency signal with the extracted RF carrier. This not only relaxes the phase noise requirement on the RF carrier, but also minimizes signal-signal beat interference. We demonstrate an RoF network carrying 8.2 Gb/s QPSK data in OFDM modulation format for both downlink and uplink, which share the same RF carrier, which avoids the need of an additional RF oscillator in the customer unit.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2014.2332424