Article

Performance Evaluation of Digital Coherent Receivers for Phase-Modulated Radio-Over-Fiber Links

Dept. of Photonics Eng., Tech. Univ. of Denmark, Lyngby, Denmark
Journal of Lightwave Technology (impact factor: 2.78). 12/2011; DOI:10.1109/JLT.2011.2167595 pp.3282 - 3292
Source: IEEE Xplore

ABSTRACT The performance of optical phase-modulated (PM) radio-over-fiber (RoF) links assisted with coherent detection and digital signal processing (PM-Coh) is analyzed and experimentally demonstrated for next-generation wireless-over-fiber systems. PM-Coh offers high linearity for transparent transport of high-frequency microwave signals, and better receiver sensitivity than intensity modulated with direct detection systems. By including photonic downconversion in the PM-Coh link, in a form of a pulsed free-running local oscillator, it is possible to receive high-RF carrier frequencies, with low-bandwidth electronics. Analytical assessment and simulations are used to determine the ultimate performance with respect to laser linewidth, modulation index, and receiver sensitivity. Then, two different scenarios are studied and experimentally demonstrated as an application of PM-Coh links: a high-capacity multiantenna RoF system (12 subcarriers of 400 Mb/s and 6 subcarriers of 800 Mb/s) and photonic downconversion for the detection of high-RF carriers microwave signals (up to 3.2 Gb/s at 40 GHz).

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Keywords

Analytical assessment
 
coherent detection
 
digital signal processing
 
direct detection systems
 
high-frequency microwave signals
 
high-RF carrier frequencies
 
high-RF carriers microwave signals
 
intensity modulated
 
laser linewidth
 
low-bandwidth electronics
 
modulation index
 
next-generation wireless-over-fiber systems
 
optical phase-modulated
 
photonic downconversion
 
PM-Coh
 
PM-Coh link
 
PM-Coh links
 
pulsed free-running local oscillator
 
transparent transport
 
ultimate performance