Digital predistortion for RSOAs as external modulators in radio over fiber systems.
Open Access
- 23 August 2011
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 19 (18), 17641-17646
- https://doi.org/10.1364/oe.19.017641
Abstract
Reflective semiconductor optical amplifiers (RSOAs) can be used as external modulators in radio over fiber (RoF) links due to their amplification and modulation characteristics and colorless property. The nonlinear distortion of RSOA, however, limits its dynamic range. In this paper we demonstrate digital predistortion (DPD) linearization techniques to improve the linearity of RSOA external modulators. 64 quadrature amplitude modulation (QAM) signals are utilized to extract the model parameters. The dynamic AM/AM and AM/PM characteristics and power spectral densities of the modulated signals from the RSOA are demonstrated without and with DPD. Experimental results show clearly that the nonlinear distortion of RSOA external modulators in RoF links can be compensated using DPD linearization techniques.This publication has 13 references indexed in Scilit:
- Experimental Validation of a Reflective Semiconductor Optical Amplifier Model Used as a Modulator in Radio Over Fiber SystemsIEEE Photonics Technology Letters, 2011
- Radio-Over-Fiber Access Network Architecture Based on New Optimized RSOA Devices With Large Modulation Bandwidth and High LinearityIEEE Transactions on Microwave Theory and Techniques, 2010
- Improvements in the Linearity of Semiconductor Optical Amplifiers as External ModulatorsIEEE Transactions on Microwave Theory and Techniques, 2010
- Analysis of and compensation for non-ideal RoF links in DAS [Coordinated and Distributed MIMO]IEEE Wireless Communications, 2010
- A Comparison of Radio Over Fiber Link Types for the Support of Wideband Radio ChannelsJournal of Lightwave Technology, 2010
- Radio Over Fiber Link Design for Next Generation Wireless SystemsJournal of Lightwave Technology, 2010
- Low-Cost FPGA Implementation of Volterra Series-Based Digital Predistorter for RF Power AmplifiersIEEE Transactions on Microwave Theory and Techniques, 2010
- Bidirectional Radio-Over-Fiber System With Phase-Modulation Downlink and RF Oscillator-Free Uplink Using a Reflective SOAIEEE Photonics Technology Letters, 2008
- Open-Loop Digital Predistorter for RF Power Amplifiers Using Dynamic Deviation Reduction-Based Volterra SeriesIEEE Transactions on Microwave Theory and Techniques, 2008
- Digital predistortion of wideband signals based on power amplifier model with memoryElectronics Letters, 2001