Open AccessClipping Distortion Suppression of Directly Modulated Multi‐IF‐over‐Fiber Mobile Fronthaul Links Using Shunt Diode Predistorter
Author(s) -
Han Changyo,
Cho SeungHyun,
Sung Minkyu,
Chung Hwan Seok,
Lee Jong Hyun
Publication year - 2016
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.16.2515.0038
Subject(s) - intermodulation , electronic engineering , spurious free dynamic range , clipping (morphology) , dynamic range , laser diode , diode , nonlinear distortion , optical fiber , radio over fiber , computer science , telecommunications , engineering , materials science , optoelectronics , amplifier , linguistics , philosophy , cmos
Herein, we demonstrate clipping distortion suppression of directly modulated multi‐IF‐over‐fiber links using a simple shunt diode predistorter. The dynamic range of a directly modulated analog fiber optic link is limited by nonlinear distortions caused by laser‐diode clipping. We investigate the link performance in the context of carrier‐to‐noise and distortion ratio (CNDR) and error vector magnitude (EVM) requirements when supporting LTE‐A services. We also design an analog predistorter with a shunt‐diode structure, and demonstrate experimentally that the predistorter has the ability to suppress clipping‐induced third‐order intermodulation distortions of the link by at most 14 dB. It also improves the CNDR and EVM of the 4‐IF‐multiplexed LTE‐A carriers by 7 dB and 2.9%, respectively.