Open AccessCharacterization of passive optical components with ultra-fast speed and high-resolution based on DD-OFDM
Author(s) -
Banghong Guo,
Tao Gui,
Zhaohui Li,
Yuan Bao,
Xingwen Yi,
Jianping Li,
Xinhuan Feng,
Songhao Liu
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.022079
Subject(s) - fast fourier transform , optics , orthogonal frequency division multiplexing , signal (programming language) , modulation (music) , channel (broadcasting) , multiplexing , measure (data warehouse) , time domain , physics , materials science , computer science , telecommunications , acoustics , algorithm , database , computer vision , programming language
The passive optical components with very fine structures in wavelength domain are very sensitive to the mechanical vibrations or thermal fluctuations. If the measurement speed is lower than the temperature and mechanical fluctuation, we cannot measure the dynamic characteristics of the optical components. In this paper, we propose and demonstrate a novel method with ultra-fast measurement speed and high-resolution based on optical channel estimation using direct-detected orthogonal frequency division multiplexing (DD-OFDM) signal, which can be used to measure the dynamic characteristics and fine structure of the passive optical components. In experiment, by using fast Fourier transform (FFT) and a low-cost electro-absorption modulated laser (EML), we can achieve the transfer function characteristics with 3.9 MHz resolution. Compared with the optical channel estimation using coherent OFDM signal reported before, the proposed measurement technique is cost-effective.