Signal processing method based on group delay calculation for distributed Bragg wavelength shift in optical frequency domain reflectometry | Zendy

Daichi Wada | Zendy; Hirotaka Igawa | Zendy; Hideaki Murayama | Zendy; Tokio Kasai | Zendy

Open Access

Signal processing method based on group delay calculation for distributed Bragg wavelength shift in optical frequency domain reflectometry

Author(s) -

Daichi Wada,

Hirotaka Igawa,

Hideaki Murayama,

Tokio Kasai

Publication year - 2014

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.22.006829

Subject(s) - reflectometry , optics , fiber bragg grating , wavelength , time domain , signal processing , signal (programming language) , fast fourier transform , fourier transform , materials science , group delay and phase delay , physics , bandwidth (computing) , computer science , digital signal processing , telecommunications , algorithm , quantum mechanics , computer hardware , computer vision , programming language

A signal processing method based on group delay calculations is introduced for distributed measurements of long-length fiber Bragg gratings (FBGs) based on optical frequency domain reflectometry (OFDR). Bragg wavelength shifts in interfered signals of OFDR are regarded as group delay. By calculating group delay, the distribution of Bragg wavelength shifts is obtained with high computational efficiency. We introduce weighted averaging process for noise reduction. This method required only 3.5% of signal processing time which was necessary for conventional equivalent signal processing based on short-time Fourier transform. The method also showed high sensitivity to experimental signals where non-uniform strain distributions existed in a long-length FBG.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research