Title :
A new electrical signal configuration for modulating pump light of coded discrete-phase shift pulse-BOTDA
Author :
Zan, M.S.D.B. ; Horiguchi, T.
Author_Institution :
Grad. Sch. of Eng. & Sci., Shibaura Inst. of Technol., Tokyo, Japan
Abstract :
Distributed optical fiber sensors by using Brillouin optical time-domain analysis (BOTDA) have been developed extensively by many researchers. Coding pulsed pump light of the BOTDA is an effective way to improve the signal-to-noise ratio (SNR). This article reports a new way to configure electrical signals that are amplified by an AC-coupled highspeed amplifier and then fed into an electro-optic modulator to generate coded pump light. The new configuration caused little distortion of the amplified electrical signals and consequently produced coded pump light with a good waveform with the modulator. The optical SNR of the coded BOTDA signals achieved by the new configuration was about 1 dB better than that by a conventional way for 32 bit-length code.
Keywords :
Brillouin spectra; amplifiers; fibre optic sensors; optical modulation; time-domain analysis; AC-coupled high-speed amplifier; Brillouin optical time-domain analysis; coded discrete-phase shift pulse-BOTDA; distributed optical fiber sensors; electrical signal configuration; electrical signals; electro-optic modulator; optical SNR; pump light modulation; signal-to-noise ratio; word length 32 bit; Optical amplifiers; Optical fiber amplifiers; Optical fiber cables; Optical fiber sensors; Optical pulses; Scattering; Signal to noise ratio;
Conference_Titel :
Photonics (ICP), 2012 IEEE 3rd International Conference on
Conference_Location :
Penang
Print_ISBN :
978-1-4673-1461-9
DOI :
10.1109/ICP.2012.6379861