Interrogation of wavelength, multiplexed fiber Bragg gratings using spectral filtering and amplitude-to-phase optical conversion

• Type: Article in International Scientific Journal
• Date: 2003

Authors

Abad, S (Author) Other; Araujo, FM (Author) Other; Ferreira, LA (Author) Other; Santos, JL (Author) FCUP; Lopez Amo, M (Author) Other

Journal

Title: Journal of Lightwave Technology

Vol. 21

Pages: 127-131

ISSN: 0733-8724

Publisher: Optical Society of America

Indexing

ISI Web of Knowledge - 24 Citations

Scopus - 31 Citations

Scientific classification

FOS: Engineering and technology > Electrical engineering, Electronic engineering, Information engineering

Other information

Authenticus ID: P-000-K0W

DOI: 10.1109/jlt.2002.802228

Abstract (EN): A technique for interrogating multiplexed FBG sensors using all-fiber low-cost devices is demonstrated. It is based on spectral filtering employing a fused biconical wavelength-division multiplexer and on amplitude-to-phase optical conversion to perform power referencing. Four FBG sensors are wavelength multiplexed in the network, and a 3-nm-wide tunable optical filter is, employed at the detection block for sensor demultiplexing. With this technique an operation range of more than 2 nm is demonstrated for the sensors with achievable wavelength static resolution ranging from 1.9 to 13.4 pm/Hz(1/2) with no observable hysteresis. As for power referencing, the system is proven to be unaffected by power variations as high as 75% of the total power launched by the source. Finally, output-phase variations due to crosstalk are shown to be under 1% of-the total output phase range, with more than 29-dB optical isolation between channels.

Language: English

Type (Professor's evaluation): Scientific