Abstract

We experimentally investigate the benefits of a new optical pulse coding technique for long-range, meter and submeter scale Raman-based distributed temperature sensing on standard single-mode optical fibers. The proposed scheme combines a low-repetition-rate quasi-periodic pulse coding technique with the use of standard high-power fiber lasers operating at $1550\mathrm{nm}$, allowing for what we believe is the first long-range distributed temperature measurement over single-mode fibers (SMFs). We have achieved $1\mathrm{m}$ spatial resolution over $26\mathrm{km}$ of SMF, attaining $3°\mathrm{C}$ temperature resolution within $30\mathrm{s}$ measurement time.

© 2011 Optical Society of America

Simplex-coded BOTDA fiber sensor with 1 m spatial resolution over a 50 km range

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