Abstract

In this Letter, we combine the use of optical preamplification at the receiver and optical pulse coding techniques with an optimized modulation format to effectively extend the sensing range of Brillouin optical time-domain anal ysis (BOTDA) sensors. Combining a return-to-zero modulation format with 25% duty cycle and linear gain preamplification allows for temperature and strain measurements over 120km of standard single-mode fiber with 3m spatial resolution and an rms strain–temperature accuracy of 3.1°C/60με respectively.

© 2011 Optical Society of America

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