Fiber optic sensor based on a sagnac interferometer including a recirculating-ring delay line with an edfa |
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Authors: | J T Kringlebotn K Bl tekjaer C N Pannell |
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Institution: |
a Optoelectronics Research Center University of Southampton Southampton, United Kingdom
b Optoplan AS, Trondheim, Norway
c Division of Physical Electronics, The Norwegian Institute of Technology, The University of Trondheim Trondheim, Norway |
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Abstract: | We present a theoretical and experimental investigation of a Sagnac interferometer incorporating a fiber optic recirculating-ring delay line with an erbium-doped fiber amplifier to increase the effective length of the Sagnac loop and thereby improve the low-frequency response. Theoretical calculations show that the low-frequency response of the interferometer is enhanced as expected. However, the noise penalty of using a fiber amplifier in the ring is quite high, especially at low frequencies. The signal-to-noise ratio at low frequencies, using a superfluorescent erbium fiber source, is demonstrated as increasing by a factor of 2 compared to a single-loop Sagnac interferometer with the same total length of fiber, but without fiber amplifier. |
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Keywords: | fiber optic sensors Sagnac interferometer erbium-doped amplifiers recirculating delay lines |
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