Sagnac interferometer including a recirculating ring with an erbium-doped fibre amplifier

Kringlebotn, J.T., Blotekjaer, K. and Pannell, C.N. (1992) Sagnac interferometer including a recirculating ring with an erbium-doped fibre amplifier. In, Proceedings of 8th Optical Fiber Sensors Conference. 8th Optical Fibre Sensors Conference New York, US, Institute of Electrical and Electronics Engineers, 6-9. (doi:10.1109/OFS.1992.762937).


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The use of a Sagnac interferometer as an acoustic sensor has recently been demonstrated [1]. One reason for using a Sagnac interferometer is that the path imbalance is zero, such that no interferometric conversion of the source phase noise to intensity noise occurs. The low frequency response of a Sagnac interferometer increases with increasing loop length, and a very long length of fibre is needed to achieve high responsivity for acoustical frequencies. In this paper we present a scheme where we enhance the low frequency response using a recirculating ring within the Sagnac loop, as shown in fig. 1, thereby increasing the effective length of the Sagnac loop. To increase the number of recirculations an erbium-doped fibre amplifier is incorporated in the ring to compensate for both the coupling and the intrinsic losses of the ring. We also present the results of a noise analysis of a recirculating ring including a fibre amplifier, and show that the dominating noise in our sensor is the beat noise between the signal and the spontaneous emission produced by the fibre amplifier

Item Type: Book Section
Digital Object Identifier (DOI): doi:10.1109/OFS.1992.762937
Additional Information: Paper W1.2
ISBNs: 0780305183
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions : University Structure - Pre August 2011 > Optoelectronics Research Centre
ePrint ID: 77365
Accepted Date and Publication Date:
January 1992Delivered
Date Deposited: 11 Mar 2010
Last Modified: 31 Mar 2016 13:11

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