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 . 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|
|Additional Information:||Paper W1.2|
|Subjects:||Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
|Divisions:||University Structure - Pre August 2011 > Optoelectronics Research Centre
Faculty of Physical Sciences and Engineering > Optoelectronics Research Centre
|Date Deposited:||11 Mar 2010|
|Last Modified:||27 Mar 2014 18:57|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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