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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Description/Abstract
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 |
|---|---|
| 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 Faculty of Physical and Applied Science > Optoelectronics Research Centre |
| Item ID: | 77365 |
| Date Deposited: | 11 Mar 2010 |
| Last Modified: | 01 Sep 2011 10:53 |
| Contributors: | Kringlebotn, J.T. (Author) Blotekjaer, K. (Author) Pannell, C.N. (Author) |
| Date: | 1992 |
| Additional Information: | Paper W1.2 |
| Status: | Published |
| Publisher: | Institute of Electrical and Electronics Engineers |
| URI: | http://eprints.soton.ac.uk/id/eprint/77365 |
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