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The use of nonlinear element for signal enhancement in a grating based all-optical pattern recognition system

The use of nonlinear element for signal enhancement in a grating based all-optical pattern recognition system
The use of nonlinear element for signal enhancement in a grating based all-optical pattern recognition system
We demonstrate an elementary grating-based OCDMA code generation and - recognition system incorporating a nonlinear optical loop mirror (NOLM) within the receiver. We show that the NOLM can act as a nonlinear processing element capable of reducing both the pedestal associated with conventional matched-filtering, and the width of the associated code-recognition pulse. The pedestal rejection allows for an improved code recognition signal to noise ratio relative to simple matched filtering alone and reduced intra- and inter-channel interference noise due to code overlap. The system benefits of using the NOLM are experimentally demonstrated under both single and multi user operation within a variety of both 7- and 63-chip, 160 Gchip/s code generation, recognition and transmission experiments based on the use of bipolar SSFBG coding:decoding pairs. Incorporation of the NOLM is shown to allow error-free, penalty free operation at data rates as high as 2.5Gbit/s under single user operation, and to provide error-free performance with reduced power penalty in two-user experiments. The narrowed pulse recognition signature offers major advantages in terms of the further all-optical processing of decoded signals, such as code regeneration and recoding. In our experiments we used a fibre based NOLM however, semiconductor based nonlinear devices should offer similar benefits.
Lee, J.H.
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Teh, P.C.
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Petropoulos, P.
522b02cc-9f3f-468e-bca5-e9f58cc9cad7
Ibsen, M.
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Richardson, D.J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Lee, J.H.
3b88784a-02e7-4b63-b112-3fdb4e1abf4e
Teh, P.C.
1e229dd3-3374-4599-b220-be515ac1ed51
Petropoulos, P.
522b02cc-9f3f-468e-bca5-e9f58cc9cad7
Ibsen, M.
22e58138-5ce9-4bed-87e1-735c91f8f3b9
Richardson, D.J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3

Lee, J.H., Teh, P.C., Petropoulos, P., Ibsen, M. and Richardson, D.J. (2001) The use of nonlinear element for signal enhancement in a grating based all-optical pattern recognition system. Rank Prize Fund Mini-Symposium: Terabit Optical Networks. 02 - 05 Apr 2001.

Record type: Conference or Workshop Item (Paper)

Abstract

We demonstrate an elementary grating-based OCDMA code generation and - recognition system incorporating a nonlinear optical loop mirror (NOLM) within the receiver. We show that the NOLM can act as a nonlinear processing element capable of reducing both the pedestal associated with conventional matched-filtering, and the width of the associated code-recognition pulse. The pedestal rejection allows for an improved code recognition signal to noise ratio relative to simple matched filtering alone and reduced intra- and inter-channel interference noise due to code overlap. The system benefits of using the NOLM are experimentally demonstrated under both single and multi user operation within a variety of both 7- and 63-chip, 160 Gchip/s code generation, recognition and transmission experiments based on the use of bipolar SSFBG coding:decoding pairs. Incorporation of the NOLM is shown to allow error-free, penalty free operation at data rates as high as 2.5Gbit/s under single user operation, and to provide error-free performance with reduced power penalty in two-user experiments. The narrowed pulse recognition signature offers major advantages in terms of the further all-optical processing of decoded signals, such as code regeneration and recoding. In our experiments we used a fibre based NOLM however, semiconductor based nonlinear devices should offer similar benefits.

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Published date: 2001
Venue - Dates: Rank Prize Fund Mini-Symposium: Terabit Optical Networks, 2001-04-02 - 2001-04-05

Identifiers

Local EPrints ID: 17149
URI: https://eprints.soton.ac.uk/id/eprint/17149
PURE UUID: d553190a-fa6e-4686-a45b-27a4e9edeb92
ORCID for P. Petropoulos: ORCID iD orcid.org/0000-0002-1576-8034
ORCID for D.J. Richardson: ORCID iD orcid.org/0000-0002-7751-1058

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Date deposited: 15 Sep 2005
Last modified: 06 Mar 2019 01:37

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Contributors

Author: J.H. Lee
Author: P.C. Teh
Author: P. Petropoulos ORCID iD
Author: M. Ibsen
Author: D.J. Richardson ORCID iD

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