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A grating-based OCDMA coding:decoding system incorporating a nonlinear optical loop mirror for improved code recognition and noise reduction

A grating-based OCDMA coding:decoding system incorporating a nonlinear optical loop mirror for improved code recognition and noise reduction
A grating-based OCDMA coding:decoding system incorporating a nonlinear optical loop mirror for improved code recognition and noise reduction
We demonstrate an elementary grating-based optical code division multiple access (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 (SNR) relative to simple matched filtering alone, and reduced intra- and interchannel interference noise due to code overlap. The system benefits of using the NOLM are experimentally demonstrated under both single- and multiuser operation within a variety of seven- and 63-chip 160-Gchip/s code generation, recognition, and transmission experiments based on the use of bipolar superstructure fiber Bragg grating (SSFBG) coding-decoding pairs. Incorporation of the NOLM is shown to allow error-free penalty-free operation at data rates as high as 2.5 Gb/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
0733-8724
36-46
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.
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. (2002) A grating-based OCDMA coding:decoding system incorporating a nonlinear optical loop mirror for improved code recognition and noise reduction. IEEE Journal of Lightwave Technology, 20 (1), 36-46. (doi:10.1109/50.974816).

Record type: Article

Abstract

We demonstrate an elementary grating-based optical code division multiple access (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 (SNR) relative to simple matched filtering alone, and reduced intra- and interchannel interference noise due to code overlap. The system benefits of using the NOLM are experimentally demonstrated under both single- and multiuser operation within a variety of seven- and 63-chip 160-Gchip/s code generation, recognition, and transmission experiments based on the use of bipolar superstructure fiber Bragg grating (SSFBG) coding-decoding pairs. Incorporation of the NOLM is shown to allow error-free penalty-free operation at data rates as high as 2.5 Gb/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

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Published date: 2002
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 13790
URI: https://eprints.soton.ac.uk/id/eprint/13790
ISSN: 0733-8724
PURE UUID: a0699764-279f-4255-9412-630749311f9b
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: 06 Jan 2005
Last modified: 10 Dec 2019 01:57

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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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