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 pedes...

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Bibliographic Details
Main Authors: Lee, J.H (Author), Teh, P.C (Author), Petropoulos, P. (Author), Ibsen, M. (Author), Richardson, D.J (Author)
Format: Article
Language:English
Published: 2002.
Subjects:
Online Access:Get fulltext
LEADER 01878 am a22001693u 4500
001 13790
042 |a dc 
100 1 0 |a Lee, J.H.  |e author 
700 1 0 |a Teh, P.C.  |e author 
700 1 0 |a Petropoulos, P.  |e author 
700 1 0 |a Ibsen, M.  |e author 
700 1 0 |a Richardson, D.J.  |e author 
245 0 0 |a A grating-based OCDMA coding:decoding system incorporating a nonlinear optical loop mirror for improved code recognition and noise reduction 
260 |c 2002. 
856 |z Get fulltext  |u https://eprints.soton.ac.uk/13790/1/13790.pdf 
520 |a 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 
655 7 |a Article