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.

[IEEE ]

PDF Article

References

  • View by:
  • |

  1. P. Petropoulos, M. Ibsen, A. D. Ellis and D. J. Richardson, "Rectangular pulse generation based on pulse reshaping using a superstructured fiber Bragg grating", J. Lightwave Technol., vol. 19, pp. 746-752, May 2001.
  2. N. Wada and K. Kitayama, "A 10Gb/s optical code division multiplexing using 8-chip optical bipolar code and coherent detection", J. Lightwave Technol., vol. 17, pp. 1758-1765, Oct. 1999.
  3. P. C. Teh, P. Petropoulos, M. Ibsen and D. J. Richardson, "A comparative study of the performance of seven-and 63-chip optical code-division multiple-access encoders and decoders based on superstructured fiber Bragg gratings", J. Lightwave Technol., vol. 19, pp. 1352-1365, Sept. 2001.
  4. H. P. Sardesai, C.-C. Chang and A. M. Weiner, "A femtosecond code-division multiple access communication system test bed", J. Lightwave Technol., vol. 16, pp. 1953-1964, Nov. 1998.
  5. B.-E. Olsson and P. A. Andrekson, "Noise filtering with the nonlinear optical loop mirror", J. Lightwave Technol., vol. 13, pp. 213-215, Feb. 1995 .

Cited By

OSA participates in Crossref's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.