Multiple Access Interference Bit Error Rate Evaluation Technique for Direct Detection FFH-OCDMA Bragg Gratings Based Channels

Samuel Nlend, Theo G. Swart

Research output: Contribution to journalArticlepeer-review


This paper proposes a more realistic optical code division multiple access (OCDMA) sequence bit error rate (BER) evaluation technique for multiple access interference (MAI) during transmission over optical fiber. The technique provides a filter for all possible non-zero correlations events that may occur during transmission, leaning on all positive time-frequency intervals for a 2-D OCDMA, or all positive time intervals for 1-D OCDMA. As a wavelength hopping/time sequence (WH/TS) suggests, this MAI evaluation on a 2-D OCDMA consists of one-coincidence frequency hopping code optical orthogonal code (OCFHC-OOC) Bragg gratings encoded signals. For a better assessment of the timeintervals, we also investigate the 1-D OCDMA OOC since the OOC is the time spreading component of the OCFHCOOC sequence. In both cases, the signals of interest are transmitted using simple On-Off keying with non-returnto-zero signalling and direct detection at the receiver. The received signal contains multiple access interference from other users’ coincidence correlations and the inband random correlations from the photodiode due to square detection. The MAI mean and variance are analysed over all possible non-zero wavelength-time interval pairs of sequences and the standard Gaussian approximation is used to evaluate the bit error rate. Further, the resulting bit error rate is then compared with that of the user coincidence-based evaluation technique.

Original languageEnglish
Article number251467
JournalECTI Transactions on Electrical Engineering, Electronics, and Communications
Issue number3
Publication statusPublished - 2023


  • Asymmetric Error Correcting Code
  • Bragg Gratings
  • Fast Frequency Hopping
  • Optical Code Division Multiple Access
  • Optical Orthogonal Code

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


Dive into the research topics of 'Multiple Access Interference Bit Error Rate Evaluation Technique for Direct Detection FFH-OCDMA Bragg Gratings Based Channels'. Together they form a unique fingerprint.

Cite this