ETRI Journal

  • 제26권1호
  • /
  • Pages.13-20
  • /
  • 2004
  • /
  • 1225-6463(pISSN)
  • /
  • 2233-7326(eISSN)
한국전자통신연구원 (Electronics and Telecommunications Research Institute)
권호 표지

An OCDMA Scheme to Reduce Multiple Access Interference and Enhance Performance for Optical Subscriber Access Networks

  • Park, Sang-Jo (Broadband Convergence Network Research Division, ETRI, School of Computer, Information & Communication, Seowon University) ;
  • Kim, Bong-Kyu (Broadband Convergence Network Research Division, ETRI) ;
  • Kim, Byoung-Whi (Broadband Convergence Network Research Division, ETRI)
  • 투고 : 2003.01.08
  • 발행 : 2004.02.29
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초록

We propose a new optical code division multiple access (OCDMA) scheme for reducing multiple access interference (MAI) and enhancing performance for optical subscriber access networks using modified pseudorandom noise (PN)-coded fiber Bragg gratings with bipolar OCDMA decoders. Through the bipolar OCDMA decoder and the modified PN codes, MAI among users is effectively depressed. As the data are encoded either by a unipolar signature sequence of the modified PN code or its complement according to whether the data bit is 1 or 0, the bit error ratio (BER) can be more improved with the same signal to interference plus noise ratio over the conventional on-off shift keying-based OCDMA system. We prove by numerical analysis that the BER of the proposed bipolar OCDMA system is better than the conventional unipolar OCDMA system. We also analyze the spectral power distortion effects of the broadband light source.

키워드

참고문헌

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