상세정보
학술지
An OCDMA Scheme to Reduce Multiple Access Interference and Enhance Performance for Optical Subscriber Access Networks
- 발행일
- 200402
- 출처
- ETRI Journal, v.26 no.1, pp.13-20
- ISSN
- 1225-6463
- 출판사
- 한국전자통신연구원 (ETRI)
- 협약과제
- 03MT1100, 초고속 광가입자망 기술개발, 양재우
- 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.
- KSP 제안 키워드
- Bit-error-rate(BER), Bragg grating(FBG), Broadband light source(BLS), Code division Multiple Access(CDMA), Enhance performance, Multiple access interference(MAI), Numerical Analysis, OCDMA system, On-off, PN code, Signature sequence
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