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Performance enhancement using the bipolar capacity of bipolar coded fiber Bragg gratings and balanced detection in the spectral encoded code-division-multiple-access systems |
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| Authors: | Sangjo Park Bong Kyu Kim Chang-Soo Park |
| Affiliation: | a School of Computer, Information and Communication, Seowon University, 231 Mochung-dong, Hungduk-gu, Cheongju, Chungbuk 361-742, Republic of Korea b AON Team, Electronics and Telecommunications Research Institute (ETRI), 161 Gajong-dong, Yusong-gu, Daejon 305-350, Republic of Korea c Department of Information and Communications, Kwangju Institute of Science and Technology (K-JIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea |
| Abstract: | This paper proposes a performance-enhanced code-division-multiple-access (CDMA) system using modified pseudorandom noise (PN) coded fiber Bragg gratings (FBGs) with a bipolar optical CDMA encoder/decoder. The data were encoded either by a unipolar signature sequence of modified PN code or by its complement, depending on whether the data bit was ‘1’ or ‘0’. Numerical simulation confirmed that bit error rate (BER) performance largely improved due to the increased decision margin at the receiver. Furthermore, at the BER of 10−9, the tolerance of spectral power distortion in the optical source appeared to be nearly twice that of conventional optical CDMA systems. |
| Keywords: | Fiber Bragg grating Pseudorandom noise code Optical code division multiple access Multiple access interference Bipolar encoder/decoder |
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