A novel architecture of wavelength-division multiplexing/optical code division multiplexing access-passive optical network (WDM/OCDMA-PON) based on superstructure fiber Bragg grating (SSFBG) and wavelength re-modu...A novel architecture of wavelength-division multiplexing/optical code division multiplexing access-passive optical network (WDM/OCDMA-PON) based on superstructure fiber Bragg grating (SSFBG) and wavelength re-modulation technology is proposed. In this scheme, WDM is overlaid on OCDMA channel in a single network by virtue of a kind of SSFBC, and the total capacity of hybrid PON can be extended by regulating the transmission power reasonably. Re, modulation technology is also a good method to save wavelength-specific components at the optical network unit (ONU) and cost of wavelength management on the customer side. In simulation system, 1.25 Gb/s up/downstream data are transported with good performance. In addition the crosstalk penalties from adjacent wavelength channels (with the same OC) are found to be negligible in upstream and downstream transmissions.展开更多
A new kind of two-dimensional optical orthogonal code named ESPC/OCS is constructed,which uses the extend square prime code (ESPC) for time spreading and the one-coincidence sequence(OCS) for wavelength hopping. The p...A new kind of two-dimensional optical orthogonal code named ESPC/OCS is constructed,which uses the extend square prime code (ESPC) for time spreading and the one-coincidence sequence(OCS) for wavelength hopping. The performance of ESPC/OCS is analyzed and the mean value of cross-correlation is deduced. Meanwhile the bit error ratio (BER) for codes is simulated and compared. The simulation results show that given p and q,the BER of ESPC/OCS is reduced,and the capacity is enlarged,when the number of hopping codes p is increased. Given OCS (given q and d),when p is changed,only the capacity is changed,but the BER is almost the same. The performance of ESPC/OCS is better than that of PC/ OCS.展开更多
An electric encoded/optical transmission system of code division multiple access(CDMA)is proposed.It encodes the user signal in electric domain,and transfers the different code slice signals via the different waveleng...An electric encoded/optical transmission system of code division multiple access(CDMA)is proposed.It encodes the user signal in electric domain,and transfers the different code slice signals via the different wavelengths of light.This electric domain encoder/decoder is compared with current traditional encoder/decoder.Four-user modulation/demodulation optical CDMA(OCDMA)system with rate of 2.5 Gbit/s is simulated,which is based on the optical orthogonal code(OCC)designed in our laboratory.The results show that the structure of electric encoding/optical transmission can encode/decode signal correctly,and can achieve the chip rate equal to the user data rate.It can overcome the rate limitation of electronic bottleneck,and bring some potential applications in the electro-optical OCDMA system.展开更多
A construction scheme of variable-weight optical orthogonal codes(VW-OOCs) for asynchronous optical code division multiple access(OCDMA) system is proposed. According to the actual situation, the code family can be ob...A construction scheme of variable-weight optical orthogonal codes(VW-OOCs) for asynchronous optical code division multiple access(OCDMA) system is proposed. According to the actual situation, the code family can be obtained by programming in Matlab with the given code weight and corresponding capacity. The formula of bit error rate(BER) is derived by taking account of the effects of shot noise, avalanche photodiode(APD) bulk, thermal noise and surface leakage currents. The OCDMA system with the VW-OOCs is designed and improved. The study shows that the VW-OOCs have excellent performance of BER. Despite of coming from the same code family or not, the codes with larger weight have lower BER compared with the other codes in the same conditions. By taking simulation, the conclusion is consistent with the analysis of BER in theory. And the ideal eye diagrams are obtained by the optical hard limiter.展开更多
A variable weight address code based on spectrum amplitude coding(SAC)is proposed for optical code division multiple access(OCDMA)networks to support different quality of service(Qo S)requirements of different service...A variable weight address code based on spectrum amplitude coding(SAC)is proposed for optical code division multiple access(OCDMA)networks to support different quality of service(Qo S)requirements of different services.The zero cross-correlation magic square variable weight optical orthogonal code(ZMS-VWOOC)proposed in this paper has great flexibility in terms of code weight and number of users.Zero cross-correlation can eliminate the influence of multiple access interference(MAI)and reduce the system complexity.Numerical results show that ZMS-VWOOC can provide better quality of service than similar codes.Numerical results for a ZMS-VWOOC OCDMA network designed for triple-play services operating at 0.622 Gbit/s,2 Gbit/s,2.5 Gbit/s and 3 Gbit/s are considered.展开更多
基金Project supported by the Shanghai Leading Academic Discipline Project (Grant No.S30108)the Science and Technology Commission of Shanghai Municipality (Grant No.08DZ2231100)
摘要A novel architecture of wavelength-division multiplexing/optical code division multiplexing access-passive optical network (WDM/OCDMA-PON) based on superstructure fiber Bragg grating (SSFBG) and wavelength re-modulation technology is proposed. In this scheme, WDM is overlaid on OCDMA channel in a single network by virtue of a kind of SSFBC, and the total capacity of hybrid PON can be extended by regulating the transmission power reasonably. Re, modulation technology is also a good method to save wavelength-specific components at the optical network unit (ONU) and cost of wavelength management on the customer side. In simulation system, 1.25 Gb/s up/downstream data are transported with good performance. In addition the crosstalk penalties from adjacent wavelength channels (with the same OC) are found to be negligible in upstream and downstream transmissions.
基金supported by the Natural Science Foundation of Jiangsu Province of China ( No. BK2008437)the Natural ScienceFoundation of Jiangsu Higher Education Institutions (No. 07KJB510066)
摘要A new kind of two-dimensional optical orthogonal code named ESPC/OCS is constructed,which uses the extend square prime code (ESPC) for time spreading and the one-coincidence sequence(OCS) for wavelength hopping. The performance of ESPC/OCS is analyzed and the mean value of cross-correlation is deduced. Meanwhile the bit error ratio (BER) for codes is simulated and compared. The simulation results show that given p and q,the BER of ESPC/OCS is reduced,and the capacity is enlarged,when the number of hopping codes p is increased. Given OCS (given q and d),when p is changed,only the capacity is changed,but the BER is almost the same. The performance of ESPC/OCS is better than that of PC/ OCS.
基金supported by the University Nature Science Fund of Guangxi Province(No.20101MS018)Guilin Scientific Research and Technological Development Program Topics(No.20120104-18)
摘要An electric encoded/optical transmission system of code division multiple access(CDMA)is proposed.It encodes the user signal in electric domain,and transfers the different code slice signals via the different wavelengths of light.This electric domain encoder/decoder is compared with current traditional encoder/decoder.Four-user modulation/demodulation optical CDMA(OCDMA)system with rate of 2.5 Gbit/s is simulated,which is based on the optical orthogonal code(OCC)designed in our laboratory.The results show that the structure of electric encoding/optical transmission can encode/decode signal correctly,and can achieve the chip rate equal to the user data rate.It can overcome the rate limitation of electronic bottleneck,and bring some potential applications in the electro-optical OCDMA system.
基金supported by the University Nature Science Fund of Guangxi Province(No.2010 MS018)the Guilin Scientific Research and Technological Development Program Topics(No.20120104-18)
摘要A construction scheme of variable-weight optical orthogonal codes(VW-OOCs) for asynchronous optical code division multiple access(OCDMA) system is proposed. According to the actual situation, the code family can be obtained by programming in Matlab with the given code weight and corresponding capacity. The formula of bit error rate(BER) is derived by taking account of the effects of shot noise, avalanche photodiode(APD) bulk, thermal noise and surface leakage currents. The OCDMA system with the VW-OOCs is designed and improved. The study shows that the VW-OOCs have excellent performance of BER. Despite of coming from the same code family or not, the codes with larger weight have lower BER compared with the other codes in the same conditions. By taking simulation, the conclusion is consistent with the analysis of BER in theory. And the ideal eye diagrams are obtained by the optical hard limiter.
基金supported by the Guangxi S&T Program(Nos.AB17292082 and AB18126025)。
摘要A variable weight address code based on spectrum amplitude coding(SAC)is proposed for optical code division multiple access(OCDMA)networks to support different quality of service(Qo S)requirements of different services.The zero cross-correlation magic square variable weight optical orthogonal code(ZMS-VWOOC)proposed in this paper has great flexibility in terms of code weight and number of users.Zero cross-correlation can eliminate the influence of multiple access interference(MAI)and reduce the system complexity.Numerical results show that ZMS-VWOOC can provide better quality of service than similar codes.Numerical results for a ZMS-VWOOC OCDMA network designed for triple-play services operating at 0.622 Gbit/s,2 Gbit/s,2.5 Gbit/s and 3 Gbit/s are considered.