A scheme of WDM＋ OCDMA system employing optical hard-limiter（OHL） is proposed, and its performance of normalized throughput is analyzed. The upper bound of the normalized throughput is obtained when all the simulta...A scheme of WDM＋ OCDMA system employing optical hard-limiter（OHL） is proposed, and its performance of normalized throughput is analyzed. The upper bound of the normalized throughput is obtained when all the simultaneous users are equally allocated to different wavelength channels. The lower bound of the normalized throughput is obtained when all the simultaneous users are firstly allocated to the same wavelength channels. Compared with the performance of VVDM＋ OCDMA system without OHL, both the upper bound and lower bound of the normalized throughput in WDM ＋ OCDMA system with OHL can be improved.展开更多
The performance of normalized throughput in wavelength division multiplexing （WDM） based coherent time-spreading optical code division multiple access （TS-OCDMA） system is studied. The upper bound and lower bound ...The performance of normalized throughput in wavelength division multiplexing （WDM） based coherent time-spreading optical code division multiple access （TS-OCDMA） system is studied. The upper bound and lower bound of normalized throughput are obtained with 8 wavelength channels and 127-length Gold code, and with 4 wavelength channels and 511-length Gold code respectively. It is shown that when all simultaneous users are equally allocated to different wavelength channels, WDM＋TS-OCDMA has much better performance. However, if there is no central control to allocate wavelength channels equally, WDM＋TS-OCDMA system has the in-between performance of normalized throughput.展开更多
基金This work was supported by National Natural Science Foundationof China(No.60132040) Guangdong Provincial Natural Sci-ence Foundation of China(No.5301028 04300855)
文摘A scheme of WDM＋ OCDMA system employing optical hard-limiter（OHL） is proposed, and its performance of normalized throughput is analyzed. The upper bound of the normalized throughput is obtained when all the simultaneous users are equally allocated to different wavelength channels. The lower bound of the normalized throughput is obtained when all the simultaneous users are firstly allocated to the same wavelength channels. Compared with the performance of VVDM＋ OCDMA system without OHL, both the upper bound and lower bound of the normalized throughput in WDM ＋ OCDMA system with OHL can be improved.
基金supported by the National Natural Science Foundation of China under Grant No. 60772027
文摘The performance of normalized throughput in wavelength division multiplexing （WDM） based coherent time-spreading optical code division multiple access （TS-OCDMA） system is studied. The upper bound and lower bound of normalized throughput are obtained with 8 wavelength channels and 127-length Gold code, and with 4 wavelength channels and 511-length Gold code respectively. It is shown that when all simultaneous users are equally allocated to different wavelength channels, WDM＋TS-OCDMA has much better performance. However, if there is no central control to allocate wavelength channels equally, WDM＋TS-OCDMA system has the in-between performance of normalized throughput.
