采用光硬限幅器和RS码的多波长OCDMA性能分析

Performance Analysis of Multi-wavelength OCDMA Employing Optical Hard-limiters and RS Code

提出了一种采用多个光硬限幅器和RS信道编码的多波长光码多分址(MW OCDMA)系统,理论分析了其误码率和(BER)和归一化吞吐量性能。结果表明,采用光硬限幅器的MW OCDMA系统BER性能将明显改善,进一步采用RS信道编码后,MW OCDMA系统BER性能将大大改善。另一方面,采用光硬限幅器的MW OCDMA系统的归一化吞吐量明显提高,特别是归一化吞吐量峰值提高了约1倍,但进一步采用RS信道编码后,MW OCDMA系统的归一化吞吐量并没有提高,在系统负载量不是很大的情况下还略有下降。

A scheme of multi-wavelength optical code-division multiple-access （MW OCDMA） employing optical hard-limiters and RS code is proposed,and its performances of bit error rate（BER） and normalized throughput are analyzed. Analysis results show that, BER of MW OCDMA system is improved by employing optical hard-limiters,and can be further improved by employing RS code additionally. On the other hand, optical hard-limiters can enhance the normalized throughput of MW OCDMA system, and the peak of normalized throughput will be doubled. However, normalized throughput of MW OCDMA system can＇t be improved by employing RS code additionally. Furthermore, when offered load is not large,normalized throughput of MW OCDMA will be somewhat reduced.