脉冲光源是光码分多址的关键技术之一,光源的性能直接决定了系统的性能。深入研究了光脉冲的啁啾对时域相位光码分多址编解码器性能的影响,分析了啁啾脉冲光源用于光码分多址系统的可行性。基于增益开关分布反馈式脉冲激光器和等效相移光纤光栅编解码器进行了2.5 Gb/s数据速率的60 km光码分多址系统传输实验,得到了误码率低于10-9的实验结果。理论和实验研究结果表明,啁啾脉冲光源可用于光码分多址系统,这对于降低系统的成本,增强光码分多址技术的可实现性有重要意义。

Optical pulse source is one of the key techniques in optical code-division multiple access (OCDMA), and optical source affects the performance of the OCDMA system directly. The pulse chirp’s effect on performance of OCDMA temporal phase en/decoder is researched, and the feasibility of employing optical pulse source with frequency chirp in OCDMA is analyzed. Based on gain-switched distributed feedback (DFB) laser and equivalent phase-shifted superstructured fiber Bragg grating en/decoder, a 60 km OCDMA transmission at the rate of 2.5 Gb/s with bit error rate lower than 10-9 is experimentally demonstrated. The of theoretical analysis and experimental results indicate that the optical pulse source with frequency chirp can be applied in OCDMA system, which is significant for reducing the system cost and enhancing the practicality of OCDMA technology.