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提出了一种基于平行排列3×3耦合器的双环结构全光缓存器(DLOB)的级联方案,分析了单级和级联结构的缓存原理及读写方式,通过分析半导体光放大器(SOA)的噪声性能,得到光缓存器输出性能主要由读写操作阶段注入的控制光功率及SOA的工作电流决定的结论,提出了在反馈式光缓存器中实现单级多圈和多级缓存的可能性,并搭建了一个两级的缓存系统,实验验证两级级联各缓存9圈时,输出信号光的功率几乎没有减少,信噪比(SNR)下降不到4 dB。理论分析和实验都表明,级联型光缓存器能够实现从纳秒级到毫秒级的缓存,可以满足未来光包交换(OPS)发展的需要。
A cascade scheme of DLOB based on 3 × 3 couplers arranged in parallel is proposed. The principle of buffer and the way of reading and writing of single-stage and cascaded structures are analyzed. By analyzing the advantages of the semiconductor optical amplifier (SOA) ), The output performance of the optical buffer is mainly determined by the control optical power injected into the read-write operation phase and the operating current of the SOA. A single-stage multi-turn and multi-level buffer are proposed in the feedback optical buffer Possibility and set up a two-level buffer system. When the two cascaded cascades are cached for 9 turns, the power of the output signal light is hardly reduced and the signal-to-noise ratio (SNR) is reduced by less than 4 dB. Both theoretical analysis and experiments show that the cascaded optical buffer can buffer from nanosecond to millisecond and meet the requirements of the development of optical packet switching (OPS) in the future.