全光交换网的高吞吐量和信道利用率要求全光缓存器具有大的动态延迟范围。建立了基于平行排列3×3光纤耦合器的双环耦合全光缓存器(DLOB)的分析模型。分析了限制DLOB延迟范围的各个因素。分析发现,通过级联DLOB,可以实现大动态延迟范围。实验验证级联型DLOB的可变延迟范围达到1-9999 T,延迟粒度为25 ns,输出信号的误码率低于10-9。得到理论模型与分析方法对其他基于半导体光放大器(SOA)光开关的反馈式光学处理结构同样具有借鉴作用。

Dynamic variable delay range is the very important performance for an optical buffer. This paper establishes an analysis model for the optical buffer of double loop configuration based on collinear 3×3 fiber coupler and analyzes the limiting factors which define the double loop optical buffer (DLOB)′s delay range. Numerical simulations find that a large dynamical variable delay range can be realized by cascading DLOB. The experiment demonstrates that a large delay variation of 1-9999 times of basic delay unit,the fine granularity of 25 ns and the BER of the output data is as low as 10-9. The theory model and analytical method obtained in this paper can also be used to analyze other optical switches based on SOA.