Study of all-optical header replacement for optical ATM

以构建全光路由系统为目标，研究了一种以全光方式工作的标头替换电路。本设计一直采用计算机仿真，以引线更换电路中使用的器件特性为参数。在不同的参数条件下，观察到接头更换电路的成功运行。第一种方法是依赖于功率和透射率。第二种方法是考虑电路的时间相关依赖，包括对响应时间、位周期和脉宽的依赖。导联更换电路正确运行所面临的主要问题是开关器件下降时间长。在10ps比特周期（对应于100Gbit/s的数据传输速率）的情况下，5ps的跌落时间是电路成功低错误运行的极限。当透过率变差或响应时间进一步增加时，电路产生的检测误差概率较大。在观察电路输出性能后，利用光电探测器特性和光电探测器噪声的简化建模计算电路的误差性能：在输出偏差接近14%，归一化噪声方差为0.06时，可以实现10^<-9>的误码率。在归一化噪声方差为0.07的情况下，以8%的偏差实现相同的误码率。并制作了用于OTDM数据解复用的全光开关，验证了该方法的可行性。

With the aim of construction all-optical routing system, a header replacement circuit is investigated, that operates in an all-optical manner. The design has been using computer simulation with device characteristics used in the header replacement circuit as parameters.The successful operation of the header replacement circuit has been observed for different parameter conditions. Power and transmittance dependence has been considered as the first approach. Time relate dependence of the circuit, including dependence on response time, bit period and pulse width has been considered as the second approach.The main problem facing the correct operation of the header replacement circuit is the long fall time of the switching devices. In the case of 10ps bit period (corresponding to a data transmission rate of 100Gbit/s), fall time of 5ps was the limit for successful low error operation of the circuit. When the transmittance got worse or response times were increased further, the circuit produced output with high probability of error in detection.After observing circuit output performance, error performance of the circuit was calculated using a simplified modeling for the photodetector characteristics and noise in the photodetecor : At an output deviation of nearly 14% and a normalized noise variance of 0.06, a BER of 10^<-9> could be achieved. The same BER was achieved with a deviation of 8% for a normalized noise variance of 0.07.Also, the all-optical switch, which can be applied for demultiplexing the OTDM data, was fabricated to show its feasibility.