Study of all-optical header replacement for optical ATM

为了构建全光路由系统，研究了一种以全光方式工作的报头替换电路。该设计一直采用计算机模拟的方法，以头替换电路中使用的器件特性为参数，观察到头替换电路在不同参数条件下的成功运行。功率和透过率依赖被认为是第一种方法。电路的时间相关性，包括响应时间、比特周期和脉冲宽度的相关性被认为是第二种方法，报头替换电路正确运行面临的主要问题是开关器件的长下降时间。在10ps比特周期(对应于100Gbit/S的数据传输速率)的情况下，5ps的下降时间是电路成功低差错操作的极限。在观察电路输出性能的基础上，通过对光电探测器特性和光电探测器中噪声的简化建模，计算了电路的误码性能：在输出偏差接近14%，归一化噪声方差为0.06时，误码率可达到10^~lt；-9~gt；。在归一化噪声方差为0.07的情况下，获得了相同的误码率，误差为8%。同时，制作了可用于OTDM数据解复用的全光开关，验证了其可行性。

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.