Dynamic RWA algorithm which supports differentiating business service quality levels becomes a hot research in optical networks. This paper proposes a better ant colony algorithm for routing and wavelength assignment in ASON with supporting differentiating SLA of services and 10P bps network capacity. Firstly, the algorithm adds the concept of business interval period M to dynamically adjust the wavelength grouped in different periods So as to better meet the sercice requests of different levels; Secondly the algorithm adds a link selection control factor in the transition probability function ACA in order to achieve a better link load balancing. Simulation results show that after joining the cyclical and link selection control factor, blocking rate becomes lower and the load of network becomes more evenly.

As human society to the information in the process of moving and growing demand for bandwidth communications capacity, the optical of new modulation formats increasingly attention and quickly play an important role in optical communications. How can the system bit error rate within a certain degree of stability while still maintaining high-speed long-distance dispersal system, has been a popular issue is the optical communications industry. Starting from the optical modulation format herein, the generation process of the system introduced various optical signal modulation format, the optical signal through the optical fiber was studied and the performance of the simulation, on the basis of the design of advanced optical modulation formats in an optical fiber communication system .

This paper studies a variable rate optical Orthogonal Frequency Division Multiplexing Passive Optical Network (OFDM-PON) real-time access system model, using the signal processing method of oversampling. The basic principle of the model is that the access system uses different oversampling rates according to the allocated bandwidth to different Optical Network Units (ONUs), ensuring that the entire system can utilize the existing hardware conditions to maximum effect. The proposed system uses Xilinx V5 FPGA to generate real-time OFDM signals. MATLAB software is used to recover the signals and calculate the bit error rate (BER). The simulation results are presented and analyzed to verify the performance of the system.

With the explosive growth of optical network dimensioning [1] and the call of traffic, the network traffic is becoming more and more imbalanced. When some links are busy and have congestion, some others are idle for long time. This paper proposes a theory which simplifies a complex optical network into an equivalent easy one using the bandwidth of the optical link. and we call this theory TDBB. For the large capacity optical switching network node 1000×1000,divided in two level :the ms level 32×32 optical switching and ns level 32×32 using time division multiplexing in subcarrier wave. Every subcarrier [2] has 10G bandwidth. So we have 10T in single wave ,200T in single fiber. 10P capacity of total 50 ports. which is to say this theory can work for TE project in optical switching network which has more than 10pbs large capacity.

Proportional navigation guidance law is widely applied in the terminal guidance of the reentry vehicle. However, the guidance accuracy of the traditional PNG law is largely affected by the wind disturbance. To improve the impact precision, the proposed method applies a feedback of angular velocity deviation to the traditional PNG law. With the proposed method, the vehicle could satisfy the terminal constraints under large wind disturbance. Also, simulation results validate that the proposed method can well enhance the performance of the vehicle.