Optical Packet Switching Technology Research, The Fp-soa-based All-optical Signal Processing

In the recent development of optical network, the limit of the O/E (E/O) processing capability in the existed network nodes has been the bottleneck to further improve the bandwidth of the network. Optical Packet Switch (OPS) is introduced to solve this problem. For realizing the all-optical packet switch in deed, the research of all-optical signal processing is quite urgent. Comparing to the Erbium-Doped Fiber Amplifier (EDFA), Semiconductor Optical Amplifier (SOA) has the advantage of small size, low power consumption and the possibility of integration. Since the Fabry-Perot Semiconductor Optical Amplifier (FP-SOA) has some special gain characteristics and is adapted to be used in the all-optical signal technology, the speciality of the FP-SOA and the all-optical signal processing technology in use of the FP-SOA in the optical packet switch network is investigated in this dissertation. The main research works are as follows:1) Based on the carrier rate equation of SOA and the traveling-wave equation for signal wave in SOA, the numerical model of FP-SOA is established with the method of fragment model and the method of resolving the equations by the matrix; The relationship of the gain and carrier density and the connection of the gain and wavelength are derived from the simulation on the FP-SOA model.2) A novel scheme to realize the label and payload separation based on the gain property of FP-SOA is proposed, which mainly utilizes the difference of the pulse width of the label and the payload to implement the different gain. Two specific schemes are given and their performances are optimized to some extent. In the first scheme, label abstraction and erasion can be realized with the contrast ratio of 9.5dB and 6.25dB; in the second scheme, label abstraction and erasion can be realized with the contrast ratio of 10.55dB and 6.45dB.3) A novel scheme of all-optical AND gate based on the gain property of FP-SOA is proposed, which mainly utilizes the relationship of gain and carrier density in FP-SOA. The feasibility of the scheme is further investigated and we find that the AND gate will present different output result when input signals are in different input pattern combination. The effect of the input signal parameters on the system performance is also discussed. This AND gate scheme adopt the all-optical way which avoids the bottleneck of electro-optic conversion, only needs one FP-SOA device, has simple principle and is easy to implement.