| As key elements in all-optical network, photonics devices in network node are required to be transparent, configurable an integrable to support the increasing growth of data trafific, and therefore attract wordwide attentions. Recently, the monolithic integrated semiconductor ring lasers (SRLs) are considered as one of promising and versatile photonic devices in all-optical networks due to their outstanding merits, such as integrable potential, low power consumption, and they have distinguished nonlinear characteristics. However, the research on the application of SRLs in all-optical network need to be further explored urgently. Under this background, we conduct a deep theoretical and experimental investigation on the characteristics of several key photonics devices in all-optical network i.e. SRLs, OTDM clock recovery module and demultiplexer, and multicast enabling OXC. The work is jointly supported by European Union under the sixth framework program IOLOS project (FP6-2005-IST-5) "Integrated Optical Logic and Memory using Ultra-fast Micro-ring Bistable Semiconductor Lasers", National High Technologies Development Program (863) "Key technologies in 160Gb/s OTDM transmission system using multi-fiber pump" and National Natural Science Foundation "Study on all-optical circuit switching technology". The main achievements are listed as follows.1. The unique characteristics of cavity enhanced four wave mixing (CE-FWM) under injection locking in SRLs are investigated comprehensively. The influence of injected power, wavelength intervals between injected signal and locked main mode, and the wavelength detuning between injected signal and cavity on the power of the generated multi-conjugated singals is given. Detailed comparisons of FWM conversion efficiency between SOA, FP lasers and SRLs are conducted. The deep-in physical explanation of highly efficient simultaneous multi-conjugate signals generation in CE-FWM is provided.2. A multi-mode rate equation model is established which can analyze the characteristics of CE-FWM in monolithic SRLs. the phase and amplitude relationship between multi-conjugate signals is derived using the model. Based on the phase erasing characteristics in even order conjugate signals of CE-FWM, an all-optical modulation format conversion scheme from phase modulated formats (CSRZ,DPSK,MD-RZ etc.) to non-phase modulated formats(RZ etc.) is proposed3. A novel all-optical multicast scheme based on CE-FWM in monolithically integrated SRLs is firstly proposed. By employing an injecting optical signal resonant with a cavity mode of the SRL, one-to-seven all-optical multicast by means of highly efficient simultaneous multi-wavelength conversion is experimentally demonstrated up to multi-gigabit data rates. The scheme offers several advantages including low power penalty, reconfigurability, monolithic integration and low cost. Furthermore,2.5Gb/s all-optical XOR and AND logic, 4Gb/s millimeter-wave generation scheme based on CE-FWM are realized. The experimental results enlarge the scope of SRLs' applications in all-optical network.4. A novel op-electric feedback loop is proposed for achieving clock recovery and 80Gb/s,160Gb/s to 10Gb/s demultiplexing simultaneously. The jitter of recovered clock decreases from 2.4ps to less than 338fs. Based on the loop, error free 16×10Gb/s OTDM 100km transmission is realized with 3dB power penalty at 1×10-9. In addition, the system performance of Terabit Optical Asymmetric Demultiplexer (TOAD) in 80Gb/s OTDM system is analyzed experimentally and theoretically The non-idealities i.e. amplitude jitter, crosstalk and baseline noise are discussed.5. Based on the novel "distributed wavelength-divided and fiber-divided optical circuit switching system" frame, a novel optical layer multicast scheme with improved DaC elements is proposed and realized in our established switching network, which provides a real-time, high quality and low cost multicasting. Video signal and 10Gb/s data signal multicasts are realized.
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