Programmable Light Plugged In All Optical Communication Network Points Multiplexer Poadm System

With the development of information industry, the important status of communations network are increasing significantly. Bandwidth resources are increasingly scarce. So, WDM (Wavelength Division Multiplexing) is emerged. So far, roll-out of the WDM all-optical network make that network structure flexibility is enhanced, resource utilization is improved, and functionality is extended. POADM (Programmable Optical Add/Drop Multiplexer) is the core device in the WDM all-optical network, and it also is the important equipment for the laying of high speed transmission optical networks. Campared with the traditional OADM, the programmable means the wavelength numbers of upload/download are variable. The realization of wavelength programmable function allows more diversity and flexibility in network architecture, and provides a convenient and diversified in optical network. In this paper, we have described how to design a POADM system with function of wavelength add/drop multiplexing, output power control and multi-wavelength programmable control. The primary studies are listed as followed:1. Considering to DWDM system, the OADM technology and variety of technology are introduced in detail. A POADM system architecture design is proposed, and the principle of system is analyzed and discussed.2. According to the optical devices in design of the system, the AWG (Array Waveguide Grating), VOA (Variable Optical Attenuator) and Tap-PD (Photodetector) devices are our focusing. The optical principle and features of them are analyzed. The parameter index of the devices are provided respectively at last.3. The system hardware control circuit has been designed, and a detailed analysis of the whole system controlling circuit function and programs implementation have been demonstrated, including supply voltage step-down circuit, AWG temperature control circuit, VOA drive control circuit and Tap-PD follow-up to the AD conversion circuit.4. Finally, tests and analysis of the whole system function and subsystem optical properties have been done. Tests results and various parameters are obtained. In order to study the express channel and drop channel, two pathways PDL (Polarization Dependent Loss) and ripple are compare respectively. We make a contrast the ACI (Adjacent Channel Isolaton) and Non ACI. The results show that PDL can be controlled in the range of0.25dB-0.70dB. The ACI and NACI are-19.5dB and-28.5dB respectively. In addition, a variety of attenuation of the system and total crosstalk are tested. The total crosstalk can be control at-17dB. Through the tests and analysis, it is confiremed that the system plsys a good performance. It is feasible and applied in all-optical network.