The Key Technology Research Of Reconfigurable Optical Add/drop Multiplexer

At present, the dense wavelength division multiplexing(wavelength division multiplexing, DWDM) devices in optical communication are making a tremendous step towards the integration, simplicity, intelligence, miniaturization and high speed. As the key device of DWDM system, reconfigurable optical add/drop multiplexer(ROADM) has been focused by academic researchers in recent years. However, some ROADM devices are not fast enough or highly integrated,and there are very few high-speed integrated ROADM devices which have been applied to practice. Therefore, this paper studied the key technology of ROADM devices based on Fabry- Perot(FP) resonator:(1) The tunable FP array ROADM model based on FP resonator was established. First, the multi-layer dielectric films for the mirrors of FP device were modeled. And then the reflection properties were calculated by above model. Moreover, the model of tunable FP array ROADM based on the FP device was built and its relevant key indicators were also proposed and computed. Finally, the tunable mechanism of FP was theoretically investigated and the mechanism of FP resonant cavity was discussed.(2) The key technology of FP-ROADM device was researched. First, the main performance of the FP cavity was numerically calculated. Second, the main performance of FP-ROADM devices was simulated, the influence of the finite multi-beams interference on the transmittance of the FP was analyzed. The effects effecting on the FP performance was investigated. Finally, the main indicators affected by these defects were also analyzed.(3)The dynamic response of the tunable FP-ROADM was deduced through the experimental study of the cavity length and the transmittance of the FP cavity.(4) A designing scheme of integrated ROADM was proposed, according to the electric induced refractive index effect. A wide free spectral range, narrow bandwidth and low insertion loss FP array architecture on a silicon chip was designed, So, the key issues such as insertion loss, response time and large scale integration were solved. The ROADM array device was optimized, and its performance was significantly improved. Furthermore, the large-scale integration method of FP-ROADM devices was proposed. An 8 channel ROADM devices, with the channel spacing of 100 GHz and the physical port of 16 wavelength channels was simulated. Finally, arbitrary wavelength of the upload/download and direct functions were achieved. In this paper, the design of the tunable FP could be flexibly allocated and easily switched to different wavelength signals, The main characteristics of the device were fast response, simple structure, and the combination of wave, wave filter and optical switches. Overall, the research contents of this paper will provide a theoretical basis for the application of the related reconfigurable optical and sub-multiplexing devices to the practical engineering.