Research On Control Technology For Optical Switching Chips With Micro-Ring Resonators

With the gradual evolution of information and communication networks toward all-optical switching network, large-scale optical switching chip as a key technology has become a hot topic of interest in the field of optical information processing. Achieving optical switching function is dependent on control technology of the high-speed optical switching chip. By analyzing control principle based on micro-ring resonator, the stabilization scheme for micro-ring resonator was put forward and verified by the clock extraction experiments using fiber optical parametric oscillator. The experiment of stably controlling the micro-ring resonator for optical switching chip was accomplished. The main content is listed as follows:1. By analyzing the control characteristics of the PIN and PIP electrodes of micro-ring resonator and the requirement for the control circuits for optical switching chips, and combining with thermo-optic effect and carrier dispersion effect, a new scheme for stabilizing micro-ring resonators was put forward by means of automatic feedback control mechanism in optical power. In consideration of structure similarities between micro-ring resonators and fiber optical parametric oscillator (FOPO), the feasibility of the scheme was verified by clock extraction experiments based on fiber optical parametric oscillator (FOPO).2. By use of four-wave mixing idler as a feedback signal, clock extraction experiment under automatic feedback control was implemented by matching the free spectral range of the cavity with the data rate of the input signal, in which the loop length of fiber optical parametric oscillator (FOPO) was adjusted by fiber optic delay line. In the FOPO experiment, a high-quality optical clock signal of the 0.92ps RMS phase jitter can be extracted from the 12.5Gb/s return-to-zero (RZ) data sequence, and clock extraction accuracy and system stability are improved greatly.3. A driver and temperature control circuit board for optical switching chip was developed, and has played an important role in the 863 project. Based on switching and temperature jitter experiments, the proposed stability scheme of micro-ring resonator was demonstrated. For the input power of-lOdBm at the wavelength of 1553.85nm, the output optical power from the micro-ring resonator can be stabilized at -33±0.1dBm. The experiment is useful for the subsequent research on all-optical signal processing based on micro-ring resonators.