Simulation Of High-speed Optical Switching Chip System

Optical switch matrix, as the core part of optical switching node, determines the capacity, functionality and performance of optical networks. The silicon chip-based optical switch matrix has the advantages in small size, low power consumption, and has become a hot topic in the field of optical fiber communication. At present, the fabrication of optical switching chip is very expensive, along with long production period. In the case, the simulation process plays a key role in the design of optical switching chip. In this paper, the simulation of high-speed optical switching chip system is studied and the main points are covered as follows:1. An analysis method for the performance of optical switch matrices is put forward by mean of topology information table, which can be applied to a variety of optical switch matrices by changing the topology information table. A topology information table consists of the topological structure information of an optical switch matrix and the transfer matrices of all components. According to any given optical switching request, the configuration states of all optical switches can be determined by the switching and routing tables, which can be obtained by calculating the optical field multicast to the outputs from the input ports. The corresponding output optical field is also used to calculate the performance of the optical switch matrix, including insert loss and optical signal-to-noise ratio. As an example, the 4?4 Benes optical switch is taken into account for and the performance of micro-ring-resonator-based 4?4 optical switching chip is analyzed in the following.2. Taking use of the optical communication simulation software Opti System, the simulation model of the 4?4 optical switching chip and the transmitter and receiver for the high-speed 16 QAM signal are built up. The transmission performance of the optical switching chip consisting of Mach–Zehnder 2×2 optical switch units is studied and the validation of this method is shown by simulation.3. A 2×2 optical switch unit including double micro-ring-resonators is presented as follows: the coupling coefficients are respectively 0.3 or 0.047 between the micro-ring and the straight waveguide or the other micro-ring with the radius of 10μm, and the 2×2 switch unit can operate at the “cross” state for the “zero” voltage. And then, the transmission performance of the resulting 4×4 optical switching chip is simulated and the insert loss and optical signal-to-noise ratio are 2.6d B and 19.8d B, respectively, which are adequate for the 100 Gbps 16QAM signal..