The Analysis Of Optical Chip-to-chip Interconnect Techniques

In this paper, we address the possible advantages of optical chip-to-chip interconnect techniques deployed in the multiprocessor environment. High-performance computing is desired in many fields of environmental system sciences, and optical chip-to-chip interconnect techniques strengthen the computing performance in the multiprocessor environment. The performance comparison is analyzed and shown in this paper.A bandwidth-limit model is proposed to evaluate the parallel computing performance with n processors in two-dimensional mesh architecture, and also a hypercube architecture model is under investigation. The models include four important parameters:unit processing time (one multiplication and addition operation), communication cost (in time domain), processor number and the transmission time. A parallel computer consists of an ensemble of p processing units each of which runs at the same speed.FFT has parallel structures and is suitable for evaluating parallel system. Taking 65536 points FFT calculation as example, the speedup and efficiency are compared between the traditional electrical interconnect system and the optical chip-to-chip interconnect system we designed quantificationally. Both of these two systems have the same type of processor, unit processing time (one complex multiplication and complex addition operation).80 ns communication cost is considered in the simulation.2.5Gbps per channel is regarded as the electrical transmission rate, and the optical chip-to-chip interconnect rate can reach 6.25Gbps per channel. Also, the relationship between speedup and computing number, together with the relationship between efficiency and computing number, are summarized and analyzed.The simulation results indicate that as the processor number increases, the improvement in speedup will be much more conspicuous, also if the optical chip-to-chip techniques are deployed, the system will have an obvious accelerator ratio gain. According to the efficiency graph, the optical interconnect system also has a higher efficiency. In addition, the speedup and efficiency increase with the computing number both in electrical interconnect system and optical chip-to-chip interconnect system, and the optical chip-to-chip interconnect system always has great advantages compared with the electrical interconnect system. As the most potential technology, optical transmission will be effective in high-performance computing.