Signal Loss Aware Waveguide Routing Algorithm for Integrated Optics

• Main Authors: Yi-CianYang, 楊宜蒨
• Other Authors: Tsung-Yi Ho
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/98405636037317863141

碩士 === 國立成功大學 === 醫學資訊研究所 === 102 === Due to the superior nature of light, data transfer from module-to-module/chip- to-chip in photonic integrated circuit (PIC) could be accomplished in a more efficient way. Therefore, integrated optics is regarded as one of the most emerg- ing technologies in next generation and plays an important role in several real- world applications such as telecommunication, information processing, ......, etc. During light propagation, diffraction and refraction may occur because of the impact of waveguide crossing and bending, respectively. Unlike electronic integrated circuits (EIC), PIC lacks the inherent signal restoration capabilities of static-CMOS. Therefore signal loss is unavoidable and is considered as the bottleneck of waveguide routing in PIC. Existing works utilized the inherent sorting-based techniques with some revision to maintain the crossing minimal. Also several constraints are imposed in expection of reducing the number of bending. However, the sorting-based technique with some constraints imposed cannot effectively reduce the signal loss. As a result of the inflexibility of this routing mechanism, the number of sharp bendings may rather increase, which results to more attenuation of transmitted signal accordingly. We develop an Integer Linear programming (ILP) model for waveguide routing algorithm to simultaneously minimize the impact of waveguide crossing, bending, and the number of routing tracks. Moreover, a crossing-driven partitioning approach is adopted to further reduce the time complexity of ILP model. Experimental results show that our proposed approach is very effective on improving both the signal loss and area utilization.