摘要
光学环腔因其高Q值的优点,在光传感及光通信领域有着重要的作用。品质因数(Q)是描述光学环腔性能的最重要参数。文中以提高Q值为出发点,重点研究硅基跑道型光学环腔中波导的间距与耦合系数的关系,以及自耦合和损耗因子对Q值的影响,并分析了工作在1.55μm波长下的跑道型环腔的Q值。采用有效折射率法,计算出直波导中的单模传输条件,消除了波导中多余峰值对Q值的影响。此外,利用光耦合模理论,通过控制有效耦合长度对耦合因子进行控制,在波导损耗为0.2 db/cm下得到105的Q值,仿真结果和理论计算一致。文中提出的跑道型结构具有较高的Q值,能被有效应用到光传感及光探测领域中。
Due to its advantage of high quality factor （ Q）, the optical ring resonator plays an impor- tant role in the field of optical sensor and optical communications. Q factor is one of the most signifi- cant parameters that describe the performances of the optical ring resonator. In this work, in order to enhance the Q factor of silicon-based racetrack resonator, our research focused on the relationship between the coupling coefficient and the gap of waveguide, as well as the effects of self-coupling and the loss factor on the Q factor. In addition, the Q factor of racetrack resonator working under the wavelength of 1.55μm was investigated and analysed. The single-mode transmission condition of in- put straight waveguide was computed by using the method of effective refraction index, eliminating the effect of redundant peaks on the Q factor in the waveguide. In addition, the coupling mode theo- ry was used to control the effective coupling strength which results in the high Q factor up to 105 with a waveguide loss of 0. 2 db/cm. The simulation results is consistent with theoretical calculations. The results show that the proposed structure has a higher Q factor and could be effectively applied in optical sensing and light detection.
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2013年第2期476-480,共5页
Journal of Guangxi University（Natural Science Edition）
基金
广西自然科学基金资助项目(2012GXNSFBA053164)
广西大学科研基金资助项目(XBZ090951)
关键词
跑道型谐振腔
品质因数
耦合长度
单模
racetrack resonator
quality factor
coupling strength
single-mode
