2019武汉光博会 | 微纳光电子高峰论坛，四大报告议程出炉！

报告题目：硅基光子集成芯片

报告时间：11月13日 15:20-15:45

内容大纲：

硅基光子集成因为具有与CMOS工艺兼容的优点，因而成为国内外学术界和产业界共同关注的热点，被认为是数据中心、超级计算机、光网络节点中的器件尺寸、处理速率、系统功耗等瓶颈问题的有效解决途径。

本报告介绍课题组在硅基光子学关键器件和集成芯片方面的工作：研究了光纤与SOI波导的耦合中如何提高耦合效率、减小损耗、减小偏振相关性和简化工艺等问题；研究了锗硅PIN探测器带宽提升和饱和输入功率提升的问题，探索了APD带宽提升的途径；研究了偏振复用和模式复用中的偏振转换、模式转换等关键器件；基于关键器件的研究，成功实现了400 Gb/s硅基集成相干接收机、可实现任意偏振态测量的偏振分析集成芯片以及硅基相控阵芯片。

报告主题：高密度硅光波导集成及光学相控阵等相关应用

报告时间：11月13日 15:50-16:15

报告大纲：

波导超晶格可实现亚波长间距的低串扰、高密度波导集成，在光互连、光学相控阵、激光雷达等领域有应用潜力。高折射率差的硅光波导超晶格中的模式间耦合、毛糙侧壁随机散射与串扰的精确计算需要专门的理论与计算工具。我们将介绍基于波导超晶格的高密度、低串扰波导集成的理论与相关实验，以及利用波导超晶格实现半波长间距的光学相控阵中的相关原理。并介绍在光学相控阵以及相关的热光器件方面的实验与理论进展。

报告主题：Optomechanical Crystal Nanobeam Cavities with Phonon Lasing

报告时间：11月13日 16:30-16:55

报告大纲：

Optomechanical crystals (OM), also known as phoxonic crystals, are combination of photonic and phononic crystals. OM cavity can simultaneously confine light and mechanical motion and results in strong photon-phonon interaction, which provide a new approach to originate and deplete phonons. It is promising for both fundamental science and technological applications, such as mesoscopic quantum mechanics, sensing, transducing, and so on. 

Here, we proposed and demonstrated hetero optomechanical crystals, phonon laser sensing, and simultaneous phonon and photon lasing with the underlying lasing dynamics of optomechanical cavities, etc. Firstly, a new hetero optomechanical crystal was proposed and demonstrated by integrating two types of periodic structures into the system, and the optical and mechanical modes could be confined separately. This separate confinement gave rise to improved properties: a high mechanical frequency (5.9 GHz), and a boost in the coupling rate between the optical and mechanical modes in the cavity (to 1.9 MHz). Secondly, in optomechanical cavities, we showed a very significant result that, for the first time in theory and in practice, simultaneous phonon and photon lasing could occur in optomechanical cavities. The general expressions of the analytical solutions for the lasing linewidth were obtained using terms originating from the pump and thermal noises (Schawlow–Townes limit) for the first time. Lastly, radiation-pressure anti-damping-enhanced optomechanical spring-sensing based on a silicon nanobeam optomechanical structure was proposed and demonstrated, which enables a sensing resolution of δλ/λ0 ∼ 10−7, one order of magnitude larger than that obtained with conventional silicon-based sensors.These results pave the way towards harnessing the coherence of both photons and phonons in silicon photonic devices and reshaping their spectra, potentially opening up new technologies in sensing, metrology, spectroscopy, and signal processing, as well as in applications requiring sources that offer an ultra-high degree of coherence.

报告主题：高速铌酸锂薄膜调制器

报告时间：11月13日 17:00-17:25

报告大纲：

铌酸锂具有优越的电光调制性能，铌酸锂调制器在过去三十多年里在光纤通信系统中发挥了重要的、不可替代的作用。近年由于制备技术的突破，人们利用铌酸锂薄膜材料实现了在尺寸、带宽、驱动电压等重要器件参数上远远优于传统铌酸锂调制器的铌酸锂薄膜电光调制器。本报告将综述国际上在这一领域的最新进展。