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arXiv 2209.08620physics.optics
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基于耦合波导绝热优化的超宽带集成光学滤波器

Ultra-broadband integrated optical filters based on adiabatic optimization of coupled waveguides

Kazim Gorgulu, Emir Salih Magden

AI总结:

本研究提出一种基于绝热波导优化算法的超宽带硅光子滤波器,通过级联单截止频率滤波器实现带宽超100 nm的带通操作,具有低于1.5 dB插入损耗和超15 dB消光比,为多波段集成光子学应用提供新能力。

摘要:

宽带光谱滤波器在许多集成光子学应用中备受青睐,例如超宽带波分复用、多波段光谱分析和宽带传感。在本研究中,我们展示了一种基于绝热波导的紧凑型超宽带硅光子滤波器的设计、仿真与实验验证。我们首先为耦合绝热波导结构开发了一种优化算法,并利用它来设计独立的单截止频率光谱滤波器。这些单截止频率滤波器是1x2端口器件,能够在指定的器件长度内,将宽带信号最优地分离为短通和长通输出。我们利用绝热参数控制这些滤波器中的功率滚降和消光比。该滤波器的两个输出端口均工作在透射模式下,从而能够以不同配置级联多个滤波器。利用这种灵活性,我们在片上级联了两个具有不同截止波长的滤波器,并实验验证了带通操作。这些带通边缘的独立且灵活的设计使得滤波器的带宽可远超100 nm。在实验中,我们展示了通带范围从6.4 nm至96.6 nm的带通滤波器。我们的器件在短通、带通和长通这三种输出中均实现了平坦带透射,插入损耗低于1.5 dB,消光比超过15 dB。这些超宽带滤波器能够为通信、光谱分析和传感应用中的多波段集成光子学赋予新能力。

英文摘要:

Broadband spectral filters are highly sought-after in many integrated photonics applications such as ultra-broadband wavelength division multiplexing, multi-band spectroscopy, and broadband sensing. In this study, we present the design, simulation, and experimental demonstration of compact and ultra-broadband silicon photonic filters with adiabatic waveguides. We first develop an optimization algorithm for coupled adiabatic waveguide structures, and use it to design individual, single-cutoff spectral filters. These single-cutoff filters are 1x2 port devices that optimally separate a broadband signal into short-pass and long-pass outputs, within a specified device length. We control the power roll-off and extinction ratio in these filters using the adiabaticity parameter. Both outputs of the filters operate in transmission, making it possible to cascade multiple filters in different configurations. Taking advantage of this flexibility, we cascade two filters with different cutoff wavelengths on-chip, and experimentally demonstrate band-pass operation. The independent and flexible design of these band edges enables filters with bandwidths well over 100 nm. Experimentally, we demonstrate band-pass filters with passbands ranging from 6.4 nm up to 96.6 nm. Our devices achieve flat-band transmission in all three of the short-pass, band-pass, and long-pass outputs with less than 1.5 dB insertion loss and extinction ratios of over 15 dB. These ultra-broadband filters can enable new capabilities for multi-band integrated photonics in communications, spectroscopy, and sensing applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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