Thermo-optic tunable optical filters with GHz-bandwidth and flat-top passband on thin film lithium niobate platform

被引：21

作者：

Ding, Yuedi ^{[1
]}

Tao, Shiqi ^{[1
]}

Wang, Xuanhao ^{[1
]}

Shang, Chenglin ^{[1
]}

Pan, An ^{[1
]}

Zeng, Cheng ^{[1
]}

Xia, Jinsong ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Wuhan Natl Laboratoty Optoelect, Wuhan 430074, Peoples R China

来源：

OPTICS EXPRESS | 2022年 / 30卷 / 12期

基金：

中国国家自然科学基金;

关键词：

CONVERSION; EFFICIENCY;

D O I：

10.1364/OE.458218

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Lithium niobate on insulator (LNOI) is a new photonic integrated platform that provides high optical confinement and retains the inherent excellent properties of lithium niobate (LN). Minable filters are one of the indispensable devices for integrated optics. Here we design and fabricate a thermo-optic (TO) tunable optical filter using two cascaded racetrack microring resonators (MRRs) based on LNOI. The filter shows a narrow and flat top passband with infra band ripple less than 0.3 dB, 3 dB bandwidth of 4.8 GHz and out-of-band rejection of about 35 dB. The insertion loss of the filter is about -14 dB, including grating coupling loss about -6.5 dB and on-chip loss less than -1 dB. The heating power fbr center wavelength shift of the filter is about 89.4 mW per free spectral range (FSR). Relevant applications of such filters include optical information processing and microwave photonics.(C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

引用

页码：22135 / 22142

页数：8

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