Recent progress in integrated electro-optic frequency comb generation

• 来源期刊: 半导体学报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: REVIEWS
• 页码范围: 5-16
• 页数: 12页
• 语种: 英文
• DOI: 10.1088/1674-4926/42/4/041301

摘要

Optical frequency combs have emerged as an important tool enabling diverse applications from test-and-measure-ment,including spectroscopy,metrology,precision distance measurement,sensing,as well as optical and microwave wave-form synthesis,signal processing,and communications.Several techniques exist to generate optical frequency combs,such as mode-locked lasers,Kerr micro-resonators,and electro-optic modulation.Important characteristics of optical frequency combs in-clude the number of comb lines,their spacing,spectral shape and/or flatness,and intensity noise.While mode-locked lasers and Kerr micro-resonators can be used to obtain a large number of comb lines compared to electro-optic modulation,the lat-ter provides increased flexibility in tuning the comb spacing.For some applications in optical communications and microwave photonics,a high degree of integration may be more desirable over a very large number of comb lines.In this paper,we re-view recent progress on integrated electro-optic frequency comb generators,including those based on indium phosphide,lithi-um niobate,and silicon photonics.