{"title":"Four-channel silicon nitride wavelength beam combiners for multi-gas absorption spectroscopy.","authors":"Qing Gao, Xiangeng Wang, Kan Huang, Jincheng Wei, Yanwei Huang, Yanfeng Zhang, Ruijun Wang, Siyuan Yu","doi":"10.1364/OL.558983","DOIUrl":null,"url":null,"abstract":"<p><p>The detection and measurement of multiple trace gases based on the laser absorption spectroscopy technique requires laser sources with wavelength tunability in multiple wave bands. In this Letter, we present an on-chip wavelength beam combiner based on silicon nitride Mach-Zehnder interferometers (MZIs) and a modified multimode interferometer (MMI) structure to multiplex light with different wavelength spacings. An MZI composed of a standard 1 × 2 MMI and 2 × 2 MMI is employed to digitally multiplex two wavelengths within ∼100 nm spacing. The two wave bands with a spacing of a few hundred nanometers are multiplexed by a compact modified MMI structure. The measured insertion losses of all four channels are around 2.5 dB from the 1650 nm wave band to the 2050 nm wave band. A tunable diode laser absorption spectroscopy (TDLAS) measurement of multi-gas is demonstrated using the device as the wavelength beam combiner.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2469-2472"},"PeriodicalIF":3.1000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1364/OL.558983","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
The detection and measurement of multiple trace gases based on the laser absorption spectroscopy technique requires laser sources with wavelength tunability in multiple wave bands. In this Letter, we present an on-chip wavelength beam combiner based on silicon nitride Mach-Zehnder interferometers (MZIs) and a modified multimode interferometer (MMI) structure to multiplex light with different wavelength spacings. An MZI composed of a standard 1 × 2 MMI and 2 × 2 MMI is employed to digitally multiplex two wavelengths within ∼100 nm spacing. The two wave bands with a spacing of a few hundred nanometers are multiplexed by a compact modified MMI structure. The measured insertion losses of all four channels are around 2.5 dB from the 1650 nm wave band to the 2050 nm wave band. A tunable diode laser absorption spectroscopy (TDLAS) measurement of multi-gas is demonstrated using the device as the wavelength beam combiner.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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