{"title":"铌酸锂薄膜平台上偏光不敏感的90°光学杂化。","authors":"Yuqiong Chen, Haolei Feng, Qianqian Jia, Jianguo Liu, Yujie Lu, Jing Zhang, Jinye Li","doi":"10.1364/OL.559388","DOIUrl":null,"url":null,"abstract":"<p><p>We propose a simple polarization-insensitive 90° optical hybrid on the thin-film lithium niobate (TFLN) platform. The design comprises one 1 × 2 multimode interference (MMI) coupler, three 2 × 2 MMI couplers, and crossing waveguides, effectively reducing the excitation of higher-order modes. By optimizing the length of the 2 × 2 MMI to balance the beat length difference between transverse electric (TE) and transverse magnetic (TM) modes, polarization-insensitive transmission across the entire C-band was achieved. The device exhibits a <5° phase error for TE/TM modes, a <1 dB excess loss, and a >34 dB common-mode rejection ratio (CMRR) over the 1530-1565 nm range. Capable of direct integration with on-chip photodetectors (PDs), this design holds significant potential for applications in coherent receivers integrated with polarization-division multiplexing (PDM).</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 13","pages":"4418-4421"},"PeriodicalIF":3.3000,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Polarization-insensitive 90° optical hybrid on the thin-film lithium niobate platform.\",\"authors\":\"Yuqiong Chen, Haolei Feng, Qianqian Jia, Jianguo Liu, Yujie Lu, Jing Zhang, Jinye Li\",\"doi\":\"10.1364/OL.559388\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>We propose a simple polarization-insensitive 90° optical hybrid on the thin-film lithium niobate (TFLN) platform. The design comprises one 1 × 2 multimode interference (MMI) coupler, three 2 × 2 MMI couplers, and crossing waveguides, effectively reducing the excitation of higher-order modes. By optimizing the length of the 2 × 2 MMI to balance the beat length difference between transverse electric (TE) and transverse magnetic (TM) modes, polarization-insensitive transmission across the entire C-band was achieved. The device exhibits a <5° phase error for TE/TM modes, a <1 dB excess loss, and a >34 dB common-mode rejection ratio (CMRR) over the 1530-1565 nm range. Capable of direct integration with on-chip photodetectors (PDs), this design holds significant potential for applications in coherent receivers integrated with polarization-division multiplexing (PDM).</p>\",\"PeriodicalId\":19540,\"journal\":{\"name\":\"Optics letters\",\"volume\":\"50 13\",\"pages\":\"4418-4421\"},\"PeriodicalIF\":3.3000,\"publicationDate\":\"2025-07-01\",\"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.559388\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1364/OL.559388","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}
Polarization-insensitive 90° optical hybrid on the thin-film lithium niobate platform.
We propose a simple polarization-insensitive 90° optical hybrid on the thin-film lithium niobate (TFLN) platform. The design comprises one 1 × 2 multimode interference (MMI) coupler, three 2 × 2 MMI couplers, and crossing waveguides, effectively reducing the excitation of higher-order modes. By optimizing the length of the 2 × 2 MMI to balance the beat length difference between transverse electric (TE) and transverse magnetic (TM) modes, polarization-insensitive transmission across the entire C-band was achieved. The device exhibits a <5° phase error for TE/TM modes, a <1 dB excess loss, and a >34 dB common-mode rejection ratio (CMRR) over the 1530-1565 nm range. Capable of direct integration with on-chip photodetectors (PDs), this design holds significant potential for applications in coherent receivers integrated with polarization-division multiplexing (PDM).
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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