Polarization splitter rotator on thin film lithium niobate based on multimode interference
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911782861275136 |
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| author | Wang, Mengke Yao, Hao Deng, Jiayao Hu, Zhefeng Tang, Tingting Chen, Kaixin |
| author_facet | Wang, Mengke Yao, Hao Deng, Jiayao Hu, Zhefeng Tang, Tingting Chen, Kaixin |
| contents | Polarization splitter-rotators (PSRs) are the key elements to realize on-chip polarization manipulation. Current PSRs on thin film lithium niobate (TFLN) rely on sub-micron gaps to realize modes separation, which increase the difficulties of lithography and etching. In this paper, a polarization splitter-rotator on TFLN based on multimode interference (MMI) is demonstrated. Mode division is achieved by an MMI-based mode demultiplexer. The feature size of the PSR is 1.5 μm, which can be fabricated with low priced i-line contact aligners. Experimental results show a polarization extinction ratio (PER) > 20 dB and insertion loss (IL) <1.5 dB are achieved in a wavelength range of 1542-1600 nm for TE-polarized light. And a PER > 9.5 dB and an IL <3.0 dB are achieved in a wavelength range of 1561-1600 nm for TM-polarized light. This PSR could find application in the low-cost fabrication of dual-polarization TFLN integrated photonic devices. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_15203 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Polarization splitter rotator on thin film lithium niobate based on multimode interference Wang, Mengke Yao, Hao Deng, Jiayao Hu, Zhefeng Tang, Tingting Chen, Kaixin Optics Applied Physics Polarization splitter-rotators (PSRs) are the key elements to realize on-chip polarization manipulation. Current PSRs on thin film lithium niobate (TFLN) rely on sub-micron gaps to realize modes separation, which increase the difficulties of lithography and etching. In this paper, a polarization splitter-rotator on TFLN based on multimode interference (MMI) is demonstrated. Mode division is achieved by an MMI-based mode demultiplexer. The feature size of the PSR is 1.5 μm, which can be fabricated with low priced i-line contact aligners. Experimental results show a polarization extinction ratio (PER) > 20 dB and insertion loss (IL) <1.5 dB are achieved in a wavelength range of 1542-1600 nm for TE-polarized light. And a PER > 9.5 dB and an IL <3.0 dB are achieved in a wavelength range of 1561-1600 nm for TM-polarized light. This PSR could find application in the low-cost fabrication of dual-polarization TFLN integrated photonic devices. |
| title | Polarization splitter rotator on thin film lithium niobate based on multimode interference |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2402.15203 |