Straight Directional Couplers via Scan-Engineered Index Control
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866913027257794560 |
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| author | Wang, Mohan Booth, Martin J. Salter, Patrick S. |
| author_facet | Wang, Mohan Booth, Martin J. Salter, Patrick S. |
| contents | A novel design for straight directional waveguide couplers and interferometers is demonstrated in glass, fabricated using femtosecond laser direct writing and operating at telecommunication wavelengths (~1550 nm). The devices consisted of parallel waveguides with a spacing of 15 um, where the coupling strength was controlled by scan-engineered refractive index modulation along the length of the waveguide. Using this approach, we realized a 50:50 directional coupler formed by two identical waveguides with a footprint of < 40 um x 15 um x 6 mm, as well as a Mach-Zehnder interferometer with unbalanced arms. A waveguide array with 15 um spacing was also demonstrated, highlighting the potential for compact, high-density, and three-dimensional photonic integration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_12017 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Straight Directional Couplers via Scan-Engineered Index Control Wang, Mohan Booth, Martin J. Salter, Patrick S. Optics A novel design for straight directional waveguide couplers and interferometers is demonstrated in glass, fabricated using femtosecond laser direct writing and operating at telecommunication wavelengths (~1550 nm). The devices consisted of parallel waveguides with a spacing of 15 um, where the coupling strength was controlled by scan-engineered refractive index modulation along the length of the waveguide. Using this approach, we realized a 50:50 directional coupler formed by two identical waveguides with a footprint of < 40 um x 15 um x 6 mm, as well as a Mach-Zehnder interferometer with unbalanced arms. A waveguide array with 15 um spacing was also demonstrated, highlighting the potential for compact, high-density, and three-dimensional photonic integration. |
| title | Straight Directional Couplers via Scan-Engineered Index Control |
| topic | Optics |
| url | https://arxiv.org/abs/2604.12017 |