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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2510.18823 |
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| _version_ | 1866915567925985280 |
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| author | Rodriguez-Guillen, Daniel Wiechers, Carlos Velazquez-Ibarra, Lorena |
| author_facet | Rodriguez-Guillen, Daniel Wiechers, Carlos Velazquez-Ibarra, Lorena |
| contents | We introduce a topological photonic-crystal fiber that embeds a short Su-Schrieffer-Heeger (SSH) chain and supports two edge supermodes. Using full-vector modal analysis and a coupled generalized nonlinear Schroedinger equation, we show that each supermode provides an independent nonlinear channel with a distinct broadening mechanism: the even supermode features two zero-dispersion wavelengths and yields degenerate four-wave mixing sidebands, whereas the odd supermode is all-normal-dispersion and generates a smooth, flat ANDi-type continuum. Exciting a single core prepares a coherent superposition of the two supermodes; cross-phase modulation and inter-parity four-wave mixing then enable energy transfer across detunings inaccessible to either mode alone, producing the broadest and flattest spectrum with new short wavelengths components. Our results establish topology-enabled modal control as a scalable knob for engineering supercontinuum generation in short SSH topological fibers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_18823 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Supercontinuum generation from Topological Edge Supermodes in a short SSH Photonic Crystal Fiber Rodriguez-Guillen, Daniel Wiechers, Carlos Velazquez-Ibarra, Lorena Optics We introduce a topological photonic-crystal fiber that embeds a short Su-Schrieffer-Heeger (SSH) chain and supports two edge supermodes. Using full-vector modal analysis and a coupled generalized nonlinear Schroedinger equation, we show that each supermode provides an independent nonlinear channel with a distinct broadening mechanism: the even supermode features two zero-dispersion wavelengths and yields degenerate four-wave mixing sidebands, whereas the odd supermode is all-normal-dispersion and generates a smooth, flat ANDi-type continuum. Exciting a single core prepares a coherent superposition of the two supermodes; cross-phase modulation and inter-parity four-wave mixing then enable energy transfer across detunings inaccessible to either mode alone, producing the broadest and flattest spectrum with new short wavelengths components. Our results establish topology-enabled modal control as a scalable knob for engineering supercontinuum generation in short SSH topological fibers. |
| title | Supercontinuum generation from Topological Edge Supermodes in a short SSH Photonic Crystal Fiber |
| topic | Optics |
| url | https://arxiv.org/abs/2510.18823 |