Reduction of modal noise due to fiber/photodetector misalignment in SSMF links based on 850 nm VCSELs through a low-cost polymer coupling structure
| Autor: | Jean-Luc Polleux, Catherine Algani, Giovanni Tartarini, Zerihun Gedeb Tegegne, Carlos Viana, Jacopo Nanni |
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| Přispěvatelé: | Nanni J., Viana C., Tegegne Z.G., Tartarini G., Algani C., Polleux J.-L. |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Coupling
Materials science business.industry Detector Photodetector Physics::Optics Optical power Noise (electronics) Atomic and Molecular Physics and Optics Cutoff frequency Vertical-cavity surface-emitting laser Optics Modal Vertical Cavity Surface Emitting Laser 850nm optical link on single mode fiber Electrical and Electronic Engineering business Engineering (miscellaneous) |
| Popis: | A low-cost polymer-based structure is proposed to improve the coupling between a fiber end section and photodetector active surface in optical links based on standard single-mode fiber (SSMF), which employs vertical cavity surface emitting lasers operating at 850 nm, i.e., below the SSMF cutoff wavelength. Considering receivers as small-area detectors, which are generally necessary to guarantee high-speed operation but at the same time are particularly subject to power fluctuations due to modal noise (whose impact is in turn enhanced in the presence of fiber-to-photodetector misalignment), significant achievements are demonstrated by employing the presented structure. Indeed, in the presence of a misalignment of ± 4 to ± 6 µ m , which is nowadays typically achievable, the relative optical power fluctuations due to modal noise reduce in the presented case more than four times (2.5% from more than 10%) with respect to the case of butt-coupling, which implies an increase of the same factor in the output signal-to-noise ratio at the receiver end. |
| Databáze: | OpenAIRE |
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