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  4. Coupling between multimode fibers and slab waveguides
 
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Coupling between multimode fibers and slab waveguides

Publikationstyp
Journal Article
Date Issued
2018-11-12
Sprache
English
Author(s)
Fohrmann, Lena Simone  
Pitruzzello, Giampaolo  
Petrov, Alexander  orcid-logo
Eich, Manfred  
Institut
Optische und Elektronische Materialien E-12  
TORE-URI
http://hdl.handle.net/11420/3110
Journal
Optics express  
Volume
26
Issue
23
Start Page
30255
End Page
30266
Citation
Optics Express 23 (26): 30255-30266 (2018-11-12)
Publisher DOI
10.1364/OE.26.030255
Scopus ID
2-s2.0-85057087203
In guided-wave optics, using gratings to couple between single mode waveguides and single mode fibers and vice versa is well-established. In contrast, the coupling between multimode waveguides is more complex and a much less understood topic, even though multimode coupling is essential for the excitation of guided modes from spatially incoherent sources or for the extraction of spatially incoherent radiation from a guided-wave platform. Here, we present the design for a grating that couples multiple modes of a 2D slab waveguide into a multimode fiber and vice versa and discuss the corresponding challenges. We highlight the importance of matching mode numbers and scattering angles and show that the coupling efficiency can readily drop to low values. We present a rudimentary design that illustrates the key issues by demonstrating the coupling from a multimode fiber into a waveguide slab and back into another fiber, which achieves a total efficiency of −34 dB. By modeling the same geometry, we achieve good agreement, which allows us to explain the physics of the coupler and to suggest improvements. Future options are discussed to improve the coupling elements with a better directivity in order to achieve a maximal coupling efficiency. Our findings can be exploited for improving the multimode light injection into and out of integrated guided-wave optical systems.
DDC Class
620: Ingenieurwissenschaften
Funding(s)
Open Access Publizieren 2018 - 2019 / TU Hamburg  
Mid infrared gas sensing  
TUHH
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