Journal
JOURNAL OF OPTICS
Volume 20, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2040-8986/aaaa39
Keywords
multi-mode interference device; optical fibers; spatial division multiplexing; optical sensors
Categories
Funding
- BMBF project 'Meta-ZiK Astrooptics' [03Z22A511]
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Three-dimensional multi-mode interference devices are demonstrated using a single-mode fiber (SMF) center-spliced to a section of polygon-shaped core multimode fiber (MMF). This simple structure can effectively generate well-localized self-focusing spots that match to the layout of a chosen multi-core fiber (MCF) as a launcher device. An optimized hexagon-core MMF can provide efficient coupling from a SMF to a 7-core MCF with an insertion loss of 0.6 dB and a power imbalance of 0.5 dB, while a square-core MMF can form a self-imaging pattern with symmetrically distributed 2 x 2, 3 x 3 or 4 x 4 spots. These spots can be directly received by a two-dimensional detector array. The device can work as a vector curvature sensor by comparing the relative power among the spots with a resolution of similar to 0.1 degrees over a 1.8 mm-long MMF.
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