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13 March 2024 Mode rejection and counter-propagating all-optical gratings in multimode waveguides
Kunhao Ji, Ian Davidson, Jayanta Sahu, David J. Richardson, Stefan Wabnitz, Massimiliano Guasoni
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Proceedings Volume PC12871, Laser Resonators, Microresonators, and Beam Control XXVI; PC128710H (2024) https://doi.org/10.1117/12.2692091
Event: SPIE LASE, 2024, San Francisco, California, United States
Abstract
In this report, we demonstrate two novel fundamental notions in the counter-propagating nonlinear interaction scheme, namely mode rejection and all-optical gratings. We consider a probe Forward Signal (FS) and a counter-propagating Backward Control Beam (BCB) that are launched at the opposite ends of a multimode and multicore fibre. When both the FS and the CB are in a strong nonlinear regime, a FS with arbitrary modal state undergoes the suppression of a specific spatial mode that is fixed by the CB, which we name mode rejection. When the FS and the CB are respectively in a weak and a strong nonlinear regime, the CB plays the role of an all-optical grating for the FS. This dynamic is exploited to achieve key-all optical operations for the multimode platform, including tunable power splitting, power combining, and power switching.
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Kunhao Ji, Ian Davidson, Jayanta Sahu, David J. Richardson, Stefan Wabnitz, and Massimiliano Guasoni "Mode rejection and counter-propagating all-optical gratings in multimode waveguides", Proc. SPIE PC12871, Laser Resonators, Microresonators, and Beam Control XXVI, PC128710H (13 March 2024); https://doi.org/10.1117/12.2692091
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KEYWORDS
Optical gratings
Waveguides
Beam controllers
Multicore fiber
Optical fibers
Polarization
Photonic integrated circuits
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