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Multicore fiber becomes 'photonic lantern' filter for telescopes

from Laser Focus News

When fiber Bragg gratings are written into all 120 cores of a multicore optical fiber, great things can happen. Specifically, such an arrangement can become a "photonic lantern" filter that serves as an ultranarrow band line blocker for astronomy. Photonic lanterns couple the functions of single-spatial-mode optical devices (in this case, FBGs) to multimode fiber inputs and outputs. To do this, they combine many single mode fibers together (or in some cases, rely on integrated photonics). Photonic lanterns based on the combination of many single mode fibers with FBGs have been constructed with as many as 61 identical FBGs, with at least one already under test with a telescope. more

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