Compensation Of Fiber Lensing Effect During Grating Fabrication In Multicore Fiber

摘要

An arrangement and method that compensates for variation in grating strength associated with forming multiple gratings in multicore fiber is proposed where the writing efficiency of the beam(s) used to form the gratings is controlled to compensate for fiber lensing effects. In one case, a spacing between the multicore optical fiber and the beam source is controlled such that the writing efficiency (which decreases as a function of the space between the source and the fiber) compensates (at least in part) for the increased beam intensity attributed to the lensing effect of the fiber itself. The width of beam itself may also be controlled to modify the writing efficiency.

主权项

1. A method for controlling grating strength created in multiple core regions of a multicore optical fiber, comprising the steps of
providing a beam source for creating interfering and overlapping writing beams forming an interference pattern, an overlapped region defined as an interferogram region, with a number of interference fringes created by the overlapping beams defining a writing efficiency of the beam source; positioning a multicore optical fiber in proximity to the beam source such that the overlapping writing beams pass through a width of the multicore optical fiber; and adjusting the interferogram region to control the writing efficiency of the interferogram and thereby control the strength of gratings created in different core regions of the multicore optical fiber.