Multimode optic device

摘要: Disclosed is a solid state apparatus for and method of (1) modulating the intensity multimode light beam; (2) coupling beam to an input optic fiber that butt coupled diffraction grating formed plurality stripe domains in magnetic film; (3) altering, by application suitable fields, angular orientation plane film, (4) multiplexing diffracted selected one several output fibers. The uses liquid-phase epitaxially (LPE) grown film bismuth substituted rare earth iron garnet form magnetizable layer which may be generated, sustained moved about. grating. altered external fields -- see E. J. Torok, et al, U.S. Pat. No. 3,752,562 alter angle from emitted or rotated are, turn, utilized direction deflected into, along out fibers are oriented surface inverted cone, cone aligned, its longitudinal axis, with axis fiber.