Nondestructive images of refractive-index variation within a type I fiber Bragg grating have been recorded by the differential interference contrast imaging technique. The images reveal detailed structure within the fiber core that is consistent with the formation of Talbot planes in the diffraction pattern behind the phase mask that had been used to fabricate the grating.
© 2003 Optical Society of America
(060.2270) Fiber optics and optical communications : Fiber characterization
(060.2310) Fiber optics and optical communications : Fiber optics
(060.2340) Fiber optics and optical communications : Fiber optics components
Nicoleta M. Dragomir, Claire Rollinson, Scott A. Wade, Andrew J. Stevenson, Stephen F. Collins, Gregory W. Baxter, PeterM. Farrell, and Ann Roberts, "Nondestructive imaging of a type I optical fiber Bragg grating," Opt. Lett. 28, 789-791 (2003)