A method of measuring the complex modulation of a Bragg grating is derived from a one-dimensional model of light propagating in an optical fiber. Interference fringes between the Bragg grating and a reference air-gap reflector are measured, and a Fourier transform of the interference fringes generated as a laser is swept through the wavelength is used to compute the complex modulation function of the Bragg grating over a restricted domain. Supporting data, taken by temperature tuning a distributed feedback diode laser, are shown.
© 1996 Optical Society of America
Mark Froggatt, "Distributed measurement of the complex modulation of a photoinduced Bragg grating in an optical fiber," Appl. Opt. 35, 5162-5164 (1996)