Source light effects in optical fiber output beam imaging

In this paper the output beam images and intensity profiles of an optical fiber are investigated by imaging tech- nique. Different experiments are performed for the given fiber and captured images for the white LED and red LED sources are compared. The real-time images are investigated for two types of light sources and major differences are discussed. The effect of the light source frequency bandwidth on image formation is also investigated and obtained image patterns are discussed in detail. The resulting field intensity distributions and their relative changes with re- spect to the illumination source are examined and the role of fiber parameters in image cross sections is discussed. Two major differences are observed in terms of base width and FWHM bandwidth of the intensity curves for white and red LED lights. The white light LED source intensity curve shows a wider bandwidth in comparison with the red light LED intensity profile for the same fiber transmissions.