Abstract
AbstractA two‐segment lensed fiber collimator using gradient index fiber (GIF) of 140 μm diameter spliced to a coreless fiber (CLF) of 125 μm, and a single mode fiber (SMF) is demonstrated.The CLF and GIF are treated as a beam expander and lens, respectively. The complex beam parameter method and ABCD law are applied for theoretical analysis. Both numerical and experimental data are presented for optical characterization of the divergence angle and insertion loss in lateral and axial displacement of the device. The divergence angle of 1.5 degrees is obtained for the wavelength of 1.31 μm at the GIF length of 180 ± 5 μm and the CLF length of 350 μm. The variation of insertion loss due to lateral and axial displacement shows good agreement with theory. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1846–1848, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25353
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