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Abstract Digital holographic tomography (DHT) technology is efficiently utilized to measure optical fiber structure profile. A Mach-Zender off-axis holographic interferometer is used to get fiber wavefront, an angular spectrum reconstruction algorithm is applied to obtain optical path difference (OPD) curves. With an adaptive simultaneous algebraic reconstruction technique (ASART), we obtain a fiber refractive index profile and non-circularity. In fiber wavefront measuring, errors are inevitably caused by measurement accuracy and fiber position offset as fiber rotating. In order to improve fiber structure profile reconstruction accuracy, we propose a novel algorithm to eliminate measuring errors of OPD curves including value drift and position drift, which obviously improves the reconstruction quality. With ASART, we analyze the structure parameters of single-mode spun fiber with various spinning pitches, including refractive index profiles and the fiber non-circularity. The results show that as the shortening of fiber spinning pitch, the refractive index dip in the fiber core is deeper and both cladding non-circularity and core non-circularity are less. [ABSTRACT FROM AUTHOR]

Abstract: A simple method for coupling light from a laser diode (LD) to multimode fiber (MMF) by using a compact in-fiber mode adapter, which is constructed with double-cladding fiber is presented, for the first time. Strong cladding-mode resonance across the thin-thickness inner cladding is used to excite the cladding modes. Principle of proposed mode adapter is theoretically investigated and its performances are experimentally verified by measurement results. By comparing the direct connection between LD and MMF, the coupling efficient of transmission power is improved by using our proposed adapter. [Copyright &y& Elsevier]

Abstract: Mobile wireless optical communication system was demonstrated experimentally by using a special solid coupling optical taper. The performance of special solid coupling optical taper and the data transmission performance with 240Mbit/s were investigated on the rectilinear orbit between the mobile terminal and the fixed terminal. The experimental results shown that the scheme used in the mobile wireless optical communication system is reliable and quite simple, which could be widely used in future. [Copyright &y& Elsevier]