Abstract

Measurement error for the polarization extinction ratio (PER) of a multifunctional integrated optic chip (MFIOC) utilizing white light interferometry was analyzed. Three influence factors derived from the all-fiber device (or optical circuit) under test were demonstrated to be the main error sources, including: 1) the axis-alignment angle (AA) of the connection point between the extended polarization-maintaining fiber (PMF) and the chip PMF pigtail; 2) the oriented angle (OA) of the linear polarizer; and 3) the birefringence dispersion of PMF and the MFIOC chip. Theoretical calculations and experimental results indicated that by controlling the AA range within $0°\pm 5°$, the OA range within $45°\pm 2°$ and combining with dispersion compensation process, the maximal PER measurement error can be limited to under 1.4 dB, with the $3\sigma$ uncertainty of 0.3 dB. The variations of birefringence dispersion effect versus PMF length were also discussed to further confirm the validity of dispersion compensation. A MFIOC with the PER of $\sim 50\mathrm{dB}$ was experimentally tested, and the total measurement error was calculated to be $\sim 0.7\mathrm{dB}$, which proved the effectiveness of the proposed error reduction methods. We believe that these methods are able to facilitate high-accuracy PER measurement.

© 2017 Optical Society of America

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