Abstract
A high-resolution distance meter is fabricated using optical waveguide modulators. The modulation frequencies of the optical modulators are around 3.5 GHz, while the modulation frequencies of the optical intensity are around 7 GHz because the modulation bias voltages are set at the peaks of the electrooptic characteristics. The distance meter was evaluated in the National Research Laboratory of Metrology (NRLM) tunnel, which is a semiunderground tunnel. The measurement resolution has a standard deviation of 12 ?m for a distance range of 0.5 to 5 m after correction of the cyclic error.
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