PHASE MODULATOR, PHASE MODULATOR ASSEMBLY, AND PHOTOSENSOR

摘要

An optical sensor which uses a phase modulation method capable of precise measurement as a photodetection means. Using the difference of phase variation of light propagating inside a polarization preserving fiber relative to tensile stress, the polarization preserving fiber suitable for a phase modulator (10), a backlight polarization preserving fiber (23), and a coiled polarization preserving fiber optical element (30) is used, and the optical sensor capable of precise measurement is provided.