Sanwa’s passive polarization-maintaining components preserve the polarization state of light from input to output, making them essential wherever signal integrity depends on a stable, aligned optical axis. The line covers PM couplers and splitters, isolators, circulators, WDMs, attenuators, tap monitors, collimators, and patch cords — built on Panda fiber and precision axis-aligned to the connector key. Each device is manufactured for high extinction ratio, low insertion loss, and consistent performance across temperature and wavelength. Typical applications include fiber lasers, fiber optic gyroscopes and interferometric sensing, coherent communications, quantum optics, and test and measurement.