Fiber-integrated full-Stokes polarimeter for dual-wavelength operation at 850 nm and 1550 nm

Metalens-based full-Stokes polarimetry represents a significant technology for compact, real-time polarization detection, which have been validated in various polarization measurements. However, research on fiber- integrated polarimeter compatible with multiple communication wavelengths is relatively scarce, which limits the development of polarization detection in the field of optical communication. Here, we propose a fiber- integrated full-Stokes polarimeter compatible with 850 nm and 1550 nm communication wavelengths. By spatial multiplexing scheme, the metalens resting on a fiber tip effectively separates the polarization states of incident light at dual wavelengths. The device obtains the polarization states by reconstructing Stokes parameters from six polarization components across two focal planes. Furthermore, the measurement precision is evaluated by Stokes errors between reconstructed Stokes parameters and theoretical counterparts. For incident light of various selected polarization states, the reconstructed Stokes parameters closely match the theoretical values, with errors all less than 0.05. Hence, the proposed device adds a wavelength dimension while maintaining high polarization detection accuracy, and its integration with fiber greatly enhances the device's integration, offering significant potential for polarization detection, imaging, and optical communication.