Frequency-Division Multiplexed Quantum Dot-Polymer Optical Fiber Sensor for Distributed Gesture Recognition

Flexible distributed gesture recognition sensing technology, characterized by its compact structure, simple fabrication process, and multi-node synchronous detection capabilities, demonstrates significant application potential in human-computer interaction, motion tracking, and virtual reality. However, current approaches predominantly rely on redundant multi-sensor array architectures, leading to exponential growth in system complexity and cascaded error accumulation. This study proposes a multi-channel quantum dot (QD)-polymer composite fiber sensing method based on the principle of Frequency Division Multiplexing (FDM). By utilizing photoluminescent QDs doped into the polymer fiber core as the sensitive medium and leveraging their highly tunable excitation wavelengths, a wavelength-orthogonal configuration system is constructed for multiple detection sites within a single channel and across multiple channels. This enables distributed posture recognition based on deformation-induced variations in the optical properties of the polymer. An integrated packaging structure for multi-channel polymer fiber coupling incorporating a single light source/photodetector is developed. Through the synergistic optimization of wavelength-orthogonal configuration and FDM signal processing techniques, multi-point posture recognition is achieved using only a single light source and detector. The system achieved an accuracy exceeding 98% for recognizing 11 typical gestures formed by coordinated multi-finger movements. The proposed FDM fiber sensing strategy significantly reduces the system complexity and recognition errors of flexible distributed posture recognition sensors, providing an innovative solution for next-generation wearable human-computer interaction devices and intelligent motion monitoring systems.