Puniu Technology was founded in 2018 as a high-end equipment manufacturing enterprise specializing in technology transfer from industry, academia and research at Shanghai Jiao Tong University. Based on the TGD-OFDR scheme, relying on innovative optical path structure and digital signal processing technology, we have successfully developed a high-precision distributed fiber optic acoustic sensing system (HiFi-DAS), comprehensively enhancing core performance metrics such as sensing distance, spatial resolution, strain sensitivity and response bandwidth.