Since the 21st century, the first generation of M-Z positioning type vibration fiber has appeared，To now the second generation of new Φ-OTDR positioning type vibration fiber derivatives，Experienced more than ten years of technological development changes，The F7 precision positioning vibration fiber equipped with the industry's new Φ-OTDR technology successfully solves the inherent disadvantages of the first generation of products，With the power of scientific and technological innovation，Promote perimeter alarm products to a new level of technology。