Photodetecting Fiber

Applications

The applications of this fiber device are in optical imaging, industrial monitoring, remote sensing and functional fabrics.

Problem Addressed

The use of fiber as a distributed sensing medium is limited because radiations at optical frequencies are not detected. Therefore, there is a need for fiber for detecting and localizing an incident optical beam without requiring fast electronics or complex detection architectures.

Technology

Photodetecting fibers typically consist of a photo-conductive amorphous chalcogenide glass core in contact with a metal electrode running along its length, which is surrounded by a transparent polymer cladding. These materials are assembled at the preform level and subsequently thermally drawn into uniform functional fibers of potentially hundreds of meters in length. The metallic electrodes form a resistive channel that breaks axial symmetry. The resistive channel has a resistivity between that of metals and the semiconducting core that enables the imposition of non-uniform convex electric potential distributions which allows for the detection of an optical beam along the fiber.

Advantages

  •  It has better performance than traditional detectors.
  •  It provides a easier and quicker way to make optical field measurements