Fiber-optic detectors are devices used in fiber-optic cables to detect and measure light signals. These detectors are typically photodiodes, which are semiconductor devices that generate an electrical signal when illuminated by light. The photodiodes are connected to the fiber-optic cable in order to detect the light signals that travel along the cable.

The fiber-optic cable is made up of several strands of glass or plastic that are arranged in a cladding layer. This layer acts to protect the strands from external sources of light and thus helps to ensure that the signal is not lost or distorted. The fiber-optic cable is usually surrounded by an outer casing that further prevents any outside light from interfering with the signal.

When a light signal enters the fiber-optic cable, it is converted into an electrical signal by the photodiode. This signal is then sent through the cable to the destination device. The electrical signal is then converted back into a light signal and sent to the desired device.

Fiber-optic detectors are used in many applications including telecommunications, medical imaging, and communication networks. Their ability to detect and measure light signals with high accuracy and precision makes them an essential component of many systems. Furthermore, their small size and low power consumption make them ideal for use in a variety of applications.