Optical fiber


Filament or fiber that is made of thin, transparent glass or synthetic resin and transfers information signal, optical image, or optical energy.

An optical fiber consists of the axial core and the cylindrical clad that surrounds the core. The reflective index of the core is a little greater than that of the clad. When a material of a high reflective index is surrounded with another material of a lower reflective index, light propagates within the inner material of the high reflective index, as is known as the optical waveguide effect, the principle of the optical fiber. Optical fibers are made of quartz, multi-component glass, or methyl methacrylate (MMA) resin by CVD process. Optical fibers are thin, light, flexible, non-induction, efficient, and so on, and are used for transmission of information signals, optical images, and optical energy. The fiber itself is also used as the sensor of temperature, pressure, electric and magnetic fields, and so on. An image fiberscope of an outer diameter of 0.2 mm which is a bundle of 2000 pieces of optical fibers each of which has a diameter of several micrometers has been made. Since the optical fiber can supply high energy to a confined area, it is also used as a laser guide fiber for light driven micro-pumps or for less invasive surgery where the diseased part is irradiated with laser to coagulate the tissue.


[Related Terms]
Image guide, Fiber endoscope, Catheter, Fiber optics sensors