Multimode Bare Optical Fiber 50um 62.5um 105um 200um 300um 400um 600um

Step-Index silica core (QMMF) fibers:

These fibers have a fiber core with a constant index of refraction. Typically the fiber core is fused silica, doped with an element like germanium, while the fiber cladding is typically undoped fused silica for fibers with numerical apertures up to 0.22, and typically a hard polymer for higher numerical apertures. These fibers are available with core sizes ranging from 10 microns to 1500 microns, and NAs ranging from 0.12 to 0.5.

They are also well suited for high power applications as the power is transmitted through a large cross section compared to singlemode or polarization maintaining fibers. The drawback with multimode fibers is that they do not maintain the high quality spatial properties of lasers.

Typically these fibers are suitable either for near infrared and visible wavelengths (IRVIS fi bers) or for near ultraviolet and visible wavelengths (UVVIS fi bers).

UVVIS multimode fibers typically are built with added amounts of hydroxyl (OH) ions added to enhance ultraviolet transmission at the expense of infrared transmission.

Multimode fibers can be further classified as follows:

Graded-Index multimode fibers (MMF):

These fibers have a fiber core with a refractive index that varies from the center to the edge.

They are mainly used for telecommunications applications, and come in three standard core/cladding sizes - 50/125, 62.5/125, and 100/140.

These fibers have a fiber core with a constant index of refraction.

Typically the fiber core is fused silica, doped with an element like germanium, while the fiber cladding is typically undoped fused silica for fibers with numerical apertures up to 0.22, and typically a hard polymer for higher numerical apertures.

These fibers are available with core sizes ranging from 10 microns to 1500 microns,

and NAs ranging from 0.12 to 0.5.