Fiber Cable Manufacturer
1-288 cores GYFTY non-metallic Optical Fiber Cable
Central strength member
Vary from 7 to 14mm
aerial or duct cable networking system
1/2/3/4/5km km each exporting wooden drums
Learn more about fiber optical cable:
When Do You Use Them ?
Obviously, if you are working in the laboratory measuring fiber attenuation using a lamp source and monochrometer, you probably need a combination of all of the above. If you are using a LED or laser source, you might not need any of them, since they greatly underfill the higher order modes. LEDs and lasers also are the same mode fill as actual system sources, providing a proper simulation of actual operating conditions without mode modifiers of any kind.
Testing SM Fiber
Testing single mode fiber is easy compared to multimode fiber. Singlemode fiber, as the name says, only supports one mode of transmission for wavelengths greater than the cutoff wavelength of the fiber. Thus most problems associated with mode power distribution are no longer a factor. However, it takes a short distance for singlemode fiber to really be singlemode, since several modes may be supported for a short distance after connectors, splices or sources. Singlemode fibers shorter than 10 m may have several modes. To insure short cables have only one mode of propagation, one can use a simple mode filter made from a 2-6 (50-150mm) inch loop of the cable.
Fiber and cable are subject to additional losses as a result of stress. In fact, fiber makes a very good stress sensor. However, this is an additional source of uncertainty when making attenuation measurements. It is mandatory to minimize stress and/or stress changes on the fiber when making measurements. If the fiber or cable is spooled, it will have higher loss when spooled tightly. It may be advisable to unspool it and respool with less tension. Unspooled fiber should be carefully placed on a bench and taped down to prevent movement. Above all, be careful about how connectorized fiber is placed. Dangling fibers that stress the back of the connector will have significant losses.