Causes of Optical Loss
• Natural loss of light
• Insertion loss of optical components inserted in optical transmission lines
• Handset loss when fiber is connected
• Impedance mismatch in the cable causes light to reflect, this is called return loss
• Bending, extrusion, impurities and unevenness of fiber material can cause loss
fiber optic connection
• Fixed splicing, commonly known as dead splicing, generally adopts optical fiber fusion splicer, which is used for the direct head of optical cable.
• Active joints, commonly known as live joints, are connected with detachable connectors and are used for optical fiber jumpers, equipment connections, etc.
Tips for fixing joints
The installation of the fixed joint should use the secondary discharge welding method. First, preheat and discharge the fiber end face, shape the end face, remove dust and sundries, and at the same time make the fiber end face pressure uniform through preheating.
light has noise
In addition to attenuation, noise affects the transmission effect of optical fiber information. Attenuation means less useful signal, and noise means more useless signal.
cause of noise
• Extinction ratio unqualified
• Random variation of light intensity
• Caused by time jitter
• Receiver point noise and thermal noise
• Fiber Mode Noise
• Pulse broadening due to dispersion
• Modulo distribution noise of LD
• Frequency chirp of LD
• Reflection
