What are the reasons for optical fiber dispersion? Let’s take a look at it together. Dispersion is also an important factor affecting optical signal transmission. Chromatic Dispersion: Broadening of the bandwidth caused by the propagation of an optical pulse over a distance along an optical fiber. It is the main factor limiting the transfer rate.
Causes of Fiber Dispersion
• Intermodal Dispersion: Occurs only in multimode fibers because light of different modes travels along different paths.
• Material dispersion: Light of different wavelengths travels at different speeds.
• Waveguide Dispersion: Occurs because light energy travels at slightly different speeds as it travels through the core and cladding. In single-mode fiber, it is very important to change the dispersion of the fiber by changing the internal structure of the fiber.
Effect of Fiber Material
• Glass optical fiber: the core and cladding are made of glass, with low loss, long transmission distance and high cost.
• Silicone optical fiber: the core is glass, the cladding is plastic, the characteristics are similar to glass optical fiber, and the cost is lower.
• Plastic optical fiber: The core and cladding are made of plastic, with high loss, short transmission distance and low price. It is mostly used for home appliances, audio, and short-distance image transmission.
optical module
The optical module is a component that realizes the conversion of optical signals and electrical signals. The common ones are GBIC, SFP, SFP+, XFP, SFF, CFP, etc.
GBICs and SFPs
The GBIC optical module is too bulky and takes up too much space in the switch, which makes it impossible to provide more ports on the switch panel. Therefore, GBIC optical modules have been gradually replaced by SFP optical modules in recent years.
