Introduction
Multimode fiber is a type of optical fiber used to transmit data signals over short distances. Multimode fiber comes in different sizes and types, but the most commonly used are 50nm and 62.5nm. In this blog post, we will discuss the differences between these two types of multimode fiber.
Core Diameter
The core diameter of multimode fiber 50nm is smaller than that of 62.5nm, which means that it has a smaller area for light to travel through. As a result, 50nm fiber has a higher bandwidth than 62.5nm fiber, making it suitable for high-speed data transmission.
Modal Dispersion
Modal dispersion is a phenomenon that occurs when light travels through a fiber and the different modes of light travel at different speeds. In multimode fiber, modal dispersion can be a limiting factor for data transmission. 50nm fiber has lower modal dispersion than 62.5nm fiber, which means that it can transmit data over longer distances without signal degradation.
Light Source
The light source used with multimode fiber can affect the performance of the fiber. 50nm fiber is optimized for use with vertical-cavity surface-emitting lasers (VCSELs), which have a narrower spectral width than the light sources used with 62.5nm fiber. This narrow spectral width allows for higher bandwidth and lower modal dispersion.
Cost
62.5nm fiber is an older technology and is less expensive than 50nm fiber. However, 50nm fiber is becoming more widely used and the cost is decreasing. As a result, the cost difference between the two types of fiber is becoming smaller.
Conclusion
In summary, the core diameter, modal dispersion, light source, and cost are the main differences between multimode fiber 50nm and 62.5nm. 50nm fiber has a smaller core diameter, lower modal dispersion, and is optimized for use with VCSELs, making it suitable for high-speed data transmission over longer distances. However, it is also more expensive than 62.5nm fiber, which may be a consideration for some applications.
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