At the input, any periodic square pulse signal can be expressed as the weighted sum of an infinite number of sine and cosine functions. The following chart shows the main characteristics of these light sources. The dispersion in the cable can be modeled by students using a Fourier Series.

The most commonly used laser sources in transceivers are Fabry Perot (FP) laser, Distributed Feedback (DFB) laser and Vertical-Cavity Surface-Emitting (VCSEL) laser. For longer and higher transmission data rate, laser diode are used in most of the modern transceivers. Thus they cannot satisfy the increasing demand for higher data rate and longer transmission distance.

LED diode based transceivers can only support short distances and low data rate transmission. The light source can also affect the transmission distance of a fiber optic link. The conversion of signals is largely depend on a LED (light emitting diode) or a laser diode inside the transceiver, which is the light source of fiber optic transceiver. This process is largely depending on fiber optic transceivers which are used in most of today’s fiber optic network. The conversions between electrical signals and optical signals are necessary. However, most of the terminals are electronic based. That’s the main reason why single-mode can transmit signals over longer distance than multimode fiber.įiber optic cable is the path sending the optical signals. This is because, the core of the single-mode fiber optic is much smaller than that of multimode fiber. (shown in the following picture) For single-mode fiber, it is not model dispersion but chromatic dispersion that affects the transmission distance. Multimode transmission is largely affected by the modal dispersion, because of the fiber imperfections, these optical signals cannot arrive simultaneously and there is a delay between the fastest and the slowest modes, which causes the dispersion and limits the performance of multimode fiber. The other is modal dispersion representing the spreading of the signal over time resulting from the different propagation mode. One is chromatic dispersion, which is the spreading of the signal over time resulting from the different speeds of light rays. There are two types of dispersion that can affect the optical transmission distance. Generally, the maximum transmission distance is limited by dispersion in fiber optic cable.

Dispersio. in cabling