Optical amplifiers are used extensively in fiber optic data links. Note that now the group velocity of the optical mode appears in the last term on the right hand. In a distributed raman amplifier, the optical fiber link itself is used as the amplification medium. The raman optical amplifiers have a wide gain bandwidth up to. The above figure shows three ways in which optical amplifiers can be used to enhance the performance of optical data links. Optical amplifiers use stimulated emission to amplify a optical signal, just as lasers. In this video, i have covered optical amplifier with following outlines. Chapter 9 semiconductor optical amplifiers cornell university. Typically, the optical pump is introduced at the end of a length of fiber in order to provide optical gain that increases towards the end of the fiber. A high power pump laser is injected at the far end and travels backward in the fiber to amplify. To transmit a signals over long distances 100km, to compensate attenuation losses. It is an analog device, so what you put is what you get. Raman amplifiers used in conjunction with edfas semiconductor optical amplifiers small package potential use for lowcost applications potential use for optical switching opti 500 c, spring 2011, lecture 23, introduction to optical amplifiers 1 types of optical amplifiers.
Optical signals are amplified up to 10 db in the network optical fiber. Ec conduction band ev valence band schematic illustration of the the structure of a double heterojunction stripe contact edge emitting led. A typical structure of a ingaaspinp soa is shown in the figure below. Note that noise exists because of spontaneous emission without any input. Here you can download the optical fiber communication vtu notes pdf ofc pdf vtu of as per vtu syllabus. The shape of tbe gain curve is similar for arbitrary fiber designs note tbat tbe numerical values. Op amp golden rules memorize these rules 1 the op amp has infinite openloop gain. A booster amplifier or post amplifier is used to increase the optical output of an optical transmitter just before the signal enters an optical fiber. Eindhoven university of technology master an optical amplifier. A raman optical amplifier is little more that a highpower pump laser, and a wdm or directional coupler.
However soa is not popular as much as edfa for optical fiber communication. For example, a slide projector shows an image of a slide on a screen. Optical fiber communication vtu notes pdf ofc pdf vtu. Semiconductor optical amplifiers soas, as the name suggests, are used to amplify optical signals. In this way, a raman amplifier can be combinedfa booster or inlineed with a n.
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