Basically precisely what the secondary coating line solve is definitely the traditional distance problem like any long-distance telecommunication system for instance a trans-Atlantic link. As optical signals travel from the fiber, the signals become weaker in power. The farther you decide to go, the weaker the signal become until it becomes too weak being detected reliably.
Fiber optic communication systems solve this concern by utilizing fiber amplifiers as you go along. A repeater or amplifier is inserted in the system at the point where the signal is becoming weak, to improve the effectiveness of the signal so it can be transmitted through another time period of fiber cable. Many amplifiers or repeaters may be put in sequence to hold the signal strong across the whole fiber link.
Traditionally, electronic repeaters were used for optical signal amplification. A repeater is surely an opto-electro-opto device. It converts a weak optical signal into electronic signal, cleans within the electronic signal, and then converts the electronic signal to optical signal by using a lightwave transmitter. The lightwave transmitter emits stronger power in comparison to the incoming optical signal and so amplifies it.
However, it is really an inconvenient and dear process and this is why it has been replaced from the new optical fiber amplifiers technology.
An optical fiber amplifier is really a purely optical device. It doesn’t convert the incoming optical signal to electronic signal whatsoever. Basically, you are able to call it a in-line laser. And FTTH cable production line can simultaneously amplify many optical channels because they do not convert each channel into electronic signals separately.
The atoms of erbium or praseodymium might be pumped by high power light (pump laser) into excited state. However are not stable within the excited state. If the optical signals that are to be amplified pass although the fiber, they stimulate the excited erbium atoms. The erbium atoms will jump from your high power level excited state into low power level stable state, and release their energy in the form of emitted light photons simultaneously. The emitted photons have similar phase and wavelength because the input optical signal, thus amplify the optical signal.
This really is a very convenient kind of amplifier to have an optical fiber communication system because it is an in-line amplifier, thus removes the necessity to perform the optical-electrical and electrical-optical conversion process.
The pump laser wavelengths as well as the corresponding optical signal wavelengths are key parameters for operation of fiber amplifiers. These wavelengths depend on the particular 12dextpky element doped from the optical fiber ribbon machine and on the composition of your glass within the fiber.
Another significant term in understanding fiber amplifiers is its “gain”. Gain measures the amplification per unit duration of fiber. Gain is dependent upon both materials and the operating conditions, and it varies with wavelength for those materials.
For low input powers, the output power is proportional on the gains times the fiber length. Thus, P(output) = P(input) x Gain x Length
For top input powers, the gain saturation effect is important. So increment of input power produces less and less output power, which essentially means the amplifier has exhaust your the ability it must have to generate more output.