Basically precisely what the SZ stranding line solve is definitely the traditional distance problem like in any great distance telecommunication system such as a trans-Atlantic link. As optical signals travel throughout the fiber, the signals become weaker in power. The farther you are going, the weaker the signal become until it becomes too weak to become detected reliably.
Fiber optic communication systems solve this concern by making use of fiber amplifiers on the way. A repeater or amplifier is inserted to the system at the point the location where the signal has grown to be weak, to improve the strength of the signal so it may be transmitted through another period of fiber cable. Many amplifiers or repeaters may be placed in sequence to hold the signal strong down the whole fiber link.
Traditionally, electronic repeaters were utilized for optical signal amplification. A repeater is surely an opto-electro-opto device. It converts a weak optical signal into electronic signal, cleans in the electronic signal, and then converts the electronic signal straight back to optical signal by using a lightwave transmitter. The lightwave transmitter emits much stronger power compared to incoming optical signal and so amplifies it.
However, it becomes an inconvenient and dear process and which explains why this has been replaced from the new optical fiber amplifiers technology.
An optical fiber amplifier is a purely optical device. It doesn’t convert the incoming optical signal to electronic signal by any means. Basically, it is possible to call it a in-line laser. And Secondary coating line can simultaneously amplify lots of optical channels because they tend not to convert each channel into electronic signals separately.
The atoms of erbium or praseodymium could be pumped by high power light (pump laser) into excited state. However they are not stable within the excited state. When the optical signals that should be amplified pass even though fiber, they stimulate the excited erbium atoms. The erbium atoms will jump in the high power level excited state into low power level stable state, and release their energy in the form of emitted light photons as well. The emitted photons have the identical phase and wavelength since the input optical signal, thus amplify the optical signal.
This can be a very convenient method of amplifier on an optical fiber communication system because it is an in-line amplifier, thus removes the requirement to perform the optical-electrical and electrical-optical conversion process.
The pump laser wavelengths along with the corresponding optical signal wavelengths are key parameters for operation of fiber amplifiers. These wavelengths depend on the particular 12dextpky element doped within the Secondary coating line as well as on the composition of your glass from the fiber.
Another necessary term in understanding fiber amplifiers is its “gain”. Gain measures the amplification per unit time period of fiber. Gain depends upon the two materials as well as 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 high input powers, the gain saturation effect comes into play. So increment of input power produces less output power, which essentially means the amplifier has exhaust your the strength it must have to generate more output.