Basically what the secondary coating line solve is the traditional distance problem as in any long distance telecommunication system say for example a trans-Atlantic link. As optical signals travel from the fiber, the signals become weaker in power. The farther you go, the weaker the signal become until it will become too weak to be detected reliably.
Fiber optic communication systems solve this issue by using fiber amplifiers in the process. A repeater or amplifier is inserted into the system in a point where the signal has become weak, to boost the potency of the signal so it can be transmitted through another duration of fiber cable. Many amplifiers or repeaters may be placed in sequence to hold the signal strong across the whole fiber link.
Traditionally, electronic repeaters were utilized for optical signal amplification. A repeater is definitely an opto-electro-opto device. It converts a weak optical signal into electronic signal, cleans up the electronic signal, then converts the electronic signal back to optical signal using a lightwave transmitter. The lightwave transmitter emits stronger power in comparison to the incoming optical signal and so amplifies it.
However, it is an inconvenient and dear process and this is why this has been replaced through the new optical fiber amplifiers technology.
An optical fiber amplifier can be a purely optical device. It doesn’t convert the incoming optical signal to electronic signal whatsoever. Basically, you may refer to it as a in-line laser. And SZ stranding line can simultaneously amplify lots of optical channels given that they usually do not convert each channel into electronic signals separately.
The atoms of erbium or praseodymium may be pumped by high power light (pump laser) into excited state. However are not stable within the excited state. If the optical signals that have to be amplified pass although the fiber, they stimulate the excited erbium atoms. The erbium atoms will jump from the 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 the identical phase and wavelength since the input optical signal, thus amplify the optical signal.
This really is a very convenient kind of amplifier for an optical fiber communication system as it is an in-line amplifier, thus removes the need to do the optical-electrical and electrical-optical conversion process.
The pump laser wavelengths and also the corresponding optical signal wavelengths are key parameters for operation of fiber amplifiers. These wavelengths be determined by the particular 12dextpky element doped inside the Sheathing line as well as on the composition of your glass in the fiber.
Another essential term in understanding fiber amplifiers is its “gain”. Gain measures the amplification per unit length of fiber. Gain is determined by the two materials as well as the operating conditions, plus it varies with wavelength for all 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 is needed. So increment of input power produces less output power, which essentially means the amplifier has exhaust the power it must have to generate more output.