Need for optical fiber amplifiers Optical amplifier EDFA solves the traditional distance problem as in any long-distance telecommunication system such as a trans-Atlantic link. The signals become weaker in power because optical signals travel through the fiber. The signal become weaker if you go far until it becomes too weak to be detected reliably. Optical fiber amplifiers and their working An optical fiber amplifier is a part of optical fiber that is doped with a rare-earth element such as erbium or praseodymium. By high power light (pump laser) the atoms of erbium or praseodymium can be pumped into an excited state. But in the excited state, they are not at all stable. When there is a need for optical signals to be amplified then it is required that they should pass through the fiber as they stimulate the excited erbium atoms. The erbium atoms will then jump from the high-power level excited state into a low power level stable state, and at the same time, it releases their energy in the form of emitted light photons. Like the input optical signal, the emitted photons have the same phase and wavelength thus amplifying the optical signal. This is a very convenient form of the amplifier, especially for an optical fiber communication system as it is an in-line amplifier. It then removes the need to do the optical-electrical and electrical-optical conversion process. Cooperation of fiber optical attenuator pumps the laser wavelengths and the corresponding optical signal wavelengths are key parameters. These wavelengths rely on the type of rare-earth element doped in the fiber and also on the composition of the glass in the fiber. Gain is another important term in understanding fiber amplifiers. The amplification per unit length of fiber is measured in gain. The gain depends on both the materials and the operating conditions, and it differs with wavelength for all materials. In the case of low input powers, the output power is proportional to the gains times the fiber length. The gain saturation effect comes into play for high input powers. So, an increment of input power produces less and less output power, which means that the optical switch has run out of the power it needs to generate more output. Follow our Facebook and Twitter for more information about our product.
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The strength of an optical signal that passes through it to a fiber optic cable or open-air is decreased by an optical attenuator. In decibels over a specific distance the signal travels, the intensity of the signal is described. The change that is observed is the strength or amplitude of the signal and not the overall waveform or frequency, so for use in the desired application, the optical signal remains undistorted. Optical attenuators in optical communication systems are often used, in which the transmission loss or attenuation helps with the digital signals long-distant transmission. By an optical attenuator, the principle of gap loss can be applied it is installed where signals are transmitted so to the optimal level over a given distance, the signal intensity is lowered. The signal strength is not lowered enough by the attenuators installed elsewhere along with the optical fiber, but to compensate for some devices you need to utilize signal absorbing or reflecting components. Telling about the type of equipment in which it can be installed, the attenuator consists of a box-like structural or cylindrical shape. Sometimes found in an electronic circuit, the fixed variety of optical attenuators does not reflect light signals to decrease their intensity. It is used where high accurate data transmission is needed. By the amount of power, the optical isolator function is determined and can be handled in addition to important variables such as performance versus frequency range and temperature. Resistors are used by many optical attenuators, but a variable optical attenuator utilizes metal-semiconductor field-effect transistors or other solid-state components. On a printed circuit board a variable optical attenuator can be mounted, or in test devices such as an optical power meter, it can be used. With an optical fiber cable, many attenuators are installed in-line just to adjust the transmitted signal accordingly. Online fiber splitter is sold by many retailers and manufacturers so just by reading the product specifications one can assess their characteristics. Things that need to be considered include its overall dimensions and the type of environment it can operate, how much attenuation it provides, as well as average and peak power the device can tolerate. For more information, please visit: www.fiber-mart.com/ |
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