1. Single wavelength EDFA is divided into preamplifier PA, power amplifier BA, and line amplifier LA. What is the difference between them?
Answer: Erbium doped fiber small signal amplifier (PA) is a specialized amplifier for amplifying weak optical signals in the range of -45dBm to -25 dBm. The typical gain of small signals is as high as 35-45 dB, and it has a low noise figure. It is usually used before photodetectors to pre amplify signals to improve their detection ability for weak optical signals, so it is also called a preamplifier. For example, in the following figure, the input optical power is -35dBm. After being amplified by a PA35 amplifier, it provides an effective gain of over 35dB for the signal in the spectrum, and the amplified signal to background noise ratio is still higher than 30dB. If replaced with a BA amplifier, although the total power can also be amplified to the same level, the signal to background ratio is only about 10dB or lower. The focus of PA type amplifiers is to pursue high gain coefficients.
Erbium doped fiber power amplifier (BA) is a device that further increases the emission power of a light source on the basis of having a certain power. Usually used for power enhancement of optical signals in the range of -6dBm~+3dBm or higher. The maximum output power of ordinary single-mode models can reach 26dBm (400mW), while high-power single-mode models can reach up to 40dBm (10W). Usually used to increase the emission power of laser light sources, with a focus on pursuing high output power.
Erbium doped fiber line amplifier (LA) is an optical power amplifier product specifically designed for line relays in fiber laser or fiber communication systems. It combines the advantages of PA and BA amplifiers, providing high gain amplification for small signals and emitting high laser power. It has the advantages of high gain, high transmission power, and relatively low noise, and is used between fiber segments to increase relay length or compensate for branch losses in the corresponding single to multi-point parts of the optical access network. Simply put, it can be considered as a combination of PA and BA.
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