EDFA erbium-doped fiber amplifier classification:
1. The booster amplifier is behind the combiner, which is used to enhance the power of multiple wavelength signals after the combiner, and then transmit them,
Therefore, the requirement of noise figure and gain of a power amplifier is not very high, but it requires a relatively large output power after amplification.
2. The line amplifier is behind the power amplifier, which is used to periodically compensate the transmission loss of the line. Generally, it requires low noise figure and high output optical power.
3. The pre amplifier is in front of the divider and behind the line amplifier, which is used for signal amplification to improve the sensitivity of the receiver (under the condition that the optical signal-to-noise ratio (OSNR) meets the requirements, the larger input power can suppress the noise of the receiver itself and improve the sensitivity of the receiver). The noise index is very small, and the output power is not required too much.
EDFA fiber amplifier is also known as erbium-doped fiber amplifier, it is a major breakthrough in optical fiber communication technology, because it can directly amplify the weak optical signal without going through the optical electrical optical conversion process. In addition, what do you know about EDFA fiber amplifier?
Why use EDFA fiber amplifier?
There are many different bands in the transmission process of optical fiber, such as C-band (1530nm-1560nm) and L-band (1560nm-1600nm). Because the wavelength of different bands is different, the communication will be affected, so it is necessary to amplify the cross band channel of optical fiber link to ensure the normal communication effect.
EDFA fiber amplifier just meets this demand, it can use residual fiber as gain medium to amplify optical signal, amplify a wide wavelength range (1500nm-1600nm), enough to amplify the data channel with the highest data rate. This characteristic can play an important role in WDM multi-channel optical transmission system, and therefore becomes an indispensable part of WDM system.
Advantages of EDFA fiber amplifier
In addition to the above mentioned need not go through the optical electrical optical signal conversion process, EDFA fiber amplifier also has the following advantages:
EDFA fiber amplifier has high gain. The gain value of fiber amplifier is one of the important parameters. A better fiber amplifier gain can reach 33dB, while EDFA fiber amplifier gain is about 30 ~ 40dB, which has a higher gain.
The noise figure of EDFA fiber amplifier is small. EDFA fiber amplifier can radiate noise spontaneously, so its noise figure is lower than the general, generally 4 ~ 7dB.
The bandwidth of EDFA fiber amplifier is wide. EDFA fiber amplifier has a bandwidth of 20 ~ 40nm at 1550nm, which can carry out multi-channel transmission and increase the transmission capacity.
EDFA fiber amplifier has low loss. The working wavelength of EDFA fiber amplifier is just the best band (1500 ~ 1600nm) for optical fiber communication, which belongs to the lowest loss region, so the EDFA fiber amplifier has low loss and long transmission distance.
Application of EDFA fiber amplifier
1. Optical fiber wiring system
2．FTTX、FTTH
3. DWDM optical communication network
4. Video optical transmission system and CATV
5. Long distance transmission of Analog & Digital CATV optical signal
Problems of optical amplifier
Although optical amplifier (especially EDFA) has many outstanding advantages, it is not an ideal amplifier. In addition to the additional noise which makes the SNR of the signal decrease, there are some other shortcomings, such as:
The gain spectrum in the bandwidth of the amplifier is not flat, which affects the performance of multi-channel amplifier;
The effects of ASE noise, fiber dispersion and nonlinear effects will accumulate when optical amplifiers are cascaded.
These problems must be considered in application and system design.
Application of optical amplifier in optical fiber communication system
In the optical fiber communication system, the optical amplifier can be used not only as the power amplifier of the transmitter to improve the transmission power, but also as the preamplifier of the receiver to improve the receiving sensitivity. It can also replace the traditional optical electrical optical repeater to extend the transmission distance and realize all-optical communication.
In the optical fiber communication system, the main factors limiting the transmission distance are the loss and dispersion of the optical fiber. Using narrow spectral line light source or working near zero dispersion wavelength, the influence of fiber dispersion is small. This system does not need complete signal timing regeneration (3R relay) at each relay station. It is enough to amplify the optical signal directly with optical amplifier (1R relay). Optical amplifier can be used not only in long distance trunk line system, but also in optical fiber distribution network, especially in WDM system for multi-channel simultaneous amplification.
Equipped with bipolar high-performance 980nm & 1480 pump laser (belonging to the international top brand of low noise pump laser) and high-performance erbium-doped fiber, it has the characteristics of low distortion, low noise, high reliability, good stability, compact and flexible structure. In order to avoid the damage to eyes caused by laser in the process of use, the fiber connector of EDFA fiber amplifier has a tilt angle, and it is equipped with heat dissipation and ventilation devices, which can ensure a longer service life.
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