The Application of Erbium Doped Fiber Amplifier (EDFA)

Optical amplifiers are a critical component of optical communication systems. Terabytes of data can be transferred over hundreds to thousands of kilometers by overcoming fiber loss restrictions. The first optical amplifier widely employed in optical communication systems was the EDFA. The transmission capacity has increased dramatically as a result of the introduction of wavelength division multiplexing technology. EDFA has become one of the major components of the current generation of optical communication systems due to its wide bandwidth, polarization independence, high gain, high output power, and low noise figure. So what is EDFA? How many do you know about EDFA and what is its application? We will talk about it in this artical.

32 Port Optical Amplifier High Power WDM EDFA

32 Port Optical Amplifier High Power WDM EDFA

What is EDFA?

EDFA, also known as Optical Amplifier or Erbium Doped Fiber Amplifier or Erbium Amplifier. It’s a type of optical repeater that boosts the power of optical signals sent across fiber optic cables. The glass fiber is doped with erbium, a rare-earth element that allows it to absorb and emit light at different frequencies. They can efficiently amplify light in the 1.5-micron wavelength band, which is where silicon-based telecom fibers have the least amount of loss. Because EDFA can simultaneously amplify numerous optical signals, it can be used in conjunction with WDM technology.



An erbium-doped fiber amplifier

Amplifier Types

There are three three major applications for optical fiber amplifiers: booster amplifier, in-line amplifier, and pre-amplifier. These applications are described in more details below:

Booster Amplifier

Booster amplifiers operate on the transmit side of the link and are designed to amplify the signal path leaving the transmitter to the level required to launch into the fiber optic link. It is not always needed in single-lane links, but it is an important component in DWDM links where the multiplexer attenuates the signal path. It has high input power, high output power and moderate optical gain. The booster amplifier is placed directly after the light transmitter. In this application, a boost amplifier is used to compensate for losses in the optics between the laser and the fiber, allowing the increased transmit power to go further in the link.

Booster Amplifier

In-line Amplifier

In-line amplifiers are typically placed at the halfway of a transmission link to overcome fiber transmission and other distribution losses when utilized as line amplifiers. EDFA can directly amplify the optical signal delivered by the line as an alternative to OEO repeaters. Tandem EDFAs are used for optical amplification on the main optical link between two network nodes. Low to medium input power, high output power, good optical gain, and low noise figure are all features of this device.

In-line Amplifier


The EDFA preamplifier is located at the DWDM link’s receiving end. To compensate for losses in the demultiplexer near the optical receiver, a preamp is used. The EDFA preamplifier is installed before the DWDM link’s receiving end, and it’s used to boost the signal level before optical detection in ultra-long-distance systems, boosting receiving sensitivity. It features a low input power, a medium output power, and a medium gain.


Application Fields

EDFA can be used in large-capacity, high-speed optical communication systems; EDFA can be used in long-distance optical communication systems. By using EDFA, we can reduce the number of regenerative repeaters by increasing the repeater spacing, thereby significantly reducing construction costs; EDFA can be used in fiber-optic subscriber access network systems. If the transmission distance is too long, EDFA will play the role of line amplifier; EDFA can be used in wavelength division multiplexing (WDM) systems, especially dense wavelength division multiplexing (DWDM) systems. The use of EDFA in wavelength division multiplexing systems can solve the problem of insertion loss and reduce the impact of dispersion; EDFA can be used in community antenna television (CATV) systems, which play the role of boosting amplifiers and greatly improve the input power of optical transmitters.


Because EDFA is the most frequently applied optical amplifier, EDFA technology proves to be the most advanced and holds the market’s leading position. WDM systems combined with EDFA will gain greater benefits when WDM systems are deployed and the collective bandwidth of optical fibers increases.

Baudcom offers all kinds of Erbium Doped Fiber Amplifier (EDFA). For more information, please feel free to contact us.

Post time: 2021-05-12


Lomoveishiy – Finland

I needed those to connect my PC on the third floor to have internet access in that room, and ISP installed their modem on the first floor only. After dropping fiber patch cables, plugged in all cables into these media converters at both sides, and link came up instantly. Was much easier than I thought!

Raymond – USA

Great experience – units worked straight out of the box – just needed plug in cables and we were done. I also like the possibility to enable jumbo frames, while we do not have a need for this feature at the current moment it’s great to have this option.

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