What are the types of optical amplifiers-fiberwdm.com

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What are the types of optical amplifiers

November 18 , 2021

Optical amplifiers can be divided into two categories:

One type is that semiconductor optical amplifiers are made of semiconductor materials and can be regarded as semiconductor traveling wave optical amplifiers without feedback.

The other is a fiber amplifier, which includes two types, one is a nonlinear fiber amplifier, which uses a strong light source to excite the fiber, so that the fiber produces a nonlinear effect and Raman scattering occurs. In this excited section of the fiber It is amplified during the transmission process. Its main disadvantage is that it requires a high-power semiconductor laser as the pump source (about 0.5~1W), so it is currently difficult to achieve practicality; the other type of fiber amplifier is erbium-doped fiber amplifier (EDFA), Erbium (Er) is a kind of rare earth element. It is injected into the core to form a special optical fiber, which can directly amplify the optical signal of a certain wavelength under the action of the pump light, so it is called doping. Erbium fiber amplifier. Because erbium-doped fiber amplifier has a series of advantages, it has been developed rapidly in recent years and has been widely adopted.

The main advantages of erbium-doped fiber amplifiers are as follows.

(1) The working wavelength is in the range of 1.53～1.56μm, which is consistent with the minimum loss window of the optical fiber.

(2) The pump power for exciting the erbium-doped fiber is low, only tens of milliwatts; while the Raman amplifier needs a pump source of 0.5 to 1W for excitation.

(3) The gain is high, the noise is low, and the output power is large. Its gain can reach 40dB, the noise figure can be as low as 3~4dB, and the output power can reach 14~20dBm.

(4) The connection loss is low. Because it is an optical fiber amplifier, it is easier to connect with the optical fiber, and the connection loss can be as low as 0.1dB.

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