The difference between edfa and raman amplifier
The main difference: the amplification mechanism is different.
Edfa uses the principle of stimulated radiation of EDF fiber to amplify the optical signal. Raman amplification uses the Raman effect to achieve energy conversion and amplify the optical signal.
In addition, edfa has a limited amplification bandwidth (near 1550 nm), and Raman amplification theoretically amplifies all bands.
The Raman-amplified medium uses a common transmission fiber and does not require an additional gain medium. It is divided into distributed amplification (the amplification effect occurs in tens of kilometers of fiber) and concentrated amplification according to the different working distance (the amplification effect occurs within several kilometers). Inside the fiber).
Raman amplification can achieve low noise amplification, better than EDFA, but the amplification gain is lower than EDFA (about 3 ~ 15db), and requires higher pump light (watt level).
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Edfa uses the principle of stimulated radiation of EDF fiber to amplify the optical signal. Raman amplification uses the Raman effect to achieve energy conversion and amplify the optical signal.
In addition, edfa has a limited amplification bandwidth (near 1550 nm), and Raman amplification theoretically amplifies all bands.
The Raman-amplified medium uses a common transmission fiber and does not require an additional gain medium. It is divided into distributed amplification (the amplification effect occurs in tens of kilometers of fiber) and concentrated amplification according to the different working distance (the amplification effect occurs within several kilometers). Inside the fiber).
Raman amplification can achieve low noise amplification, better than EDFA, but the amplification gain is lower than EDFA (about 3 ~ 15db), and requires higher pump light (watt level).
www.civillaser.com
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