Why the erbium-doped fiber amplifier has the largest gain at 1531nm
Why the erbium-doped fiber amplifier has the largest gain at 1531nm？
The energy difference between the metastable state and the ground state of the rare earth element Er(3+) doped in the fiber is equivalent to the energy of the photon of 1550 nm. When the pump light energy (980 nm or 1480 nm) of the appropriate wavelength is absorbed, the electrons will transition from the ground state. To the higher energy level of the excited state.
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Then, a small amount of energy is released and transferred to a more stable metastable state. When the pumping source is sufficient, the electrons of the erbium ion are reversed, that is, the metastable state of the high energy level is larger than the number of ground state electrons having a lower energy level.
When the appropriate light signal passes, the metastable electrons will have a stimulated radiation effect, emitting a large number of photons of the same wavelength, but because of the vibrational energy level, the wavelength is not a single but a range, typically 1530 nm to 1570 nm. （www.civillaser.com）
The energy difference between the metastable state and the ground state of the rare earth element Er(3+) doped in the fiber is equivalent to the energy of the photon of 1550 nm. When the pump light energy (980 nm or 1480 nm) of the appropriate wavelength is absorbed, the electrons will transition from the ground state. To the higher energy level of the excited state.
Then, a small amount of energy is released and transferred to a more stable metastable state. When the pumping source is sufficient, the electrons of the erbium ion are reversed, that is, the metastable state of the high energy level is larger than the number of ground state electrons having a lower energy level.
When the appropriate light signal passes, the metastable electrons will have a stimulated radiation effect, emitting a large number of photons of the same wavelength, but because of the vibrational energy level, the wavelength is not a single but a range, typically 1530 nm to 1570 nm. （www.civillaser.com）
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