The Difference Between Fiber Laser and Fiber Amplifier

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Structurally, the laser requires a resonant cavity, a pump source, and the amplifier only needs to be pumped without the need for oscillation.
The laser is converted into laser light by the pump light, and then the laser is continuously oscillated and amplified, and the amplifier needs to inject the signal laser in the early stage, and its function is to amplify the signal laser.

The laser is a light source that can directly emit light and output an optical signal. The laser switch is controlled by the input electrical signal, and the input electrical signal is modulated into an optical signal, and then the optical signal is output.
Fiber amplifier, not a light source. It converts the externally input electrical energy into pump light. When the signal light is incident, under the stimulation of the incident light, the energy level of the pump light transitions, and the energy of the pump light is transferred to the signal light, and the signal light is transmitted. The power is boosted to amplify the signal light.


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