Drive circuit for coaxial tail fiber type laser

The utility model discloses a drive circuit for a coaxial tail fiber type laser, comprising a photoelectric detector, a pre-positioned amplification circuit, a secondary amplification circuit, a reference voltage adjusting circuit, a current driving circuit, etc. The photoelectric detector packaged together with the laser is used for detecting the optical power change of the detection laser, a photoelectric current is generated on the photoelectric detector, the amplified photoelectric current has a negative feedback effect on the positive current of the LD, and the light output of the laser is stable. The drive circuit for a coaxial tail fiber type laser is advantageous in that the circuit is simple, the volume is small, cost is low, the reliability is high, the power is adjustable, etc.