Spot coupling and conversion device

Abstract

The invention discloses a spot coupling and conversion device. The spot coupling and conversion device comprises a semiconductor laser, a lens, a fiber core insert, and a single-mode fiber, which are sequentially connected and coupled in series, wherein the fiber core insert is a multi-mode fiber core insert. The multi-mode fiber core insert used as the substitute of the existing single-mode fiber core insert has a larger optical aperture, which can improve the tolerance degree when the beam and the optical fiber are mismatched so as to ensure constant output power when the coupling of the beam and the fiber core insert has little mismatch. Meanwhile, the length of the multi-mode fiber core insert is limited to ensure the minimum coupling loss between the multi-mode fiber core insert and the single-mode fiber. The spot coupling and conversion device can improve the yield, save the energy and lower the cost.

Description

technical field [0001] The invention relates to a device for realizing light spot coupling conversion. Background technique [0002] At present, the coupling method adopted by the optical transmitting sub-module and the optical bi-directional sub-module is in series, such as figure 1 As shown, the spot replacement device 10 includes a semiconductor laser 1, a lens 2, a single-mode fiber ferrule 3 and a single-mode fiber 4 coupled in series, the disadvantage of this structure is that the light-through hole 31 of the single-mode fiber ferrule 3 The diameter is very small, resulting in a very low tolerance between the beam and the single-mode fiber ferrule 3. When there is a slight mismatch between the high-low temperature beam and the single-mode fiber ferrule, the optical power of the fiber will drop significantly, which is reflected in the industrial The tracking error metric works poorly at temperature. Contents of the invention [0003] In view of this, the technical p...

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Problems solved by technology

[0002] At present, the coupling method adopted by the optical transmitting sub-module and the optical bi-directional sub-module is in series, such as figure 1 As shown, the spot replacement device 10 includes a semiconductor laser 1, a lens 2, a single-mode fiber ferrule 3 and a single-mode fiber 4 coupled in series, the disadvantage of this structure is that the light-through hole 31 of the single-mode fiber ferrule 3 The diameter is very small, resulting in a very low tolerance between the beam and the single-mode fiber ferrule 3. When there is a slight mismatch between the high-low temperature beam and the single-mode fiber ferrule, the optical power of the fiber will drop significantly, which is reflected in the industrial Tracking error metrics work poorly at temperature

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