In order to improve the coupling tolerance and coupling efficiency of Distributed Feedback（DFB） laser and single mode fiber

the coupling characteristics of DFB laser and single mode fiber are theoretically analyzed. A new dual lens coupling system of DFB laser and passive fiber is proposed. The coupling efficiency and coupling tolerance of the dual lens system are simulated by optical software. The traditional silicon or AlN optical coupling platform also needs to be integrated into the organic substrate with the laser driver circuit

which is not conducive to the integration of the system. This paper directly uses the organic substrate as the optical coupling platform

eliminating the need to re-integrate into the organic substrate

which makes the installation easier and the integration simpler. The stress analysis of the structure was carried out to simulate the warpage of BT organic materials

AlN ceramic materials and FR4 organic materials as substrate materials at the highest working temperature. Based on the simulation results

the dual lens system was fabricated and tested. The test results show that the coupling loss of the system is 4.9 dB

which indicates that this structure can provide reference for the coupling of DFB lasers and single-mode fibers.