人们早已在实验中观察到条伏结构的GaAs结型LD的输出是椭圆高斯光束.对于圆高斯光束在似透镜介质中的传输规律及实现模式匹配已得到较好的分析结果.用ABCD定律追迹通过复杂的似透镜元件序列的高斯光束参量q(z),从理论上较好解决了基模圆高斯光束在传输中的模式匹配问题.实际的DH激光束不是理想的圆高斯光束,而近似为椭圆高斯光束,那么,它与光纤耦合时如何实现模式匹配,对其进行理论分析是有意义的.即使DH是单模输出、且与单模光纤耦合也存在模式匹配问题,而且更要很好地解决.在实践中,人们已充分注意LD与光纤的耦合,最大限度地提高耦合效率,增加入纤光功率.目前在实用上达到满意的程度,至少对采用IM2调制的LD与多模光纤耦合系统是如此.对LD(在单模输出也如此)与单模光纤耦合,即在单模传输系统中,就应考虑模式匹配,对于调频、调相系统就更如此.单模光纤本身的活接也要保证模式匹配.然而,由事实上的输出的LD空间不对称性,使得对LD与光纤耦合模式匹配的分析与实现变得复杂和困难.本文试用高斯光束的传递矩阵即ABCD定律分析DH激光束与光纤耦合,认为实现椭圆高斯模式匹配是可能的实际作法将椭圆高斯光束分离成两个独立的圆高斯光束,它们各在水平极化面和垂直极化面内的行为,可完全按圆高斯光束的传输规律来描 It has long been observed experimentally that the output of a GaAs junction LD of a stripe structure is an elliptical Gaussian beam, and a good analytical result has been obtained for the transmission law and pattern matching of a circular Gaussian beam in a lens-like medium. The problem of pattern matching in the transmission of fundamental-mode circular Gaussian beams is theoretically solved theoretically by the Gaussian beam parameters q (z) of a complex lens-like element sequence. The actual DH laser beam is not an ideal circular Gaussian beam, Approximates an elliptical Gaussian beam, then it is significant to theoretically analyze the mode matching when it is coupled with a fiber.However, even though DH is a single-mode output and there is a pattern matching problem with single-mode fiber coupling, In practice, people have paid sufficient attention to the coupling of LD and optical fiber, to maximize the coupling efficiency, increase the fiber power into the present degree of practical satisfaction, at least for IM2 modulation and LD This is true of mode-fiber coupling systems, where mode matching is considered for LD (single-mode output as well) coupled with single mode fiber, ie in single-mode transmission systems, and for phase modulation Therefore, the single-mode optical fiber itself must ensure the mode matching.However, due to the fact that the output of the LD space asymmetry, making the LD and optical fiber coupling mode matching analysis and implementation becomes complicated and difficult.This article try Gaussian The ABCD law of the transfer matrix of the beam is that the DH laser beam is coupled with the optical fiber. It is considered that it is possible to realize elliptic Gaussian pattern matching. The actual practice separates the elliptical Gaussian beam into two independent circular Gaussian beams, each of which is horizontally and vertically polarized The behavior in the plane can be described exactly by the transmission law of the circular Gaussian beam