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叙述了1.3μm波段的半导体激光器进入带锥体半球面端(TH纤维)单模纤维的有效耦合。用锥体半球面端纤维耦合可得到35％以上的耦合效率。端面半球的最佳半径是～20μm,并且,用电弧拉制这一半球透镜具有较好的重复性。已经发现,由于反射光引起激光器特性的变化在用TH纤维耦合时比用平面端耦合小得多。使用TH纤维耦合已经为系统制作了稳定的耦合器件。 1、引言用单模光纤作传输,尤其是对长距离和海底传输正在成为可能。单模纤维传输移向1μm波长区域的原因是减少光纤的损耗,并且,最近的光源和探测器也向这个区域发展。在单模纤维中,传输线的带宽是足够宽的,传输的距离主要受损耗限制。所以,发射机的功
The effective coupling of a 1.3 μm-band semiconductor laser into a single-mode fiber with a pyramidal hemispherical end (TH fiber) is described. The hemispherical end of the cone fiber coupling can be obtained more than 35% coupling efficiency. The best hemispherical radius is ~ 20μm and the arc-drawn hemispherical lens has better repeatability. It has been found that variations in laser characteristics due to reflected light are much less than with planar end coupling when coupled with TH fibers. The use of TH fiber coupling has made the system a stable coupling device. 1 Introduction Single-mode fiber for transmission, especially for long-distance and undersea transmission is becoming possible. The reason that the single-mode fiber transmission is shifted to the 1 μm wavelength region is to reduce the loss of the optical fiber, and the nearest light source and detector are also developed to this region. In single-mode fibers, the bandwidth of the transmission line is sufficiently wide that the transmission distance is largely limited by the loss. So, the transmitter's work