系统采用单模光纤的尾纤半导体激光器作光源的激光准直系统，并为测量提供稳定的基准线。
A single mode fiber (SMF) pigtailed laser diode alignment system provides a laser reference line with fine stability for measurement.
本文将准导模的概念用于等效电流法来求取单模光纤的模耦合损耗。
The concept of quasi-guided mode is applied in equivalent current method to calculate the loss of a single mode fiber caused by mode conversion.
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