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中文摘要：
分布反馈半导体激光器的线宽一般较大，难以满足光纤传感等领域的要求。根据C．H．Henry于1982年提出的半导体激光器的线宽理论，通过适当设计DFB半导体激光器的腔长、耦合系数、微分增益、光限制因子，能有效地减小激光器的线宽。同时，空间烧孔现象也可限制DFB半导体激光器的线宽，为此需要合理设计光栅结构。在此基础上，DFB激光器的线宽能达到几十千赫兹的量级。此外，采用DBR结构或者外腔结构，也可以获得相当窄的线宽。
英文摘要：
The linewidth of distributed feedback （DFB） semiconductor lasers is usually too wide to meet the requirement of fiber-optic sensing. According to the linewidth theory of semiconductor lasers proposed by C. H. Henry in 1982, reduced linewidth can be obtained with proper design of key parameters of a DFB laser, such as cavity length, coupling coefficient, differential gain and optical confinement factor. Meanwhile, spatial-hole-burning is also detrimental to linewidth-narrowing, and special care must be paid to grating structure design to achieve narrow linewidth. By taking the above issues into consideration, DFB semiconductor lasers with a linewidth of 10-kHz have been demonstrated. In addition, ultra-narrow linewidth can be also realized by adopting DBR structure or external cavity structure.
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