主要光源有：增益开关半导体激光器(GS-DFB),它的动态“单频”特性好,脉冲重复频率0～10GHz可调,简单、紧凑、廉价、稳定性好,但有啁啾;掺杂光纤环形锁模激光器（ML-FRL）,输...
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Nowadays, the optical pulse used in the OTDM system is often generated by the gain-switched distributed-feedback (GS-DFB) semiconductor laser, which has a large pulse width and negative chirp.
目前常采用GS-DFB半导体激光器作为OTDM系统的光脉冲源，这种脉冲源产生的光脉冲一般较宽。
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