脉冲频率调制又包括了两种方式，即等宽pfm和SWFM。
The PFM technology includes two kinds modes: constant width PFM and SWFM.
内调制式激光器不需要外接信号，加上工作电压后，激光器即以脉冲方式工作，其工作频率根据用户设计、定做。
The second does not need external signal; it works in the form of pulses with operating voltage. Pulsed laser module generally require customized.
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