Power Modulated Laser Module: adjust the
power ranges according customer required.
  Frequency Modulated Laser
Module: Frequency modulated laser module is pulsed laser module. Pulsed laser
module can be classified into two categories: external modulated laser module
and internal modulated laser module. The first has an especial signal junction,
the user accesses pulse signal, and signal can be sinusoidal wave or square
wave, the frequency can up to 10MHz. The second does not need external signal
it works in the form of pulses with operating voltage. Pulsed laser module
generally require customized.