Dual loop automatic power control for laser driver

Day-Uei Li (Inventor), Li-Ren Huang (Inventor), Wei-Zen Chen (Inventor)

Research output: Patent


A laser driver. The laser driver comprises a diode driver, a power detector, a first extreme detector, a second extreme detector and a current controller. The diode driver receives bias and modulation currents to control a laser diode for generating light signals. The power detector detects optical power of the light signals. The first and second extreme detectors, both coupled to the power detector, detect the first and second extreme values among detected optical power. The first extreme value is either the maximum or the minimum optical power of the light signals, while the second extreme value is the other.
Original languageEnglish
Patent numberUS 7248610
Priority date7/12/04
Publication statusPublished - 24 Jul 2007


  • laser driver
  • diode driver
  • power detector
  • extreme detector
  • current controller
  • optical power


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