Laser and photodiode design parameters

Discussion in 'Homework Help' started by angeline_happyoo, Jan 10, 2008.

  1. angeline_happyoo

    Thread Starter Member

    Sep 2, 2007
    28
    0
    Hello..

    What must i consider when using laser and photodiode? What is the parameter that should i care for?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    For an ordinary LED as well as a laser diode, current is the critical parameter.

    For photodiodes, it is best to get the spec sheet on each device and use that as a guide to critical parameters.
     
  3. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    Are you referring to matching them for operation? ie. The laser will trigger the photodiode?

    If so, then you need to ensure that the wavelength of the laser matches with the peak sensitivity of the photodiode. This is called the diode's spectral response characteristic. Other considerations, especially for high speed communications, is photodiode terminal capacitance. This is a function of its construction and area of photodiode.

    Steve
     
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