Optoelectronic transceiver module laser diode stabilizer and bias control method

  • US RE36,491 E
  • Filed: 06/03/1998
  • Issued: 01/11/2000
  • Est. Priority Date: 07/27/1995
  • Status: Expired due to Term
First Claim
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1. A power stabilizing circuit for maintaining a constant level of output power from a laser transmitter, wherein said laser transmitter includes a laser diode configured to emit an optical output signal having an output power level corresponding to a bias current input to said laser diode, and a photodiode for monitoring said optical output signal, providing a voltage feedback signal proportional to said output power level, said power stabilizing circuit comprising:

  • a) a digitally controlled potentiometer, said potentiometer including a wiper contact having a variable output resistance for supplying an adjustable voltage reference signal;

    b) an op-amp having first and second inputs, said adjustable voltage reference signal connected to said first input, and said voltage feedback signal connected to said second input, such that said op-amp compares said voltage reference signal and said voltage feedback signal to generate an output control signal corresponding to the voltage difference between said first and second input; and

    c) a bias current driver driven by said output control signal for supplying said bias current to said laser diode.

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