TY - JOUR ID - TI - Controlling the Q-Point in Distributed Feedback Lasers Using a Numerical Optimization Methodology AU - Hisham K. Hisham PY - 2019 VL - 37 IS - 5part (A) Engineering SP - 148 EP - 156 JO - Engineering and Technology Journal مجلة الهندسة والتكنولوجيا SN - 16816900 24120758 AB - In this paper, a new methodology for controlling the Q-point in thedistributed feedback (DFB) lasers is proposed. The method based on reducingthe DFB transient period (TP) by optimizing laser’s model parametersnumerically. The analysis has taken into account investigated the effects of thelaser injection current (Iinj), the dc-bias level (Ibias), the temperature (T)variation, and the gain compression factor (ε). Results showed that byoptimizing the value of Iinj, Ibias, T and ε; the Q-point could be controlledeffectively. Where increasing the current ratio (i.e., Iinj/Ith) leads to reduce theTP value. In addition, by increasing Iinj and/or Ibias, the relaxation oscillationperiod (TRO) and the laser delay time (TDelay) are reduced significantly. Fromthe other hand, the temperature varying may push the DFB laser to operate inan improper region through increasing the TP value; which may lead it tooperate in the off-mode. Moreover, as ε is increased, the sinusoidal oscillationsare dramatically damped results in a reduction in the TRO value and largerperiod of stabilized.

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