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The paper presents an experimental investigation and develop a strategy to control mode-locking instabilities of an edge emitting two-section monolithic tapered quantum dot laser. The laser is gain guided, has a total length of 2780 micrometer and an absorber length of 400 micrometer. The experimental setup consists of the quantum dot laser driven by a current source for the gain section and a voltage source for the absorber section. Electrical stabilization is performed by grounding the absorber by a 50 ohm resistor and a high pass filter in series. The voltage source is connected by a low pass filter. Optical feedback is implemented by means of a partially reflecting mirror which was shown to reduce timing fluctuations of the mode-locked pulse train in. Detection and evaluation is carried out in the radio frequency (RF) domain by means of a fast photodiode and an electrical spectrum analyzer.