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In the present paper, the performance characteristics of high speed laser diodes based on vertical cavity surface emitting laser (VCSEL) are deeply and parametrically investigated under thermal-irradiated operating conditions. The processed characteristics are: the harmonic response transfer function, the resonance frequency, 3-dB bandwidth, and the rise time. These diodes affect the transmitted bit-rate in high-speed advanced optical communication systems. The effects of both ambient temperature (and consequently the inner temperature), the injected current (power), and the dose of irradiation are deeply investigated. The pulse rise time and the resonance frequency as well as the 3-dB bandwidth are the major criterions of the device speed. Nonlinear relations are correlated to investigate the power-current and the voltage-current dependences of the devices.