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Abstract
A unified approach to study the effects of temperature on the static and dynamic characteristics of multilongitudinal mode laser diode has been attempted by incorporating an analogous heat flow circuit in the electrical equivalent circuit model of the laser diode. The effect of temperature on the threshold current, longitudinal mode behavior,and the thermal fluctuations are analyzed by simulating the circuit for dc sweep and transient conditions using the circuit analysis program PSPICE. The analysis shows that the side modes dominate at higher temperatures resulting in a shift in output optical wavelength. The optical output of each mode varies with temperature in a parabolic fashion. In transient simulations, thermal fluctuations are found to increase with temperature and decrease with operating frequency. The small signal ac simulation predicts a sharp decrease in the 3dB bandwidth of the device with temperature. Furthermore, the presence of package parasitics also decreases the bandwidth.
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