Thermal Crosstalk in Integrated DFB Laser-EA Modulators

Abstract

The wavelength red-shifting of integrated DFB (Distributed feedback) laser and EA (Electro-absorption) modulator with applied modulator bias voltage has been investigated and this phenomenon is estimated to be due to non-uniform temperature distribution in the device and caused by thermal crosstalk. From the experimental data and thermal analysis, increased absorbed photocurrents associated with EA modulator bias and dissipated power in the EA modulator lead to the temperature increase in continuously operating DFB laser, resulting wavelength red-shifting.