Experimental investigation of thermal crosstalk in a distributed feedback laser array

Thermal crosstalk between lasers in a distributed feedback laser array has been investigated by measuring the oscillating-wavelength shift. Between closely situated lasers, thermal crosstalk due to lateral heat spreading decreases proportionally to the inverse of the laser distance. Thermal crosstalk due to heating in the heat sink and stem becomes dominant between relatively distant ( approximately 300 mu m) lasers. A diamond heat sink reduces thermal crosstalk to about 1/3 compared to a silicon heat sink.<
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