Continuous-wave operation of a 1.3 μm wavelength npn AlGaInAs/InP transistor laser up to 90 °C

A transistor laser (TL) is a device that operates at a high-speed with multiple functions such as output control with low wavelength shift and signal mixing. By adopting a high heat dissipation structure with a high-speed compatible wide electrode pad and thick Au plating in TLs, improvement of temperature performance in 1.3 μ m wavelength npn AlGaInAs/InP TL was demonstrated. As a result, continuous-wave operation of a 1.3 μ m TL up to 90 °C was achieved. The thermal resistance was estimated to be 25 K W −1 , based on the spectrum behavior, which is at least four times lower than the previously observed value.