Characterization of DFB Laser and its high-speed optical interconnection at 4 K and room temperature

In this article, an optical interconnection system from low temperature (4 K) to room temperature was built based on a conventional Distributed Feedback Laser. The curves of P–I–V and the spectra of Distributed Feedback Laser were characterized from 296K to 4K. The laser spectrum had a significant blue shift from 296 K to 4 K, the bandwidth of 16.18 GHz and 12 Gbps eye diagram was achieved. •The study of laser characteristics extends to 4 K instead of the common 77 K.•It has been proved that the conventional directly modulated laser can normally work in a low-temperature environment.•Commercial DFB has the potential to be used in the technology of optical interconnection between low and room temperatures.