Abstract
Spectral characteristics of 1.3 micrometers DFB lasers with different wavelength detunings are investigated at various temperatures ranging from 20 to 80 degree(s)C. DFB lasers have different amounts of detuning at RT: almost no detuning, a positive detuning of 5 nm and a negative detuning of 25 nm. AR-HR coated 300 micrometers long DFB lasers have typical CW threshold currents of 9 mA, slope efficiencies of 0.27 mW/mA, and coupling coefficients (K) of 60 cm-1. For the DFB LD with a positive detuning, the detuning of +5 nm at 20 degree(s)C is changed to -15 nm at 80 degree(s)C with the SMSR of 38 dB maintained. Whereas, at 80 degree(s)C Fabry-Perot modes appear from the DFB LD with a negative detuning and a smaller SMSR of 35 dB is obtained from the DFB LD with almost no detuning. These results indicate that a DFB LD with a positive detuning shows better spectral characteristics than others.
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