Title :
Relative intensity noise measurements of 5 μm quantum cascade laser and 1.55 μm semiconductor laser
Author :
Takagi, Y. ; Kumazaki, N. ; Ishihara, M. ; Kasahara, K. ; Sugiyama, A. ; Akikusa, N. ; Edamura, T.
Abstract :
The magnitude of the relative intensity noise (RIN) of a 5 mum distributed-feedback quantum cascade laser (DFB-QCL) was compared with a conventional 1.55 mum DFB laser diode (LD). The RIN for the DFB-QCL at a frequency of 1 MHz was 157 dBm at 10 mW light output, about 5 dB higher than that of the DFB-LD, which could almost be fully explained by the semi-classical noise model. The resonant tunnelling induced noise, which might be a cause of the RIN degradation, was not observed.
Keywords :
distributed feedback lasers; laser noise; optical variables measurement; quantum cascade lasers; resonant tunnelling devices; semiconductor device measurement; semiconductor device models; semiconductor device noise; DFB-QCL; distributed-feedback quantum cascade laser; power 10 mW; relative intensity noise measurement; resonant tunnelling induced noise; semiclassical noise model; semiconductor laser; wavelength 1.55 mum; wavelength 5 mum;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20080795
