A fiber-grating external-cavity-laser (FG-ECL) is expected as a useful light source in optical fiber communication systems.~(1-3) Its oscillation wavelength is determined by a reflection peak wavelength of the fiber grating. The wavelength controllability of fiber gratings is in the order of subnanometrs, so the FG-ECL could be especially useful in dense wavelength-division multiplexing (WDM) systems where precise wavelength control of lasers are required. Utilizing a four-channel fiber grating array,we obtained a four-channel multiwavelength oscillation with 1-nm spacing, which demonstrated the feasibility of the FG-ECL as the WDM light source.
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