A narrow linewidth laser configuration based on distributed feedback fiber lasers\n(DFB-FL) with eight wavelengths in the international telecommunication union (ITU) grid is\npresented and realized. In this laser configuration, eight phase-shifted gratings in series are\nbidirectionally pumped by two 980-nm laser diodes (LDs). The final laser output with over 10-mW\npower for each wavelength can be obtained, and the maximum power difference within eight\nwavelengths is 1.2 dB. The laser configuration with multiple wavelengths and uniform power outputs\ncan be very useful in large scaled optical fiber hydrophone fields.
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