High-Power Optical Fiber Amplifier by 1480 nm Wavelength Multiplexed Pumping

This paper describes a 1.5-W signal output power Erbium Doped Fiber Amplifier (EDFA) employinga threechannel wavelength division-multiplexing technique with wavelength stabilized 1480 nm pump lasers by Fiber Bragg Grating (FBG) as an external cavity. The power conversion efficiency of total launched pump power to output signal power was 59% and the slope efficiency was 72%. We achieved more than 1 watt outputs over a 30 nm of signal wavelength range. The structure and recent data of high-power 1480 nm laser modules with FBG are introduced. We show the latest demonstration of a low loss (>0.9dB) 7.5 nm-spacing eightwavelength PLC (Planar Lightwave Circuit) -MZI (Mach-Zehnder Interferometer) multiplexer for 1480 nm band high-power pumping unit.