A novel (to our knowledge) dual-core ytterbium ( ${\mathrm{Yb}}^{3+}$ ) doped fiber, as an optically pumped amplifier, boosts the output power from a $1060\mathrm{nm}$ swept source laser beyond $250\mathrm{mW}$ , while providing a wavelength tuning range of $93\mathrm{nm}$ , for optical coherence tomography (OCT) imaging. The design of the dual-core Yb-doped fiber amplifier and its multiple wavelength optical pumping scheme to optimize output bandwidth are discussed. Use of the dual-core fiber amplifier showed no appreciable degradation to the coherence length of the seed laser. The signal intensity improvement of this amplifier is demonstrated on a multichannel in vivo OCT imaging system at $1060\mathrm{nm}$ .

© 2011 Optical Society of America

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