Switchable quadruple-wavelength erbium-doped photonic crystal fiber laser based on a polarization-maintaining photonic crystal fiber Sagnac loop filter.

Abstract: A switchable quadruple-wavelength erbium-doped photonic crystal fiber laser is proposed and demonstrated experimentally by employing a simple linear cavity configuration incorporating a polarization-maintaining photonic crystal fiber Sagnac loop filter. The laser can be switched flexibly from single-wavelength to quadruple-wavelength by adjusting a polarization controller and all of lasing lines locate at fixed wavelength positions in the range of 1556nm to 1560nm. The laser individually has a kind of single wavelength and quadruple-wavelength output mode. It also has three and two kinds of dual-wavelength and triple-wavelength output modes, respectively. The laser with good intensity uniformity exhibits excellent wavelength and power stabilities in the experiment. [Copyright &y& Elsevier]