Switchable Dual-Wavelength Synchronously Q-Switched Erbium-Doped Fiber Laser Based on Graphene Saturable Absorber Wang, Z. T. ; Chen, Y. ; Zhao, C. J. ; Zhang, H. ; Wen, S. C. Abstract Publication: IEEE Photonics Journal Pub Date: June 2012 DOI: 10.1109/JPHOT.2012.2199102 Bibcode: 2012IPhoJ...4..869W