Ultra-short Wavelength Operation of a Thulium Doped Fiber Laser in the 1620-1660nm Wavelength Band. - S. Chen; Yongmin Jung; Shaif-Ul Alam; Saurabh Jain; M. Ibsen; R. Sidharthan; D. Ho; Seongwoo Yoo; David J. Richardson (OFC, 2018)