W. S. Ring, S. Wrathall, A. J. Taylor, and C. A. Park, "Effect of reflections on unisolated 2.5 Gbit/s gain-coupled 1300-nm DFBs over the -20°C to +85°C temperature range,"
in Optical Fiber Communication Conference,
Vol. 2 of 1998 OSA Technical Digest Series
(Optical Society of America, 1998), paper TuB5.