K. Shiba, T. Okuda, Y. Muroya, N. Suzuki, H. Yamada, and T. Torikai, "Spot-size expanded 1.3-µm partially corrugated waveguide laser diodes with laterally tapered active stripe and chirped grating,"
in Optical Fiber Communication Conference,
Vol. 2 of 1998 OSA Technical Digest Series
(Optical Society of America, 1998), paper FB3.