A widely tunable dual-mode distributed feedback (DFB) laser fabricated by selective area growth (SAG) technology integrated with Ti heaters was demonstrated. In the device, an original mode spacing of 4 nm was obtained by the simple SAG technology. Ti thin-film heaters were integrated with a novel procedure, which simplifies the fabrication of such heaters greatly. A large electrical resistance of the heaters is obtained at the same time, resulting in a high wavelength tuning efficiency. An accurate mode spacing as small as 0.34 nm and as large as 8.06 nm is achieved, which corresponds to a wide beat frequency range from 42.2 GHz to 1 THz. The simple fabrication process indicates that it is promising for reducing the cost of dual-mode DFB laser in fabricating self-pulsation lasers and THz generators.
© 2013 Optical Society of America
Lasers and Laser Optics
Original Manuscript: June 17, 2013
Revised Manuscript: July 10, 2013
Manuscript Accepted: July 15, 2013
Published: August 8, 2013
Can Zhang, Song Liang, Hongliang Zhu, and Wei Wang, "Widely tunable dual-mode distributed feedback laser fabricated by selective area growth technology integrated with Ti heaters," Opt. Lett. 38, 3050-3053 (2013)