A two-section offset quantum-well structure tunable laser with a tuning range of 7 nm was fabricated using offset quantum-well method. The distributed Bragg reflector (DBR) was realized just by selectively wet etching the multiquantum-well (MQW) layer above the quaternary lower waveguide. A threshold current of 32 mA and an output power of 9 mW at 100 mA were achieved. Furthermore, with this offset structure method, a distributed feedback (DFB) laser was integrated with an electro-absorption modulator (EAM), which was capable of producing 20 dB of optical extinction.
© 2005 Chinese Optics Letters
Qiang Kan, Ying Ding, Lingjuan Zhao, Hongliang Zhu, Fan Zhou, Lufeng Wang, Baojun Wang, and Wei Wang, "Offset quantum-well method for tunable distributed Bragg reflector lasers and electro-absorption modulated distributed feedback lasers," Chin. Opt. Lett. 3, 455-456 (2005)