Open AccessTwo-Segment Gain-Coupled Distributed Feedback Laser
Author(s) -
Feng Gao,
Li Qin,
Yong-Yi Chen,
Peng Jia,
Chao Chen,
Hong Chen,
Lei Liang,
Yu-Gang Zeng,
Xing Zhang,
Yong-Qiang Ning,
Ye-Jin Zhang,
Li-Jun Wang
Publication year - 2018
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2018.2791610
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
A two-segment regrowth-free gain-coupled distributed feedback (DFB) laser monolithically integrated different gain contrast segments was proposed, realizing both wavelength-tunable (5 nm) and wavelength stabilization characteristics, controlled by a single electrode only. At current larger than 320 mA, side mode suppression ratio reached >30 dB with 3 dB linewidth <80 pm. The CW power reached up to 159 mW/facet at single-mode operation. Considering both uncoated facets all together, it is at the same power level as index-coupled DFB lasers. Periodic surface grooves and 4-μ m-width ridge were patterned merely by one-step i-line lithography. It provides a novel method for low-cost practical gain-coupled DFB laser fabrication, which can be used in either/both wavelength-tunable applications such as sensing and detection, or/and wavelength stabilization fields such as pumping fiber lasers.