An Eight-Wavelength BH DFB Laser Array With Equivalent Phase Shifts for WDM Systems

• Published in: IEEE photonics technology letters Vol. 26; no. 16; pp. 1593 - 1596
• Main Authors: Jingsi Li, Song Tang, Wang, Jeffery, Yue Liu, Xiangfei Chen, Julian Cheng
• Format: Journal Article
• Language: English
• Published: New York IEEE 15.08.2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Arrays; Distributed feedback devices; Gratings; Laser modes; Laser tuning; Lasers; Semiconductor laser arrays; Wave division multiplexing; semiconductor laser arrays; wavelength division multiplexing; Distributed feedback laser; photonic integrated circuits
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2014.2327113

In this letter, we report an eight-wavelength monolithically integrated buried heterostructure distributed feedback laser array with quarter-wave equivalent phase shifts. The laser array operating at 1.3 μm has a chip size of 2 mm × 250 μm. Lasing channel spacing is designed to be 800 GHz (~4.6 nm at 1.3 μm). The laser array exhibits accurate wavelength control and stable single mode lasing operation over a wide range of injection currents and different ambient temperatures. The measured linewidth of these lasers is 278 kHz at 65-mA bias current. In addition, the lasing wavelength of the whole laser array can be tuned continuously over 38.3 nm without mode hopping. The proposed method offers a practical approach of integrated laser array fabrication for wavelength-division multiplexing systems.