Proposal for common active 1.3-μm quantum dot electroabsorption modulated DFB laser

Sobhani, S. A. , Stevens, B. J., Babazadeh, N., Takemasa, K., Nishi, K., Sugawara, M., Hogg, R. A. and Childs, D. T.D. (2019) Proposal for common active 1.3-μm quantum dot electroabsorption modulated DFB laser. IEEE Photonics Technology Letters, 31(6), pp. 419-422. (doi: 10.1109/LPT.2018.2890641)

Abstract

Opportunities for the monolithic integration of a novel common quantum dot (QD)-active electroabsorption modulated laser are explored. An electric-field and temperature-dependent spectroscopic study of optical absorption and gain are presented in the state-of-the-art 1.3-μm In(Ga)As/GaAs QD active material. The unique gain/absorption spectral shape, attributed to the QD's density of states, allows for a number of possible modulation schemes dependent upon the selected laser wavelength detuning from the gain peak. Intensity modulation and change in absorption, leading to negative chirp operation, are demonstrated via absorption spectroscopy and gain measurement of eight-layer-stack QD-active material. Such a device would be able to provide positive or negative chirp dependent upon modulation scheme and gain/Bragg wavelength detuning.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Childs, Dr David and Hogg, Professor Richard and Ali Sobhani, Mr Soroush and Babazadeh, Dr Nasser
• Authors: Sobhani, S. A., Stevens, B. J., Babazadeh, N., Takemasa, K., Nishi, K., Sugawara, M., Hogg, R. A., and Childs, D. T.D.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: IEEE Photonics Technology Letters
• Publisher: IEEE
• ISSN: 1041-1135
• ISSN (Online): 1941-0174
• Published Online: 01 January 2019