A multispectral linear.optical sweep source, based on tunable InGaN/GaN QW LEDs

作者：Biswas Dipankar^*; Gorai Anup; Mistry Apu

来源：Optik, 2018, 158: 688-692.

DOI：10.1016/j.ijleo.2017.12.156

• Optical sweep
• Tunable InGaN/GaN QW LED
• Programmable counter
• EPROM Digital to analog converter

Applications of multispectral sources are numerous. The previous forms of optical sources are continuously being replaced by efficient LEDs with an emphasis on III-nitrides, since it covers a very wide optical range. In this paper, we are proposing a multispectral linear optical sweep source, based on tunable InGaNIGaN QW LEDs. For linearization, a lambda verses current curve of tunable InGaN/GaN QW LED, as obtained from our well established method of solution of Schrodinger and Poisson equations is considered as a model. The entire process of linearization is outlined in a simple form, for clear understanding. The linear sweep is so designed that it can be stopped at any lambda,. i.e. color. Changing of the range of the spectral sweep through changes in the device parameters is pointed out. Procedures, necessary constituents and results are presented with suitable discussions. The multispectral ramp should be of much use for a wide range of applications.

• 出版日期2018