Analysis of wavelength-tunable DFB laser based on GaN in communication band

ZHU Minjie; HU Fangren; YANG Haiyan

doi:10.7510/jgjs.issn.1001-3806.2016.01.013

In order to control laser wavelengths output of laser by suspending period-adjustable gratings, a structure combining microdriver of micro-electro-mechanical system(MEMS) technology with grating of distributed feedback (DFB) laser was proposed. According to rigorous coupled-wave theory (RCWA) and medium slab waveguide theory, using infinite element software COMSOL, a two-dimensional steady physical model of wavelength-adjustable DFB laser based on GaN was constructed for C-band in optical communication. 2-D electric field mode picture and lasing wavelength linewidth picture at 1550nm were analyzed and the corresponding relationship between grating period and lasing wavelength was gotten. The results show that, with certain structural parameters such as grating lattice thickness, height and gain layer thickness, lasing wavelength and grating period present similar linear relationships being consistent with theoretical analysis. The study will give good theoretical guidance for carrying out the design and preparation of the device.

Analysis of wavelength-tunable DFB laser based on GaN in communication band

Corresponding author: HU Fangren, hufr@njupt.edu.cn;

1. College of Photoelectronic Engineering, Nanjing University of Posts and Communications, Nanjing 210046, China

Received Date: 2014-11-20

Accepted Date: 2014-12-09

Available Online: 2016-01-25

Abstract: In order to control laser wavelengths output of laser by suspending period-adjustable gratings, a structure combining microdriver of micro-electro-mechanical system(MEMS) technology with grating of distributed feedback (DFB) laser was proposed. According to rigorous coupled-wave theory (RCWA) and medium slab waveguide theory, using infinite element software COMSOL, a two-dimensional steady physical model of wavelength-adjustable DFB laser based on GaN was constructed for C-band in optical communication. 2-D electric field mode picture and lasing wavelength linewidth picture at 1550nm were analyzed and the corresponding relationship between grating period and lasing wavelength was gotten. The results show that, with certain structural parameters such as grating lattice thickness, height and gain layer thickness, lasing wavelength and grating period present similar linear relationships being consistent with theoretical analysis. The study will give good theoretical guidance for carrying out the design and preparation of the device.

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Reference (15)

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Analysis of wavelength-tunable DFB laser based on GaN in communication band

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