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Design and Analysis of Mode-hop-free Tunable Laser Based on Etched Diffraction Grating

Author: ZengRuiXing
Tutor: HeJianJun
School: Zhejiang University
Course: Optical Communication Technology
Keywords: Semiconductor laser Integrated Optics Etched diffraction grating
CLC: TN248
Type: Master's thesis
Year: 2010
Downloads: 50
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Abstract

With the development of photonics technology, microelectronic technology, communications technology, computer science and technology, and automation technology, modern society has entered the era of information, intelligence. Semiconductor lasers as produce excellent light source for optical signal technology, has been the focus of various countries in the world. Since the birth of the first semiconductor laser in the 1860s began, the very rapid development of semiconductor technology, and gradually form a semiconductor optoelectronics, integrated optics, guided wave optics branch of science. With the gradual development of related technologies, the semiconductor laser multiple large number of applications in the field of optical fiber communication, optical sensing, optical storage, optical information processing. Optical fiber communication and business development, increasing system capacity and intelligence requirements. WDM technology can easily upgrade the capacity of the fiber optic cable, an optical add-drop multiplexer (OADM) and optical cross-connect (OXC) can well improve the degree of intelligent optical network. The wide range of wavelength-tunable semiconductor laser is the key to implement these techniques. In addition, many applications such as optical sensing and spectroscopy also need tunable semiconductor laser mode-hop, such as wavelength scanning interferometry mode transition will affect the location of the measurement accuracy and spatial resolution. The work of this paper is to propose a tunable laser etched diffraction grating structure-based mode-hop wavelength. Many wavelength tunable laser structure already exists, and some can not be achieved due to structural defects wavelength continuously adjustable laser mode-hop design, some ignore the absence of great importance. In order to achieve the wavelength tuning of the mode-hop, constitutes a laser resonator tuning speed must be consistent and selected wavelength modes grating tuning speed. Some monolithic integrated device with two electrodes and complex synchronization algorithm to achieve mode-hop free wavelength tuning, which makes tuning the complex structure limits the tuning speed. Some use of complex adjustable double-waveguide structure to achieve mode-hop free wavelength tuning, but the entire production process takes complex etching and growth process. This paper presents a novel single electrode can achieve mode hop free tuning of the laser structure, which comprises an active waveguide to provide a laser gain, and an etched diffraction grating as a dispersive element to select wavelengths, and a freedom of etching the diffraction grating mode-hop-free tuning of the tuner of the diffraction area, the shape of the zone by the special design of tuning, can be realized the single electrode. Mode-hop wavelength tunable lasers, mode-hop premise laser side mode suppression ratio and tuning range are two very important performance indicators. These specific configuration parameters need to be carefully designed laser. This article using the single point method to the design of the various parameters of the etching of the diffraction grating, to optimize the design of tuning the shape of the area, given the length of the active waveguide of a gain, a wide tuning range can be realized so that within a given current range. Also research active passive waveguide integrated solution, given the waveguide parameters and simulation results prove that a good coupling efficiency and single-mode characteristics of light waves in the coupling process. Finally, the article discusses the mask based laser etched diffraction grating structure design and production processes, and then discussed the production process of the semiconductor integrated optoelectronic devices, including film cleaning, lithography, metal sputtering, peeling, dry etching get better experimental results, these successful production mode-hop free laser helpful.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser
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