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Research on Semiconductor-Fiber Composite Cavity Tunable Lasers

Author: HaoXiuQing
Tutor: ChenGenXiang
School: Beijing Jiaotong University
Course: Optical communication with the mobile communication
Keywords: A semiconductor laser Traveling-wave rate equation Time Domain Transfer matrix method Frequency Domain Filter Sampled grating
CLC: TN248.4
Type: Master's thesis
Year: 2011
Downloads: 65
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Abstract


Today, semiconductor laser technology has become more sophisticated, and its application in optical communication networks gradually increased, but with a variety of emerging technologies, especially wavelength division multiplexing (WDM) optical communication technology in the field of a wide range of applications, making people laser light as a communication and put forward higher requirements. Based on the Semiconductor - fiber composite cavity (SFCC) tunable laser structure principle and performance of a detailed analysis, elaborated a relatively effective solution. The tunable laser is a Fabry-Perot type semiconductor laser (FPLD) as the core, the use of optical fiber, and other devices to construct a filter having a filtering effect of the annular chamber, in order to achieve a narrow band of laser output, by adjusting the filter can achieve a wide range tuning. This laser optical communication system can meet the data transmission capacity and speed requirements, so has a very good development prospects. Firstly, the basic theory for FPLD carried out a detailed analysis, and on this basis, explaining its working principle, thereby establishing a one-dimensional laser on SFCC theoretical model, and then the laser through numerical methods in time domain and frequency domain characteristics do in-depth research, the specific steps are as follows: 1. firstly discusses the basic theory of semiconductors, its material gain and spontaneous emission characteristics analysis and research, and draw the corresponding analytical expressions. Then described in detail the structure and working principle FPLD, and deduced based on random light field electromagnetic cavity traveling wave equation and expanded carrier rate equation. (2) describes the SFCC basic components of a tunable laser structure and working mechanism. Meanwhile a brief introduction about FP filter and other related characteristics of the device and its impact on the entire system. 3 using the distribution of time-domain algorithm SFCC one-dimensional wave laser rate equations for numerical operations, and on this basis to solve (through matlab simulation), to analyze the dynamic operating characteristics, such as the carrier concentration in time and such variation of the space. 4 time domain dynamic simulation results as a frequency-domain analysis SFCC tunable laser output spectral characteristics of the initial value, and the use of extended matrix method to establish the frequency domain model to analyze the characteristics of the output spectrum, this is because of the direct laser as frequency for SFCC Domain analysis is relatively difficult. SFCC after this basis will tunable laser instead sampled grating filter portion to achieve, better spectral output can be obtained, and better tuning characteristics. This article will use two different combination consisting of sampled grating tunable narrow-band filter. First, the conditions and uniform Bragg grating coupled-mode theory was derived. Then a brief introduction to the principles of sampled grating, and on the amplitude of the sampled grating reflection spectrum is analyzed and studied. Then use two different rectangles amplitude sampled grating tunable narrowband filter combination, and analyzes the feasibility. Finally its application to SFCC laser, through the process simulation comparison of the two filters filtering and tuning characteristics.

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