V型腔可調諧半導體激光器啁啾特性研究
發(fā)布時間：2018-08-23 08:41
【摘要】：信息交流在人們工作、生活和學習中發(fā)揮著越來越重要的作用。在未來的光通信網中,制作工藝、調制格式簡單,波長可調諧,具有良好傳輸性能的半導體激光器將是必不可少的器件。直接幅度調制和電吸收調制以及馬赫-曾德爾電光相位調制等外調制方式相比,是最簡單、成本最低的一種調制格式。然而,半導體激光器的直接幅度調制通常伴隨著人們不希望具有的正頻率啁啾現象。調制信號在1550nm標準正色散單模光纖中傳輸時,正頻率啁啾會使信號的脈沖展寬,這將嚴重限制光纖通信系統(tǒng)的傳輸速率和傳輸距離。人們渴望得到可以在密集波分復用城域網使用的具有波長可調諧功能和負啁啾特性的光發(fā)射機。本文首次發(fā)現并證實了直接調制可調諧半導體激光器的負啁啾現象。本文研究的多電極結構的直接調制可調諧V型腔激光器,在調制過程中,其有源區(qū)的載流子密度與輸出光功率發(fā)生了巧妙地反向變化。因此,V型腔激光器輸出的光信號具有負啁啾特性,從而實現了人們期盼已久的愿望。本文首先用時域行波模型模擬分析了直接調制過程中V型腔激光器的載流子密度與輸出光功率之間的動態(tài)變化關系,從理論上說明了負啁啾的正確性；其次用光帶通濾波方法測量了V型腔激光器的時域動態(tài)啁啾,從實驗上測得了負啁啾結果,得到了與模擬分析一致的結論；最后分析了V型腔激光器的負啁啾特性對光信號在G.652標準單模光纖中色散的部分補償作用,進一步證實了V型腔激光器的負啁啾特性。具有制作簡單、結構緊湊、波長可調諧和直接調制負啁啾特性的V型腔激光器在未來光通信網中必將會有廣闊的應用前景。
[Abstract]:Information exchange plays a more and more important role in people's work, life and study. In the future optical communication networks, semiconductor lasers with simple modulation format, tunable wavelength and good transmission performance will be essential devices. Compared with direct amplitude modulation (DAM), electroabsorption modulation (EAM) and Mach Zehnder electro-optic phase modulation (EOPM), it is the simplest and least cost modulation scheme. However, the direct amplitude modulation of semiconductor laser is usually accompanied by the chirp of positive frequency which people do not want. When the modulated signal is transmitted in the 1550nm standard normal-dispersion single-mode fiber, the positive frequency chirp will widen the pulse of the signal, which will seriously limit the transmission rate and transmission distance of the optical fiber communication system. It is desirable to obtain wavelength tunable optical transmitters with negative chirp characteristics that can be used in dense wavelength division multiplexing metropolitan area networks (DWDM). In this paper, the negative chirp of direct modulation tunable semiconductor lasers is first found and verified. In the process of modulation, the carrier density of the active region and the output optical power of the direct-modulated tunable V-cavity laser with multi-electrode structure have been ingeniously reversed. Therefore, the optical signal produced by the V-cavity laser has negative chirp characteristics, thus realizing the long-awaited desire. In this paper, the time-domain traveling wave model is used to simulate and analyze the dynamic relationship between carrier density and output optical power of V-cavity laser during direct modulation, and the correctness of negative chirp is explained theoretically. Secondly, the time-domain dynamic chirp of V-cavity laser is measured by optical band-pass filtering method. The negative chirp results are measured experimentally and the results are in agreement with the simulation analysis. Finally, the negative chirp characteristic of V-cavity laser is analyzed to compensate the dispersion of optical signal in G. 652 standard single-mode fiber. The negative chirp characteristic of V-cavity laser is further confirmed. The V-cavity laser with simple fabrication, compact structure, tunable wavelength harmonic and direct modulation negative chirp will have a broad application prospect in the future optical communication network.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248.4
本文編號：2198515
[Abstract]:Information exchange plays a more and more important role in people's work, life and study. In the future optical communication networks, semiconductor lasers with simple modulation format, tunable wavelength and good transmission performance will be essential devices. Compared with direct amplitude modulation (DAM), electroabsorption modulation (EAM) and Mach Zehnder electro-optic phase modulation (EOPM), it is the simplest and least cost modulation scheme. However, the direct amplitude modulation of semiconductor laser is usually accompanied by the chirp of positive frequency which people do not want. When the modulated signal is transmitted in the 1550nm standard normal-dispersion single-mode fiber, the positive frequency chirp will widen the pulse of the signal, which will seriously limit the transmission rate and transmission distance of the optical fiber communication system. It is desirable to obtain wavelength tunable optical transmitters with negative chirp characteristics that can be used in dense wavelength division multiplexing metropolitan area networks (DWDM). In this paper, the negative chirp of direct modulation tunable semiconductor lasers is first found and verified. In the process of modulation, the carrier density of the active region and the output optical power of the direct-modulated tunable V-cavity laser with multi-electrode structure have been ingeniously reversed. Therefore, the optical signal produced by the V-cavity laser has negative chirp characteristics, thus realizing the long-awaited desire. In this paper, the time-domain traveling wave model is used to simulate and analyze the dynamic relationship between carrier density and output optical power of V-cavity laser during direct modulation, and the correctness of negative chirp is explained theoretically. Secondly, the time-domain dynamic chirp of V-cavity laser is measured by optical band-pass filtering method. The negative chirp results are measured experimentally and the results are in agreement with the simulation analysis. Finally, the negative chirp characteristic of V-cavity laser is analyzed to compensate the dispersion of optical signal in G. 652 standard single-mode fiber. The negative chirp characteristic of V-cavity laser is further confirmed. The V-cavity laser with simple fabrication, compact structure, tunable wavelength harmonic and direct modulation negative chirp will have a broad application prospect in the future optical communication network.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248.4
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