Design and evaluation of high speed DBR lasers for analog and digital transmission

5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003. Pub Date : 2003-11-17 DOI:10.1109/LFNM.2003.1246067

R. Schatz, O. Kjebon, M. N. Akram

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引用次数: 3

Abstract

The directly modulated laser is a simple and reliable source for high speed optical transmission of information. It is especially useful in medium to short distance digital links (e.g. metropolitan and local area networks) where the excess pulse dispersion due to laser chirp is not a critical issue. The linear current to light conversion makes it also interesting for transmission of analogue signals over fiber (CATV and microwave links). In both cases a high bandwidth is needed in order to maximize the transmission capacity and retain good distortion characteristics. For single section DFB lasers with low electrical parasitics, the bandwidth is mainly determined by the differential gain of the active material. There has been little progress in improving this material parameter lately beyond what was achieved with the introduction of strained quantum wells. A theoretical and experimental investigation of another approach to further improve the modulation bandwidth, namely by utilizing the dispersive feedback from a detuned Bragg grating in a DBR laser.

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用于模拟和数字传输的高速DBR激光器的设计与评价

直接调制激光器是一种简单可靠的高速光信息传输光源。它在中短距离数字链路(例如城域网和局域网)中特别有用，其中由于激光啁啾引起的多余脉冲色散不是一个关键问题。线性电流到光的转换使得通过光纤(有线电视和微波链路)传输模拟信号也很有趣。在这两种情况下，为了最大限度地提高传输容量并保持良好的失真特性，都需要高带宽。对于低电寄生的单截面DFB激光器，其带宽主要由活性材料的差分增益决定。除了引入应变量子阱所取得的成就外，最近在改进这一材料参数方面几乎没有取得进展。本文从理论和实验两方面研究了另一种进一步提高调制带宽的方法，即利用DBR激光器中失谐布拉格光栅的色散反馈。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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5th International Workshop on Laser and Fiber-Optical Networks Modeling, 2003. Proceedings of LFNM 2003.

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