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Mode control of surface-emitting lasers using fib er Bragg grantings and its application to high-speed local area networks

光纤布拉格赠款面发射激光器的模式控制及其在高速局域网中的应用

基本信息

批准号：
12650385
负责人：
MIZUNAMI Toru
金额：
$ 1.92万
依托单位：
Kyushu Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650385/
关键词：
Surface-emitting laser fiber grating multimode fiber digital transmission ディジタルデータ伝送

项目摘要

A vertical-cavity surface-emitting laser (VCSEL) is a laser that emits light vertically to a semiconductor substrate. As the output beam has a circular profile, a VCSEL is advantageous to coupling with optical fibers. A VCSEL is suitable also for high-capacity parallel communication if they are arranged in a grid. On the other hand, a fiber Bragg grating (FBG) is a diffraction grating in an optical fiber formed by two intersecting ultraviolet laser beams. FBGs reflect light at Bragg wavelengths, and thus they have been applied for wavelength control of laser diodes. In this study, we couple an FBG with a VCSEL and demonstrate control of longitudinal modes and spectral narrowing. We studied optical fiber transmission using the VCSEL modulated with digital signals. In the experiment, we fabricated FBGs that have Bragg wavelengths in agreement with oscillation wavelengths of VCSELs. The Bragg wavelength was about 840 nm, the reflectivity was 30-40%, and the spectral width was 6-7 nm FWHM. Then, we coupled the FBGs to the VCSELs. Spectral widths ofVCSELs have decreased to half of those without FBGs. Such a narrowband laser has an application to optical communication or optical measurement.Next, we performed measurement on digital transmission characteristics with multimode optical fiber. For a fiber length of 1 km, the bit error rate decreased by using an FBG at a data rate of700 Mb/s, and decrease in the power penalty by 2dB was obtained. For an increased fiber length of 2 km, the bit error rate somewhat decreased at a data rate of 300-400 Mb/s by using an FBG. It is concluded that use of an FBG is effective for relatively short distance high-bit rate communication such as local area networks. The mechanism of the improvement is considered to be decrease in jitter, wavelength dispersion, and modal dispersion.

垂直腔面发射激光器（VCSEL）是将光垂直发射到半导体衬底的激光器。由于输出光束具有圆形轮廓，VCSEL有利于与光纤耦合。VCSEL也适用于高容量并行通信，如果它们被布置在网格中。另一方面，光纤布拉格光栅（FBG）是由两个相交的紫外激光束形成的光纤中的衍射光栅。FBG反射布拉格波长的光，因此它们已被应用于激光二极管的波长控制。在这项研究中，我们将FBG与VCSEL耦合，并演示了纵模和光谱窄化的控制。研究了数字调制VCSEL的光纤传输。在实验中，我们制作了布拉格波长与VCSEL振荡波长一致的FBG。布拉格波长约为840 nm，反射率为30- 40%，光谱宽度为6-7 nm FWHM。然后，我们将FBG耦合到VCSEL。VCSEL的光谱宽度减小到没有FBG的一半。这样的窄带激光器在光通信、光测量等方面具有应用价值。接下来，进行了多模光纤的数字传输特性的测量。当光纤长度为1 km时，采用700 Mb/s数据速率的光纤光栅可以降低误码率，并使功率损失降低2dB。对于2km的增加的光纤长度，通过使用FBG，在300-400 Mb/s的数据速率下误码率有所降低。它的结论是，使用光纤光栅是有效的相对短距离的高比特率通信，如局域网。改进的机制被认为是抖动、波长色散和模式色散的减小。