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首页> 外文会议>International symposium on photoelectronic detection and imaging;ISPDI 2011 >Line-width Compression of the Distributed Feedback Laser with an External Parallel Feedback Cavity
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Line-width Compression of the Distributed Feedback Laser with an External Parallel Feedback Cavity

机译：具有外部平行反馈腔的分布式反馈激光器的线宽压缩

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The distributed feedback laser (DFB) is a typical laser diode where the active region of the device is periodically structured as a diffraction grating. The output of a DFB laser has one single longitudinal mode and a relatively narrow line-width, usually several megahertz or one order less. However, applications such as coherent optical communication and accurate fiber sensing demand an even narrower line-width. An effective method for compressing a DFB laser is demonstrated. The line-width of a DFB laser, 200 KHz detected originally, is suppressed to sub kilohertz by adding an external parallel feedback cavity. The DFB laser is normatively designed but without the output isolator. The parallel feedback cavity is constructed by inserting several pieces of multimode fiber into a standard linear single-mode fiber cavity. In multimode fiber, each transverse mode has a different propagation constant. Equivalently, when a light beam propagates from single mode fiber to multimode fiber, it will split into a few parallel light paths with different propagation constants. The external cavity and DFB cavity form a compound resonant cavity for light beams. Lasing light in the compound cavity must fit the restrictions of all light paths, thus line-width of the final output is suppressed. When a passive external cavity is used, the line-width is suppressed to 1.25 KHz, detected by a delayed self-heterodyne interferometer with a 100km fiber delay line. By adding an erbium doped fiber amplifier (EDFA) into the external cavity for loss compensation, the result is updated to 430 Hz. This line-width suppressing method can be applied for other types of fiber lasers in a similar way. The parallel feedback mechanism is also suggested for general laser cavity designing to achieve ultra narrow line-width light source.
机译：分布式反馈激光器（DFB）是一种典型的激光二极管，其中器件的有源区被周期性地构造为衍射光栅。 DFB激光器的输出具有一个单一的纵向模式和相对较窄的线宽，通常为几兆赫兹或更小一个数量级。但是，诸如相干光通信和精确的光纤传感之类的应用要求更窄的线宽。说明了压缩DFB激光的有效方法。通过添加外部并行反馈腔，DFB激光器的线宽最初检测为200 KHz，可抑制到不足几千赫兹。 DFB激光器经过规范设计，但没有输出隔离器。并行反馈腔是通过将几根多模光纤插入标准线性单模光纤腔中而构成的。在多模光纤中，每个横向模具有不同的传播常数。等效地，当光束从单模光纤传播到多模光纤时，它将分裂为几个具有不同传播常数的平行光路。外腔和DFB腔形成用于光束的复合谐振腔。在复合腔中照射光必须符合所有光路的限制，因此最终输出的线宽受到抑制。当使用无源外腔时，线宽被抑制为1.25 KHz，这是由具有100 km光纤延迟线的延迟自外差式干涉仪检测到的。通过在外腔中添加掺（光纤放大器（EDFA）进行损耗补偿，结果将更新为430 Hz。这种线宽抑制方法可以类似的方式应用于其他类型的光纤激光器。还建议将并行反馈机制用于一般的激光腔设计，以实现超窄线宽光源。

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