Multimode external cavity semiconductor lasers
    8.
    发明申请
    Multimode external cavity semiconductor lasers 审中-公开
    多模外腔半导体激光器

    公开(公告)号:US20060002443A1

    公开(公告)日:2006-01-05

    申请号:US10883423

    申请日:2004-06-30

    IPC分类号: H01S5/00 H01S3/08 H01S3/10

    摘要: External cavity laser devices provide multimode laser operation by using a wavelength selective element that produces a spectral width profile able to support multiple longitudinal laser modes. The spectral width profile, for example, may have a substantially flat response across multiple longitudinal laser modes, such that no single mode predominates. The wavelength selective elements may be gratings written in waveguides, where the grating's bandwidth as well as the laser cavity length set the number of supported longitudinal laser modes. In some examples, a tuning element may be used to adjust device operation. In further examples, a laser gain region and the wavelength selective element may be angled with respect to adjacent coupling facets to reduce reflection losses within the laser cavity.

    摘要翻译: 外腔激光器件通过使用产生能够支持多个纵向激光​​模式的光谱宽度分布的波长选择元件提供多模激光器操作。 例如,光谱宽度分布可以具有跨多个纵向激光​​模式的基本上平坦的响应,使得没有单一模式占优势。 波长选择元件可以是写在波导中的光栅,其中光栅的带宽以及激光腔长度设置支持的纵向激光模式的数量。 在一些示例中,可以使用调谐元件来调整设备操作。 在另外的示例中,激光增益区域和波长选择元件可以相对于相邻的耦合面成一角度,以减少激光腔内的反射损耗。

    Method and apparatus for optical amplifier gain and noise figure
measurement
    9.
    发明授权
    Method and apparatus for optical amplifier gain and noise figure measurement 失效
    用于光放大器增益和噪声系数测量的方法和装置

    公开(公告)号:US6016213A

    公开(公告)日:2000-01-18

    申请号:US676561

    申请日:1996-07-08

    IPC分类号: H04B10/08 H04B10/02

    CPC分类号: H04B10/0731 H04B10/07

    摘要: An improved method of measurement of noise figure and gain of optical amplifiers is based on transforming the amplifier into an oscillator by applying optical feedback with known loss. The feedback consists of a tunable filter for wavelength control and of a variable attenuator for gain control. Measuring the output power at a given wavelength and the noise characteristics of the output signal, either with an optical spectrum analyzer or with a set of tunable filters and a power meter, provides data for full characterization of the optical amplifier. Another method is disclosed that utilizes the self-heterodyne setup and electrical spectrum analyzer to measure the spectral line width of the lasing amplifier, from which the noise figure is derived.

    摘要翻译: 改进的光放大器噪声系数和增益的测量方法是基于通过应用具有已知损耗的光学反馈将放大器转换为振荡器。 反馈由用于波长控制的可调谐滤波器和用于增益控制的可变衰减器组成。 使用光谱分析仪或一组可调滤波器和功率计测量给定波长的输出功率和输出信号的噪声特性,为光放大器的全面表征提供数据。 公开了另一种利用自外差设置和电频谱分析仪来测量激光放大器的谱线宽度的方法,由此导出噪声系数。