Semiconductor laser device and method for suppressing fabry perot oscillations
    94.
    发明授权
    Semiconductor laser device and method for suppressing fabry perot oscillations 失效
    半导体激光装置及其抑制方法

    公开(公告)号:US06750478B2

    公开(公告)日:2004-06-15

    申请号:US10252880

    申请日:2002-09-24

    IPC分类号: H01L3300

    摘要: A semiconductor laser device includes an active layer configured to radiate light, a light reflecting facet positioned on a first side of the active layer, and a light emitting facet positioned on a second side of the active layer thereby forming a resonator between the light reflecting facet and the light emitting facet. A diffraction grating is positioned within the resonator along a portion of the length of the active layer and the laser device is configured to operate as a multiple mode oscillation device. A window structure is provided between an end of the active layer and one of the light reflecting and light emitting facets, and the window structure is configured to reduce a reflectivity of the one of the light reflecting and light emitting facets.

    摘要翻译: 半导体激光器件包括被配置为辐射光的有源层,位于有源层的第一侧上的光反射小面和位于有源层的第二侧上的发光小面,从而在光反射面之间形成谐振器 和发光面。 衍射光栅沿有源层的长度的一部分位于谐振器内,并且激光器件被配置为作为多模式振荡器件工作。 在有源层的端部和光反射和发光小面中的一个之间提供窗口结构,并且窗口结构被配置为减小光反射和光发射面之一的反射率。

    Semiconductor laser devices, and semiconductor laser modules and optical communication systems using the same
    95.
    发明授权
    Semiconductor laser devices, and semiconductor laser modules and optical communication systems using the same 有权
    半导体激光器件和半导体激光器模块以及使用其的光通信系统

    公开(公告)号:US06614822B2

    公开(公告)日:2003-09-02

    申请号:US09776226

    申请日:2001-02-02

    IPC分类号: H01S500

    摘要: A semiconductor laser device and module for use in a dense wavelength division multiplexed optical communications system are shown. The laser device preferably has cavity lengths greater than 1000 &mgr;m, and compressive strain multi-quantum well active layer, and front-facet reflectivity of less than about 4%. Higher optical outputs and longer cavity lengths are achieved. Preferred modules use these laser diodes with external wavelength-selective reflectors that have narrow bandwidths of 3 nm or less, and which include a plurality of longitudinal mode subpeaks within the bandwidth. Relationships between reflectivity value of the front facet and the peak reflectivity of the wavelength-selective reflector for long cavity length laser device are also disclosed, with the relationships providing higher output power along with a stabilized output spectrum.

    摘要翻译: 示出了用于密集波分复用光通信系统的半导体激光器件和模块。 激光装置优选具有大于1000μm的空腔长度和压缩应变多量子阱活性层,并且前端反射率小于约4%。 实现更高的光输出和更长的腔长度。 优选的模块将这些激光二极管与具有3nm或更小的窄带宽的外部波长选择性反射器一起使用,并且其包括带宽内的多个纵向模式子峰。 还公开了用于长腔激光器件的前视面的反射率值与波长选择反射器的峰值反射率之间的关系,其中提供更高的输出功率以及稳定的输出光谱。

    Video and voice signal processing apparatus and sound signal processing
apparatus
    96.
    发明授权
    Video and voice signal processing apparatus and sound signal processing apparatus 失效
    视频和语音信号处理装置和声音信号处理装置

    公开(公告)号:US06049770A

    公开(公告)日:2000-04-11

    申请号:US186

    申请日:1998-05-29

    摘要: A video and voice signal processing apparatus is provided. The apparatus includes a signal receiving circuit for receiving an input signal containing a plurality of frames, each frame having an encoded voice signal block and an encoded video signal block. The signal receiving circuit separates the encoded voice signal block from the encoded video signal block in each frame. A voice signal processor converts the encoded voice signal block into a voice signal. Also included is a video extracting circuit which decimates a plurality of encoded video signal blocks and extracts one of the encoded video signal blocks as a representative video signal. A video signal processor converts the representative video signal into a video signal.

    摘要翻译: PCT No.PCT / JP97 / 01641 Sec。 371日期1998年5月23日 102(e)日期1998年5月23日PCT提交1997年5月15日PCT公布。 WO97 / 44953 PCT出版物 日期:1997年11月27日提供了视频和语音信号处理装置。 该装置包括用于接收包含多个帧的输入信号的信号接收电路,每个帧具有编码语音信号块和编码视频信号块。 信号接收电路将编码的声音信号块与编码视频信号块在每帧中分离。 语音信号处理器将编码的语音信号块转换成语音信号。 还包括一个视频提取电路,它对多个编码的视频信号块进行抽取,并将一个编码的视频信号块作为代表性视频信号提取。 视频信号处理器将代表性视频信号转换为视频信号。