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    • 3. 发明授权
    • Distributed feedback laser device high in coupling efficiency with optical fiber
    • 分布式反馈激光器件与光纤耦合效率高
    • US06259718B1
    • 2001-07-10
    • US09199789
    • 1998-11-25
    • Tetsuro Okuda
    • Tetsuro Okuda
    • H01S308
    • H01S5/12H01S5/1014H01S5/1064H01S5/1206H01S5/1215
    • A distributed feedback laser device comprises an optical waveguide having one end facet serving as a beam emission surface and the other end facet serving as a reflection surface, an active layer formed between the beam emission surface and the reflection surface, and a diffraction grating formed so as to extend along the active layer in the optical waveguide. The active layer has a first region located nearer to the beam emission surface than to the reflection surface and a second region located nearer to the reflection surface than to the beam emission surface. The first region is narrower in width than the second region. The diffraction grating has first and second portions located along the first and the second regions, respectively. The first portion is longer in pitch than the second portion.
    • 分布式反馈激光装置包括一个光波导,其具有一个端面用作光束发射表面,另一个端面用作反射表面,形成在光束发射表面和反射表面之间的有源层,以及形成为衍射光栅的衍射光栅 以沿着光波导中的有源层延伸。 有源层具有比反射表面更靠近光束发射表面的第一区域和位于比反射表面更靠近反射表面的第二区域。 第一区域的宽度比第二区域窄。 衍射光栅具有分别沿着第一和第二区域设置的第一和第二部分。 第一部分的间距比第二部分长。
    • 6. 发明授权
    • Distributed-feedback laser with improved analog modulation distortion
characteristics and method for fabricating the same
    • 具有改进的模拟调制失真特性的分布反馈激光器及其制造方法
    • US5394429A
    • 1995-02-28
    • US144038
    • 1993-11-01
    • Hirohito YamadaTetsuro OkudaToshitaka Torikai
    • Hirohito YamadaTetsuro OkudaToshitaka Torikai
    • H01S5/10H01S5/12H01S5/20H01S5/227H01S3/08
    • H01S5/12H01S5/1064H01S5/1206H01S5/1215H01S5/1225H01S5/2077H01S5/2272H01S5/2277
    • A distributed-feedback laser has a diffractive grating, an optical waveguide layer, and an active region. The optical waveguide layer has equivalent refractive indexes larger towards cavity end facets and smaller towards a device center portion along a cavity. The active region containing the optical waveguide layer has widths wider towards the cavity end facets and narrower towards the device center portion along the cavity. The optical waveguide layer has a uniform electric intensity distribution along the cavity to improve the linearity of current versus optical output characteristics. In another arrangement, the optical waveguide layer formed on the diffractive grating has in its compositions longer wavelengths towards the cavity end facets and shorter wavelengths towards the cavity center portion along the cavity, whereby the optical waveguide layer has a uniform optical intensity distribution along the cavity to improve the linearity of current versus optical output characteristics. The distributed-feedback laser provided is with improved analog modulation distortion characteristics.
    • 分布反馈激光器具有衍射光栅,光波导层和有源区。 光波导层具有相对于腔端面较大的等效折射率,并且朝着沿腔的器件中心部分较小。 包含光波导层的有源区域具有朝向腔体端面更宽的宽度,并且沿着空腔朝向器件中心部分较窄。 光波导层沿着空腔具有均匀的电强度分布,以提高电流对光输出特性的线性度。 在另一种布置中,形成在衍射光栅上的光波导层在其组成中具有朝向空腔端面的较长波长和沿着空腔朝向空腔中心部分的较短波长,由此光波导层沿着空腔具有均匀的光强度分布 以提高电流对光输出特性的线性度。 提供的分布式反馈激光器具有改进的模拟调制失真特性。
    • 8. 发明申请
    • BOUNDARY ACOUSTIC WAVE FILTER AND MULTIPLEXER HAVING THE SAME
    • 边界声波滤波器和具有它的多路复用器
    • US20110063047A1
    • 2011-03-17
    • US12880248
    • 2010-09-13
    • Tetsuro OKUDA
    • Tetsuro OKUDA
    • H03H9/72H03H9/64
    • H03H9/725H03H9/0222H03H9/02929H03H9/14573
    • A boundary acoustic wave filter includes an input terminal, an output terminal, a boundary acoustic wave filter unit connected between the input terminal and the output terminal, and a boundary acoustic wave resonator that is connected between the input terminal and the boundary acoustic wave filter unit and includes a piezoelectric substrate, a dielectric layer formed on the piezoelectric substrate, and an IDT electrode that is disposed at a boundary between the piezoelectric substrate and the dielectric layer and has a pair of comb-shaped electrodes interdigitated with each other. The number of pairs of electrode fingers in the IDT electrode in the boundary acoustic wave resonator is in a range of approximately 57.5 to approximately 77.5.
    • 一种边界声波滤波器,包括输入端子,输出端子,连接在输入端子和输出端子之间的边界声波滤波器单元,以及连接在输入端子和声界面波滤波器单元之间的边界声波谐振器 并且包括压电基板,形成在压电基板上的电介质层和设置在压电基板和电介质层之间的边界处并具有彼此交叉指向的一对梳状电极的IDT电极。 边界弹性波谐振器中的IDT电极中的电极指的对数在约57.5至约77.5的范围内。