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    • 5. 发明授权
    • Optical semiconductor device with InP
    • 带InP的光学半导体器件
    • US5912475A
    • 1999-06-15
    • US767924
    • 1996-12-17
    • Takushi ItagakiDaisuke SuzukiTatsuya Kimura
    • Takushi ItagakiDaisuke SuzukiTatsuya Kimura
    • G02F1/025H01S5/00H01S5/0625H01L33/00
    • H01S5/06258
    • An optical semiconductor device includes an n-type InP substrate having top and bottom surfaces; a stripe-shaped mesa structure including an n-type cladding layer, a multi quantum well layer, and a p-type first upper cladding layer disposed on the top surface of the substrate; a first layer of a semi-insulating material, an n-type InP hole blocking layer having a carrier concentration equal to or less than 4.times.10.sup.18 cm.sup.-3 and more than 1.times.10.sup.18 cm.sup.-3, and a second layer of the semi-insulating material disposed burying the mesa structure; a second p-type cladding layer and a p-type contact layer disposed on the mesa structure and on the second layer of the semi-insulating material, and p side electrodes spaced from each other in a stripe direction of the mesa structure, disposed on the p-type contact layer; and an n side electrode disposed on the bottom surface of the substrate. Therefore, an optical semiconductor device is available which has superior element isolation characteristics and broad modulation bandwidth, and enables the individual elements to operate with the utmost performance.
    • 光学半导体器件包括具有顶表面和底表面的n型InP衬底; 包括n型包覆层,多量子阱层和设置在衬底的顶表面上的p型第一上包层的条状台面结构; 半绝缘材料的第一层,载流子浓度等于或小于4×10 18 cm -3且大于1×10 18 cm -3的n型InP空穴阻挡层和设置在所述半绝缘材料上的第二层 埋葬台面结构; 设置在半绝缘材料的台面结构和第二层上的第二p型覆层和p型接触层,以及在台面结构的条带方向上彼此隔开的p侧电极,设置在 p型接触层; 以及设置在基板的底面上的n侧电极。 因此,可获得具有优异的元件隔离特性和宽调制带宽的光学半导体器件,并且能够使各个元件以最大的性能进行操作。
    • 7. 发明授权
    • Optical fiber
    • 光纤
    • US4204745A
    • 1980-05-27
    • US914548
    • 1978-06-12
    • Junichi SakaiTatsuya Kimura
    • Junichi SakaiTatsuya Kimura
    • G02B6/00C03B37/018G02B6/028G02B5/14
    • G02B6/0288C03B37/018C03B2203/26
    • In a graded index optical fiber whose refractive index distribution (n) at the radial length r is given by ##EQU1## where (n.sub.0) is the refractive index at the core axis, (a) is the core radius, .alpha. is a power exponent, n.sub.e is the refractive index of the cladding, and .DELTA.=(n.sub.0 -n.sub.e)/n.sub.0, said exponent .alpha. and the normalized frequency v (=(2.pi.an.sub.0 /.lambda.).sqroot.2.DELTA., .lambda. is the wavelength) are determined so that the group delay of the fundamental mode is equal to that of the first higher order mode. In particular, the value of .alpha. is determined in the range 3.2.ltoreq..alpha..ltoreq.6.0. Thus, the optical fiber with both a broad bandwidth and a large core diameter can be provided. A large core diameter optical fiber facilitates the connection or the splicing of two optical fibers.
    • 在径向长度为r的折射率分布(n)由给出的渐变折射率光纤中,其中(n0)是芯轴处的折射率,(a)是芯径,α是幂指数 ,ne是包层的折射率,并且DELTA =(n0-ne)/ n0,所述指数α和归一化频率v(=(2 pi an0 /λ)2ROOT 2 DELTA,λ是波长)被确定为 基本模式的组延迟等于第一个高阶模式的组延迟。 特别地,α的值在3.2≤3.0范围内确定。 因此,可以提供宽带宽和大直径的光纤。 大的芯径光纤有助于两根光纤的连接或拼接。