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    • 64. 发明申请
    • Soi-based tunable laser
    • 基于Soi的可调谐激光器
    • US20090135861A1
    • 2009-05-28
    • US12291246
    • 2008-11-06
    • Mark WebsterDavid PiedePrakash Gothoskar
    • Mark WebsterDavid PiedePrakash Gothoskar
    • H01S3/10
    • H01S5/141H01S5/021H01S5/02248H01S5/02268H01S5/06256
    • A silicon-on-insulator (SOI)-based tunable laser is formed to include the gain medium (such as a semiconductor optical amplifier) disposed within a cavity formed within the SOI substrate. A tunable wavelength reflecting element and associated phase matching element are formed on the surface of the SOI structure, with optical waveguides formed in the surface SOI layer providing the communication between these components. The tunable wavelength element is controlled to adjust the optical wavelength. Separate discrete lensing elements may be disposed in the cavity with the gain medium, providing efficient coupling of the optical signal into the SOI waveguides. Alternatively, the gain medium itself may be formed to include spot converting tapers on its endfaces, the tapers used to provide mode matching into the associated optical waveguides.
    • 形成绝缘体上硅(SOI)的可调谐激光器以包括设置在形成于SOI衬底内的空腔内的增益介质(例如半导体光放大器)。 在SOI结构的表面上形成可调波长反射元件和相关的相位匹配元件,其中形成在表面SOI层中的光波导提供这些部件之间的连通。 可调波长元件被控制以调节光学波长。 单独的离散透镜元件可以用增益介质设置在空腔中,从而提供光信号到SOI波导的有效耦合。 或者,增益介质本身可以被形成为包括其端面上的点变换锥度,用于向相关联的光波导提供模式匹配的锥度。
    • 68. 发明授权
    • Low loss SOI/CMOS compatible silicon waveguide and method of making the same
    • 低损耗SOI / CMOS兼容硅波导及其制造方法
    • US07118682B2
    • 2006-10-10
    • US10806738
    • 2004-03-23
    • Vipulkumar Kantilal PatelPrakash GothoskarRobert Keith MontgomeryMargaret Ghiron
    • Vipulkumar Kantilal PatelPrakash GothoskarRobert Keith MontgomeryMargaret Ghiron
    • B29D11/00
    • G02F1/025
    • A method and structure for reducing optical signal loss in a silicon waveguide formed within a silicon-on-insulator (SOI) structure uses CMOS processing techniques to round the edges/corners of the silicon material along the extent of the waveguiding region. One exemplary set of processes utilizes an additional, sacrificial silicon layer that is subsequently etched to form silicon sidewall fillets along the optical waveguide, the fillets thus “rounding” the edges of the waveguide. Alternatively, the sacrificial silicon layer can be oxidized to consume a portion of the underlying silicon waveguide layer, also rounding the edges. Instead of using a sacrificial silicon layer, an oxidation-resistant layer may be patterned over a blanket silicon layer, the pattern defined to protect the optical waveguiding region. A thermal oxidation process is then used to convert the exposed portion of the silicon layer into silicon dioxide, forming a bird's beak structure at the edges of the silicon layer, thus defining the “rounded” edges of the silicon waveguiding structure.
    • 用于减少在绝缘体上硅(SOI)结构中形成的硅波导中的光信号损耗的方法和结构使用CMOS处理技术来沿着波导区域的范围舍入硅材料的边缘/角。 一个示例性的工艺集合利用附加的牺牲硅层,其随后被蚀刻以沿着光波导形成硅侧壁圆角,因此圆角“波浪”了波导的边缘。 或者,牺牲硅层可以被氧化以消耗下面的硅波导层的一部分,也是边缘的四周。 代替使用牺牲硅层,可以在覆盖硅层上图案化抗氧化层,所述图案被限定为保护光波导区域。 然后使用热氧化工艺将硅层的暴露部分转化成二氧化硅,在硅层的边缘处形成鸟的喙结构,从而限定硅波导结构的“圆形”边缘。
    • 69. 发明授权
    • Planar waveguide optical isolator in thin silicon-on-isolator (SOI) structure
    • 薄硅隔离器(SOI)结构中的平面波导光隔离器
    • US07113676B2
    • 2006-09-26
    • US11005286
    • 2004-12-06
    • David PiedeMargaret GhironPrakash GothoskarRobert Keith MontgomeryVipulkumar PatelKalpendu ShastriSoham PathakKatherine A. YanushefskiHarvey Wagner
    • David PiedeMargaret GhironPrakash GothoskarRobert Keith MontgomeryVipulkumar PatelKalpendu ShastriSoham PathakKatherine A. YanushefskiHarvey Wagner
    • G02B6/26G02B6/42
    • G02B6/1228G02B6/125G02B6/4207
    • A planar optical isolator is formed within the silicon surface layer of an SOI structure. A forward-directed signal is applied to an input waveguiding section of the isolator and thereafter propagates through a non-reciprocal waveguide coupling region into an output waveguide section. A rearward-directed signal enters via the output waveguide section and is thereafter coupled into the non-reciprocal waveguide structure, where the geometry of the structure functions to couple only a small amount of the reflected signal into the input waveguide section. In one embodiment, the non-reciprocal structure comprises an N-way directional coupler (with one output waveguide, one input waveguide and N−1 isolating waveguides). In another embodiment, the non-reciprocal structure comprises a waveguide expansion region including a tapered, mode-matching portion coupled to the output waveguide and an enlarged, non-mode matching portion coupled to the input waveguide such that a majority of a reflected signal will be mismatched with respect to the input waveguide section. By cascading a number of such planar SOI-based structures, increased isolation can be achieved—advantageously within a monolithic arrangement.
    • 在SOI结构的硅表面层内形成平面光隔离器。 正向信号被施加到隔离器的输入波导部分,然后通过非互易波导耦合区域传播到输出波导部分中。 后向信号经由输出波导部分进入,然后耦合到不可逆波导结构中,其中结构的几何结构仅将少量的反射信号耦合到输入波导部分中。 在一个实施例中,非互易结构包括N路定向耦合器(具有一个输出波导,一个输入波导和N-1个隔离波导)。 在另一个实施例中,不可逆结构包括波导扩展区域,其包括耦合到输出波导的锥形模式匹配部分和耦合到输入波导的放大的非模式匹配部分,使得反射信号的大部分将 相对于输入波导部分不匹配。 通过级联多个这种平面的基于SOI的结构,可以实现增加的隔离 - 有利地在单片布置中。