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    • 4. 发明申请
    • Semiconductor Optical Device and Manufacturing Method Thereof
    • 半导体光学器件及其制造方法
    • US20080219315A1
    • 2008-09-11
    • US11838256
    • 2007-08-14
    • SHIGEKI MAKINOKazunori ShinodaTakeshi Kitatani
    • SHIGEKI MAKINOKazunori ShinodaTakeshi Kitatani
    • H01S5/00G02B6/10H01L21/00
    • H01S5/0265B82Y20/00H01L2224/48091H01S5/02276H01S5/02284H01S5/026H01S5/0425H01S5/06256H01S5/101H01S5/12H01S5/227H01S5/34306H01L2924/00014
    • A low reflective window structure in an existent electro-absorption optical modulator involves a trading off problem between the increase in the parasitic capacitance and the pile-up. This is because the capacitance density of the pn junction in the window structure is higher compared with the pin junction as the optical absorption region, and the application of electric field to the optical absorption region becomes insufficient in a case of receding the electrode structure from the junction between the optical absorption region and the window structure making it difficult to discharge photo-carriers generated in the optical absorption region. An undope waveguide structure comprising a structure having such compositional wavelength and a film thickness that the compositional wavelength for each of multi-layers constituting the waveguide structure is sufficiently shorter than that of the signal light and the average refractive index is about identical with that in the optical absorption region may be disposed. In a case of forming the electrode structure so as to overlap the junction boundary between the optical absorption region and the undope waveguide, and do not extend on the joined boundary between the undope waveguide and the window structure, increase in the parasitic capacitance due to the pn junction of the window structure and pile up can be suppressed simultaneously.
    • 存在的电吸收光调制器中的低反射窗结构涉及寄生电容增加和堆积之间的折衷问题。 这是因为窗口结构中的pn结的电容密度与作为光吸收区的pin结相比较高,并且在电极结构从光吸收区退出的情况下,对光吸收区的电场的施加变得不足 光吸收区域和窗口结构之间的结,使得难以放电在光吸收区域中产生的光载流子。 包括具有这种组成波长和膜厚的结构的未掺杂波导结构,构成波导结构的多层的组成波长比信号光的平均折射率充分短,并且平均折射率大致相同 可以设置光吸收区域。 在形成电极结构以与光吸收区域和未反射波导之间的接合边界重叠的情况下,并且不延伸在未波导波导和窗口结构之间的接合边界上时,寄生电容由于 pn结的窗结构和堆积可以同时抑制。
    • 6. 发明授权
    • Semiconductor optical device and manufacturing method thereof
    • 半导体光学器件及其制造方法
    • US07577319B2
    • 2009-08-18
    • US11838256
    • 2007-08-14
    • Shigeki MakinoKazunori ShinodaTakeshi Kitatani
    • Shigeki MakinoKazunori ShinodaTakeshi Kitatani
    • G02F1/035H01L21/00
    • H01S5/0265B82Y20/00H01L2224/48091H01S5/02276H01S5/02284H01S5/026H01S5/0425H01S5/06256H01S5/101H01S5/12H01S5/227H01S5/34306H01L2924/00014
    • A low reflective window structure in an existent electro-absorption optical modulator involves a trading off problem between the increase in the parasitic capacitance and the pile-up. This is because the capacitance density of the pn junction in the window structure is higher compared with the pin junction as the optical absorption region, and the application of electric field to the optical absorption region becomes insufficient in a case of receding the electrode structure from the junction between the optical absorption region and the window structure making it difficult to discharge photo-carriers generated in the optical absorption region. An undope waveguide structure comprising a structure having such compositional wavelength and a film thickness that the compositional wavelength for each of multi-layers constituting the waveguide structure is sufficiently shorter than that of the signal light and the average refractive index is about identical with that in the optical absorption region may be disposed. In a case of forming the electrode structure so as to overlap the junction boundary between the optical absorption region and the undope waveguide, and do not extend on the joined boundary between the undope waveguide and the window structure, increase in the parasitic capacitance due to the pn junction of the window structure and pile up can be suppressed simultaneously.
    • 存在的电吸收光调制器中的低反射窗结构涉及寄生电容增加和堆积之间的折衷问题。 这是因为窗口结构中的pn结的电容密度与作为光吸收区的pin结相比较高,并且在电极结构从光吸收区退出的情况下,对光吸收区的电场的施加变得不足 光吸收区域和窗口结构之间的结,使得难以放电在光吸收区域中产生的光载流子。 包括具有这种组成波长和膜厚的结构的未掺杂波导结构,构成波导结构的多层的组成波长比信号光的平均折射率充分短,并且平均折射率大致相同 可以设置光吸收区域。 在形成电极结构以与光吸收区域和未反射波导之间的接合边界重叠的情况下,并且不延伸在未波导波导和窗口结构之间的接合边界上时,寄生电容由于 pn结的窗结构和堆积可以同时抑制。