公开(公告)号：US09817186B2

公开(公告)日：2017-11-14

申请号：US15122840

申请日：2015-03-04

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Shin Kamei ,  Makoto Jizodo ,  Hiroshi Fukuda ,  Kiyofumi Kikuchi

IPC分类号： G02B6/126 ,  G02B6/122 ,  G02B6/14 ,  G02B6/27 ,  G02B6/28 ,  G02B6/12

CPC分类号： G02B6/126 ,  G02B6/1228 ,  G02B6/14 ,  G02B6/2766 ,  G02B6/2861 ,  G02B2006/12061 ,  G02B2006/12097 ,  G02B2006/12147

摘要： Polarization rotators of conventional techniques require forming a silicon nitride layer, which is not employed in usual fabrication of a silicon waveguide circuit. In order to employ a polarization rotator function in an optical integrated circuit, a process of forming a silicon nitride layer is added just for that purpose. This increases the fabrication time and complicates the fabrication equipment. In a polarization rotator of the present invention, the waveguide width of a center core portion of a polarization converter is made small. Thus, the intensity of an optical wave does not concentrate only at the center core portion and is more influenced by structural asymmetry. With the configuration of the polarization rotator of the present invention, it is possible to efficiently cause polarization conversion with a structure including only a silicon waveguide and no silicon nitride layer or the like formed thereon.

公开(公告)号：US09128348B1

公开(公告)日：2015-09-08

申请号：US14418386

申请日：2013-09-26

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Hiroshi Yamazaki ,  Hiroshi Takahashi ,  Takashi Goh ,  Takashi Saida ,  Kiyofumi Kikuchi

IPC分类号： G02F1/035 ,  G02F1/225 ,  G02F1/21

CPC分类号： G02F1/225 ,  G02F1/0123 ,  G02F1/035 ,  G02F1/2255 ,  G02F1/2257 ,  G02F2001/212 ,  G02F2201/126 ,  G02F2201/16 ,  G02F2203/19 ,  H04B10/5051 ,  H04B10/588

摘要： An optical modulation circuit includes: a first Mach-Zehnder modulating portion including a first output port and a second output port, wherein the first Mach-Zehnder modulating portion is push-pull driven by a main signal; a second Mach-Zehnder modulating portion connected to the first output port of the first Mach-Zehnder modulating portion, wherein the second Mach-Zehnder modulating portion is push-pull driven by a correction signal; and an asymmetric light combining portion combining an optical signal outputted from an output port of the second Mach-Zehnder modulating portion with an optical signal outputted from the second output port of the first Mach-Zehnder modulating portion in a light intensity coupling ratio of r to 1−r, wherein an optical path length from the first output port to the asymmetric light combining portion is substantially equal to an optical path length from the second output port to the asymmetric light combining portion.

摘要翻译： 光调制电路包括：第一马赫 - 曾德调制部分，包括第一输出端口和第二输出端口，其中第一马赫 - 策德尔调制部分由主信号驱动; 第二马赫 - 策德尔调制部分，连接到第一马赫 - 策德尔调制部分的第一输出端口，其中第二马赫 - 策德尔调制部分由校正信号驱动; 以及非对称光合成部，其将从所述第二马赫 - 策德尔调制部的输出端口输出的光信号与从所述第一马赫 - 策德尔调制部的所述第二输出端口输出的光信号的光强度耦合比率r 1-r，其中从第一输出端口到非对称光合成部分的光路长度基本上等于从第二输出端口到非对称光合并部分的光路长度。