公开(公告)号：US07553092B2

公开(公告)日：2009-06-30

申请号：US11450743

申请日：2006-06-08

Applicant: Kwang Seong Choi ,  Yong Duck Chung ,  Young Shik Kang ,  Dong Suk Jun ,  Je Ha Kim ,  Jong Tae Moon

Inventor： Kwang Seong Choi ,  Yong Duck Chung ,  Young Shik Kang ,  Dong Suk Jun ,  Je Ha Kim ,  Jong Tae Moon

IPC: G02B6/36

CPC classification number: G02F1/0121 ,  G02B6/4201 ,  G02B6/4279 ,  H01L2224/48091 ,  H01L2924/3011 ,  H01L2924/00014 ,  H01L2924/00

Abstract: Provided is an optical module used in a communication system employing a radio over fiber (ROF) technology delivering a radio frequency (RF) signal through an optical fiber. The optical module includes: an optical device; a signal line for transporting a radio frequency (RF) signal input from an external circuit to the optical device; and a resistor separately disposed from the signal line and having one end connected with the optical device, wherein the input impedance seen from the signal line is matched by the resistor. A bias voltage supplied to operate the optical device is applied through an inductor connected to the signal line between the optical device and a filter. Here, the filter formed by a pattern of the signal line prevents the bias voltage from being supplied to the external circuit. In order to amplify the RF signal input from the external circuit, an amplifier may be connected between the external circuit and the filter.

Abstract translation: 提供了一种用于通过光纤传送射频（RF）信号的无线电光纤（ROF）技术的通信系统中的光学模块。 光学模块包括：光学装置; 用于将从外部电路输入的射频（RF）信号传送到光学装置的信号线; 以及与信号线分开设置并且具有与光学装置连接的一端的电阻，其中从信号线看到的输入阻抗由电阻器匹配。 提供用于操作光学器件的偏置电压通过连接到光学器件和滤光器之间的信号线的电感器施加。 这里，由信号线的图案形成的滤波器防止偏置电压被提供给外部电路。 为了放大从外部电路输入的RF信号，可以在外部电路和滤波器之间连接放大器。

公开(公告)号：US07583869B2

公开(公告)日：2009-09-01

申请号：US11451743

申请日：2006-06-13

Applicant: Young Shik Kang ,  Je Ha Kim ,  Sung Bock Kim ,  Yong Duck Chung ,  Kwang Seong Choi

Inventor： Young Shik Kang ,  Je Ha Kim ,  Sung Bock Kim ,  Yong Duck Chung ,  Kwang Seong Choi

IPC: G02B6/12

CPC classification number: H01S5/026 ,  H01S5/0262 ,  H01S5/0265 ,  H01S5/1014 ,  H01S5/22 ,  H01S5/50

Abstract: An electroabsorption (EA) duplexer in which an optical amplifier, a photodetector, and an optical modulator are monolithically integrated to obtain a high radio frequency (RF) gain in radio-over fiber (RoF) link optical transmission technology is provided. The EA duplexer includes a substrate, a separation area, an optical detection/modulation unit, and an optical amplification unit. The separation area includes a first epitaxial layer formed of at least one material layer on the substrate. The first epitaxial layer functions as a first optical waveguide. The optical detection/modulation unit includes a second epitaxial layer formed of at least one material layer on the first epitaxial layer to detect and modulate an optical signal. The second epitaxial layer functions as a second optical waveguide. The optical amplification unit includes the second optical waveguide and a third epitaxial layer formed of at least one material layer on the second epitaxial layer to amplify an optical signal. The third epitaxial layer functions as a third optical waveguide. The optical amplification unit is electrically separated from the optical detection/modulation unit by the separation area and is disposed on at least one side of the optical detection/modulation unit.

Abstract translation: 提供了其中光放大器，光电检测器和光调制器被单片集成以获得无线电光纤（RoF）链路光传输技术中的高射频（RF）增益的电吸收（EA）双工器。 EA双工器包括基板，分离区，光检测/调制单元和光放大单元。 分离区域包括由衬底上的至少一个材料层形成的第一外延层。 第一外延层用作第一光波导。 光检测/调制单元包括由第一外延层上的至少一个材料层形成的第二外延层，以检测和调制光信号。 第二外延层用作第二光波导。 光放大单元包括第二光波导和由第二外延层上的至少一个材料层形成的第三外延层，以放大光信号。 第三外延层用作第三光波导。 光放大单元通过分离区域与光检测/调制单元电分离，并设置在光检测/调制单元的至少一侧。

公开(公告)号：US07359588B2

公开(公告)日：2008-04-15

申请号：US11302538

申请日：2005-12-14

Applicant: Young Shik Kang ,  Jeha Kim ,  Yong Hwan Kwon ,  Yong Duck Chung

Inventor： Young Shik Kang ,  Jeha Kim ,  Yong Hwan Kwon ,  Yong Duck Chung

IPC: G02B6/12 ,  H01L21/00

CPC classification number: G02F1/01708 ,  B82Y20/00 ,  G02B6/1228 ,  G02B6/136

Abstract: Provided is a double waveguide electroabsorption modulator, in which two spot size converters are integrated between first and second optical waveguides, thereby reducing an insertion loss between an optical fiber and an optical modulator while favorably operating even in high input optical power. Therefore, the electroabsorption modulator can stably operate in higher input optical power while reducing an optical coupling loss and an optical confinement factor (OCF).

Abstract translation: 提供了一种双波导电吸收调制器，其中两个光斑尺寸转换器集成在第一和第二光波导之间，由此即使在高输入光功率的同时也有利于光纤和光调制器之间的插入损耗。 因此，电吸收调制器可以在降低光耦合损耗和光限制因子（OCF）的同时，以更高的输入光功率稳定地工作。

公开(公告)号：US07298933B2

公开(公告)日：2007-11-20

申请号：US11148906

申请日：2005-06-09

Applicant: Kwang Seong Choi ,  Jong Hyun Lee ,  Yong Duck Chung ,  Young Shik Kang ,  Jong Tae Moon ,  Je Ha Kim

Inventor： Kwang Seong Choi ,  Jong Hyun Lee ,  Yong Duck Chung ,  Young Shik Kang ,  Jong Tae Moon ,  Je Ha Kim

IPC: G02F1/01 ,  G02F1/35

CPC classification number: G02F1/0356

Abstract: Provided is an optical module including a microstrip line, a traveling wave type optical device positioned in the end of the microstrip line, and at least one balanced open stub connected to the microstrip line for the impedance matching at a specific frequency such as 40 GHz and 60 GHz. For the fine tuning, laser trimming can be applied to the stub. A transition region is formed between the optical device and the microstrip line. A termination resistor is formed to face the microstrip line with the optical device therebetween. A bandwidth can be controlled at a specific frequency by adjusting a number of the stubs or a value of the termination resistor.

Abstract translation: 提供了一种光学模块，其包括微带线，位于微带线的端部的行波型光学器件和连接到微带线的至少一个平衡的开路短路，用于在特定频率例如40GHz的阻抗匹配，以及 60 GHz。 对于微调，激光修剪可以应用于存根。 在光学器件和微带线之间形成过渡区域。 形成终端电阻器，以便在其间具有光学器件来面对微带线。 可以通过调整短路的数量或终端电阻的值来控制带宽在特定频率。

公开(公告)号：US06985273B2

公开(公告)日：2006-01-10

申请号：US10743463

申请日：2003-12-23

Applicant: Young Shik Kang ,  Je Ha Kim ,  Ji Youn Lim ,  Sung Bock Kim

Inventor： Young Shik Kang ,  Je Ha Kim ,  Ji Youn Lim ,  Sung Bock Kim

IPC: G02F

CPC classification number: B82Y20/00 ,  G02F1/01708 ,  G02F2001/0175

Abstract: Disclosed is an electro-absorption optical modulator using a semiconductor device. The optical modulator makes use of a change in light absorption caused by displacement of an absorption curve depending on a bias voltage applied to the device. Here, a level of the light absorption depending on the bias voltage is expressed as a transfer function of output light to the applied bias, and the transfer function has a non-linear profile due to a characteristic of a material. Unlike signal modulation of a digital optical communication system, an analog optical transmission system can be subjected to deterioration in performance, because the non-linear characteristic of the transfer function for the optical modulator generates signal distortion when an electrical signal is converted into an optical signal. The typical optical modulator has an absorption layer constituted of quantum wells having the same width. However, the inventive optical modulator has the absorption layer formed by the combination of quantum wells having a width different form each other, thus having excellent linearity.

Abstract translation: 公开了使用半导体器件的电吸收光调制器。 光调制器利用由施加到器件的偏置电压引起的吸收曲线位移引起的光吸收变化。 这里，根据偏置电压的光吸收水平被表示为输出光到施加偏压的传递函数，并且传递函数由于材料的特性而具有非线性轮廓。 与数字光通信系统的信号调制不同，模拟光传输系统由于光调制器的传递函数的非线性特性在将电信号转换成光信号时会产生信号失真 。 典型的光调制器具有由具有相同宽度的量子阱构成的吸收层。 然而，本发明的光调制器具有通过量子阱的组合形成的吸收层，该量子阱具有彼此不同的宽度，因此具有优异的线性。

公开(公告)号：US20070171515A1

公开(公告)日：2007-07-26

申请号：US11451743

申请日：2006-06-13

Applicant: Young Shik Kang ,  Je Ha Kim ,  Sung Bock Kim ,  Yong Duck Chung ,  Kwang Seong Choi

Inventor： Young Shik Kang ,  Je Ha Kim ,  Sung Bock Kim ,  Yong Duck Chung ,  Kwang Seong Choi

IPC: H01S3/00 ,  G02B6/10

CPC classification number: H01S5/026 ,  H01S5/0262 ,  H01S5/0265 ,  H01S5/1014 ,  H01S5/22 ,  H01S5/50

Abstract: An electroabsorption (EA) duplexer in which an optical amplifier, a photodetector, and an optical modulator are monolithically integrated to obtain a high radio frequency (RF) gain in radio-over fiber (RoF) link optical transmission technology is provided. The EA duplexer includes a substrate, a separation area, an optical detection/modulation unit, and an optical amplification unit. The separation area includes a first epitaxial layer formed of at least one material layer on the substrate. The first epitaxial layer functions as a first optical waveguide. The optical detection/modulation unit includes a second epitaxial layer formed of at least one material layer on the first epitaxial layer to detect and modulate an optical signal. The second epitaxial layer functions as a second optical waveguide. The optical amplification unit includes the second optical waveguide and a third epitaxial layer formed of at least one material layer on the second epitaxial layer to amplify an optical signal. The third epitaxial layer functions as a third optical waveguide. The optical amplification unit is electrically separated from the optical detection/modulation unit by the separation area and is disposed on at least one side of the optical detection/modulation unit.

Abstract translation: 提供了其中光放大器，光电检测器和光调制器被单片集成以获得无线电光纤（RoF）链路光传输技术中的高射频（RF）增益的电吸收（EA）双工器。 EA双工器包括基板，分离区，光检测/调制单元和光放大单元。 分离区域包括由衬底上的至少一个材料层形成的第一外延层。 第一外延层用作第一光波导。 光检测/调制单元包括由第一外延层上的至少一个材料层形成的第二外延层，以检测和调制光信号。 第二外延层用作第二光波导。 光放大单元包括第二光波导和由第二外延层上的至少一个材料层形成的第三外延层，以放大光信号。 第三外延层用作第三光波导。 光放大单元通过分离区域与光检测/调制单元电分离，并设置在光检测/调制单元的至少一侧。