公开(公告)号：WO2013184899A1

公开(公告)日：2013-12-12

申请号：PCT/US2013044486

申请日：2013-06-07

Applicant: EOSPACE INC

Inventor： THANIYAVARN SUWAT

IPC: G02B6/10 ,  G02B6/00

CPC classification number: G02F1/225 ,  G02F1/0316 ,  G02F1/0356 ,  G02F1/2255 ,  G02F2001/212 ,  G02F2201/127

Abstract: Improved optical interferometric modulators have a small waveguide spacing so that the waveguide pair are close to the central electrode, to enhance electro-optic interaction. Asymmetric waveguides with differential indices are used to effectively de-couple the waveguide pair. Multiple sections of asymmetric waveguide pairs with alternating differential indices are used to achieve chirp-free operation. Another version of the device utilizes transmission-line electrode that weave closer to one of the waveguide pair alternately between sections. Another version of the device utilizes waveguide structure that one of the waveguide is closer to the central electrode in alternate section. To improve efficiency further, a DC bias is provided on the outer electrodes configured as an RF-ground but DC-float electrodes. Another improvement is to have a slot is cut underneath the waveguide region to effectively reduce to thickness of the substrate. These improvements lead to higher modulator efficiency.

Abstract translation: 改进的光学干涉式调制器具有小的波导间隔，使得波导对靠近中心电极，以增强电光相互作用。 使用具有差分指数的非对称波导来有效地去耦合波导对。 使用具有交替差分指数的不对称波导对的多个部分来实现无啁啾操作。 该器件的另一个版本利用传输线电极，它们在部分之间交替地编织在波导对中的一个上。 该器件的另一个版本使用波导结构，其中一个波导在交替部分更靠近中心电极。 为了进一步提高效率，在被配置为RF接地但DC浮子电极的外部电极上提供DC偏压。 另一个改进是在波导区域下面切割槽以有效地减小到衬底的厚度。 这些改进导致更高的调制器效率。

公开(公告)号：WO2013184899A8

公开(公告)日：2013-12-12

申请号：PCT/US2013/044486

申请日：2013-06-07

Applicant: EOSPACE INC.

Inventor： THANIYAVARN, Suwat

IPC: G02B6/10 ,  G02B6/00

Abstract: Improved optical interferometric modulators have a small waveguide spacing so that the waveguide pair are close to the central electrode, to enhance electro-optic interaction. Asymmetric waveguides with differential indices are used to effectively de-couple the waveguide pair. Multiple sections of asymmetric waveguide pairs with alternating differential indices are used to achieve chirp-free operation. Another version of the device utilizes transmission-line electrode that weave closer to one of the waveguide pair alternately between sections. Another version of the device utilizes waveguide structure that one of the waveguide is closer to the central electrode in alternate section. To improve efficiency further, a DC bias is provided on the outer electrodes configured as an RF-ground but DC-float electrodes. Another improvement is to have a slot is cut underneath the waveguide region to effectively reduce to thickness of the substrate. These improvements lead to higher modulator efficiency.

公开(公告)号：WO2008024183A3

公开(公告)日：2008-06-19

申请号：PCT/US2007017159

申请日：2007-08-01

Applicant: EOSPACE INC ,  THANIYAVARN SUWAT

Inventor： THANIYAVARN SUWAT

IPC: H04B10/00 ,  G02F1/01 ,  G02F1/035 ,  H04B10/04 ,  H04B10/12

CPC classification number: H04B10/2587 ,  H04B10/25758 ,  H04B10/58

Abstract: A cw-laser source transmits low-noise, narrow-linewidth optical power via an optical fiber (17) to a bias-free electro-optic phase modulator (21) at a remote site (19), where an antenna or an RF sensor (23) is located. The RF electrical signal modulates the phase modulator at the remote site, converting an electrical signal into an optical signal. The phase-modulated optical signal is fed back via the optical fiber to an optical filter (29) whose filter transfer characteristics can be tuned and reconfigured to cancel the intermodulation distortion terms, particularly the dominant 3rd order intermodulation, as well as the 2nd order. The filtered optical signal is converted to the RF signal at the photodetector (35). The optical filter is used to effectively "linearize" the signal at the receiver end, rather than at the modulator end.

Abstract translation: cw激光源通过光纤（17）将低噪声，窄线宽光功率传输到远程位置（19）处的无偏置电光相位调制器（21），其中天线或RF传感器 （23）。 RF电信号调制远端的相位调制器，将电信号转换为光信号。 相位调制的光信号通过光纤被反馈到滤光器（29），滤光器滤波器（29）可以调整滤波器传输特性并进行重新配置，以消除互调失真项，特别是主要的三阶互调，以及二阶。 滤波后的光信号在光电检测器（35）处被转换成RF信号。 光滤波器用于在接收端有效地“线性化”信号，而不是在调制器端。

公开(公告)号：WO2017086903A1

公开(公告)日：2017-05-26

申请号：PCT/US2015/057990

申请日：2015-11-16

Applicant: EOSPACE INC.

Inventor： THANIYAVARN, Suwat

IPC: H04B10/2575 ,  H04B10/67

CPC classification number: H04B10/25752 ,  H04B10/25758 ,  H04B10/675

Abstract: Wide band phase modulators used with high power laser carriers convert high-frequency RF signals to phase-modulated optical signals. Higher laser optical power to the modulator produces larger RF signal sidebands. A carrier attenuation filter passes the attenuated carrier and non- attenuated RF modulation sidebands. Carrier attenuation leaves the larger RF signal sidebands. A demodulation filter used with a photodetector or a balanced photodetector pair converts the phase-modulated optical signal back to an electrical signal. Carrier-only attenuation allows high power laser use, avoids photodetector damage or saturation, and provides increased RF link gain, low noise figure (NF) and high spurious-free dynamic range (SFDR). Filtered-out carrier power fed back to the laser source increases to overall system efficiency. An additional optical delay filter with dual outputs used with a polarization multiplexer or a coherent combiner coupler combines signal power to a single photodetector to further increase electro-optic signal conversion efficiency.

Abstract translation: 与高功率激光载波一起使用的宽带相位调制器将高频RF信号转换为相位调制的光信号。 调制器的较高激光光功率产生较大的RF信号边带。 载波衰减滤波器通过衰减载波和非衰减RF调制边带。 载波衰减留下更大的RF信号边带。 与光电探测器或平衡光电探测器对一起使用的解调滤波器将相位调制的光信号转换回电信号。 仅载波衰减允许使用高功率激光器，避免光电探测器损坏或饱和，并提供更高的RF链路增益，低噪声系数（NF）和高无杂散动态范围（SFDR）。 滤波后的载波功率反馈到激光源增加到整体系统效率。 具有双输出的偏振复用器或相干合成器耦合器的附加光学延迟滤波器将信号功率合并到单个光电检测器，以进一步提高电光信号转换效率。

公开(公告)号：WO2008024183A2

公开(公告)日：2008-02-28

申请号：PCT/US2007/017159

申请日：2007-08-01

Applicant: EOSPACE, INC. ,  THANIYAVARN, Suwat

Inventor： THANIYAVARN, Suwat

IPC: H04B10/04

CPC classification number: H04B10/2587 ,  H04B10/25758 ,  H04B10/58

Abstract: A cw-laser source transmits low-noise, narrow-linewidth optical power via an optical fiber to a bias-free electro-optic phase modulator at a remote site, where an antenna or an RF sensor is located. The RF electrical signal modulates the phase modulator at the remote site, converting an electrical signal into an optical signal. The phase-modulated optical signal is fed back via the optical fiber to an optical filter whose filter transfer characteristics can be tuned and reconfigured to cancel the intermodulation distortion terms, particularly the dominant 3 rd order intermodulation, as well as the 2 nd order. The filtered optical signal is converted to the RF signal at the photodetector. The optical filter is used to effectively "linearize" the signal at the receiver end, rather than at the modulator end.

Abstract translation: cw激光源通过光纤将低噪声，窄线宽光功率传输到位于天线或RF传感器的远程位置处的无偏置电光相位调制器。 RF电信号在远程站点调制相位调制器，将电信号转换为光信号。 相位调制的光信号通过光纤被反馈到滤波器，滤光器的滤波器传送特性可以被调谐和重构，以消除互调失真项，特别是主要的第三阶互调 作为2 ^{nd 顺序。 滤波后的光信号在光检测器处被转换成RF信号。 光滤波器用于在接收端而不是在调制器端有效地“线性化”信号。}