公开(公告)号：AU6168101A

公开(公告)日：2001-11-26

申请号：AU6168101

申请日：2001-05-17

Applicant: EOSPACE INC

Inventor： THANIYAVARN SUWAT

IPC: G02F1/313 ,  G02B6/26 ,  G02B6/10 ,  G02F1/035

Abstract: Optical switches based on the balanced bridge interferometer design require precisely made (or half a coupling length) directional couplers to achieve minimum crosstalk for the two switch outputs. Precision 3 dB-directional couplers require the waveguide dimensions and fabrication parameters of the evanescent region to be tightly controlled making a low crosstalk switch difficult to manufacture and expensive. A new type of balanced bridge interferometer type switch is disclosed where the input and output directional couplers are asymmetrically biased to induce a certain difference in the propagation constants between the two waveguide in the directional couplers. By using the asymmetrically biased directional couplers with a certain tuning a bias voltage for the directional couplers. Low crosstalk switches can be achieved for a very wide range of directional coupler strengths, relaxing the precise half-coupling length directional couplers required in conventional design. This relaxation of the precise directional coupler waveguide regions allows a relaxation in the manufacturing tolerance of the devices and therefore make the switch much easier to make. Because low crosstalk switches can be a device with an extended operating range and broader directional coupler parameters, switches can be used for a much broader wavelength bandwidth. In one of the embodiments, this new design allows a device to switch both TE and TM mode optical signals simultaneously at low crosstalk levels to result in a polarization-independent optical switch.

公开(公告)号：DE112013000181T5

公开(公告)日：2015-04-02

申请号：DE112013000181

申请日：2013-06-07

Applicant: EOSPACE INC

Inventor： THANIYAVARN SUWAT

IPC: G02B6/10 ,  G02B6/00

Abstract: Verbesserte optische interferometrische Modulatoren weisen eine kleine Wellenleiterbeabstandung auf, sodass das Wellenleiterpaar nahe an der zentralen Elektrode liegt, um elektrooptische Interaktion zu steigern. Es sind asymmetrische Wellenleiter mit unterschiedlichen Indizes zum effektiven Entkoppeln des Wellenleiterpaars benutzt. Es sind mehrfache Teilabschnitte von asymmetrischen Wellenleitern mit abwechselnden unterschiedlichen Indizes benutzt, um chirpfreien Betrieb zu erzielen. Eine andere Version der Vorrichtung nutzt Übertragungsleitungselektroden, die sich abwechselnd zwischen Teilabschnitten näher an eines des Wellenleiterpaars schlängeln. Eine andere Version der Vorrichtung nutzt eine Wellenleiterstruktur, bei der einer der Wellenleiter in abwechselndem Teilabschnitt näher an der zentralen Elektrode liegt. Zum weiteren Verbessern der Effizienz ist eine GS-Vorspannung an den äußeren Elektroden vorgesehen, die als HF-Masse-, jedoch GS-Float-Elektroden konfiguriert sind. Eine weitere Verbesserung ist, dass ein Schlitz unterhalb des Wellenleiterbereichs eingeschnitten ist, um die Stärke des Substrats effektiv zu reduzieren. Diese Verbesserungen führen zu höherer Modulatoreffizienz.

公开(公告)号：DE112007001955T5

公开(公告)日：2009-07-02

申请号：DE112007001955

申请日：2007-08-01

Applicant: EOSPACE INC

Inventor： THANIYAVARN SUWAT

IPC: H04B10/04

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 3rd order intermodulation, as well as the 2nd 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.

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：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。