近年來，使用光學系統，尤其是集成電路 (IC) 的數字通信設備的增長已成為主要關注點。為了在光子電路芯片中創建快速、寬帶和可調諧的光開關，研究了“絕熱耦合器的寬帶無源元件”和“有源窄帶EOPMC”的集成。使用 Ti 中 TE 和 TM 偏振基模絕熱光傳輸的寬帶偏振分束器：在擴散 (LiNbO3) 波導和基於 Ti:PPLN 波導的窄帶但可調諧的有源電光偏振模式轉換將導致單芯片上的可調諧寬帶有源模式偏振模式開關。 在這項研究中，寬帶可調諧 EO 開關器件在 50 毫米長、20 毫米寬和 0.5 毫米厚的 z 切割 LiNbO3 芯片中使用熱擴散法和電場極化技術製造，23 ?m 光柵週期。 AAC 部分設計為與波長無關且高偏振消光比 (PER) 偏振分束器 (PBS)，當沿晶體學施加外部電場時，EOPMC 可以在 TE 和 TM 偏振模式之間轉換Ti:PPLN 在 EO 係數 r51 處的 y 軸。我們的目標是通過主動調諧任一偏振的輸入偏振波來實現寬帶偏振模式切換，以便由於絕熱耦合器的高耦合效率而確定輸出偏振波。該實驗也在較寬的溫度和波長下進行。 有源開關的測量結果與仿真過程具有良好的擬合效果。轉換效率/耦合效率也可高達 96%，帶寬約為 2.7 nm，接近無源開關的結果 (98%)。這種獨特的器件可在 20 V 的低驅動電壓下工作，並且還顯示出寬溫度範圍，在 TE 和 TM 偏振的寬波長范圍內具有調諧速率 dλ/ dT = -1 nm ;In recent years, the growth of digital communications devices using optical systems, especially with Integrated Circuits (IC), has become the main interest. To create fast, broadband, and tunable optical switch in a photonic circuit chip, the research to integrate the “broadband passive elements of Adiabatic Coupler” and the “active narrowband EOPMC” has been studied. Using the broadband polarization beam splitter of the adiabatic light transfer of TE- and TM-polarized fundamental modes in Ti: In diffused (LiNbO3) waveguides and narrowband but tunable active electro-optical polarization mode conversion based on a Ti:PPLN waveguide will lead to tunable broadband active mode polarization mode switch on a single chip. In this study, the broadband tunable EO switch device is fabricated in a 50-mm long, 20-mm wide, and 0.5-mm thick z-cut LiNbO3 chip using the thermal in: diffusion method and electric-field poling technique with a 23 ?m grating period. The AAC part is designed to work as a wavelength-independent and high polarization-extinction-ratio (PER) polarization beam splitter (PBS), then EOPMC could convert between TE and TM-Polarized modes when an external electric field is applied along the crystallographic y-axis of the Ti:PPLN at EO coefficient r51. Our goal is to achieve the broadband polarization mode switches by actively tuning the input polarization wave for either polarization so that the output polarization wave could be determined as a result of the high coupling efficiency of adiabatic couplers. The experiment also has been done in broad temperature and wavelength. The measurement result of the active switch had a good-fitting result with the simulation process. The conversion efficiency/coupling efficiency also can reach as high as 96% with ~2.7 nm bandwidth which is close to the passive switch’s result (98%). This unique device works at a low driving voltage of 20 V and also shown a broad temperature range with tuning rate dλ/ dT = -1 nm over broad wavelength for both TE and TM polarization.
