Title :
Bandwidth Estimation of External Electrooptic Modulators with Traveling-Wave Electrodes
Author :
Alam, M. Shah ; Sakawat Ali, M. ; Hassan, M. Khaled ; Haque, S. M Moynul ; Rahman, M. Azizur ; Uddin, M. Rakib
Author_Institution :
Dept. of Electr. & Electron. Eng., Bangladesh Univ. of Eng. & Technol., Dhaka
Abstract :
The bandwidth of traveling-wave electrooptic modulator on lithium niobate substrate is estimated by using the finite element method based on a quasi-TEM analysis. The microwave effective index, characteristic impedance, and loss are calculated. Optical frequency response is calculated and hence the bandwidth is estimated for velocity matching and impedance matching condition. Bandwidth increases significantly for simultaneous velocity and impedance matching but is limited by the microwave losses. It is shown that the asymmetry of coplanar waveguide in terms of the gap between the electrodes plays an important role on the highest value of the achievable optical bandwidth of the modulator
Keywords :
coplanar waveguides; electro-optical modulation; impedance matching; lithium compounds; microwave photonics; niobium compounds; transmission electron microscopy; bandwidth estimation; coplanar waveguide; external electrooptic modulators; finite element method; impedance matching; microwave effective index; microwave loss; optical bandwidth; optical frequency response; quasi-TEM analysis; traveling-wave electrodes; velocity matching; Bandwidth; Electrodes; Electrooptic modulators; Finite element methods; Frequency response; Impedance matching; Lithium niobate; Optical losses; Optical modulation; Optical waveguides;
Conference_Titel :
Electrical and Computer Engineering, 2006. ICECE '06. International Conference on
Conference_Location :
Dhaka
Print_ISBN :
98432-3814-1
DOI :
10.1109/ICECE.2006.355334
