The Intergraded Electromagnetic Field Sensor Combining a Micro Antenna with a LiNbO3 Mach-Zehnder Waveguide Modulator

• Main Authors: Po-I Wu, 吳柏毅
• Other Authors: Ching-Ting Lee
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/82836834360565881625

碩士 === 國立成功大學 === 光電科學與工程研究所 === 94 === The amplitude modulator of an electromagnetic field sensor using Ti diffusion process on Z-cut LiNbO3 and optical fiber link is improved by a Mach-Zehnder interferometer, whose Vπ is about 10V at 1550nm wavelength and the on-off extinction ratio is 23.8dB. In this thesis, the plane antenna was directly applied to suppress the volume and strengthen the connection between each part of the device for the purpose of optoelectronic intergraded circuit. After being ground and polished well, the device was coupled with fiber directly. Then the characteristic of the fabricated sensor were analyzed. It was found that the resulting frequency response is almost flat from 100MHz to 1.8GHz, and the resonant frequency is at 2GHz. The minimum detectable electric field strengths are 2.85×10-3V/m at 100MHz and 8.91×10-4V/m at 2GHz. Therefore, the optical electric field sensor made by LiNbO3 could become more valuable in application.