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A MEMS Variable Optical Attenuator with Ultra-Low Wavelength-Dependent Loss and Polarization-Dependent Loss
Huangqingbo Sun1, Wei Zhou2, Zijing Zhang3
1School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China. u201514056@hust.edu.cn.
Abstract:
Applications in broadband optical fiber communication system need variable optical attenuators (VOAs) with low wavelength-dependent loss (WDL). Based on analysis on the dispersion of the optical system of a MEMS-based VOA, we provide a method to reduce the WDL significantly with minor revision on the end-face angle of the collimating lens. Two samples are assembled, and the measured WDL is <0.4 dB over the C-band (1.53⁻1.57 μm) at a 0⁻20 dB attenuation range. Meanwhile, the new structure helps to reduce the polarization-dependent loss (PDL) to <0.15 dB, which is only half that of conventional devices.
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