Related Experiment Video
Updated: Feb 21, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
Design of a high-efficiency U-shape MOS capacitor Michelson interferometer modulator
Abstract:
This work presents a high-efficiency, single-drive U-shape MOS capacitor Michelson interferometer modulator. The introduced U-shape structure enables vertical compression of the optical mode, which significantly enhances the modulation efficiency without compromising series resistance or loaded capacitance. Furthermore, by adopting a Michelson interferometer configuration, the device doubles the effective modulation length through bidirectional light propagation, while maintaining an unchanged capacitance. The designed device achieves a high modulation efficiency of 1.08 V·mm and achieves 50 Gbaud/s operation with an extinction ratio about 2.3 dB under a low 2 Vpp drive voltage. The proposed U-shape MOS capacitor modulator reduces reliance on external driver circuits in OIO and CPO transmitters, offering a promising solution for energy-efficient and compact electro-optic modulators.
Related Concept Videos
Design Example: Capacitance Multiplier Circuit
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
MOS Capacitor
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
MOSFET Amplifiers
MOSFET: Enhancement Mode
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...

