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Xiaoguang Tu, Ka-Fai Chang, Tsung-Yang Liow

|October 17, 2014

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This study demonstrates a silicon Mach-Zehnder Interferometer (MZI) optical modulator using a novel shield coplanar waveguide (CPW) electrode design. This innovation significantly enhances electro-optical (EO) bandwidth and reduces signal distortion for high-speed data transmission.

Area of Science:

Photonics
Electrical Engineering
Materials Science

Background:

Silicon Mach-Zehnder Interferometer (MZI) optical modulators are crucial for high-speed optical communication.
Parasitic slot-line (SL) modes in electrode designs can cause signal distortion and limit bandwidth.
Improving electrical and electro-optical (EO) bandwidth is essential for next-generation data rates.

Purpose of the Study:

To demonstrate a silicon MZI optical modulator with a shield coplanar waveguide (CPW) transmission line electrode design.
To suppress signal distortion caused by parasitic SL modes.
To enhance the electrical and EO bandwidth of the MZI modulator.

Main Methods:

Fabrication of a silicon MZI optical modulator incorporating shield-CPW electrodes.

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Characterization of the modulator's performance, including EO bandwidth and V(π).

Testing the modulator at a 28-Gb/s data rate to evaluate extinction ratio and power consumption.

Main Results:

The demonstrated silicon MZI optical modulator achieved an EO bandwidth exceeding 24 GHz.
A V(π) of 3.0 V was obtained at a wavelength of 1310 nm.
At 28-Gb/s, the modulator showed an extinction ratio of 5.66 dB with a low driving voltage (V(pp) = 1.3 V) and power consumption (0.8 pJ/bit).

Conclusions:

The shield-CPW electrode design effectively suppresses parasitic SL modes, improving modulator performance.
The developed silicon MZI optical modulator offers high EO bandwidth and efficient operation at high data rates.
This technology holds promise for advanced optical communication systems requiring high speed and low power consumption.