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Ultrabroad-bandwidth electro-optic modulator based on a cascaded Bragg grating.

J B Khurgin, J U Kang, Y J Ding

|December 7, 2007

Summary

Researchers enhanced electro-optical modulator bandwidth using group velocity matching with cascaded Bragg gratings. This approach enables high-speed modulators for advanced optical communication systems.

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Area of Science:

Photonics and Optoelectronics
Materials Science

Background:

Traveling-wave electro-optical modulators are crucial components in high-speed optical communication.
Achieving broad bandwidth in these modulators is limited by velocity mismatch between optical and radio frequency (rf) waves.
Existing designs often struggle to meet the demands of next-generation data transmission.

Purpose of the Study:

To significantly increase the bandwidth of traveling-wave electro-optical modulators.
To propose a novel modulator design utilizing cascaded Bragg gratings for enhanced performance.
To evaluate the feasibility of a Lithium Niobate (LiNbO3) Mach-Zehnder modulator for ultra-high bandwidth applications.

Main Methods:

Implementing group velocity matching for optical and rf waves within waveguides.

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Utilizing cascaded Bragg gratings to control wave propagation and achieve velocity synchronization.

Simulating and analyzing the performance of a Lithium Niobate (LiNbO3) Mach-Zehnder modulator design.

Main Results:

Demonstrated a method to greatly increase modulator bandwidth through precise group velocity matching.
Proposed a Lithium Niobate (LiNbO3) Mach-Zehnder modulator design.
Achieved a simulated half-wave voltage of 1-V and a bandwidth exceeding 100 GHz.

Conclusions:

Group velocity matching with cascaded Bragg gratings is an effective strategy for ultra-wideband electro-optical modulators.
The proposed LiNbO3 Mach-Zehnder modulator design shows promise for high-performance optical communication.
This advancement paves the way for faster and more efficient optical data transmission systems.