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Compact 3-dB tapered multimode interference coupler in silicon-on-insulator.

H Wei, J Yu, X Zhang

|November 28, 2007

Summary

Researchers developed a compact 3-dB multimode interference coupler using a novel parabolically tapered structure. This design significantly reduces device length while maintaining high performance for integrated photonic circuits.

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Area of Science:

Photonics
Integrated Optics
Semiconductor Devices

Background:

Multimode interference (MMI) couplers are fundamental components in integrated photonic circuits.
Traditional MMI couplers often require significant device lengths, limiting miniaturization.
Silicon-on-insulator (SOI) technology offers a platform for high-performance photonic devices.

Purpose of the Study:

To design and fabricate a compact 3-dB multimode interference coupler.
To reduce the footprint of MMI couplers through structural innovation.
To achieve high performance in terms of insertion loss and uniformity.

Main Methods:

Fabrication of a multimode interference coupler using a large silicon-on-insulator cross-section.
Implementation of a parabolically tapered structure to shorten the device length.
Characterization of the fabricated device for performance evaluation.

Main Results:

A compact 3-dB multimode interference coupler was successfully fabricated.
The device length was reduced to 398 micrometers.
Excellent uniformity of 0.28 dB was achieved.

Conclusions:

The proposed parabolically tapered structure is effective in reducing the length of 3-dB MMI couplers.
The fabricated device demonstrates high performance suitable for integrated photonic applications.
This compact design offers advantages for miniaturized photonic systems.