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Updated: Jun 26, 2026

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation

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Published on: May 27, 2013

Parabolic tapered structure for an ultracompact multimode interference coupler.

¹Department of Electronics and Communication Engineering, Tezpur University, Assam, India. pps@tezu.ernet.in

|January 13, 2009

Summary

A novel parabolic tapered structure for 2x2 multimode interference (MMI) couplers significantly reduces coupling length. This design, using silicon oxinitride waveguides, halves the beat length compared to conventional MMI couplers.

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Last Updated: Jun 26, 2026

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation

Published on: May 27, 2013

Area of Science:

Photonics and Optical Engineering
Integrated Optics
Waveguide Devices

Background:

Multimode interference (MMI) couplers are fundamental components in integrated optics.
Reducing the coupling length of MMI couplers is crucial for device miniaturization and performance enhancement.
Conventional MMI coupler designs face limitations in achieving shorter coupling lengths.

Purpose of the Study:

To propose and theoretically investigate a parabolic tapered structure for 2x2 MMI couplers.
To reduce the coupling length of MMI couplers.
To compare the performance of the proposed tapered MMI coupler with conventional designs.

Main Methods:

Theoretical analysis using a mathematical model based on sinusoidal modes.
Simulation of coupling behaviors in silicon oxinitride (SiON) waveguides.
Comparison of beat length and fabrication tolerance with existing MMI structures.

Main Results:

The proposed parabolic tapered MMI coupler exhibits a beat length approximately half that of a conventional MMI coupler.
The study analyzes the effect of power imbalance on fabrication tolerance.
The tapered structure demonstrates improved characteristics compared to other MMI designs.

Conclusions:

The parabolic tapered structure offers a significant reduction in coupling length for 2x2 MMI couplers.
This design shows potential for creating more compact and efficient photonic devices.
Further investigation into fabrication tolerance is warranted for practical applications.