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Experimental confirmation of matched bends.

Andrea Melloni¹, Giuseppe Cusmai, Mario Martinelli

¹Dipartimento di Elettronica e Informazione, Politecnico di Milano, Via Ponzio 34/5, Milan 20133, Italy. melloni@elet.polimi.it

|March 10, 2004

Summary

Researchers experimentally confirmed modal conversion control in bent optical waveguides. This precise control in high-index-contrast integrated-optical bent waveguides prevents losses and impairments in Y branches.

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Area of Science:

Integrated optics
Waveguide theory
Photonics

Background:

Bent waveguides are crucial components in integrated optical circuits.
Understanding modal conversion is essential for efficient light manipulation.
High-index-contrast waveguides offer unique optical properties.

Purpose of the Study:

To experimentally investigate modal conversion in bent waveguides.
To confirm the matched bend condition in cascaded bends.
To analyze the impact of bends on Y branches and control modal conversion.

Main Methods:

Experimental investigation of modal conversion.
Fabrication and testing of high-index-contrast integrated-optical bent waveguides.
Analysis of Y branches with matched and unmatched bends.

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Main Results:

Experimental confirmation of the matched bend condition on cascaded bends.
Demonstration of controlled modal conversion between fundamental and first-order leaky modes.
Good agreement between theoretical predictions and experimental results for monomode and multimode waveguides.
Validation of control strategies to avoid losses and transfer function impairments.

Conclusions:

Modal conversion in bent waveguides can be accurately controlled.
Controlled modal conversion prevents additional losses and transfer function impairments.
Findings are applicable to both monomode and multimode waveguides for improved device performance.