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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Method of achieving phase delay with wide optical bandwidth in multimode interference devices.

R M Lorenzo, C Llorente, E J Abril

|December 20, 2007

Summary

This study introduces a passive method for phase delays in multimode interference devices, enabling efficient waveguide design for optical mode conversion with minimal loss and broad bandwidth.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Published on: August 12, 2013

Area of Science:

Photonics and Waveguide Optics
Integrated Optics Devices

Background:

Traditional methods for phase delays in optical devices often rely on active elements or suffer from wavelength sensitivity.
Multimode interference (MMI) devices are crucial for integrated optical circuits, but precise phase control is challenging.

Purpose of the Study:

To present a novel, completely passive method for achieving phase delays within multimode interference devices.
To design and analyze a zero-to-one mode converter utilizing this passive phase delay technique.

Main Methods:

Achieving relative phase shifts by precisely adjusting waveguide widths and tapers within the MMI section.
Designing a zero-to-one mode converter based on the developed passive delay line approach.

Main Results:

The designed mode converter demonstrates minimal excess loss: 0.100 for TE and 0.102 for TM polarization.
A significantly large 1-dB bandwidth exceeding 350 nm was achieved, indicating robust performance across a wide spectral range.

Conclusions:

The proposed passive phase delay method offers an effective alternative to active elements, enhancing device stability and reducing wavelength dependency.
This technique facilitates the development of high-performance optical mode converters with excellent loss and bandwidth characteristics.