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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Broadband spatial mode conversion by chirped fiber bending.

D Ostling, H E Engan

|October 30, 2009

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Linearly chirped codirectional mode couplers significantly enhance bandwidth. This research provides design rules for broadband couplers, achieving a 5.8x wider bandwidth compared to uniform couplers.

Area of Science:

Photonics and Waveguide Devices
Optical Coupler Design
Chirped Grating Structures

Background:

Codirectional mode couplers are essential components in photonic integrated circuits.
Achieving broadband operation in these devices is a key challenge for many applications.
Existing uniform couplers have limited operational bandwidth.

Purpose of the Study:

To develop design rules for broadband codirectional mode couplers using linear chirp.
To theoretically and experimentally demonstrate the bandwidth enhancement capabilities of chirped couplers.
To provide a comparative analysis between chirped and uniform couplers.

Main Methods:

Solving the coupled-mode equations for linearly chirped codirectional mode couplers.

Related Experiment Videos

Last Updated: Jun 19, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Developing analytical design rules based on the derived solutions.

Fabricating and experimentally characterizing a chirped coupler and comparing its performance to a uniform coupler.

Main Results:

High coupling efficiency is achievable over a substantially wider bandwidth in chirped couplers compared to uniform ones.
A designed chirped coupler exhibited a 99% bandwidth of 47 nm at 1090 nm, 5.8 times larger than a comparable uniform coupler.
Experimental results validated the theoretical predictions, showing a bandwidth improvement factor of 5.4.

Conclusions:

Linear chirp is an effective strategy for designing broadband codirectional mode couplers.
The developed design rules enable the creation of photonic devices with significantly enhanced spectral performance.
Chirped couplers offer a viable solution for applications requiring wide operational bandwidths in integrated photonics.