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Updated: Jul 9, 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

All-fiber zero-insertion-loss add-drop filter for wavelength-division multiplexing.

A S Kewitsch, G A Rakuljic, P A Willems

|December 18, 2007

Summary

We created a novel all-fiber add-drop filter using a Bragg grating in a fused fiber coupler. This polarization-independent device offers low insertion loss and high efficiency for optical signal processing.

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Published on: November 22, 2019

Area of Science:

Optoelectronics
Fiber Optics
Nanophotonics

Background:

All-fiber devices offer advantages in size and integration for optical signal processing.
Add-drop filters are crucial components for wavelength-selective signal routing in optical networks.
Existing filters often face challenges with insertion loss, bandwidth, and polarization dependence.

Purpose of the Study:

To develop and fabricate a high-performance all-fiber add-drop filter.
To demonstrate the filter's capabilities in terms of insertion loss, spectral bandwidth, and add-drop efficiency.
To achieve polarization-independent operation for practical applications.

Main Methods:

Fabrication of an asymmetric mode converter-coupler by adiabatic tapering and fusing of dissimilar single-mode optical fibers.
Recording a Bragg grating within the waist of the fabricated fiber coupler.
Characterization of the filter's performance, including insertion loss, spectral bandwidth, add-drop efficiency, and polarization dependence.

Main Results:

The developed all-fiber add-drop filter exhibited a low insertion loss of approximately 0.1 dB.
A narrow spectral bandwidth of less than 1 nm was achieved.
A high add-drop efficiency exceeding 90% was demonstrated.
The filter was confirmed to be polarization independent.

Conclusions:

The fabricated all-fiber add-drop filter demonstrates excellent performance characteristics.
The device's low insertion loss, narrow bandwidth, high efficiency, and polarization independence make it suitable for advanced optical signal processing.
This technology offers a promising solution for integrated optical systems and wavelength-selective routing.