Related Experiment Video
Updated: Feb 8, 2026

Writing Bragg Gratings in Multicore Fibers
Published on: April 20, 2016
Multi-wavelength add-drop filter with phase-modulated shifted Bragg grating
Abstract:
We present, for the first time to the best of our knowledge, a multichannel add-drop operation with a phase-modulated shifted Bragg grating based filter. The device is realized in a silicon-on-insulator waveguide platform with TiO2 as a coating material to reduce the refractive index contrast. The operation is shown for three and five wavelength channels within the telecom C-band. A line width of 0.6 nm with an extinction ratio of 20 dB is achieved. The shifted Bragg grating is modulated maintaining a modal phase-matching condition for multiple wavelengths. The phase function is calculated with an iterative Fourier transform algorithm. The experimental results are in very good agreement with the design.
Related Concept Videos
The de Broglie Wavelength
Passive Filters
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
Active Filters
Phase Diagrams
Phase Transitions
Excess Pressure Inside a Drop and a Bubble

