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High-performance interrogator with bilateral input MMI-based AWG.

Shufeng Li, Pei Yuan, Ting Li

|February 1, 2024

Summary

This summary is machine-generated.

A new arrayed waveguide grating chip enhances fiber Bragg grating (FBG) interrogation by doubling channel count and reducing spacing. This compact device achieves a 13.5 nm dynamic range with high wavelength resolution and accuracy.

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Area of Science:

Optoelectronics and Photonics
Fiber Optic Sensing Technology

Background:

Compact fiber Bragg grating (FBG) interrogators are crucial for advanced fiber optic sensing.
Existing interrogation methods face limitations in channel density and spectral resolution.

Purpose of the Study:

To develop a dense spectral arrayed waveguide grating (AWG) chip for enhanced FBG interrogation.
To improve channel count and reduce spectral spacing without compromising device footprint or performance.

Main Methods:

Integration of a multimode interference (MMI) coupler with an AWG chip.
Achieving bilateral input phase-differential optical signals at the AWG input.
Optimization of interrogation channel selection methods.

Main Results:

The AWG chip effectively doubles the output channel count.
Reduced channel spacing is achieved without altering bandwidth or spectral slope.
Demonstrated dynamic range of 13.5 nm with 4 pm wavelength resolution and <20 pm accuracy.

Conclusions:

The developed AWG chip offers a significant advancement in compact FBG interrogation.
This technology enables higher density and more precise fiber optic sensing applications.
The MMI-AWG integration provides a scalable solution for future sensing systems.