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High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis

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Broad-spectral-range synchronized flat-top arrayed-waveguide grating applied in a 225-channel cascaded spectrometer.

B I Akca¹, C R Doerr, G Sengo

¹Integrated Optical MicroSystems Group, MESA + Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands. B.I.Akca@utwente.nl

|October 6, 2012

Summary

This summary is machine-generated.

We developed a synchronized design for arrayed-waveguide gratings (AWGs) to flatten the passband over a wide 90 nm range. This method ensures a flat-top spectral response for improved optical communication performance.

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Area of Science:

Photonics
Optical Engineering
Integrated Optics

Background:

Arrayed-waveguide gratings (AWGs) are crucial for wavelength division multiplexing (WDM) but often suffer from non-flat passbands.
Achieving a flat passband over a broad spectral range is challenging, limiting AWG performance in optical communication systems.

Purpose of the Study:

To present a novel synchronized design for flattening the passband of an arrayed-waveguide grating (AWG).
To achieve a broad wavelength range of 90 nm with a flattened passband for enhanced optical signal integrity.

Main Methods:

A wavelength-insensitive 3-dB balanced coupler was designed for use in a Mach-Zehnder interferometer (MZI).
The MZI was configured with two balanced couplers, where phase deviation from one is cancelled by flipping the other.
This synchronized MZI was integrated in tandem with the AWG, feeding its output to the AWG's input.

Main Results:

Demonstrated a 5-channel, 18-nm-spacing AWG with a flat-top response.
Achieved a 0.5-dB bandwidth of 12 nm over a 90-nm spectral range.
Successfully demonstrated a low-loss cascaded AWG system using the MZI-synchronized flat-top AWG as a primary filter.

Conclusions:

The synchronized MZI design effectively flattens the AWG passband over a broad spectral range.
This technique enables the creation of high-performance, flat-top AWGs suitable for advanced WDM systems.
The demonstrated cascaded system highlights the practical application of this synchronized design for low-loss optical filtering.