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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Published on: February 4, 2018

Low-loss, flat-passband and athermal arrayed-waveguide grating multi/demultiplexer.

Koichi Maru¹, Yukio Abe

¹Information System Products Division, Hitachi Cable, Ltd., 880 Isagozawa-cho, Hitachi-shi, Ibaraki, Japan. maru.koichi@hitachi-cable.co.jp

|June 25, 2009

Summary

Researchers developed a low-loss, athermal arrayed-waveguide grating (AWG) multi/demultiplexer using silica planar lightwave circuit technology. This device offers stable performance across a wide temperature range, crucial for optical communication systems.

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Area of Science:

Photonics and Optical Engineering
Materials Science for Telecommunications

Background:

Arrayed-waveguide gratings (AWGs) are key components in wavelength division multiplexing (WDM) systems.
Temperature sensitivity of AWGs can lead to wavelength shifts and performance degradation.
Mach-Zehnder interferometers (MZIs) are used for optical signal routing.

Purpose of the Study:

To demonstrate a low-loss, flat-passband, and athermal AWG multi/demultiplexer.
To compensate for temperature dependence in AWG devices.
To achieve stable optical performance over a range of operating temperatures.

Main Methods:

Fabrication of a 32-channel AWG multi/demultiplexer using silica-based planar lightwave circuit (PLC) technology.
Integration of a Mach-Zehnder interferometer (MZI) as an input router.
Incorporation of resin-filled trenches in the MZI and AWG slab to mitigate thermal effects.

Main Results:

Achieved a low insertion loss of 3.3-3.7 dB.
Demonstrated flat-passband spectra.
Obtained a minimal temperature-dependent wavelength shift of 0.02 nm over a -5 to 65 degrees C range.

Conclusions:

The developed AWG multi/demultiplexer exhibits excellent thermal stability and low loss.
The use of resin-filled trenches effectively compensates for temperature-induced wavelength shifts.
This athermal AWG technology is suitable for advanced optical communication networks.