Loss Uniformity Improvement of Arrayed-Waveguide Grating With Mode-Field Converters Designed by Wavefront Matching Method

We describe a silica-based arrayed-waveguide grating (AWG) with low channel-dependent loss variation achieved by using mode-field converters designed with the wavefront matching method. This mode-field converter converts the fundamental mode of the arrayed waveguide into the field distribution with...

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Bibliographic Details
Published in:Journal of lightwave technology 2009-12, Vol.27 (24), p.5710-5715
Main Authors: Sakamaki, Y., Kamei, S., Hashimoto, T., Kitoh, T., Takahashi, H.
Format: Article
Language:English
Subjects:
Applied sciences
Arrayed waveguide gratings
Arrayed-waveguide grating (AWG)
Circuit properties
Converters
design methodology
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Flexibility
Insertion loss
Integrated optics. Optical fibers and wave guides
Matching
Optical and optoelectronic circuits
Optical arrays
Optical losses
optical planar waveguides
Optical waveguides
Planar waveguides
Propagation losses
Slabs
Spectra
Variability
Wave fronts
Wavefronts
Waveguide transitions
Waveguides
Wavelength division multiplexing
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Description
Summary:We describe a silica-based arrayed-waveguide grating (AWG) with low channel-dependent loss variation achieved by using mode-field converters designed with the wavefront matching method. This mode-field converter converts the fundamental mode of the arrayed waveguide into the field distribution with a flat-top far field at the interface between the slab and output waveguides. We applied our mode-field converters to an AWG with a 100-GHz channel spacing and reduced the loss deviations experimentally from 2.4 to 0.7 dB over one free spectral range. Moreover, we confirmed that the introduction of our mode-field converters had no adverse effects on the AWG demultiplexing characteristics. It is notable that the loss uniformity was improved solely by replacing the conventional tapered waveguide between the arrayed waveguides and output slab waveguide with our mode-field converter without sacrificing the fabrication manageability or AWG design flexibility.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2009.2034030