50-GHz-Spacing Athermal Mach-Zehnder Interferometer-Synchronized Arrayed-Waveguide Grating With Improved Temperature Insensitivity

We describe a technique designed to compensate for the residual temperature sensitivity of an athermal silica-based arrayed-waveguide grating (AWG) and its application to a 50-GHz-spacing multi/demultiplexer with a low loss and a wide passband. The device has a Mach-Zehnder interferometer (MZI)-sync...

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Bibliographic Details
Published in:IEEE photonics technology letters 2009-09, Vol.21 (17), p.1205-1207
Main Authors: Kamei, S., Kitoh, T., Itoh, M., Shibata, T., Kohtoku, M.
Format: Article
Language:English
Subjects:
Arrayed waveguide gratings
Arrayed-waveguide grating (AWG)
athermal
Bandwidth
Channel spacing
Coupling circuits
Optical interferometry
Optical losses
optical planar waveguide components
Passband
planar lightwave circuit
Temperature dependence
Temperature distribution
Temperature sensors
wavelength-division multiplexing
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Summary:We describe a technique designed to compensate for the residual temperature sensitivity of an athermal silica-based arrayed-waveguide grating (AWG) and its application to a 50-GHz-spacing multi/demultiplexer with a low loss and a wide passband. The device has a Mach-Zehnder interferometer (MZI)-synchronized configuration, in which the AWG and the MZI are athermalized with resin-filled grooves. The point is that we employ a temperature-dependent phase-generating coupler (TD-PGC) in the MZI to compensate for the second-order temperature dependence of the AWG passband wavelength. The fabricated device exhibits practical characteristics including a low loss of less than 3.5 dB and a wide 0.5-dB bandwidth of 24.1 GHz as well as a reduced wavelength variation of less than 10 pm in a - 5degC to 65degC temperature range.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2009.2021271