Demultiplexer with 120 channels and 0.29-nm channel spacing

A 120-channel WDM demultiplexer was fabricated by etching a concave grating into a SiO/sub 2/-SiON-SiO/sub 2/-Si slab waveguide. The grooves of the grating reflected light by two instances of total internal reflection. The device was suitable for demultiplexing wavelength channels in the 1530-1565-n...

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Bibliographic Details
Published in:IEEE photonics technology letters 1998-01, Vol.10 (1), p.90-92
Main Authors: Sun, Z.J., McGreer, K.A., Broughton, J.N.
Format: Article
Language:English
Subjects:
Absorption
Channel spacing
Demultiplexing
Etching
Gratings
Insertion loss
Optical fiber devices
Optical reflection
Slabs
Wavelength division multiplexing
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Summary:A 120-channel WDM demultiplexer was fabricated by etching a concave grating into a SiO/sub 2/-SiON-SiO/sub 2/-Si slab waveguide. The grooves of the grating reflected light by two instances of total internal reflection. The device was suitable for demultiplexing wavelength channels in the 1530-1565-nm range with a 0.29-nm (36 GHz) channel spacing. Each channel had a spectral width (full width at half maximum) of about 0.18 nm. The fiber-to-fiber insertion loss was between -20 dB and -30 dB for most channels. The loss was predominantly due to waveguide absorption and increased dramatically for wavelengths below 1539 nm.
ISSN:1041-1135
1941-0174
DOI:10.1109/68.651118