IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
Monolithically integrated grating and deflector structure for wavelength filtering
Hideaki Okayama
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JOURNAL FREE ACCESS

2005 Volume 2 Issue 4 Pages 121-126

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Abstract

A simple integrated deflector and grating structure is proposed for a wavelength filtering. The deflector is composed of a channel waveguide and a slab waveguide with a tapered gap between them to generate a Gaussian light beam in the slab waveguide. The echelle type grating is formed at the end of the slab waveguide. The distance between the grating and the deflector is 100-200µm. The device is designed using diffraction theory. The filter response is verified using bi-directional BPM. Tuning range of 25nm for 5.4 × 10-3 refractive index change and filter passband width of 15nm were attained by a 350µm long device at 1500nm wavelength.

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© 2005 by The Institute of Electronics, Information and Communication Engineers
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