DocumentCode :
769959
Title :
Diode laser wavelength tracking using an integrated dual slab waveguide interferometer
Author :
Cross, Graham H. ; Strachan, Ellen E.
Author_Institution :
Dept. of Phys., Durham Univ., UK
Volume :
14
Issue :
7
fYear :
2002
fDate :
7/1/2002 12:00:00 AM
Firstpage :
950
Lastpage :
952
Abstract :
The problem of tracking small changes in the output wavelength of laser diodes is addressed using a dual slab waveguide interferometer fabricated from silicon oxynitride. Waveguide mode dispersion differences between the waveguide modes provide a mechanism for identifying input wavelength shifts that are measured as shifts in the output far-field diffraction image. At visible wavelengths the device can transduce input wavelength changes into phase responses with a sensitivity of +0.9 rad/nm. The lower threshold limit of detection for laser output frequency shifts, is 2.2 GHz or 6 pm at a center wavelength of 635 nm. The TE and TM sensitivities to wavelength are approximately equivalent in the device described.
Keywords :
CCD image sensors; diffraction gratings; integrated optics; integrated optoelectronics; laser variables measurement; light diffraction; light interferometers; optical dispersion; optical testing; semiconductor device testing; semiconductor lasers; sensitivity; waveguide lasers; 635 nm; TE sensitivities; TM sensitivities; center wavelength; diode laser wavelength tracking; dual slab waveguide interferometer; input wavelength shifts; integrated dual slab waveguide interferometer; laser output frequency shifts; lower threshold limit; output far-field diffraction image; output wavelength; phase responses; sensitivity; silicon oxynitride; visible wavelengths; waveguide mode dispersion; waveguide modes; wavelength changes; Diffraction; Diode lasers; Dispersion; Frequency; Laser modes; Silicon; Slabs; Waveguide lasers; Waveguide transitions; Wavelength measurement;
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2002.1012395
Filename :
1012395
Link To Document :
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