Scheduled System Maintenance:
On Monday, April 27th, IEEE Xplore will undergo scheduled maintenance from 1:00 PM - 3:00 PM ET (17:00 - 19:00 UTC). No interruption in service is anticipated.
By Topic

Constant-width variable-index transition for efficient Ti:LiNbO3waveguide-fiber coupling

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Suchoski, P. ; United Technologies Research Center, East Hartford, CT, USA ; Ramaswamy, R.V.

A novel constant-width variable-index transition has been developed that allows for both low-loss fiber-waveguide coupling and efficient device operation on the same lithium niobate chip. A thick titanium film (750 Å) is utilized at the input end of the transition, resulting in large Del\tan and tight mode confinement. At the output of the transition, the waveguide is designed to be close to cutoff by decreasing the Ti thickness to 375 Å. This causes the mode size to increase so that mode coupling loss between a small mode-size waveguide ( 1/e intensity full width of 4.25 μm by full depth of 2.80 μm) and a single-mode fiber ( 1/e intensity full width of 7 μm) is reduced by approximately 1.4 dB per interface at 1.3-μm wavelength.

Published in:

Lightwave Technology, Journal of  (Volume:5 ,  Issue: 9 )