NDLI: Backscatter Compensation in IFOG Based Inertial Measurement Units With Polymer Phase Modulators

Content Provider	IEEE Xplore Digital Library
Author	Sanghadasa, M. Ashley, P.R. Lindsay, G.A. Bramson, M.D. Tawney, J.
Copyright Year	1983
Abstract	Precision guidance in navigation systems requires highly accurate, compact, and low cost inertial measurement units (IMUs). The key active guided-wave component of the IMU is the phase modulator. In our approach, electro-optic polymers have been utilized in fabricating low loss phase modulators with low half-wave drive voltage using advanced hybrid waveguide fabrication processes and novel optical integration techniques. However, the interference between the primary wave and the backscatter waves generated by the phase modulator and/or the interference between the two counter-propagating backscatter waves at the detector of the IMU has been a major source of error in this approach. A novel technique was introduced in assessing the error caused by backscatter and an offset waveguide design was developed to suppress the interference of backscatter light. The novel design not only preserved the miniaturization, but also improved the insertion loss with the use of a shorter waveguide. The gyro level tests performed with the backscatter compensated modulators showed about 5 times improvement of the average bias uncertainty over gyros integrated with a standard symmetric phase modulator.
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	806
Ending Page	813
Page Count	8
File Size	2343449
File Format	PDF
ISSN	07338724
Volume Number	27
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Backscatter Measurement units Phase modulation Optical waveguides Optical polymers Interference Navigation Costs Optical losses Low voltage polymer waveguides Electro-optic polymers gyroscopes integrated optics devices
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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