An Optical Waveguide with High Birefringence and Birefringence Dispersion for Optical Beamforming Network in Multibeam Array Antenna

Weiwei HU  Keizo INAGAKI  Takashi OHIRA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E84-B   No.7   pp.1801-1807
Publication Date: 2001/07/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Adaptive Array Antenna Techniques for Advanced Wireless Communications)
Category: Beamformer Techniques
Keyword: 
Ti:LiNbO3 optical waveguide,  birefringence,  optical beamforming network,  multibeam phase array antenna,  

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Summary: 
In this paper, we report on our recent work in designing and developing an optical waveguide and optical integrated circuit for optical BFN in adaptive multibeam array antenna. We introduce a new integrated Ti:LiNbO3 waveguide and prove that it is able to yield large birefringence and birefringence dispersion. We present a new technique using a microwave-modulated optical wave to measure the birefringence in integrated Ti:LiNbO3 optical waveguides. The measuring results show that the new waveguide has a birefringence of 0.08 and birefringence dispersion of 0.05 µm-1 at optical wavelength of 1.55 µm. When the new Ti:LiNbO3 is applied to form a integrated optical waveguide array in optical beamforming network, it is shown that microwave phase shifts within the range of [-180, +180] is achieved by tuning the optical wavelength 10 nm around 1.55 µm.