'A'
High group birefringence in photonic crystal fibers with both positive and negative phase birefringences
Author(s): Zhang L (Zhang, Lin), Luo T (Luo, Ting), Yue Y (Yue, Yang), Willner AE (Willner, Alan E.)  
Source: JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS    Volume: 10    Issue: 3  Article Number: 035004    Published: MAR 2008  
Authors' address:
Univ So Calif, Dept Elect Engn, Los Angeles, CA 90089 USA

'B'
Theory of electrically controllable long-period gratings built in liquid-crystal fibers
Author(s): Jeong Y, Lee B  
Source: OPTICAL ENGINEERING    Volume: 40    Issue: 7    Pages: 1227-1233    Published: JUL 2001