A new type of mode recoupling in a Bragg grating pair, in which one of the gratings is written in the fiber cladding, is proposed to overcome limitations of concatenated long-period and fiber Bragg gratings reported earlier [Opt. Lett. 27, 1214 (2002)]. Its reflection spectrum is similar to that of the previously reported concatenated grating structure; however, the reflectivity can be much larger than the previous limitation of 50%. Furthermore, avoidance of the loss induced by a long-period grating makes such a Bragg grating pair more attractive for practical applications.
© 2003 Optical Society of America
A. Ping Zhang, Hwa-Yaw Tam, and Xiao-Ming Tao, "Mode recoupling in a novel Bragg grating pair," Opt. Lett. 28, 519-521 (2003)