Inline fiber polarization-rocking rotator and filter.
01 January 1984
An inline polarization rotator has been built into a single- mode birefringent fiber. The rotator utilizes periodic twists of the fiber's principle axis which were formed by rocking the preform as the fiber was drawn. The polarization conversion between the principal axis is wavelength dependent with a bandwidth inversely proportional to the number of twist periods. The peak wavelength can be tuned with axial tension or with temperature. The bandwidth of the present rotator was 4.8 nm for 100 percent conversion in a fiber length of 170 cm.