Abstract
We have UV-inscribed and theoretically and experimentally analyzed fiber
gratings with the structure tilted at 45° and implemented this type
of devices as an in-fiber polarizer. A systematic investigation has been
carried out on the characterization of 45° tilted fiber gratings (45° TFGs) in terms of the polarization-dependant loss (PDL) and
thermal response. The detailed theoretical modeling has revealed a linear
correlation between the grating length and the PDL, which has been proved by
the experimental results. For the first time, we have examined the UV beam
diffraction from a tilted phase mask and designed the UV-inscription system
to suit the 45° TFG fabrication. Experimentally, a 24 mm
long 45° TFG UV-inscribed in standard telecom single-mode fiber exhibited
around 25 dB PDL at 1530 nm and an over ~300 nm bandwidth of PDL
spectrum. By the concatenation method, a 44 mm long grating showed a PDL as
high as 40 dB that is close to the high polarization extinction ratio of
commercial products. Moreover, we have revealed that the PDL of 45° TFGs has low thermal
influence, which is desirable for real application devices. Finally, we
experimentally demonstrated an all-fiber twist sensor system based on a
45° and an 81° TFG.
© 2011 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription