Abstract
The fiber gratings fabrication technology with the heating method in a
photonic crystal fiber (PCF) based on structural change is examined. The principle
of photonic crystal fiber gratings (PCFGs) is analyzed in theory. The heat transfer
theory and finite element method are used to examine the thermal field distribution
in the fiber and the influence of the air hole structure in the cladding, and the
parameters of the laser beam in the process of grating fabrication are discussed.
The results show that gratings can be formed by the periodic collapse of air holes
in the cladding of PCFs. Under double-point heating condition, the energy is
uniformly distributed in the radial direction and is approximate to Gaussian
distribution in the axial direction. With the same size of the luminous spot, as the
layers and radius of the air holes increase, the laser power needed to make the air
holes collapse decreases. With the same laser power, as the luminous spot radius
increases, the needed heating time increases. Moreover, the relationship between the
laser power needed and the air filling rate is obtained as the number of layers of
the air holes changes from 1 to 7. This kind of PCFG can overcome the long-term
thermal instability of conventional gratings in substance and thus has great
potential applications in the related field of optical fiber sensors.
© 2011 Chinese Optics Letters
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