UV-induced Bragg gratings are written into the three concentric GeO2-doped rings of an Yb3+-doped-core Cantor fractal
photonic-bandgap fibre. These rings can support several modes and the effective indices of these modes are derived
experimentally from the grating peaks. They are found to be in excellent agreement with numerical simulation.
We demonstrate the inscription of Bragg gratings in each of the three, concentric, germanium-doped rings of an
ytterbium-doped-core photonic-bandgap fibre. These rings can support several modes and the effective indices of these
modes are derived experimentally from the grating peaks. They are found to be in excellent agreement with numerical
simulation.
High birefringence optical fibers such as elliptical core fibers and many highly birefringent photonic crystal fibers
usually broke the symmetry of circle by introduced C2ν symmetry. In this paper, a novel microstructured high
birefringence optical fiber with C1ν symmetry is proposed. Four air holes were introduced into the core of a circular
optical fiber, circular symmetry was broken, and the core of this kind of optical fibers only maintained C1ν symmetry.
The degeneracy fundamental mode LP01 was split into two modes LPx01, LPy01 because the symmetry of C1v is lower than
that of C2ν , the difference between the patterns of the two modes field was larger. Using multipole method, we
calculated the propagation constants of modes LPx01 and LPy01, the modal birefringence B is to the magnitude of 10-2
which is almost tenfold greater than that of many highly birefringence photonic crystal fibers. The other advantage of
this kind of optical fibers is that the fabrication of fibers with a few air holes is easier than that of photonic crystal fibers
with many air holes.
Two-mode optical fibers have been studied extensively for telecommunication device and sensor application. This paper
investigates the evolution of polarization state in two-mode optical fibers. Two-mode Fibers usually support four modes,
i.e.
LPx01,
LPy01,
LPx11(even),
LPy11(even). The propagation constants of the four modes are different so that the polarization
state of an incident light will not maintain when the light propagating along the fiber. The evolution of the polarization
state in a two-mode optical fiber is analyzed in theory, the result shows that unlike a conventional highly birefringent
optical fiber, the polarization state of the incident light is not recurred at any length of the fiber; i.e. strictly speaking, the
beat length is not existed in a two-mode optical fiber. However, the every modal birefringence index of two modes can
be found by a wavelength scanning method. The power of the output light in a special polarization direction is detected;
it is a multi-cycle function, which depends on the wavelength of the incident light. Six periods can be given by using the
Fourier transform spectrum of the output light; they are in direct proportion to modal birefringent indices and the fiber
length, so three modal birefringence indices can be got. It is a most important property of the two-mode optical fibers for
device and sensor application.
We report a plastic holey fiber that has a strongly anisotropic structure. The polarization property of this microstructured plastic fiber was investigated. The result shows it has a high birefringence.
A polymer optical fiber amplifier (POFA) with double cladding was successfully prepared, The input signal at 595-nm wavelength was amplified (gain 5.6 dB) when the pump power at 532-nm wavelength was coupled into the inner cladding of the POFA with 43-cm length.
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