A new method of fabricating Panda-type photosensitive polarization-maintaining erbium-doped fiber(PM-EDF) is
proposed and demonstrated. A sample of PM-EDF is fabricated using this method and an exhaustive analysis is made
about the characteristics of PM-EDF, the results shows that this method is practicable. Two fiber Bragg Gratings (FBGs)
are written into PM-EDF directly as the lasers reflectors, a three-states-tuned fiber laser is then obtained using a
polarization controller (PC).
The effect of non-ideal dispersion and reflection characteristics of chirped fiber Bragg gratings (CFBG)
on the 40-Gb/s and 10-Gb/s transmission is investigated. The effect of group delay ripple (GDR) on
eye-opening penalty (EOP) of carrier-suppressed return-to-zero (CSRZ) and return-to-zero (RZ)
formats is analyzed and compared. The system penalty for different amplitude and period ripples are
quantified.
A simple multi-wavelength erbium-doped fiber laser with narrow-line-width lasing output was proposed and
demonstrated using fiber Bragg gratings and Arrayed-Waveguide Gratings (AWG). Wavelength competition was
naturally prevented in this kind of laser by using AWG in the linear-cavity. As an example, a triple-wavelength erbium-doped
fiber laser was experimentally investigated. Using the laser scheme, the proposed laser can laser three
wavelengths simultaneously. The fiber laser retrieved the optical side-mode suppression ratio of over 50dB and the
average output power of -10.714, -10.649 and -10.578dBm at 1554.710, 1555.516 and 1556.421nm, respectively. And
the 3-dB bandwidth of each laser was less than 0.010nm. Moreover, the output power stability of the laser had also been
measured and analyzed. Experiment results showed that the laser can be operated stably in narrow-line-width with
single- and triple-wavelength output at room temperature.
Influence of stress area mismatched Panda erbium-doped polarization-maintaining fibre on the birefringence is analyzed
and compared by finite element method and approximate analytical expression educed by the complex variable method
of elasticity with superposition techniques.
A new near-elliptic inner cladding (NEIC) structure of polarization-stable highly birefringent photonic crystal fiber (HB-PCF)
is proposed and analyzed by using a full-vector finite element method (FEM) with anisotropic perfectly matched
layers. From the numerical results it is confirmed that, with the diameter of air hole A varied by ~10%, the modal
birefringence degradations of the three proposed NEIC-PCFs are less than 4.2 × 10-5, 6 × 10-5 and 1.17 × 10-4,
respectively, while the average birefringence is of the order of 2 × 10-3 at 1.55μm, which strongly proves that the
proposed structure is highly polarization-stable. Especially, the MFDs in x-direction and y-direction of NEIC-PCF with
three holes diminished in the center are measured as 5.8 μm and 2.6 μm, respectively, which are very attractive in the
application field of fiber optic sensor, e.g. fiber optic gyros.
A new near-elliptic cladding Polarization-maintaining photonic crystal fibre (PM-PCF) with four different hole diameters was proposed. Since the refractive index decreases gradually from x-axis to y-axis, less polarization coupling and high extinction ratio were obtained compared to the conventional PM-PCFs. Secondly, every hole diameter of near-elliptic cladding was optimized to get good performance, considering proper mode field diameter of x-axis and y-axis for better coupling to SLD and smaller confinement loss of the new PCF, high birefringence and high extinction ratio, especially the effects of disturbance on extinction ratio stability. According to series of comparison on different hole diameters and correlation between different holes, the optimum parameters of this new PCF of Λ=2.2μm, d1=2μm, d2=1.1μm, d3=1.7μm and d4=1.2μm were derived. The optimized near-elliptic cladding PCF can obtain both high extinction ratio (>29dB) and good extinction ratio stability (<2dB with ±10% transverse disturbance of d3) which is useful for practical use.
Some kinds of high birefringence photonic crystal fibers (PCFs) with elliptical inner cladding are analyzed by Galerkin
finite element method with transparent boundary conditions (TBC). Several properties of them, such as the birefringence,
confinement loss and dispersion are deduced and compared .It is shown that PCFs with different elliptical inner cladding
formed by enlarging or diminishing air holes have different properties. High birefringence can be obtained through
intruding the difference of air holes size along orthogonal direction. Enlarged air holes reduce the CL, and increase the
dispersion and dispersion slope; but diminished air holes is reversed.
Four types of YDFs with different Al3+ concentration and mole content of GeO2 were manufactured and the refractive
index and absorption spectra of these fibers were explored. With the comparison of four YDFs and detailed analyze, it
was found that higher Al3+ concentration leads to more GeO2 volatilization, which results in the refractive index decrease.
Therefore, mole content of GeO2 should be increased when co-doping Al3+ in YDF to maintain numerical aperture.
Meanwhile, the temperature of making porous layer should be controlled exactly to obtain good repetition of Al3+-
codoped YDF as the little change of temperature has little effect on mole content of GeO2 and SiO2 but has great effect
on compactness of porous layer. By drawing the fiber and testing the related parameters, the results show that the
optimum temperature range for making soot layer should between 1440°C and 1480°C where the absorption coefficients
were as high as 620dB/m with better repeatability. Finally, the ratio of GeO2 to SiO2 should be controlled to obtain long
fluorescence lifetime for fabricating highly ytterbium-doped fiber with required numerical aperture.
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