Switchable dual-wavelength fiber lasers with orthogonal polarizations, based on the semiconductor optical amplifier at room temperature, are proposed. One polarization-maintaining fiber Bragg grating (PMFBG) is used as the wavelength-selective filter in three different laser configurations. Owing to the polarization-dependent loss of the PMFBG, the laser can be designed to operate in stable dual-wavelength or wavelength-switching modes with a wavelength spacing of 0.336 nm at room temperature by adjusting a polarization controller in each laser configuration. The amplitude variation over nearly half an hour is less than 0.1 dB for both wavelengths in each laser configuration, which is more stable than that of erbium-doped fiber lasers with similar configuration.
The temperature dependence of fluorescence in erbium-doped silica fiber between ~-30 and ~150°C is discussed.
980nm pumping configuration is used in our experiment. 1450nm and 1531nm wavelengths are chosen to calculate the
FIR (fluorescence intensity ratio) at the first time instead of the mostly used wavelengths 525nm and 550nm. It shows
that as the temperature increases, the fluorescence intensity increases obviously at short wavelengths but changes a little
at long wavelengths. The temperature coefficient can achieve ~0.023dB/°C, and its resolution is improved as the
temperature decreases. Because there are many effects in our experiments, so it shows a deviation from the behavior of
simulation.
A high concentration silica host Erbium Doped Fiber with Bismuth-Gallium-Aluminum co-doped was fabricated. The
absorption coefficient of this fiber was up to 19dB/m at the wavelength of 980nm and 42dB/m at 1530nm. Ring structure
lasers with different fiber lengths were presented. Their output characteristics were measured and analyzed.
Dual-wavelength with orthogonal polarizations erbium-doped fiber ring laser at room temperature is proposed. One
polarization-maintaining fiber Bragg grating (PMFBG) in a Sagnac loop interferometer is used as the wavelength-selective
filter. Due to the polarization hole burning (PHB) enhanced by the PMFBG, the laser can operate in stable dual-wavelength
operation with wavelength spacing of 0.336 nm at room temperature by adjusting a polarization controller
(PC). The optical signal-to-noise ratio (OSNR) is over 52 dB. The amplitude variation in nearly one and half an hour is
less than 0.6 dB for both wavelengths.
A novel design of M-Profile Ytterbium doped Fibers (YDFs) for high power fiber Lasers was given. The output power
was two times higher than that in standard double-cladding fiber under the same threshold of damage.
The finite element method is applied for solving the modal field of erbium-doped hole-assisted lightguide fiber
(EDHALF). The modified average population inversion iteration method is proposed for simulating the gain coefficients
of EDHALF amplifiers. The relation between the structural parameters of EDHALFs and the gain coefficient of L band
EDHALF amplifiers is investigated by means of the finite element method combined with the modified average
population inversion method. Four structural parameters of EDHALF-core diameter, the refractive index difference
between the core and silica cladding, the relative hole-to-core spacing and the relative size of air holes are optimized in
terms of the design criteria of L band erbium-doped fiber, which take into account the cutoff wavelengths, the gain
coefficients of L band fiber amplifiers and the splice loss between the EDHALF and the conventional single-mode fiber.
At last, the comparisons between the EDHALF and the conventional erbium-doped fiber for L band applications are
made.
The dispersion properties of the index-step higher order mode dispersion-compensating fibers (HOM-DCFs) are
simulated using an unequal interval finite difference method in this paper. Large negative dispersion of the first few
higher order modes (HOMs) near cutoff are studied comparatively, which is helpful for designing the dispersion
compensator based HOM-DCFs.
The relationship between the gain flatness performances with the pump wavelength spacing in single-stage backward-pumped
distributed fiber Raman amplifiers (B-DFRAs) were demonstrated theoretically. It was shown that the gain
spectrum of B-DFRA which pump wavelengths were arranged in a geometric proportion interval sequence were flatter
than one which pump wavelengths were arranged in an equal interval sequence in the same conditions.
In this letter, aiming to obtain the best multicast performance of optical network in which the video conference
information is carried by specified wavelength, we extend the solutions of matrix games with the network coding theory
and devise a new method to solve the complex problems of multicast network switching. In addition, an experimental
optical network has been testified with best switching strategies by employing the novel numerical solution designed
with an effective way of genetic algorithm. The result shows that optimal solutions with genetic algorithm are
accordance with the ones with the traditional fictitious play method.
In this paper we mainly discuss the low-cost way to improve the performances of wavelength routed optical networks. It
is really a tough work to reduce the probability of traffic loss due to the lack of abundant lightpath between arbitrary
nodes connected by precious wavelengths. Aiming to solve the problem, we probe an economical proposal that local
optical nodes can be equipped with extra receiving components with cheap Chirp Bragg Gratings. Under the
experimental platform of single-direction double-fibers optical network rings, this scheme has been verified, showing
the result that the traffic loss ratio can be reduced significantly by adding more Chirp Bragg Gratings especially under
heavy service loads. Consequently, it is feasible to improve the performance of all optical networks with several groups
of Chirp Bragg grating fibers with whole consideration of cost-effective optical network design.
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