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Dynamic behavior caused by Brillouin scattering in Raman fiber amplifiers is studied. Modes of self-pulsation steady state oscillations are found. Their dependence on amplification scheme is demonstrated.
Scanning near-field optical microscopy (SNOM) is an important tool for measurements of nanostructures as well as chemical and biosensing applications. A key parameter defining its usefulness is its resolution which depends of the geometrical size of SNOM probes and signal throughput in aperture tips and signal enhancement in apertureless ones. We analyse nanofocusing properties of an apertureless...
We propose a novel online physical-layer impairment-aware routing algorithm taking into account a minimum quality of transmission (QoT) constraint, which must be satisfied in all cases, even if the network load is changing, and new channels are activated. Our online constraint-based routing (CBR) algorithm considers the actual network load to get a more exact prediction of the signal quality degradation...
An interferometric setup for measuring Polarization Mode Dispersion (PMD) setup was tested. Using a low-coherence technique with a Michelson interferometer, it was possible to measure values of PMD from detected Differential Group Delay (DGD) values in two reels. The low-coherence source bounds the minimum value of DGD detected to 0.13 ps, leading to a minimum value detected around 0.14 ps. The mean...
For decades, passively mode locked fiber laser have been a very rich research field and today short pulsed laser with high energy and high repetition rate find many applications in areas of many fundamental research. In this paper, we propose a passively mode locked figure-eight fiber laser (8FL) totally made up of microstructured optical fiber (MOF) and incorporating two single mode passive fiber...
In this paper, we describe compact laser sources based on high-power amplification in Yb-doped silica fibers of ultra-stable mode-locked pulses from an all-fiber oscillator. The interplay between third-order nonlinearity, gain and chromatic dispersion in the polarization-maintaining fiber amplifier is engineered to produce high-quality, high-energy pulses suitable for nonlinear generation of light...
Experimental results obtained on 10 Gb/s RZ-DPSK transmission in a recirculating fiber-loop setup have shown that nonlinear amplifying loop mirrors (NALM) can efficiently enhance system performance: cascaded phase-preserving amplitude regeneration can efficiently prevent the accumulation of amplitude and nonlinear phase noise components in such systems. It was possible to significantly augment the...
In this paper passively mode-locked erbium doped fiber laser is described. With all-fiber cavity configuration 169 MHz fundamental repetition frequency and average output power of more than 30 mW were achieved. Output frequency comb spectrum of 28.5 nm and 111 fs pulses were obtained.
We report passive mode-locking of a soliton erbium-doped double-clad fiber laser operating at the 322nd harmonic of the fundamental cavity frequency. Repetition rates scalable up to 3 GHz have been obtained with a pulse duration of about 1 ps and a pulse energy of about 18 pJ. The supermode suppression at the 322nd harmonic is better than 25 dB. The dynamics of emergence of this operating regime is...
Using the ultrashort pulse and highly nonlinear fibers, we can obtain large nonlinear optical effects effectively. The group of author has been working on the highly functional optical control using ultrafast nonlinear optical effects induced by ultrashort pulse. We have demonstrated 1.55-2.0 mum and 1.0-1.7 mum widely wavelength tunable ultrashort pulse generation system by use of ultrashort pulse...
Supercontinuum generation study in dual core square lattice photonic crystal fibre made of multicomponent glass was performed. The fiber was excited by 100 fs pulses of Ti:sapphire based optical parametric amplifier system with tunability range of 1100 - 1500 nm. Zero dispersion point of the relevant modes in the studied fiber is in area 1200 - 1300 nm, so there was a possibility to excite the fiber...
Fiber-optic sensors are well suited for the measurement of a variety of physical quantities. Mechanical parameters like force, pressure, path length, velocity, acceleration, rotation rate, vibration, flow rate, filling level, bending, and mechanical strain up to breakage, can be measured. There are sensors for measurement of electric and magnetic fields as well as fluorescence, concentration, ph-value,...
Fiber lasers based on praseodymium-ytterbium doped fluoride glass fibers with silica fiber pigtails offer a wide range of different configurations. Here we present results of such fiber lasers in different ring configurations in an all-fiber setup. The fiber lasers are pumped with pigtailed laser diodes at 845 nm and deliver output powers up to 20 mW at 635 nm.
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