SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "L773:1094 4087 ;lar1:(ri)"

Sökning: L773:1094 4087 > RISE

  • Resultat 1-10 av 60
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Alcusa-Sáez, E. P., et al. (författare)
  • Acousto-optic interaction in polyimide coated optical fibers with flexural waves
  • 2017
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 25:15, s. 17167-17173
  • Tidskriftsartikel (refereegranskat)abstract
    • Acousto-optic coupling in polyimide-coated single-mode optical fibers using flexural elastic waves is demonstrated. The effect of the polyimide coating on the acousto-optic interaction process is analyzed in detailed. Theoretical and experimental results are in good agreement. Although the elastic attenuation is significant, we show that acousto-optic coupling can be produced with a reasonably good efficiency. To our knowledge, it is the first experimental demonstration of acousto-optic coupling in optical fibers with robust protective coating.
  •  
2.
  • Brunetti, Anna Chiara, et al. (författare)
  • Raman probes based on optically-poled double-clad fiber and coupler
  • 2012
  • Ingår i: Optics Express. - 1094-4087. ; 20:27, s. 28563-28572
  • Tidskriftsartikel (refereegranskat)abstract
    • Two fiber Raman probes are presented, one based on an optically-poled double-clad fiber and the second based on an opticallypoled double-clad fiber coupler respectively. Optical poling of the core of the fiber allows for the generation of enough 532nm light to perform Raman spectroscopy of a sample of dimethyl sulfoxide (DMSO), when illuminating the waveguide with 1064nm laser light. The Raman signal is collected in the inner cladding, from which it is retrieved with either a bulk dichroic mirror or a double-clad fiber coupler. The coupler allows for a substantial reduction of the fiber spectral background signal conveyed to the spectrometer.
  •  
3.
  • Camara, Alexandre R., et al. (författare)
  • Optical creation and erasure of the linear electrooptical effect in silica fiber
  • 2015
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 23:14, s. 18060-18069
  • Tidskriftsartikel (refereegranskat)abstract
    • We study the creation and erasure of the linear electrooptical effect in silicate fibers by optical poling. Carriers are released by exposure to green light and displaced with simultaneous application of an internal dc field. The second order nonlinear coefficient induced grows with poling bias. The field recorded (similar to 10(8) V/m) is comparable to that obtained through classical thermal poling of fibers. In the regime studied here, the second-order nonlinearity induced (similar to 0.06 pm/V) is limited by the field applied during poling (1.2 x 10(8) V/m). Optical erasure with high-power green light alone is very efficient. The dynamics of the writing and erasing process is discussed, and the two dimensional (2D) field distribution across the fiber is simulated. (C) 2015 Optical Society of America
  •  
4.
  • Camara, Alexandre, et al. (författare)
  • Study of thermally poled fibers with a two-dimensional model
  • 2014
  • Ingår i: Optics Express. - 1094-4087. ; 22:15, s. 17700-17715
  • Tidskriftsartikel (refereegranskat)abstract
    • A two-dimensional (2D) numerical model is implemented to describe the movement of ions under thermal poling for the specific case of optical fibers. Three types of cations are considered (representing Na+, Li+ and H3O+) of different mobility values. A cross-sectional map of the carrier concentration is obtained as a function of time. The role of the various cations is investigated. The assumptions of the model are validated by comparing the predictions to experimental data of the time evolution of the nonlinearity induced. A variational analysis of poling parameters including temperature, poling voltage, sign of the bias potential and initial ionic concentrations is performed for a particular fiber geometry. The analysis allows identifying the impact of these parameters on the induced second-order nonlinearity in poled fibers.
  •  
5.
  •  
6.
  •  
7.
  • Coronel, Edvin, et al. (författare)
  • Evaluation of Pearson correlation coefficient and Parisi parameter of replica symmetry breaking in a hybrid electronically addressable random fiber laser
  • 2021
  • Ingår i: Optics Express. - : The Optical Society. - 1094-4087. ; 29:15, s. 24422-24433
  • Tidskriftsartikel (refereegranskat)abstract
    • The hybrid electronically addressable random (HEAR) laser is a novel type of random fiber laser that presents the remarkable property of selection of the fiber section with lasing emission. Here we present a joint analysis of the correlations between intensity fluctuations at distinct wavelengths and replica symmetry breaking (RSB) behavior of the HEAR laser. We introduce a modified Pearson coefficient that simultaneously comprises both the Parisi overlap parameter and standard Pearson correlation coefficient. Our results highlight the contrast between the correlations and presence or not of RSB phenomenon in the spontaneous emission behavior well below threshold, replica-symmetric ASE regime slightly below threshold, and RSB phase with random lasing emission above threshold. In particular, in the latter we find that the onset of RSB behavior is accompanied by a stochastic dynamics of the lasing modes, leading to competition for gain intertwined with correlation and anti-correlation between modes in this complex photonic phase. 
  •  
8.
  • Dely, H., et al. (författare)
  • High bitrate data transmission in the 8-14 µm atmospheric window using an external Stark-effect modulator with digital equalization
  • 2023
  • Ingår i: Optics Express. - : Optica Publishing Group (formerly OSA). - 1094-4087. ; 31:5, s. 7259-7264
  • Tidskriftsartikel (refereegranskat)abstract
    • High bitrate mid-infrared links using simple (NRZ) and multi-level (PAM-4) data coding schemes have been realized in the 8 µm to 14 µm atmospheric transparency window. The free space optics system is composed of unipolar quantum optoelectronic devices, namely a continuous wave quantum cascade laser, an external Stark-effect modulator and a quantum cascade detector, all operating at room-temperature. Pre- and post-processing are implemented to get enhanced bitrates, especially for PAM-4 where inter-symbol interference and noise are particularly detrimental to symbol demodulation. By exploiting these equalization procedures, our system, with a full frequency cutoff of 2 GHz, has reached transmission bitrates of 12 Gbit/s NRZ and 11 Gbit/s PAM-4 fulfilling the 6.25 % overhead hard-decision forward error correction threshold, limited only by the low signal-to-noise ratio of our detector. 
  •  
9.
  • Deniel, L., et al. (författare)
  • DAC-less PAM-4 generation in the O-band using a silicon Mach-Zehnder modulator
  • 2019
  • Ingår i: Optics Express. - : OSA - The Optical Society. - 1094-4087. ; 27:7, s. 9740-9748
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate 20-Gb/s 4-level pulse amplitude modulation (PAM-4) signal generation using a silicon Mach-Zehnder modulator (MZM) in the O-band. The modulator is driven by two independent binary streams, and the PAM-4 signal is thus generated directly on the chip, avoiding the use of power-hungry digital-to-analog converters (DACs). With optimized amplitude levels of the binary signals applied to the two arms of the MZM, a pre-forward error correction (FEC) bit-error rate (BER) as low as 7.6 × 10 −7 is obtained. In comparison with a commercially available LiNbO 3 modulator, the penalty is only 2 dB at the KP4 FEC threshold of 2.2 × 10 −4
  •  
10.
  • Etcheverry, Sebastián, et al. (författare)
  • Fluidic trapping and optical detection of microparticles with a functional optical fiber
  • 2017
  • Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 25:26, s. 33657-33663
  • Tidskriftsartikel (refereegranskat)abstract
    • A fiber probe is presented that traps single micro-sized particles and allows detection of their optical properties. The trapping mechanism used is based on fluid suction with a micro-structured optical fiber that has five holes along its cladding. Proof-of-principle experiments with a diluted solution of fluorescently labeled particles are performed. The fiber probe presented here may find various applications in life-science and environmental monitoring. ©
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 60

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy