RESUMEN
A multi-wavelength fiber laser can be used as an ideal light source device for optical communication of wavelength-division multiplexing. A type of combined filter composed of a gold nanoparticle saturated absorber and three-wave polarization controller was constructed. Its multi-wavelength laser output is realized in an erbium-doped fiber ring laser. We studied the degradation of single-wavelength, dual-wavelength, and triple-wavelength output in the range of 1555-1565 nm, the tunability of three wavelengths, and the spectral periodicity of 1 min 57 s. The interesting phenomena of subregional transmission of gold nanoparticles were discovered. We have a clearer understanding of the filtering process of gold nanosaturable absorbers and the special state between pulsed and non-pulsed when using them to achieve ultra-short pulsed lasers.
RESUMEN
The aim of this study was to study the clinical value of prethrombotic state and treatment with low molecular weight heparin (LMWH) in senile patients with acute exacerbations of chronic obstructive pulmonary disease (AECOPD) combined with respiratory failure. Hemorheological markers (hematocrit, blood viscosity and plasma viscosity), fibrinogen (FIB), D-dimer and gas analysis were evaluated in 30 senile patients with AECOPD combined with respiratory failure and compared with those in 30 cases without respiratory failure. A total of 30 cases with AECOPD combined with respiratory failure were randomly divided into treatment and control groups. The two groups received conventional treatment. The treatment group also received LMWH injections every 12 h for 6 days and the clinical effect was observed. The levels of FIB, D-dimer, hematocrit, blood viscosity and plasma viscosity were significantly higher in the patients with AECOPD combined with respiratory failure compared with those in the patients without respiratory failure. The plasma D-dimer and FIB levels had significantly positive correlations with the partial pressure of CO2 (PaCO2) and negative correlations with the partial pressure of O2 (PaO2) in the patients with AECOPD combined with respiratory failure. The curative effect was improved in the treatment group, compared with that in the control group without side-effects. However, no significant changes in activated partial thromboplastin time (APTT) and international normalized ratio (INR) were observed between the treatment and control groups. The senile patients with AECOPD combined with respiratory failure suffered from hypercoagulation. Early detection and diagnosis of the prethrombotic state and timely treatment with LMWH may benefit these patients without side-effects.
