Our work presents research of the optical Ge-Si glass composition doped with Er3+, Yb3+ ions and Bi optically active centers (BACs), which are useful for optically amplifiers for a double C- and U-band. The luminescence response in the 1500 – 1700 nm range was tested with various types of glass with different content of modifier and activators in the 1500 – 1700 nm range. The maxima of the luminescence intensity and the spectral full width were determined by modified reflex spectrum method measurement. The prepared Ge-Si glass doped with Er3+ ions and BACs exhibited strong and balanced emission in the 1520 – 1680 nm range after pumping at 1480 nm. The specific balanced optical differential gain of up to 0.2 dB/cm in the C-band and simultaneously 0.2 dB/cm in the U-band was measured. The measured results prove that the investigated germano-silicate glasses doped with Er3+ and Bi ions are promising for optical amplifiers working in the optical C- and U-bands.
This paper reports on the design of the surface enhanced Raman spectroscopy (SERS) structures that were optimized
through computation and simulation to obtain the best enhancement of the surface plasmon-polariton (SPP) response on
these structures. The structure of the silver nano-grating was designed, fabricated, optimized and measured. The
enhancement factor and the increase in the absorption capabilities associated with SPP were evaluated. The rigorous
coupled wave analysis (RCWA) and finite-difference time-domain (FDTD) computational/simulation methods were
utilized. The comparison between the computation simulation outputs and the measured outputs of the fabricated
samples was performed.
This paper summarizes the results of the gain transmission characteristics measurement carried out on the new ion
exchange Ag+ - Na+ optical Er3+ and Yb3+ doped active planar waveguides realized on a silica based glass substrates. The
results were used for optimization of the precursor concentration in the glass substrates. The gain measurements
were performed by the time domain method using a pulse generator, as well as broadband measurement method using
supercontinuum optical source in the wavelength domain. Both methods were compared and the results were graphically
processed. It has been confirmed that pulse method is useful as it provides a very accurate measurement of the gain -
pumping power characteristics for one wavelength. In the case of radiation spectral characteristics, our measurement
exactly determined the maximum gain wavelength bandwidth of the active waveguide. The spectral characteristics of
the pumped and unpumped waveguides were compared. The gain parameters of the reported silica-based glasses can be
compared with the phosphate-based parameters, typically used for optical active devices application.
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