The laser spectrum is recorded on an optical spectrum analyser with a span corresponding to the erbium gain band.
Designed OSP is composed of pre-amplifier with variable gain, band-pass filter, noise level detector, and output signal shaper.
We propose a novel passive band-pass filtering scheme to obtain a net gain in a band-competing system using a W-type fiber waveguide, slicing a shorter wavelength gain band out of a given stimulated emission cross-section.
The JO analysis predicted the asymmetry of Terbium sites, allowing the electric dipole transitions and from the JO intensity parameters, promising spectroscopic parameters – emission cross section, branching ratio, gain band width and gain coefficient of the material were calculated.
Thirdly, digital calibration technique is used to calibrate the gain errors due to capacitor mismatch, finite open-loop gain and finite gain band width (GBW) of residue amplifier and so on.
However, discrete Raman amplifiers have many attractive aspects over rare-earth-doped fiber amplifiers, such as an erbium-doped fiber amplifier (EDFA), including arbitrary gain band, better adjustability of gain shape, and better linearity.
Size and shape effects in electromagnetic response of quantum dots (QDs) such as depolarization shift of the exciton resonance and fine structure of the gain band are considered on the basis of a unified concept of light confinement.
