For the thermal stability of mean wavelength of erbium-doped super-fluorescent fiber source (SFS), particularly, from a
different viewpoint, we analyzed the variation of spectrum of SFS at different temperature and wavelength range. Firstly,
the spectrum of a SFS at 10 °C is selected as a standard data (STDD), then at the different temperatures from -40 °C to
+60 °C (10 °C per step), the spectrums subtract the STDD for the spectral temperature dependent instability. It is found
that the variation of spectrum from short wavelength to long wavelength can be divided into three regions. In the middle
wavelength region from 1540nm to 1565nm, the dBm values of the spectrum are decreased with increasing temperature,
and with wavelength-flattened characteristics. On the other hand, at the short and long wavelength region, the dBm
values of the spectrum change inversely with temperature, and the variations are larger than that of the middle region.
Based on this characteristics, we design a new configuration of SFS, the mean-wavelength stability can be achieved
2.10ppm/mA and 1.75ppm/ °C in the range of pump current from 100mAto 250mA and in the range of temperature from
-40 to +60 °C, respectively.
By using the linear step effective index model (LSEIM), we analyze the chromatic dispersions (CDs) of high nonlinear
photonic crystal fibers (PCFs). The linear expression of the air filling fraction as a function of the relative air-hole size
is introduced for the cladding effective index. Then it is found that the LSEIM is an efficient method in high speed and
high precision. And this method demonstrated by experimental data can be widely used in not only larger relative air-hole
high nonlinear PCF, but also in the endlessly single mode PCF. Therefore, this research provides important
theoretical basis for the development and application of high-precision phase matching PCF.
We calculated the errors of Chromatic dispersion (CD) in PCFs, under different air filling fraction f, that is under
different refractive index difference ▵, by comparing the waveguide dispersion Dw between the formula of Dw, and that calculated from Deff the chromatic dispersion of effective index and the fiber core material dispersion Dm.
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