Embedded Files
This file contains many parameters for the simulation software PHIsim_v3. The file is also read by the PHIsim_inputv3 program. It is a text based input file that can be edited using notepad or any other text file editor.
An example file is given below. The comments explain the meaning of the parameters. Most parameters describe the gain material and passive waveguide parameters and do not need to be changed often.
This page is to be extended with links from the example parameter file to pages with explanations of the meaning and role of the specific parameters
Some important parameters to take note of in this file are:
- The optical path length of one time segment. This is an integer number of central wavelength. This parameter determines the grid size and timestep in the simulation. So it also determines the meaning of the data in the optical signal input files.
- As an example: At 1500nm and with the speed of light in vacuum at 3x108 m/s and a group index of 3.7 the table below gives you the time step and physical length per segment.
- Number of cycles in the simulation (2nd line from the bottom). The maximum number of time steps is currently 4 million.
An example file with amplifier parameters for quantum well gain material at 1552nm is printed below. Each line is followed by comments in blue coloured text (that is not to be in an input file). More information on the meaning of the parameters and the gain model and relevant literature is presented on the Principles page. The file can be downloaded from the page Running PHIsim.
This page is to be extended with explanations of the input parameters. extend with links in the comments to more detailed
1.694e-19 # linear gain coefficient amplifier in m2
1.694e-19 # linear gain coefficient absorber in m2
0.053 # standard confinement factor amp
0.053 # standard confinement factor abs
0.75 # standard confinement factor passive waveguide active (wga) (checked, see "derivation of equations v3 passivewg.xmcd" and view_IMOS_mode.xmcd)
0.1 # confinement factor 2 photon absorption amp
0.1 # confinement factor 2 photon absorption abs
0.92 # confinement factor 2 photon absorption passive waveguide active (wga) (to be checked, see "derivation of equations v3 passivewg.xmcd")
0.08 # confinement factor Kerr effect amp (uncertain)
0.08 # confinement factor Kerr effect abs (uncertain)
0.6 # confinement factor Kerr effect wga (this value is also maybe 0.92?)
0.6577e24 # transparency carrier density m-3 for the amplifier + N_min_amp
0.6577e24 # transparency carrier density m-3 for the absorber + N_min_abs
0.0 # minimum carrier density m-3 in the amplifier
0.01e24 # minimum cariier density m-3 in the absorber
0.2 # amplifier non-linear gain coefficient espilon 1
0.2 # absorber non-linear gain coefficient epsilon 1
200.0 # amplifier two photon gain/abs coefficient epsilon 2
200.0 # absorber two photon gain/abs coefficient epsilon 2
3.7e-10 # two photon absorption coefficient amp m/W amplifier beta 2
3.7e-10 # two photon absorption coefficient abs m/W absorber
4.62e-10 # two photon absorption coefficient abs m/W passive wga
598e-12 # 598e carrier lifetime in the amplifier (sec)
15.0e-12 # carrier lifetime in the absorber (sec)
200.0e-12 # Carrier lifetime in a non contacted absorber isolation (sec)
100.0e-12 # Carrier lifetime in a passive waveguide (sec) (to be checked)
2.620e-16 # Bimolecular recombination coeff. m3 * sec-1
5.269e-41 # Auger recombination coef in m6 sec-1
5.07e-102 # Coefficient for N^5.5 drift coefficient
2.620e-16 # Bimolecular recombination coeff. m3 * sec-1 for the passive waveguide core
5.269e-41 # Auger recombination coef in m6 sec-1 for the passive waveguide core
1.552e-6 # wavelength in m
0.0265e-6 # active region hight Y direction (m) This value is consistent with the confinement, the ridge width and 500nm modeheight
2.0e-6 # active region width X direction (m)
-1345.0 # passive other losses in the amplifier 1/m (combined with the carrier dep term this leads to a loss value for > 1kA/cm2)
100.0 # passive other losses in the absorber 1/m
34.5 # passive other losses in the passive waveguide 1/m (=1.5dB/cm)
34.5 # passive other losses in the passive waveguide active in m-1
1.0 # Mode surface area factor for the passive waveguide active (e.g. to accomodate IMOS)
0.65 # Current injection efficiency
2.264e-21 # free carrier absorption coeficient in the SOA active region in m-1 per carrier per m3
-2.502e-46 # free carrier absorption in the SOA active region quadratic term m-1 per carrier per m3 squared
7.2e-21 # 3.0e-21 free carrier absorption coeficient in the passive waveguide active in m-1 per carrier per m3 - high value for hot carriers (Thourhout)
1.0e-4 # amplifier spontaneous emission coupling factor to laser mode beta
3.7 # Refractive index
-3.5e-16 # non linear refractive index n2 in the SOA
-1.5e-16 # non linear refractive index n2 in passive waveguide active (wga) (Dvorak et al value)
4.0 # carrier linewidth enhancement factor amp
4.0 # carrier linewidth enhancement factor abs
2.0 # carrier T linewidth enhancement fact amp
2.0 # carrier T linewidth enhancement fact abs
1.07e-26 # index change per free carrier per m3 in passive waveguide active (wga) (plasma effect and bandfilling, Weiming thesis )
20 # optical path length of one time segment in integer nr of central wavelength
15000 # Number of cycles in the simulation
PHIsimout.txt # output file name
-200 # if > 0 output data for video generated, store data for video every N time
100 # store the data for video from this cycle number
0 # if >=0 seed value for random number generation , -1 is random seed number for random number generation
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