Parameters represent these quantities in this code.

 Parameter     Quantity                   Unit

  (Laser)
 wl            Laser Wavelength           nm
 tfw           Pulse Width (FWHM)         ps
 Pm            Pulse Peak Power           mW
 GHz           Bit Rate                   Gbps
 ch            Chirp Parameter
 dnm           Wavelength Separation      nm

  (Fiber)
 s             Effective Core Area        micron2
 aa            Attenuation Rate           dB/km
 Sl            Dispersion Slope           ps/nm2/km
 Rt            Raman Shift                fs
 Dp            Fiber Dispersion           ps/nm/km
 dDp           Disp. Step                 ps/nm/km
 kd            Disp. Step Length          steps
 Dc            Disp. Compensation         ps/nm
 Nc            Disp. Comp. Period         spans
 n2            Kerr Coefficient           m2/W
 
  (Amplifier / Receiver)
 ka            Amplifier Spacing          steps
 NF            Noise Figure               dB
 fw            Filter Width               nm
 fm            Filter Squareness          Super Gauss.
 dAp           Gain Fluctuation           dB
 Rfil          Baseband Filter            /bit rate
 Rdec          Decision Slot              /slot time  
 Rthr          Decision Threshold         /peak power
  
 (Calculation)
 h             Distance Step Size         m
 dt            Time Step Size             ps
 NM            Bit Slot Size              slots
 kmax          Max. Distance              steps
 kw            Graphic Period             steps
 kgt           File Output Period         steps
 ym            Graphic Scale