Download EDFA

EDFA
Purpose:
Optical amplifier
Input Arguments:
optical input signal
Output Arguments:
optical output signal
Auxiliary Inputs:
wavelength
ASE-noise (PSD)
Auxiliary Outputs:
wavelength
ASE-noise (PSD)
Input Interface:
standard
single
total_field
multi-single
Output Interface:
standard
single
total_field
multi-single
Parameter:
Name
‘gain’
‘mode’
‘Psat’
Type
Number
Popup
Number
Description
small-signal gain in dB
constant gain or saturated gain
saturating output power in [dB]. This is the
value
fix/variable
f
f
f
‘nosie_figure’ Number
‘output’
Popup
‘enable ASE’
Boolean
‘fsample’
Number
‘ASE_modes’ Popup
for the output power, where the gain is 3dB
below
the small-signal gain
noise figure in dB
type of output interface
standard
single
total field
multi-single
1: enable ASE
0: disable ASE
sampling frequency in [Hz]
number of ASE modes
1
2
v
f
f
f
f
Description:
An erbium doped fiber amplifier (EDFA) is modeled by ideal or saturated gain and noise
figure. Two methods for the gain can be selected:
For the ideal case, the gain G equals the small-signal gain G0 for all input powers.
For the saturated case, the input power Pin is evaluated at the first loop, and the resulting
gain is derived from G0 and Psat by the following implicit formula:
G=G0e(1-G)ln(2)Pin/Psat
The input ASE-noise generated from preceding amplifiers, which is assumed to be white
and therefore determined by the constant power spectral density (PSD) NASEin, is
amplified by the gain and superimposed by the ASE noise NASEnew generated in this
EDFA:
NASEout = GNASEin + NASEnew
The constant PSD of the additional ASE is derived by
NASEnew = F/2 hfc(G-1)
where F is the noise figure, h is Boltzmann’s constant and fc is the optical carrier
frequency.
For the output interface, the standard interface or the same as the input interface are
allowed.
Signal is amplified by this module anyway. However, if parameter enable ASE is true,
the module will carry out the function of ASE converter which converts analytical ASEnoise into numerical representation.
Input and output arguments of ASE converter are both constant envelope signal.
Auxiliary inputs and outputs are wavelength and nase. Input interface and output
interface is in the type of single and total field. In addition, output interface can also be
standard.