def __call__(self, domain: Domain, ports: List[int],
fields: List[Field]) -> Tuple[List[int], List[Field]]:
output_fields: List[Field] = []
gain_in_bw_lin = cmath.sqrt(util.db_to_linear(self.gain_in_bw))
gain_out_bw_lin = cmath.sqrt(util.db_to_linear(self.gain_out_bw))
for field in fields:
# Pulse
for i in range(len(field)):
nu: np.ndarray = field.nu[i] - self.nu_offset
nu_gains = np.where((nu > (self.center_nu + self.nu_bw)) |
(nu < (self.center_nu - self.nu_bw)),
gain_out_bw_lin, gain_in_bw_lin)
nu_gains_shift = FFT.ifftshift(nu_gains)
field[i] = FFT.ifft(nu_gains_shift * FFT.fft(field[i]))
# Noise
if (self.NOISE):
gain_in_bw_lin_ = util.db_to_linear(self.gain_in_bw)
gain_out_bw_lin_ = util.db_to_linear(self.gain_out_bw)
nu_noise: np.ndarray = domain.noise_nu
nu_gains_ = np.where((nu_noise > (self.center_nu + self.nu_bw))
| (nu_noise <
(self.center_nu - self.nu_bw)),
gain_out_bw_lin_, gain_in_bw_lin_)
print(nu_gains_)
field.noise *= nu_gains_
output_fields.append(field)
return self.output_ports(ports), output_fields
def spectral_power(A, normalize=False):
r"""
Parameters
----------
A :
Pulse field envelope.
normalize :
If True, normalize the power array.
Returns
-------
:
The spectral power density of the pulse. :math:`[a.u.]`
Notes
-----
.. math:: P^\lambda(\lambda) = |\mathcal{F}\{A(t)\}|^2
"""
if (isinstance(A, List)):
res: List[np.ndarray] = []
for i in range(len(A)):
res.append(Field.spectral_power(A[i], normalize))
return res
else:
P: np.ndarray = np.zeros(A.shape)
if (A.ndim > 1): # multidimensional
for i in range(A.shape[0]):
P[i] = np.real(Field.sq_mod(FFT.fft(A[i])))
if (normalize):
P[i] /= np.amax(P[i])
P[i] = FFT.ifftshift(P[i])
else:
P = np.real(Field.sq_mod(FFT.fft(A))) # np.real to remove 0j
if (normalize):
P /= np.amax(P)
P = FFT.ifftshift(P)
return np.real(P) # np.real to remove 0j
def spectral_phase(A, unwrap=False):
r"""
Parameters
----------
A :
Pulse field envelope.
unwrap :
If True, unwrap the phase array (see numpy.unwrap).
Returns
-------
:
The spectral phase of the pulse.
Notes
-----
.. math:: \phi(\lambda) = Arg\big(\mathcal{F}\{A(t)\}\big)
"""
if (isinstance(A, List)):
res: List[np.ndarray] = []
for i in range(len(A)):
res.append(Field.spectral_phase(A[i], unwrap))
return res
else:
phase: np.ndarray = np.zeros(A.shape)
if (A.ndim > 1):
for i in range(A.shape[0]):
phase[i] = np.angle(FFT.fft(A[i]))
if (unwrap):
phase[i] = np.unwrap(phase[i])
phase[i] = FFT.ifftshift(phase[i])
else:
phase = np.angle(FFT.fft(A))
if (unwrap):
phase = np.unwrap(phase[i])
phase = FFT.ifftshift(phase)
return phase
def spectral_power(A, normalize=False):
if (isinstance(A, List)):
res = []
for i in range(len(A)):
res.append(Field.spectral_power(A[i], normalize))
return res
else:
P = np.zeros(A.shape)
if (A.ndim > 1): # multidimensional
for i in range(A.shape[0]):
P[i] = np.real(Field.sq_mod(FFT.fft(A[i])))
if (normalize):
P[i] /= np.amax(P[i])
P[i] = FFT.ifftshift(P[i])
else:
P = np.real(Field.sq_mod(FFT.fft(A))) # np.real to remove 0j
if (normalize):
P /= np.amax(P)
P = FFT.ifftshift(P)
return np.real(P) # np.real to remove 0j
def spectral_power(A: Array, normalize: bool = False):
if (A is not None):
if (A.ndim > 1): # multidimensional
P = np.zeros(A.shape)
for i in range(A.shape[0]):
P[i] = np.real(Field.sq_mod(FFT.fft(A[i])))
if (normalize):
P[i] /= np.amax(P[i])
P[i] = FFT.ifftshift(P[i])
else:
P = np.real(Field.sq_mod(FFT.fft(A))) # np.real to remove 0j
if (normalize):
P /= np.amax(P)
P = FFT.ifftshift(P)
return np.real(P) # np.real to remove 0j
else:
util.warning_terminal(
"Can not get spectral power of a "
"nonexistent field, request ignored, return null field")
return None
def set(self, waves: Array[cst.NPFT], h: float, z: float) -> None:
self._step = int(round(z / h))
self._call_counter += 1
# Set parameters -----------------------------------------------
if (self._sigma_e_mccumber):
omega = FFT.ifftshift(
self._omega) # could also change in abstract equation
for i in range(len(self._center_omega_s)):
self._sigma_e_s[i] = McCumber.calc_cross_section_emission(
self._sigma_a_s[i], omega, 0.0, self.N_0[self._step - 1],
self.N_1[self._step - 1], self._T)
for i in range(len(self._center_omega_p)):
self._sigma_e_p[i] = McCumber.calc_cross_section_emission(
self._sigma_a_p[i], omega, 0.0, self.N_0[self._step - 1],
self.N_1[self._step - 1], self._T)
# Add pump and signal power space step -------------------------
if (not self._iter): # first iteration
to_add_s = np.zeros((1, ) + self._shape_step_s)
to_add_p = np.zeros((1, ) + self._shape_step_p)
self._power_s_f = np.vstack((self._power_s_f, to_add_s))
self._power_s_b = np.vstack((to_add_s, self._power_s_b))
self._power_p_f = np.vstack((self._power_p_f, to_add_p))
self._power_p_b = np.vstack((to_add_p, self._power_p_b))
self._power_ase_f = np.vstack((self._power_ase_f, to_add_s))
self._power_ase_b = np.vstack((to_add_s, self._power_ase_b))
if (self._coprop): # First iteration forward
self._N_1 = np.hstack((self._N_1, [0.0]))
else: # First iteration backward -> self._forward is False
self._N_1 = np.hstack(([0.0], self._N_1))
self._step = 0 # construct backward array in bottom-up
# Set signal power ---------------------------------------------
# Truth table:
# if coprop : iter |forward| to do
# 0 | T | set pump
# 1 | F | set pump
# 2 | T | set pump & set signal
# if counterprop: iter|forward| to do
# 0 | T | set pump
# 1 | F | set pump & set signal
if (self._step_update):
if (self._forward):
if (self._signal_on):
self._power_s_f[self._step - 1] = self._get_power_s(waves)
self._power_p_f[self._step - 1] = self._get_power_p(waves)
else:
if (self._signal_on):
self._power_s_b[self._step + 1] = self._get_power_s(waves)
self._power_p_b[self._step + 1] = self._get_power_p(waves)
def __call__(self, domain: Domain, ports: List[int], fields: List[Field]
) -> Tuple[List[int], List[Field]]:
output_fields: List[Field] = []
for field in fields:
# Channels
for i in range(len(field)):
window = np.zeros(field[i].shape, dtype=complex)
window = FlatTopFilter.amplitude_transfer_function(field.nu[i],
self.center_nu, self.nu_bw, self.nu_offset)
window_shift = FFT.ifftshift(window)
field[i] = FFT.ifft(window_shift * FFT.fft(field[i]))
# Noise
if (self.NOISE):
field.noise *= FlatTopFilter.transfer_function(domain.noise_nu,
self.center_nu, self.nu_bw, self.nu_offset)
output_fields.append(field)
return self.output_ports(ports), output_fields