PolarizationBeamSplitterModel

class photonforge.PolarizationBeamSplitterModel(*, t1=(1, 0), t2=(0, 1), i=(0, 0), r0=(0, 0), r1=(0, 0), r2=(0, 0), ports=None)

Data model for a 3-port polarization beam splitter.

The S matrix, considering no mode mixing, is represented by:

\[\begin{split}S = \begin{bmatrix} r_0 & t_1 & t_2 \\ t_1 & r_1 & i \\ t_2 & i & r_2 \\ \end{bmatrix}\end{split}\]

The defaults assume that the 3 ports support up to 2 modes. More modes can be supported by extending the coefficients (see note below).

Parameters:

• t1 (complex | Sequence[complex] | Sequence[Sequence[complex]]) – Transmission coefficient to the first output port.

• t2 (complex | Sequence[complex] | Sequence[Sequence[complex]]) – Transmission coefficient to the second output port.

• i (complex | Sequence[complex] | Sequence[Sequence[complex]]) – Leakage (isolation) coefficient between outputs.

• r0 (complex | Sequence[complex] | Sequence[Sequence[complex]]) – Reflection coefficient for the input port.

• r1 (complex | Sequence[complex] | Sequence[Sequence[complex]]) – Reflection coefficient for the first output port.

• r2 (complex | Sequence[complex] | Sequence[Sequence[complex]]) – Reflection coefficient for the second output port.

• ports (Annotated[Sequence[str], maxItems=3, minItems=3] | None) – List of port names. If not set, the sorted list of port names from the component is used.

Notes

For multimode ports, a sequence of coefficients must be used, and mixed-mode coefficients are 0. Dispersion can be included in the model by setting the coefficients to a 2D array with shape (M, N), in which M is the number of modes, and N the length of the frequency sequence used in the S matrix computation.

Methods

black_box_component([port_spec, technology, ...])	Create a black-box component using this model for testing.
estimate_cost(*args, **kwargs)	Estimate the cost for S matrix computation.
s_matrix(component, frequencies[, ...])	Compute the S matrix for a component using this model.
setup_time_stepper(component, time_step[, ...])	Obtain a time stepper for a component using this model.
start(component, frequencies, **kwargs)	Start computing the S matrix response from a component.
update(*args, **kwargs)	Update this model.

Attributes

parametric_function	Function used to update a parametric component.
parametric_kwargs	Keyword arguments used to update a parametric component.
properties	Object properties.
random_variables	Random variables associated to this modles's parameters.
time_stepper	Time stepper associated with this model.

black_box_component(port_spec=None, technology=None, name=None)

Create a black-box component using this model for testing.

Parameters:

• port_spec (str | PortSpec | None) – Port specification used in the component. If None, look for "port_spec" in config.default_kwargs.

• technology (Technology | None) – Component technology. If None, the default technology is used.

• name (str | None) – Component name. If None a default is used.

Returns:

Component with ports and model.

Return type:

Component

start(component, frequencies, **kwargs)

Start computing the S matrix response from a component.

Parameters:

• component (Component) – Component from which to compute the S matrix.

• frequencies (Sequence[float]) – Sequence of frequencies at which to perform the computation.

• **kwargs (Any) – Unused.

Returns:

Model result with attributes status and s_matrix.

Return type:

SMatrix