Active fiber¶
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class
ActiveFiber(length=0, core_radius=0, background_loss=0, core_na=0, spectroscopy=None, ion_number_density=0)¶ ActiveFiber describes a step-index single-mode fiber with active dopant ions. Currently, only uniform doping in the whole core area is supported. This class extends the FiberBase class by adding spectroscopic data: gain and emission spectra, upper state lifetime and doping concentration.
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classmethod
from_cross_section_files(length, absorption_cs_file=None, emission_cs_file=None, core_radius=0, upper_state_lifetime=0, ion_number_density=0, background_loss=0, core_na=0)¶ Parameters: - length (float) – Fiber length
- absorption_cs_file (str) – Name of the file containing absorption cross-section data
- emission_cs_file (str) – Name of the file containing emission cross-section data
- core_radius (float) – Core radius
- upper_state_lifetime (float) – Lifetime of the excited state
- ion_number_density (float) – Number density of the dopant ions (1/m^3)
- background_loss (float) – Linear loss of the core (1/m, NOT in dB/m)
- core_na (float) – Numerical aperture of the core
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__init__(length=0, core_radius=0, background_loss=0, core_na=0, spectroscopy=None, ion_number_density=0)¶ Parameters: - length (float) – Fiber length
- core_radius (float) – Core radius
- background_loss (float) – Linear loss of the core (1/m, NOT in dB/m)
- core_na (float) – Numerical aperture of the core
- spectroscopy (
Spectroscopy) – The spectroscopic properties of the fiber. - ion_number_density (float) – Number density of the dopant ions (1/m^3)
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saturation_parameter()¶ Returns the constant saturation parameter zeta defined in the Giles model.
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core_area()¶ Returns the core area of the fiber defined as pi*r**2, where r is the core radius.
Returns: Core area Return type: float
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nonlinear_effective_area(freq)¶ Returns the nonlinear effective area of the fundamental fiber mode with the given frequency. The method used is determined by the attribute self.effective_area_type.
Parameters: freq (float or numpy float array) – The frequency of the optical signal (Hz). Returns: The nonlinear effective area Return type: Same as argument type.
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classmethod