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phase_shifter_thermal data file

Variable Type Description
mode_data

Cell

M x 1 cell array, where M is the number of modes. Each element of the cell is a struct with fields:

  • name: string with the name of the mode ('TE' or 'TM')
  • ID: integer to identify the mode, which should be 1 for 'TE' and 2 for 'TM'. These should be consistent across the entire CML.

Note: This model only supports a up to two modes.
wavelength_data

Number

 

Center wavelength (m) of the band for which the waveguide properties below are evaluated.
temperature_data

Temperature (K) for which the waveguide properties below are evaluated
neff

Matrix

 

 

 

M x 1 matrix with the effective index for the wavelength and modes specified above.
dneff_dT

M x 1 matrix with the effective index temperature sensitivity (1/K) of the waveguide.

Note: Thermal effects can be neglected by setting the values of this matrix to 0.
loss

M x 1 matrix with the loss (dB/m) for the wavelength and modes specified above.
ng

M x 1 matrix with the group index for the wavelength and modes specified above.
thermal_bandwidth

Number

3-dB cutoff frequency (Hz) of the thermal phase shifter.

Note: This model assumes that bandwidth is voltage independent.
phase_shifter_data

Cell

M x 1 cell array containing structs which describe the phase shift (rad) as a function of input power (W). Each element of the cell array is a struct containing the following fields:

  • power: C x 1 matrix containing the input power (W), where C is the number of power values measured.
  • delta_phase: C x 1 matrix containing the phase shift (rad) of the optical signal.

Notes:

  • Phase change should be provided at a wavelength corresponding to wavelength_data.
  • The number of bias points can vary from one mode to the next.
wg_length

Number

 

 

Default phase shifter length (m).

Note: This may be visible to the end user, depending on the configuration of the parameter .lsf file.
wg_length_min

Minimum phase shifter length (m).

Note: This may be visible to the end user, depending on the configuration of the parameter .lsf file.
wg_length_max

Maximum phase shifter length (m).

Note: This may be visible to the end user, depending on the configuration of the parameter .lsf file.

Electrical Behavior

The electrical behavior of the thermal phase shifter can either be modeled linearly via a resistance value, or non-linearly by providing an I-V characteristic. The IV data are linearly interpolated to obtain the electrical behavior.  Either one of the following values must be provided to enable modelling of electrical behavior.

Note: If IV data is provided, it will take preference over R_thermal_tuner data 

Variable Type Description
IV

Matrix

C x 2 matrix containing the current (Amp) versus bias voltage (V) characteristic of the heater for the default phase shifter length, where C is the number of bias points, and the columns contain:

  1. Bias voltage (V)
  2. Current (Amp)

Notes:

  • At least two bias points must be provided.
  • Bias voltage and current values must be positive.
  • These data will be used instead of a resistance value, if provided. 
  • The I*V values must fall within the range of power values provided in phase_shifter_data.
R

Number

Resistance (\(\Omega)\) of the heater for the default length of the phase shifter. 

Note: Using a linear model is suitable for resistive heaters, but for voltage-dependent models an IV characteristic should be used instead. 

Model Tuning & QA Data

This data is required for CML Compiler to run quality-assurance tests on the final model. It is also optionally used by CML Compiler to fine-tune the internal model to provide the expected behavior. For more information, see Tuning Active Compact Models .

Variable Type Description
IL

Struct

 

The total insertion loss (dB) of the thermal phase shifter at zero bias provided as a struct. The struct has the following fields:

default_value: M x 1 matrix containing the nominal insertion loss (dB), where M is the number of modes.

visible_to_user: Boolean flag to turn this FOM into a visible parameter for the CML user.

min: If the FOM is used as a parameter then the minimum allowed value in dB.

max: If the FOM is used as a parameter then the minimum allowed value in dB.

Note: Fields 'min' and 'max' are optional and must be provided only when 'visible_to_user' is set to 1 (true).
Ppi

Power (W) to achieve pi phase shift between Ppi_power1 and Ppi_power2, provided as a struct. The struct has the following fields:

default_value: M x 1 matrix containing the nominal Ppi, where M is the number of modes.

visible_to_user: Boolean flag to turn this FOM into a visible parameter for the CML user.

min: If the FOM is used as a parameter then the minimum allowed value in Watt.

max: If the FOM is used as a parameter then the minimum allowed value in Watt.

Note: Fields 'min' and 'max' are optional and must be provided only when 'visible_to_user' is set to 1 (true).
Ppi_power1

Matrix

 

 

 

M x 1 matrix containing the lower limit of the power (W) for which the Ppi values are valid, where M is the number of modes.
Ppi_power2

M x 1 matrix containing the upper limit of the power (W) for which the Ppi values are valid, where M is the number of modes.

Note: Ppi_power1 and Ppi_power2 values must be within the range of I*V values provided. 

Associated files

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