IntensityModulator_v1 Class Reference

Linear or Mach-Zehnder intensity modulator. More...

Inherits unit.

Public Member Functions
function	IntensityModulator_v1 (in param)
	Class constructor. More...
function	traverse (in obj, in drive, in laser)
	Traverse function. More...
Public Member Functions inherited from unit
virtual	traverse (in obj, in varargin)
	Main function call.
function	traverseNode (in obj)
	Set unique ID when creating a unit. More...
function	connectOutput (in obj, in uobj, in unitOutput, in nextUnitInput)
	Specify where signal should go next. More...
function	connectOutputs (in obj, in units, in destInputs)
	Specify where signal should go next. More...
function	writeInputBuffer (in obj, in sig, in inputId)
	write input buffer
function	horzcat (in varargin)
	horizontal concatenation
function	vertcat (in varargin)
	vertical concatenation
function	setparams (in obj, in params, in REQUIRED_PARAMS, in QUIET_PARAMS)
	set parameters More...
function	view (in obj)
	Show interactive GUI through unit_view-class.

Public Attributes
Property	Vpi
	Half wave voltage [V].
Property	Vbias
Property	extinctionRatio
	Extinction ratio [dB].
Property	mode
	Operation mode.
Property	loss
	Insertion loss (excess) [dB].
Property	nInputs
	Number of inputs.
Property	nOutputs
	Number of outputs.
Public Attributes inherited from unit
Property	inputBuffer
	Buffer for storing inputs as we traverse the graph.
Property	nextNodes
	Children nodes.
Property	destInputs
	Destination inputs in children.
Property	results
	For storing results.
Property	label
Property	draw
	enable/disable plotting
Property	nInputs
	Number of signals traverse expects.
Property	nOutputs
	Number of outputs traverse expects.

Detailed Description

Linear or Mach-Zehnder intensity modulator.

Takes 2 signal_interfaces, applies modulation from signal interface 1 (drive) to signal interface 2 (laser). Runs in linear (ideal, non-physical) or mach-zehnder mode. Extinction ratio and insertion loss can be specified. Insertion loss is excess insertion loss from fiber coupling, splitters, etc. (i.e. the loss we'd see biasing at a maximum and with no drive signal). Drive-signal related loss is calculated by the object and stored in the results structure as inherentLoss.

Example:

param.laser.Power = pwr(150, {14, 'dBm'});
param.laser.linewidth = 100;
param.laser.Fs = 160e9;
param.laser.Rs = 1e9;
param.laser.Fc = const.c/1550*1e-9;
param.laser.Lnoise = 2^8;
param.im.Vpi = 6;
param.im.loss = 1;
param.drive.Fs = 160e9;
param.drive.Rs = 1e9;
param.drive.Fc = 0;

%% Linear region MZM
param.im.mode = 'MZM';
param.im.Vbias = -3;
driveAmp = 0.5/2*param.im.Vpi;

laser = Laser_v1(param.laser);
laserSig = laser.traverse();

t = genTimeAxisSig(laserSig);
driveField = driveAmp*sin(2*pi*param.drive.Rs*t);
driveSig = signal_interface(driveField, param.drive);
driveSig = driveSig.set('P', pwr(30, driveSig.P.Ptot));
im = IntensityModulator_v1(param.im);

laserModulated = im.traverse(driveSig, laserSig);

References:

• [1] Seimetz, High-order modulation for optical fiber transmission

Author

Molly Piels

Simone Gaiarin

Version

1

Definition at line 57 of file IntensityModulator_v1.m.

Constructor & Destructor Documentation

function IntensityModulator_v1::IntensityModulator_v1

(

in

param

)

Class constructor.

Constructs an object of type IntensityModulator_v1.

Parameters

param.Vpi	Half-wave voltage [V].
param.Vbias	Voltage used to set the working region of the modulator [Default: -Vpi/2]
param.mode	Operation mode. Possible values 'linear' (slope = 1/Vpi), 'MZM' (Mach zehnder)
param.loss	Loss [dB].
param.extinctionRatio	Extinction ratio ER = Pmax/Pmin [dB].

Member Function Documentation

function IntensityModulator_v1::traverse	(	in	obj,
		in	drive,
		in	laser
	)

Traverse function.

Takes 2 signal_interfaces, applies modulation from signal interface 1 (drive) to signal interface 2 (laser).

Parameters

param.drive	Modulating signal (real, single column).
param.laser	Laser (single polarization).

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The documentation for this class was generated from the following file:

• library/tx/IntensityModulator_v1.m