Balanced photodiode pair model. More...

Inherits unit.

Public Member Functions
function	BalancedPair_v1 (in param)
	Class constructor. More...

function	traverse (in obj, in in1, in in2)
	Traverse function. More...

function	checkDimensions (in obj, in N1, in N2)
	Make sure number of specified properties is reasonable.

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	R
	Responsivity (A/W)

Property	CMRR
	Common-mode rejection ratio (dB)

Property	f3dB
	3dB cutoff frequency (Hz)

Property	Rtherm
	thermal resistance (ohm)

Property	Pmax
	maximum input power (NOT USED)

Property	T
	Temperature (K)

Property	modeAdditionEnabled
	Flag to enable/disable incoherent addition of signals in different optical modes.

Property	nInputs
	Number of input arguments.

Property	nOutputs
	Number of output arguments.

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

Balanced photodiode pair model.

Balanced pair model. Includes responsivity, finite common-mode rejection ratio, 3dB bandwidth, thermal, and shot noise contributions.

Notes

Has a property for maximum input power, but signal clipping is not implemented.
Can be forced to emulate an array of balanced photodiodes for a dual- or multi-mode coherent receiver by setting modeAdditionEnabled to false. When this flag is true, all columns of a multimode signal will be summed incoherently, as in a real photodiode. When it's false, they are kept independent and the output will have as many columns as the input.

Definition at line 25 of file BalancedPair_v1.m.

Constructor & Destructor Documentation

function BalancedPair_v1::BalancedPair_v1 ( in param )

Class constructor.

Class constructor

Example:

BPDparam.R = 1;
BPDparam.CMRR = 50;
BPDparam.f3dB = 28e9;
BPDparam.Rtherm = 50;
BPD = BalancedPair_v1(BPDparam);

Parameters

param.R	Responsivity [A/W] [Default: 1]
param.f3dB	electrical 3dB bandwidth [Hz] [Default: 40G]
param.Rtherm	resistance for thermal noise calculation [ohm] [Default: 50]
param.CMRR	common-mode rejection ratio [dB][Default: inf]
param.T	Temperature [K][Default: 290]
param.modeAdditionEnabled	[flag] [Default: true]

Return values

BalancedPair object

function BalancedPair_v1::traverse	(	in	obj,
		in	in1,
		in	in2
	)

Traverse function.

Performs square-law detection on both input signals, then subtracts with finite CMRR, then adds noise, then low-pass filters.

Parameters

in1	input signal 1
in2	input signal 2

Return values

out	BPD output
results.Rmix	mixing ratio from CMRR calculation

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