CoherentFrontend_v1 Class Reference

coherent front-end with polarization diversity More...

Inherits module.

Public Member Functions
function	CoherentFrontend_v1 (in param)
	Class constructor. More...
Public Member Functions inherited from module
function	module ()
	Create sink for internal output buffers.
function	view (in obj)
	Show biograph through module_view-class.
function	getOutput (in obj)
	Function to access module output for various intentions.
function	keepOutput (in obj)
	Function tells outputBuffer sink not to delete itself after traverse.
function	traverse (in obj, in varargin)
	Traverse function for modules. More...
Public Member Functions inherited from unit
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	nInputs
	Number of input arguments.
Property	nOutputs
	Number of output arguments.
Public Attributes inherited from module
Property	nInputs
	Number of input arguments (required)
Property	nOutputs
	Number of output arguments (required)
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.

Additional Inherited Members
Protected Member Functions inherited from module
function	exportModule (in obj, in varargin)
	Construct module. More...
function	connectInputs (in obj, in destInternalUnits, in destInternalInputs)
	Connect input signal to internal unit(s) More...
Protected Attributes inherited from module
Property	outputBuffer
	Where output signal is stored.

Detailed Description

coherent front-end with polarization diversity

Coherent front-end module. Consists of:

• local oscillator (Laser_v1)
• two PBS (PBS_1xN_v1)
• two optical hybrids (OpticalHybrid_v1)
• four balanced pairs (BalancedPair_v1) See relevant class files for model details.

The four outputs are, in order, I1, Q1, I2, Q2 The user can specify PBS parameters, but typically this would be done so that the outputs were Ix, Qx, Iy, Qy.

Note: PBS_v1 will assign a state of polarization to the LO - make sure it is something that makes sense (45 deg., not TE). The default should be 45, but if one signal is zero, this may be why. (PBS_v1 will also assign a SOP to the input signal if it is unpolarized. Again, you have to check this makes sense).

Relative to a real coherent front end, this implementation has one implementation difference. There is a splitter on the input that feeds the input signal to the LO. This is so that the signal length from the LO is the same length as the input signal.

Author

Molly Piels

Version

1

Definition at line 34 of file CoherentFrontend_v1.m.

Constructor & Destructor Documentation

function CoherentFrontend_v1::CoherentFrontend_v1

(

in

param

)

Class constructor.

Class constructor

Example:

%% Specify parameters
% LO has a center frequency 50 MHz above signal, 100kHz linewidth, and 5 dBm output power.
foffset = 50e6;
LOparam = struct('Power', pwr(150, {5, 'dBm'}), 'linewidth', 100e3, 'Fc', const.c/signal_wavelength+foffset);
% PBS is a standard TE/TM PBS with infinite ER.
PBSparam = struct('bases', eye(2), 'nOutputs', 2);
% Balanced pair(s) have 1A/W, 50dB CMRR, 36 GHz bandwidth
BPDparam = struct('R', 1, 'CMRR', 50, 'f3dB', 36e9, 'Rtherm', 50);
%% Rename parameters
param.LO = LOparam;
% align local oscillator to 45 degrees at input of PBS
param.LOPBS = catstruct(PBSparam, struct('align_in', [1 1]/sqrt(2)));
param.sigPBS = PBSparam;
param.hyb.phase_angle = pi/2;
param.bpd = BPDparam;
%% Construct object
CohFrontend = CoherentFrontend_v1(param)

Parameters

param.LO	local oscillator parameters
param.sigPBS	signal PBS paramters
param.LOPBS	local oscillator PBS paramters
param.hyb	optical hybrid parameters
param.bpd	balanced pair parameters

Return values

CoherentFrontend

object

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

• library/rx/CoherentFrontend_v1.m