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Quantifi Photonics IQTX Manual

Coherent modulation transmitter
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Summary of Contents for Quantifi Photonics IQTX

  • Page 1 IQTX     Coherent Modulation   Transmitter EPIQ User Manual                   quantifiphotonics.com...
  • Page 2 Information provided by Quantifi Photonics is believed to be accurate and reliable. However, no responsibility is assumed by Quantifi Photonics for its use nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent rights of Quantifi Photonics.

  • Page 3: Table Of Contents

    5  Setting up hardware 5.1  Set up your IQTX product and power ON 5.2  Set up your IQTX for single polarization (IQTX 1100 Series models only) 5.3  Set up your IQTX for dual polarization 5.3.1  IQTX 1100 Series (Emulated Dual Polarization) 5.3.2  IQTX 1200 Series (Full Dual Polarization)
  • Page 4 9.2  LCD control touch-screen Graphical User Interface (GUI) 9.2.1  Main display 9.2.2  Setting laser channel parameter values 9.2.3  Toggling the laser channel on / off 9.2.4  Setting modulation channel parameters 4 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 5 10.3  Command summary 10.3.1  Common commands 10.3.2  System commands 10.3.3  Module commands 10.3.4  Configuration commands 10.4  Command descriptions 10.4.1  Common commands 10.4.2  System commands 10.4.3  Module commands 5 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 6 15  Working with electrical connectors 15.1  Connector care 15.2  Making a connection 15.3  Separating a connection 15.4  Using a torque wrench 15.5  Torque settings 16  System requirements 6 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 7 18  Technical Support 18.1  Contacting the Technical Support Group 18.2  Transportation 19  Warranty Information 19.1  General information 19.2  Liability 19.3  Exclusions 19.4  Certification 19.5  Service and repairs 7 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 8: What's In This User Manual

    SCPI commands: Controlling your LASER with SCPI commands Programming examples and applications Touchscreen: Operating the IQTX from the LCD interface Maintenance Upgrade firmware Restore factory settings 8 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 9: Conventions

    Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury or component damage. Do not proceed unless the required conditions are met and understood. NOTE Indicates relevant information that requires your attention. 9 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 10: Safety Information

    Do not install or terminate fibers while the light source is active.   Turn the Quantifi Photonics product OFF before inspecting the end face(s) of the product, or any optical patch cords connected to it.   Never look directly into a live fiber; ensure that your eyes are protected at all times.

  • Page 11: Electrostatic Discharge Precautions

    Store the unused product in the original protective electrostatic packaging that it was shipped in.   Use a wrist strap and grounding table mat when unpacking or handling the product. 11 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 12: Electromagnetic Compatibility

    If the LCD display is unavailable due to electromagnetic interference, please use the web-based graphical user interface CohesionUI to control, set or monitor the IQTX instrument. 12 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 13: Introducing The Iqrx - High Performance Coherent Optical Receiver

    This approach is widely used in R&D environments where there is no need to have independent data pattern on all four tributaries. The IQTX comes with a narrow linewidth, high-power, tunable internal laser, which can conveniently be controlled remotely from a PC using the web- based graphical user interface CohesionUI.

  • Page 14: Hardware Description

    AC power ~100-240V; 50/60Hz; 85W Max RF signal In-Phase input     RF signal Quadrature input     LCD touchscreen     Connector type information     14 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 15: Iqtx 1200 Series

    LCD touchscreen     Connector type information     NOTE You must use the IEC cable that has been supplied by Quantifi Photonics with the unit. 15 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 16: Environmental Conditions

    100-240V~, 50/60Hz, 85W Max Main supply voltage fluctuations ±10% Fuse specification 3.15A, 250VAC For fuse replacement, please adhere to the specifications provided in the table above. 16 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 17: Setting Up Hardware

    Always clean optical end faces before mating. NOTE   You must use the IEC cable that Quantifi Photonics supplies with the unit.     DO NOT attempt to remove or adjust any component of the product while the power is on. Ensure the product is powered OFF, and that the correct handling procedure detailed herein is followed when you remove or install any products.

  • Page 18: Set Up Your Iqtx Product And Power On

    5.1  Set up your IQTX product and power ON The RF signal connectors are used to input an RF generated pattern for optical transmission. Depending on the IQTX model, a single or dual polarization optical signal can be generated from the RF input signals.
  • Page 19  5. Power ON the instrument.  6. The IP address will appear on the LCD screen and in the web-based graphical user interface CohesionUI. If IQTX is connected via Ethernet and USB, both the USB and Ethernet IP address will be displayed. For details refer to section...

  • Page 20: Set Up Your Iqtx For Single Polarization (Iqtx 1100 Series Models Only)

    5.2  Set up your IQTX for single polarization (IQTX 1100 Series models only) NOTE   Ensure that the IQTX is ON before applying any RF signals to the RF signal inputs.   Ensure the input RF signal voltage remains below the specified 500 mV pk-pk.

  • Page 21: Set Up Your Iqtx For Dual Polarization

    5.3  Set up your IQTX for dual polarization IQTX models enable to generate dual polarization signals where the optical signal can be transmitted along two orthogonal polar planes in the optical fiber. However, the IQTX 1100 Series will only duplicate and delay modulated signals along both polarizations.

  • Page 22: Iqtx 1200 Series (Full Dual Polarization)

    5.3.2  IQTX 1200 Series (Full Dual Polarization) The IQTX 1200 Series instrument can generate optical signals from up to four independent RF channel sources. One channel pair from the RF input signals is modulated on the X-pol, the second pair is modulated on the Y-pol.

  • Page 23: Instrument Ip Address

      using CohesionUI Multi-instrument control If you have several Quantifi Photonics instruments with static IP addresses on your network, make sure to assign a unique IP address to each instrument before connecting. For details, refer to Controlling your IQTX with CohesionUI Operating the IQTX from the LCD interface.

  • Page 24: Installing Software

    6  Installing software To work with Quantifi Photonics MATRIQ and EPIQ instruments, you need to install the latest version of the Cohesion Operator software package on any computer that you use to connect with your instrument (client computer). The software package is included on the USB media device that we provide with your instrument, or you can download it from quantifiphotonics.com (go to Resources >...

  • Page 25: Install The Cohesion Operator Software Package

    The installation wizard will install required drivers, applications, and desktop icons on the computer. Multi-instrument control If another Quantifi Photonics instrument is already connected to the client computer via USB, make sure each instrument has a unique USB IP address to avoid any addressing conflicts.

  • Page 26: Check Firmware Version And Other Information

    To check details in Cohesion Operator:  1. Select the instrument.  2. Click Connect.  3. Current instrument information will be displayed. Installed Package refers to the currently loaded firmware version. 26 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 27: Upgrade Firmware

     6. Click Upgrade. The instrument will be upgraded to the selected firmware package. This can take a few minutes and the instrument might reboot several times 27 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 28 If an upgrade attempt is unsuccessful, the Cohesion Operator will stop the upgrade process and restore the instrument to its previous firmware version. Messages will be displayed accordingly.   28 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 29: Restore Factory Settings

    This will retrieve instrument information, with Installed Package showing the current firmware version.  4. Click Restore. The instrument will be returned to factory settings, including IP address settings. 29 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 30: Cohesionui - Overview

    7  CohesionUI - Overview CohesionUI is a web-based graphical interface that you can use to work with your Quantifi Photonics product. CohesionUI is part of the EPIQ firmware package running on your Quantifi Photonics instrument. From the menu on the left you can navigate to the following pages:  1.

  • Page 31: Access Instruments With Cohesionui

     2. Select the instrument by entering its IP address or by selecting it from the Discovery dropdown.  3. Click Open CohesionUI. CohesionUI will open in your standard browser. 31 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 32 To open CohesionUI in a browser:  1. Launch a supported browser.  2. Enter the instrument IP address in the address bar. CohesionUI will launch in the browser. 32 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 33: Set Values

     4. Click on a parameter and select a value from the dropdown menu.  5. Confirm the value. For details on how to change the step size, refer to Manage CohesionUI settings. 33 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 34: Set Values And Actual Values

    : The actual value of the parameter as queried by the product.   SET: The intended value of a given parameter as set by the user. 34 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 35: Manage Cohesionui Settings

    Please note that the units displayed on this page are not always relevant for each product.  3. Step size refers to the amount by which a value is increased or decreased when clicking the + or - button. 35 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 36 To adjust unit preferences one at a time:  1. Hover over SETTINGS.  2. Select a unit from the dropdown, for example the power unit. 36 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 37: Change The Instrument Ip Address

    You can change the instrument's static USB IP address, and assign a static Ethernet IP address if required. Multi-instrument control If you have several Quantifi Photonics instruments with static IP addresses on your network, make sure to assign a unique IP address to each instrument before connecting.
  • Page 38 To change the Ethernet IP address:  1. Connect with the instrument from a client computer via USB. Ensure that this the only Quantifi Photonics instrument currently connected via USB.  2. Open CohesionUI using the currently assigned USB IP address.  3. Go to SETTINGS.

  • Page 39: View System Information

     1. Refer to the top right corner in CohesionUI.  2. For more details, click INFO to display the information panel.  3. The information panel lists the instrument's serial number, and software and firmware versions. 39 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 40: Controlling Your Iqtx With Cohesionui

    8  Controlling your IQTX with CohesionUI You can use Quantifi Photonics' graphical user interface CohesionUI to work with your product. For details on how to get started with CohesionUI, refer to CohesionUI - Overview. The CohesionUI IQTX HOME screen displays the following:  1.

  • Page 41: Setting The Modulation Channels Mode

    8.1  Setting the modulation channels mode The IQTX modulation channels can operate in AUTO mode (default) or MANUAL mode. To set the mode for all modulation channels:  1. In the CONTROL tab, click GLOBAL MODE and select a mode. To set the mode for a selected modulation channel:  2.

  • Page 42: Setting The Modulation Channels Bias Values

    SET values and ACTUAL values 8.3  Output power value The global OUTPUT POWER of the IQTX instrument is displayed in the CONTROL tab on the top-middle ribbon of the screen. 42 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 43: Initiating A Dc-Bias Scan

     2. During the re-calibration process, the color strip under the bias label will turn orange. Once the unit has found the correct bias point, the color strip will turn green. 43 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 44: Setting The Laser Source Parameters

    In the CONTROL tab, you can set the following laser source parameters for a laser channel:  1. FREQUENCY (WAVELENGTH): The frequency (wavelength) of light for the IQTX to output. This corresponds to the spectral location of the central peak of the laser.

  • Page 45: Tuning The Laser Source

    Each GRID point is spaced apart by an equal amount, called the GRID spacing. The user can set this GRID spacing using the :SOURce<n>:CHANnel<m>:GRID/? command, between the values of 100 MHz and 50 GHz. 45 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 46: Frequency Tuning

    193.414489 THz 193.414 THz 193.414489 THz :SOUR2:CHAN1:FREQ 193.414489 THz 193.4144895 THz 193.414 THz 193.414489 THz :SOUR2:CHAN1:FREQ 193.4144895 THz 193.4000001 THz 193.400 THz 193.400000 THz :SOUR2:CHAN1:FREQ 193.4000001 THz 46 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 47: Frequency Fine Tuning

    GHz, meaning that between any two adjacent GRID points, there lies an 8 GHz region that is non-accessible. If tunability is a primary concern, it is suggested that the user set the GRID spacing to be <= 6 GHz. 47 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 48 48 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 49: Toggling The Laser On/Off

    8.7  Toggling the laser on/off In the CONTROL tab, you can toggle the laser in a specific channel of the IQTX ON or OFF by clicking the STATE button. 49 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 50: Setting The Dither Size

    The dither interval determines how frequently the bias control dither is applied. Lower dither interval will result in a faster convergence, while a higher dither interval will result in a more stable bias control. 50 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 51: Reviewing Modulator Bias Values Vs Time Error History Plots

    The polarization (X or Y) and the modulator biases (All, I, Q, P) can be selected and filtered by clicking the drop down lists above the plots area. 51 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 52 The plots can be zoomed to show a specific section of the analysis by clicking and dragging the desired area with the cursor. To reset the zoom, click the Autoscale button or double-click on the plot area. To download a plot as a PNG file, click the Download plot as a png button. 52 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 53 Clicking the FORCE CALIBRATE button will initiate a new DC bias scan. To clear the modulator’s error plots history, click the RESTART HISTORY button. 53 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 54: Reviewing Modulator Biases Power Vs Biases Voltage Plots

    The plots can be zoomed to show a specific section of the analysis by clicking and dragging the desired area with the cursor. To reset the zoom, click the Autoscale button or double-click on the plot area. To download a plot as a PNG file, click the ‘Download plot as a png’ button. 54 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 55: Operating The Iqtx From The Lcd Interface

    To power on the IQTX press the On / Off button; the button will become illuminated to verify the instrument is powered on. NOTE After powering on the IQTX, please wait at least 1 minute before attempting to communicate with the instrument. This will allow the IQTX enough time to finish boot procedures and initialize the communication server.

  • Page 56: Setting Laser Channel Parameter Values

    This step size is set in the STEP SIZE tab in the menu. This applies to the following parameters:   FREQUENCY (Wavelength): The desired frequency (wavelength) of light that the IQTX instrument should output. This corresponds to the spectral location of the central peak of the laser.  ...

  • Page 57: Toggling The Laser Channel On / Off

    To toggle the laser in a specific channel ON or OFF, click the ON / OFF toggle button. NOTE After toggling the laser channel from OFF to ON, the IQTX instrument will take up to 30 seconds to stabilize its power and frequency. 9.2.4  Setting modulation channel parameters Clicking the IQABC row in the main display will open the configuration panel of the modulation channels.

  • Page 58: Settings Menu

    9.2.5  Settings menu The settings menu is used to configure the IQTX instrument settings and unit preferences. These controls can be accessed by clicking the settings button on the right-hand bottom corner. 9.2.6  Navigation within the settings menu The up and down arrows are used to scroll the selections of the menu when there are more options than can be displayed.

  • Page 59: Ethernet Connectivity Configuration

    IP address, as there will be an addressing conflict. To save and apply the changes click the tick mark. 59 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 60: Abc Setup Settings

    To access the step size settings, click on the STEP SIZE tab in the menu. Step size refers to the amount by which the wavelength, power and additional values increase or decrease when the + or - button are clicked. 60 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 61: Lcd Calibration Reset

    To reset the LCD interface settings and calibration, click on the LCD CALIBRATION tab in the menu and select OK. Follow the instructions on the display to calibrate the LCD interface. 61 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 62: Controlling Your Laser With Scpi Commands

    [VALUE1] or [VALUE2] can be used, but not both. Some commands may have more than two choices available. This parameter can be omitted where the command has a default defined in the command description. 62 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 63: Index Addressing Of Modules (Slot, Source) And Units (Channel)

    For the commands that require index values: <n> is the module index of the specific module within the IQTX instrument, this is an integer > 0. <m> is the channel index of a specific channel, this is an integer, <1 to 6>.

  • Page 64: Status Byte Register

    The Event Status Bit (ESB) is set from the SESR and the SESR Mask Message Available (MAV) is set when there is data in the output queue 3, 2, 1, 0 (LSB) Not used 64 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 65: Status And Event Registers Diagram

    10.2.5  Status and event registers diagram 65 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 66: Command Summary

    :IDN? Query the module identification >> :OPC? Query the Operation Complete Status of the module >> :OPTions? Query the channels installed in the module Summary >> 66 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 67: Configuration Commands

    Set a reset of the error history >> :VPI? Query the DC scan VPi >> :SLOWfactor? Query the optimizer timing factor >> :SLOWfactor Set the optimizer timing factor 67 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 68 :FINE Set the fine tune laser output frequency >> :GRID? Query the grid spacing >> :GRID Set the grid spacing >> :TEMPerature? Query the laser temperature 68 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 69: Command Descriptions

      NOTE: Any commands sent to the module when :MODUle<slot>:OPC? is NOT equal 1, may not execute or return an error.   Example *OPC? -> 1 69 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 70 Execution Error – SCPI was unable to execute the given command.   Command Error – SCPI was unable to parse the given command, likely due to an incorrect command. 70 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 71 Command error   Command Execution Error   Device Dependent Error   Not used   Not used   0 (LSB) Operation Complete   Example   *ESE? -> 61 71 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 72   *TST? -> 18 Command Summary >> *RST Syntax >> *RST Description Reset instrument to default power-on settings   Parameters   Response   Example *RST   72 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 73: System Commands

    Query the number of modules installed in the instrument   Parameters   Response Returns the number of modules installed in the IQTX   Example   :SYSTem:MODU? -> 2 73 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 74: Module Commands

    Query the channels installed in the module   Parameters   Response A comma separated array, or a single integer value based on the arguments given   Example :MODU1:OPT? -> 1,1,1,1,1,1   74 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 75: Configuration Commands

    UNIT: Returns the BIAS measurement unit   Response Returns the string for the modulator DC bias voltage for the specified channel   Example   :ABC1:XI:BIAS? ALL -> -14.0000,14.0000,6.0000,-3.932 75 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 76 FULL: Returns all of the above parameters in a comma separated string   Response <wsp>: <starttime>,<endtime>   BIAS: <timestamp[1]+startTime>:<vbias[1]>   ERROR: <timestamp[1]+startTime>:<error[1]>   FULL: <timestamp[1]+startTime>:<vbias[1]>,<error[1]>   Example :ABC1:XI:HISTory? FULL -> 41000203.456:2.54,4.55   76 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 77 Response Depending on the parameters the response will be a single value or a comma separated string of values.   Example   :ABC1:XI:GAIN? SET -> 20.75 77 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 78 Query the dark nulling time remained to complete   Parameters UNIT: Get the dark nulling time remained to complete measurement unit   Response No response   Example   :ABC1:PDP:TIME? UNIT -> s 78 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 79   :ABC1:CAL COM Command :ABC<n>:HISTory:STARt Summary >> Syntax >> :ABC<n>:HISTory:STARt Description Set a reset of the error history   Parameters   Response   Example :ABC1:HIST:STAR   79 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 80 MAX: Set the maximum optimizer timing factor value of the modulation channel   DEF: Set the default optimizer timing factor value of the modulation channel   Response   Example   :ABC1:SLOWfactor MAX 80 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 81 ALL: Returns all of the above parameters   Response Returns the min, max, set or actual (current) power for the laser by parameters Example   :SOUR2:CHAN1:POW? SET -> 10.0 81 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 82 Returns the minimum, maximum or currently set value for the laser wavelength as specified by parameters. The lock parameter will return as TRUE or FALSE Example   :SOUR2:CHAN1:WAV? MAX -> 1.56877267e-06 82 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 83 Returns the minimum, maximum or currently set frequency for the laser as specified by parameters. The lock parameter will return as true or false Example   :SOUR2:CHAN1:FREQ? MAX -> 1.96250000e+14 83 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 84 <value and unit> is a valid numerical value which is in the range between the MIN and MAX response queried with the FREQuency? command, or found in the IQTX specifications, along with the measurement unit MIN: Set the minimum programmable value  ...
  • Page 85 Description Query the Whisper mode state of the laser   Parameters   Response Current Whisper mode state of the laser   Example   :SOUR2:CHAN1:WHIS? -> ON 85 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...
  • Page 86 Command :SOURce<n>:CHANnel[m]:TEMPerature? Summary >> Syntax >> :SOURce<n>:CHANnel[m]:TEMPerature? Description Query the laser temperature   Parameters   Response Numerical temperature in degrees Celsius Example :SOUR2:CHAN1:TEMP? -> 26.88   86 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 87: Programming Examples

    10.5  Programming examples The following is a simple example of how to control the IQTX instrument by using SCPI commands. See the previous section for specific details and extra parameters that the listed commands accept. We recommend that you use the *ESR? query after every command that is sent to the device. This enables you to debug unreceived or incorrect commands sent to the product.

  • Page 88: Scpi Command Console

    10.6  SCPI Command Console The SCPI Command Console enables you to communicate with Quantifi Photonics product via SCPI commands. You can easily test commands and verify their syntax. For available SCPI commands, refer to the user manual of the Quantifi Photonics product you are communicating with.
  • Page 89 2. To switch to another Quantifi Photonics device: Enter ip and press <ENTER>. Enter the IP address of the Quantifi Photonics product you would like to switch to and press <ENTER>. Confirm that you are communicating with the right product: Enter *idn? and press <ENTER>.
  • Page 90 The instrument executes the command, there will be no action response.  8. If you enter a command incorrectly, for example: *csl The instrument returns error code 17: IO write error. 90 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 91: Programming Examples And Applications

    In NI-MAX a RIO interface will show up, however there are no communication methods available or implemented on this interface. Quantifi Photonics products are ONLY accessible through the VISA TCPIP INSTR interface provided by the CohesionSCPI service installed on the system. 91 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 92: Setting Up Ni-Max Application

    11.1  Setting up NI-MAX application To communicate with any Quantifi Photonics product, the chassis / benchtop product must first be setup as a TCP/IP instrument.  1. After installing NI-MAX, launch the application. In the left side panel of the window, click the Devices and Interfaces option. A drop down of available instruments detected will show up.

  • Page 93: Setting Up Ni-Visa Application

     2. On the right-hand side panel, select Open VISA Test Panel. A new window will popup. Click the Input / Output button from the window menu. Valid chassis and module commands can be entered in, and their returns queried 93 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 94: Python® 2.7 Code Example

    11.3  Python® 2.7 code example The following example shows how to communicate with the Quantifi Photonics product using Python code. # You can get VXI11 from pip: # pip install python-vxi11==0.9 import vxi11 from vxi11.vxi11 import Vxi11Exception # replace this with the IP of your device ip = "127.0.0.1"...

  • Page 95: Matlab® Code Example

    11.4  MATLAB® code example To communicate with the Quantifi Photonics product in MATLAB® the installation of a VISA IO driver is required. These drivers enable the creation of the Interface Object for instrument communication. If developing locally on the PXIE Platform, then these will already be installed. However, if development is on a remotely connected system the VISA Libraries, e.g.

  • Page 96: Example: Qpsk Configuration Procedures

    12  Example: QPSK configuration procedures The various modulation adjustments on certain models of the IQTX are used to calibrate and configure the optical signal. This section provides detail on the calibration for the example QPSK hardware setups. 12.1  Set the laser frequency and power Make sure the laser frequency and power are set to the desired values.

  • Page 97: Iq Skew

    12.2.2  IQ skew To adjust the IQ skew within the IQTX modulator, the ‘ I & Q RF delay dial is adjusted to increase or decrease the delay of the RF quadrature input signal. Very small adjustments should be made.

  • Page 98: Modulator Adjustments

    Since the electrical to optical transfer function of optical modulators is typically non-linear, a 5% bias offset as measured in the optical domain may not necessarily correspond to a 5% error in bias voltage. 98 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 99: I & Q Optical Phase Offset

    The I & Q optical phase offset dial is used to set the phase offset, or phase difference (ΔΦ as seen in the figures below), between the in-phase and quadrature phase components of the optical output signal generated by the IQTX.
  • Page 100 For QPSK and QAM modulation formats, the ideal phase between the constellation points is 90°. The quadrature error is an average measurement taken over all the constellation points as shown in this equation: 100 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 101: Measurement Definitions

    The IQ RF imbalance is the ratio of the in-phase component versus the quadrature component of the constellation points. The ratio is represented as a percentage, so 10% IQ RF imbalance would mean that the in-phase component is 10% larger than the quadrature component. 101 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 102: Error Vector

    EVM as a percentage to make it independent of the average signal power, as shown in this equation: The phase error is the phase difference between the signal vector and the ideal reference vector, as shown here: 102 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 103: Working With Optical Fibers

    Always inspect fiber end faces for cleanliness using a fiber inspection probe before inserting them into a port.. If required, clean fibers and faces as detailed below. Quantifi Photonics is not responsible for damage or errors caused by bad fiber cleaning or handling. NOTE To avoid damaging ferrules or fiber faces due to mismatched connectors, always check ports and connector type information before inserting a connector.
  • Page 104 If your connector features a screw sleeve, tighten the connector to firmly maintain the fiber in place. Do not over-tighten, as this will dam- age the fiber and the port bulkhead. NOTE Failing to align and/or connect fiber-optic cables properly will result in significant signal loss and reflection. 104 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 105: Working With Electrical Connectors

    Carefully align the center axis of both devices. Push the connectors straight together so they can engage smoothly. The male center conductor pin must slip concentrically into the contact finger of the female connector. 105 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 106: Separating A Connection

    Hold the torque wrench lightly at the end of the handle, then apply force perpendicular to the torque wrench handle. Tighten until the “break” point of the torque wrench is reached. Do not push beyond initial break point 106 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 107: Torque Settings

    8 in-lb (90 N-cm) 2.92 mm 8 in-lb (90 N-cm) 3.5 mm 8 in-lb (90 N-cm) NMD 3.5 mm 8 in-lb (90 N-cm) 5 in-lb (56 N-cm) 107 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 108: System Requirements

    Microsoft Windows® 10 (64-bit) Quantifi Photonics MATRIQ / EPIQ instruments Google Chrome™ Supported browsers for working with CohesionUI Microsoft Edge® Recommended client computer operating system Microsoft Windows® 10 (64-bit) 108 / 113 Quantifi Photonics | IQTX EPIQ User Manual | Document version 2.00...

  • Page 109: Maintenance

    To ensure that the unit is performing within specification, we recommend it is re-calibrated every 12 months. All Quantifi Photonics products are calibrated during manufacture, and each product is shipped to the customer with a Calibration Certificate. On this certificate, the calibration date, as well as the next calibration due date are mentioned.

  • Page 110: Technical Support

    18  Technical Support 18.1  Contacting the Technical Support Group To obtain after-sales service or technical support for this product, contact Quantifi Photonics: support@quantifiphotonics.com To accelerate the process, please provide information such as the name and the serial number of the product (see the product identification label), as well as a description of your problem.

  • Page 111: Warranty Information

    Quantifi Photonics shall not be liable for damages resulting from improper usage, transportation or unauthorized modification of the product, its accompanying accessories and software. The external power supply that has been supplied by Quantifi Photonics with the unit can only be used with that unit, do not use it with any other product.

  • Page 112: Certification

    Quantifi Photonics. 19.4  Certification Quantifi Photonics certifies that this equipment met its published specifications at the time of shipment from the factory. 19.5  Service and repairs To send any equipment for service, repair or calibration please contact the Technical Support Group: support@quantifiphotonics.com.
  • Page 113 Measure. Solve.   Quantifi Photonics is transforming the world of photonics test and measurement. Our portfolio of optical and electrical test instruments is rapidly expanding to meet the needs of engineers and scientists around the globe. From enabling ground- breaking experiments to driving highly efficient production testing, you'll find us working with customers to solve complex problems with optimal solutions.

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