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Quantifi Photonics IQTX 1100 Series User Manual

Coherent modulation transmitter
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  • 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

    Cleaning and connecting optical fibers ......................... 14 6 Setting up IQTX and powering ON ................15 Setting up IQTX and powering ON ........................... 15 Setting up IQTX for single polarization (IQTX 1100 Series models only) ..........16 Setting up IQTX for dual polarization ........................17 6.3.1 IQTX 1100 Series (Emulated Dual Polarization) ...................
  • Page 4 Status and event registers ............................46 11.2.1 Standard Event Status Register ......................46 11.2.2 Standard Event Status Enable Register (Mask) ................46 11.2.3 Status Byte Register ............................ 46 11.2.4 Service Request Enable Register (Mask) ................... 46 Quantifi Photonics Ltd. Version 1.04...
  • Page 5 16 Technical support ......................73 Contacting the Technical Support Group ......................73 Transportation .................................. 73 17 Warranty ..........................74 General information ............................... 74 Liability ....................................74 Exclusions .................................... 74 Certification ..................................74 Service and repairs ................................ 74 Quantifi Photonics Ltd. Version 1.04...

  • Page 6: Conventions

    Do not proceed unless the required conditions are met and understood. Refers to information about this product that you should not overlook. Indicates some information that requires your attention or some extra information for the current topic. Quantifi Photonics Ltd. Version 1.04...

  • Page 7: Safety Information

    Ensure that a wrist strap and grounding table mat is used when unpacking or handling the IQTX instrument. Proper grounding and ESD management practices should always be followed to ensure that no ESD damage is caused to the IQTX instrument. Quantifi Photonics Ltd. Version 1.04...

  • Page 8: Electromagnetic Compatibility

    • Wherever the symbol is printed on the unit, refer to the instructions provided in the device documentation for related safety information. Ensure that the required conditions are met and understood before using the product. Quantifi Photonics Ltd. Version 1.04...

  • Page 9: Introducing The Iqtx

    The internal laser is externally connectorized on the front panel for maximum flexibility. Users simply connect its output to the modulator input using a short PMF patch cord supplied with the instrument. This external connection allows you to use your own laser if preferred. IQTX 1100 Series overview & features Front panel Rear panel...

  • Page 10: Iqtx 1200 Series Overview & Features

    16 AC power ~100 - 240 V; 50/60 Hz; 70 W Max RF signal Y-Pol-I input RF signal Y-Pol-Q input LCD screen 10 Connector type information • You must use the IEC cable that has been supplied by Quantifi Photonics with the unit Quantifi Photonics Ltd. Version 1.04...

  • Page 11: Working With Electrical Connectors

    Coherent Modulation Transmitter | IQTX Working with electrical connectors Quantifi Photonics products are equipped with high-quality RF signal connectors. Connector care Although all connectors eventually wear, with proper technique you can maximize accuracy and repeatability of measurements, and the lifetime of coaxial connectors: •...

  • Page 12: 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. Quantifi Photonics Ltd. Version 1.04...

  • Page 13: Torque Settings

    2.4 mm 8 in-lb (90 N-cm) NMD 2.4 mm 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) Quantifi Photonics Ltd. Version 1.04...

  • Page 14: Working With Optical Fibers

    To ensure maximum power and to avoid erroneous readings always inspect fiber end faces. Make sure they are cleaned as detailed below before inserting into any port. Quantifi Photonics is not responsible for damage or errors caused by bad fiber cleaning or handling.

  • Page 15: Setting Up Iqtx And Powering On

    • You must use the IEC cable that has been supplied by Quantifi Photonics with the unit. Setting up IQTX and powering 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 16: Setting Up Iqtx For Single Polarization (Iqtx 1100 Series Models Only)

    After powering on, please wait at least 1 minute before attempting to communicate with IQTX. This gives IQTX time to finish boot procedures and initialize the communication server. Setting up IQTX for single polarization (IQTX 1100 Series models only) •...

  • Page 17: Setting Up Iqtx For Dual Polarization

    Setting up 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 18: Installing Software

    Installing Cohesion Operator software package on client computer(s) Set up any computer you use to connect with the instrument by installing the latest Cohesion Operator software package. Cohesion Operator enables you to connect with Quantifi Photonics instruments on your network and manage firmware upgrades.
  • Page 19 Coherent Modulation Transmitter | IQTX Quantifi Photonics Ltd. Version 1.04...

  • Page 20: Checking Instrument Firmware Versions And Other Product Information

    You can check the details of an instrument in Cohesion Operator or in CohesionUI. In Cohesion Operator: Select the instrument. Click Connect. Current instrument information will be displayed. In CohesionUI: Select INFO on the menu. Instrument information will be displayed in the info panel. Quantifi Photonics Ltd. Version 1.04...

  • Page 21: Upgrading An Instrument With The Latest Firmware

    To confirm the new firmware version, click Connect to retrieve the latest instrument information. 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. Quantifi Photonics Ltd. Version 1.04...

  • Page 22: Restoring Factory Settings On An Instrument

    Select the instrument by entering its IP address or by selecting it from the Discovery drop down list. (optional) Retrieve instrument information, including current firmware versions, by clicking Connect. Click Restore. IP address settings will also revert to factory settings. Quantifi Photonics Ltd. Version 1.04...

  • Page 23: Cohesionui - Overview

    When both Ethernet and USB cables are connected to the IQTX, the IP displayed on the LCD will alternate between the USB and Ethernet IP addresses. If needed, the IP address can be statically assigned to the Ethernet or USB connection (see section 0 Quantifi Photonics Ltd. Version 1.04...

  • Page 24: Home Page

    You can edit the step size in the SETTINGS menu (refer 8.5 Managing CohesionUI settings). To set a value to a pre-defined value, for example MIN, MAX or DEF: Click on a parameter and select a value from the dropdown menu. Confirm the value. Quantifi Photonics Ltd. Version 1.04...

  • Page 25: Set Values And Actual Values

    To view all settings and unit preferences and adjust as required: Click SETTINGS. Change settings or unit preferences as required, for example temperature units. Step size refers to the amount by which a value is increased or decreased when clicking the + or – button. Quantifi Photonics Ltd. Version 1.04...
  • Page 26 Coherent Modulation Transmitter | IQTX To adjust unit preferences one at a time: Hover over SETTINGS. Select a unit from the dropdown, for example the power unit. Quantifi Photonics Ltd. Version 1.04...

  • Page 27: Managing Network Settings

    LCD screen. 8.6.2 Setting the Ethernet IP address The default Ethernet IP addressing method is dynamic, as the DHCP will automatically assign the instrument an IP address. This address can be found on the LCD screen. Quantifi Photonics Ltd. Version 1.04...
  • Page 28 To test if the IP addressing has worked, power OFF the instrument, and disconnect the USB cable. Turn the unit back ON, and once it has finished booting, check the IP address shown on the LCD screen. Quantifi Photonics Ltd. Version...

  • Page 29: Info Panel

    Clicking the INFO button will display an information panel on the right-hand side of the page. Information such as the chassis operation mode, manufacturer, model, and serial number of the chassis, CohesionUI version number, and the version of CohesionSCPI service running on the chassis is displayed in this panel. Quantifi Photonics Ltd. Version 1.04...

  • Page 30: Operating Iqtx With Cohesionui

    In the CONTROL tab, click GLOBAL MODE and select a mode. To set the mode for a selected modulation channel: In the CONTROL tab, click MODE for a modulation channel and select a mode. GLOBAL MODE will change to CUSTOM. Quantifi Photonics Ltd. Version 1.04...

  • Page 31: Setting The Modulation Channels Bias Values

    Click FORCE CALIBRATE in the CONTROL tab or in the HISTORY tab. 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. Quantifi Photonics Ltd. Version 1.04...

  • Page 32: Setting The Laser Source Parameters

    Each laser source will have a MIN and MAX frequency value, which defines its operation range. For example, the lasers used in the IQTX 1100 Series have MIN and MAX frequency values of 191.1 THz (1527.605 nm) and 196.25 THz (1568.773 nm), respectively. If the user were then to set a GRID spacing of 1 GHz, then the frequency grid would be as shown in the below image.

  • Page 33: Frequency Tuning

    193.42501 THz 193.425 THz 193.425010 THz SOUR1:CHAN1:FREQ 193.42501 THz 193.414489 THz SOUR1:CHAN1:FREQ 193.414489 THz 193.414 THz 193.414489 THz 193.4144895 THz SOUR1:CHAN1:FREQ 193.4144895 THz 193.414 THz 193.414489 THz 193.4000001 THz 193.400 THz 193.400000 THz SOUR1:CHAN1:FREQ 193.4000001 THz Quantifi Photonics Ltd. Version 1.04...

  • Page 34: Frequency Fine Tuning

    In the example below, the GRID spacing has been set to 20 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. Quantifi Photonics Ltd. Version 1.04...

  • Page 35: Toggling The Laser On / Off

    Alternatively, the DITHER SIZE can also be set to the MIN and MAX value by clicking the dropdown in the name of the parameter. Increasing the dither size will lead to a more accurate bias optimization, but a larger dither will show up as an occasional perturbation to the bias voltage. Quantifi Photonics Ltd. Version 1.04...

  • Page 36: Setting The Dither Interval

    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. Quantifi Photonics Ltd. Version 1.04...

  • Page 37: Reviewing Modulator Bias Values Vs Time Error History 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. Quantifi Photonics Ltd. Version 1.04...

  • Page 38: 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. Quantifi Photonics Ltd. Version...
  • Page 39 Coherent Modulation Transmitter | IQTX To download a plot as a PNG file, click the ‘Download plot as a png’ button. Quantifi Photonics Ltd. Version 1.04...

  • Page 40: Operating Iqtx From The Lcd Interface

    • 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. • POWER: The desired output power of the IQTX instrument. Quantifi Photonics Ltd. Version 1.04...

  • Page 41: Toggling The Laser Channel On / Off

    In manual mode you can set the BIAS value for the channel. 10.2.5 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. Quantifi Photonics Ltd. Version 1.04...

  • Page 42: Navigation Within The Settings Menu

    When connected via USB, the default IP address is 192.168.101.201. This is a static address set during instrument calibration. If necessary, this address can be changed. Typing the default IP address in a supported web browser will open the CohesionUI page for the instrument. Quantifi Photonics Ltd. Version 1.04...

  • Page 43: 10.2.10 Abc Setup Settings

    10.2.13 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. Quantifi Photonics Ltd. Version 1.04...
  • Page 44 Coherent Modulation Transmitter | IQTX Quantifi Photonics Ltd. Version 1.04...

  • Page 45: Programming Guide

    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.

  • Page 46: Status And Event Registers

    SRE Mask to 0. The STB can then be queried and the value of the MSS can be used to determine the type of service request required based on the SRE Mask applied. The default bit values within the SESR Mask are all 0. Quantifi Photonics Ltd. Version 1.04...

  • Page 47: Common System Command Summary

    Common system command descriptions Command *IDN? Syntax *IDN? Description Query the chassis identification Parameters No parameters Comma separated string with the <manufacturer>,<server name>,<chassis Response controller name>,<server version> *IDN? -> Quantifi Photonics Ltd, IQTX-1203-FA-EPIQ,CSL-204102, Example HW0.00.00SW3.00.02 Quantifi Photonics Ltd. Version 1.04...
  • Page 48 Integer bit value for the register <0 to 255> Description Decimal Value 7 (MSB) Not used Not used Command Error Execution Error Device Dependent Error 8 Not used Not used 0 (LSB) Operation Complete Response No response Example *ESE 61 Quantifi Photonics Ltd. Version 1.04...
  • Page 49 Slot 3 Slot 2 Slot 1 0 (LSB) IQTX Any bits set to 1 indicate an error in that component. This command will return “0” if all components are working correctly. Example *TST? -> 18 Quantifi Photonics Ltd. Version 1.04...

  • Page 50: Specific Command Summary

    GRID point, with 1 MHz resolution :GRID/? - Set or query the grid spacing :WHISper/? - Set or query the Whisper mode state of the laser :TEMPerature? - Query the laser temperature Quantifi Photonics Ltd. Version 1.04...

  • Page 51: Specific Command Descriptions

    Parameters No parameters Comma separated string containing the <manufacturer>, <part number>, <serial Response number>,<hardware version><firmware version> :ABC:IDN? -> Quantifi Photonics Ltd, IQABC-1001-FA, CSL-000000, Example HW0.01.06FW0.00.05 Hardware and firmware versions are not separated by a comma Quantifi Photonics Ltd. Version...

  • Page 52: Configuration Commands

    Query whether the bias is locked to its optimal position Parameters INFO: Returns the string for the specified channel LOCK states Response is returned if the modulator channel is LOCKED is returned if the modulator channel is UNLOCKED Example :ABC:XI:LOCK? INFO -> 0:FALSE 1:TRUE Quantifi Photonics Ltd. Version 1.04...
  • Page 53 MIN: Set the minimum gain VPi percentage value of the modulation channel MAX: Set the maximum gain VPi percentage value of the modulation channel DEF: Set the default gain VPi percentage value of the modulation channel Response No response Example :ABC1:XI:GAIN SET 20.75 Quantifi Photonics Ltd. Version 1.04...
  • Page 54 Perform dark current nulling on the specified channel Parameters No parameters Response No response Example :ABC1:PDP:NULL Command :ABC:CALibrate Syntax :ABC:CALibrate[COMpleted] Description Forces recalibration of the auto-bias control system Parameters No parameters Response No response Example :ABC:CAL COM Quantifi Photonics Ltd. Version 1.04...
  • Page 55 ALL: Returns all of the above parameters in a comma separated string Response Depending on the parameters the response will be a single value or a comma separated string of values. Example :ABC1:SLOW? MAX -> 250 Quantifi Photonics Ltd. Version 1.04...
  • Page 56 WAVelength? command seen below, or found in the IQTX specifications MIN: Set the minimum programmable value MAX: Set the maximum programmable value DEF: Set the default programmable value Response No response Example :SOUR:CHAN1:WAV MIN Quantifi Photonics Ltd. Version 1.04...
  • Page 57 GHz to 6 GHz in 1 MHz increments as detailed in the specifications. MIN: Get the minimum programmable value MAX: Get the maximum programmable value DEF: Get the default programmable value Response No respponse Example :SOUR:CHAN1:FREQ:FINE MAX Quantifi Photonics Ltd. Version 1.04...
  • Page 58 OFF: Response No response Example :SOUR:CHAN1:WHIS ON Command :SOURce:CHANnel[m]:WHISper? Syntax :SOURce:CHANnel[m]:WHISper? Description Query the Whisper mode state of the laser Parameters No parameters Response Current Whisper mode state of the laser Example :SOUR:CHAN1:WHIS? -> ON Quantifi Photonics Ltd. Version 1.04...
  • Page 59 Coherent Modulation Transmitter | IQTX Command :SOURce:CHANnel[m]:TEMPerature? Syntax :SOURce:CHANnel[m]:TEMPerature? Description Get the laser temperature Parameters No parameters Response Numerical temperature in degrees Celsius Example :SOUR:CHAN1:TEMP? -> 26.88 Quantifi Photonics Ltd. Version 1.04...

  • Page 60: Scpi Command Console

    The SCPI Command Console enables you to communicate with Quantifi Photonics devices 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 device you are communicating with The two most common error codes are: 17: IO write error: the command was invalid or not accepted by the instrument.
  • Page 61 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 you are communicating with the right product: Enter *idn? and press <ENTER>.
  • Page 62 Example: Send a WRITE only command Enter a command correctly, for example: *cls The instrument executes the command, there will be no action response. Enter the command incorrectly: *csl The instrument returns error code 17: IO write error. Quantifi Photonics Ltd. Version 1.04...

  • Page 63: 12 Example: Control Of The Iqtx With Scpi

    Identifying the IQTX instrument and installed modules: Query to confirm the correct instrument is setup :*IDN? -> Quantifi Photonics Ltd,IQTX-1102-FA-EPIQ,QP-998877,HW0.00.01SW3.01.18 Query the available instrument module configuration :*OPT? -> IQABC,LASER Query the identification information for a specific slot module : MODUle2:IDN? ->...

  • Page 64: Ni-Max Application

    IQTX instrument via SCPI commands NI-MAX application To communicate with any Quantifi Photonics IQTX instrument, it 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.

  • Page 65: 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 commands can be entered in, and their returns queried. Quantifi Photonics Ltd. Version 1.04...

  • Page 66: Python® 2.7 Code Example

    "" print("writing a specific command") instrument.write(command) print("checking ESR") command "*ESR?" data = instrument.ask(command) print("*ESR?: " + data) except Vxi11Exception as e: # pass print("ERROR" + str(e) + ", command: " + str(command)) Quantifi Photonics Ltd. Version 1.04...

  • Page 67: Matlab® Code Example

    % Replace this with a valid command for your device (read the programming % guide section for examples) command = % Close the connection to the object. fclose(PXIE_Chassis); % Clean up all objects. delete(PXIE_Chassis); Quantifi Photonics Ltd. Version 1.04...

  • Page 68: Example: Qpsk Configuration Procedures

    The IQ skew is a measure of the time difference between the In-phase (I) and Quadrature (Q) crossing points in the eye diagrams as shown in section 13.3.1 Modulator bias-I and bias-Q. Quantifi Photonics Ltd. Version 1.04...

  • Page 69: 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 Δ voltage. Quantifi Photonics Ltd. Version 1.04...

  • Page 70: I & Q Optical Phase Offset

    Relationship 90° the constellation points is 90°. The quadrature error is an average measurement taken over all the constellation points as shown in Quadrature Error for QPSK Equation 3. Equation 2 - Quadrature Error Calculation Quantifi Photonics Ltd. Version 1.04...

  • Page 71: 14 Measurement Definitions

    The phase error is the phase difference between the signal vector and the ideal reference vector, as shown Equation 6. Equation 4 - Error Vector Magnitude Calculation Equation 5 - Phase Error Calculation Error Vector, Single Sample Point Quantifi Photonics Ltd. Version 1.04...

  • Page 72: 15 Maintenance

    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 73: 16 Technical Support

    16 Technical support Contacting the Technical Support Group To obtain after-sales service or technical support for this product, contact Quantifi Photonics. The Technical Support Group is available to take your calls from Monday to Friday, 9:00 a.m. to 5:00 p.m.

  • Page 74: 17 Warranty

    For full warranty terms and conditions, please visit www.quantifiphotonics.com. Liability Quantifi Photonics shall not be liable for damages resulting from the use of the product, nor shall be responsible for any failure in the performance of other items to which the product is connected or the operation of any system of which the product may be a part.
  • Page 75 1.04...

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Iqtx 1200 series

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