ID Photonics OMFT User Manual

Optical multi-format transmitter

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Optical Multi-Format

Transmitter

Transmitter Solutions

User Manual

P/N OMFT-x-0x-FA

x: Wildcard, applies to all instruments

Status: 2024-03-20

Applies to Firmware 2.3.4 or later

info@id-photonics.com www.id-photonics.com

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Page 1 Optical Multi-Format Transmitter Transmitter Solutions User Manual P/N OMFT-x-0x-FA x: Wildcard, applies to all instruments Status: 2024-03-20 Applies to Firmware 2.3.4 or later info@id-photonics.com www.id-photonics.com...
Page 2: Table Of Contents
Content General Information ................................3 Quick start ....................................9 Overview ....................................12 Hardware Setup .................................. 16 Tunable Laser Option ..............................23 Software ....................................24 Remote Control ................................. 33 Specifications ..................................53 Copyright ....................................57 Appendix ....................................53 OMFT Manual id-photonics.com...
Page 3: General Information
In the European Union, all equipment purchased from ID PHOTONICS can be returned for disposal at the end of its useful life. ID PHOTONICS will ensure that all waste equipment returned is reused, recycled, or disposed of in an environmentally friendly manner, and in compliance with all applicable national and international waste legislation.
Page 4 ID Photonics assumes no liability for the customer's failure to comply with these requirements. Before operation, review the instrument and manual for safety markings and instructions. You must follow these to ensure safe operation and to maintain the instrument in safe condition.
Page 5 Only factory authorized service personnel or other qualified service personnel may remove equipment covers for internal subassembly or component replacement or any internal adjustment. Do not install substitute parts or perform any unauthorized modification of the equipment or the warranty may be voided. OMFT Manual id-photonics.com...
Page 6 1.7.12.3 Output of Laser Radiation Warning This unit can contain an active source of laser radiation, if the option “internal laser source” is installed, that may cause harm to the eye. Please refer to section 1.7.12.6 for laser safety warning. OMFT Manual id-photonics.com...
Page 7 The use of optical instruments with this product will increase eye hazard. In doubt about laser safety requirements consult a trained laser safety instructor for local safety requirements of this product. OMFT Manual id-photonics.com...
Page 8 Important! Before connecting the inputs or outputs to any measurement equipment or device under test, make sure that a suitable attenuator, if necessary, is fitted. The maximum levels of each individual input/output are shown in section 8 OMFT Manual id-photonics.com...
Page 9: Quick Start
Insert power cord to power cord socket located at read side of the unit (6). Note: do not turn-on OMFT, before hardware setup is completed! Connect the optical input (2) of the Modulator to the laser output port (1) using the supplied PM Patch cord or an external laser source.
Page 10 Use RF cables with matching connectors. Refer to inspection report for connector type installed in actual sample. Switch on the OMFT using the switch located at the rear panel next to the power socket (6) Note: Turn-off any optical amplifier subsequent to the OMFT in case:...
Page 11 (Dropdown Files in upper right-hand corner) or by plugging in the USB connection which installs a Mass Storage device on the host PC (“USB Stick”). Switch on the RF signal source connected to the OMFT (the RF signal source is not part of this product) Enable the OMFT internal RF drivers by pressing “RF driver on/off”...
Page 12 RF drivers, Vpp differential = 250mV, Vpp single ended = 500mV for the RF signal source, the typical average output power of the OMFT should be in the range of -10 to -13dBm. 2.2 Access of WebGUI Connect the USB Port located at the rear of the unit to your Windows10 PC or connect the Ethernet Port to your LAN.
Page 13: Overview
Note that not all units have this information printed on. 3 Overview The Optical Multi-Format Transmitter (OMFT) enables modulation of single or multiple optical carriers with various modulation formats, such as polarization-division multiplexed quaternary phase-shift keying (PDM-QPSK) or 16-ary quadrature amplitude modulation (PDM 16-QAM).
Page 14 (DP- IQ modulator). If the OMFT is equipped with an optional internal laser source, this source can be used to generate an optical carrier.
Page 15 Local control and status information on the unit 3.5.2 Back Panel (6) Power cord socket, On/off switch 100 to 240 V, 50 to 60 Hz (7) Main fuse compartment one piece, 100 VA, 4A, slow (8) Fan outlets do not cover! OMFT Manual id-photonics.com...
Page 16 The incoming single polarization signal from a laser source is split into 2 parts and the polarization of 1 part is rotated orthogonally before routing them through 2 parallel of structures X and Y Polarization each handling 1 Polarization OMFT Manual id-photonics.com...
Page 17: Hardware Setup
Note: Do not turn-on the OMFT before the steps 4.2 to 4.6 are properly performed. 4.2 LAN or USB Cable for Remote Control The user can use both USB and Ethernet as interface for remote control of the OMFT with the provided GUI or using SCPI commands from self-built software.
Page 18 The default IP address is 192.168.0.1, DHCP off. If you plan to connect using the Ethernet interface, make sure the host PC is within the same subnet as the OMFT Ethernet Interface (The PC IP Address is 192.168.0.x then). The connectivity can be tested by opening a command shell (type “cmd”...
Page 19 Alternatively to the default IP Address shown above, enter “omft.local” or the IP address currently set to the unit. If in doubt, use the touch panel display “Device config” – “IP config” to retrieve the actual IP Address. Note that the must be a valid route on the IP layer between the device and the host PC (i.e. the ethernet port of the host PC is set to the same subnet as the device, for example 192.168.0.2) must...
Page 20 This instrument does not require any installation of software for operation. Once connected to a host PC or a local network, simply enter “omft.local” into the address field of your Web browser to access the unit. For more details, see section 7.2 and section 4.2.
Page 21 Permanent eye damage may occur! The laser output port (1) is an optional feature to the OMFT unit. The internal laser source provides a narrow line width tunable source suitable for coherent transmission. A virtual red status LED in the touch panel GUI indicates the laser on/off state.
Page 22 After steps 4.1 to 4.6 are performed, the OMFT can be started by pressing the main power-on switch located at the rear panel of the unit. Wait for approximately 1 minute until the OMFT device has booted and ready which is indicated on the touch panel display.
Page 23: Tunable Laser Option
These fast changes in combination with optical amplifiers such as EDFAs (Erbium-doped fiber amplifiers) might cause optical transients or surges which can damage any equipment connected to the optical output path of the OMFT. Note: Turn-off any optical amplifier subsequent to the OMFT in case...
Page 24: Software
6 Software 6.1 Local Touch Panel Based User Interface (Touch GUI) 6.1.1 Main Screen This Screen is partitioned into several areas controlling the building blocks of the unit (See also section - for details of the building blocks). OMFT Manual id-photonics.com...
Page 25 This will open up a pop up with a slider of which the setting is immediately transferred to the hardware. “Link Values” will apply the same setting of the current channel to all other channels. Click on OMFT Manual id-photonics.com...
Page 26 This will open up a pop up allowing to change the setting. This will be applied immediately upon input. Use the arrows to cycle to the next electrode. Press ok to close the pop up. OMFT Manual id-photonics.com...
Page 27 10. Setup (Gears) allows to show and change system settings of the unit. See next section for details. 6.1.2 Setup Screen Pressing the “Gear” button in main screen opens a popup to access the setting of the unit. Frequency/Wavelength Mode allows toggling between system wide display of carrier wavelength or frequency. OMFT Manual id-photonics.com...
Page 28 The WebGUI can be accessed from any host device such as a PC that is either on the same Ethernet Network as the OMFT unit or is connected via Ethernet and supports the USB virtual Ethernet structure (i.e. Windows 10 devices).
Page 29 Remote Control Examples for Matlab, Python and LabView Manual S2P S-Parameter calibration files for the unit Inspection Report of the unit The same content is accessible via an automatic Mass storage mount (“USB Stick”) when connected via USB Port. OMFT Manual id-photonics.com...
Page 30 “ok” or pressing <enter> on a keyboard. Each setting is applied separately. The “Settings” button opens a popup allowing to change all parameters at once and allows to sync the IQMOD Calibration carrier frequency to the current setting of the laser. OMFT Manual id-photonics.com...
Page 31 See section 7 for details. Identify unit inhibits a blinking indicator on the local touch GUI that is controlled by the WebGUI. This allows identification of the actual unit in case multiple OMFT devices are located in the same network.
Page 32 The automated BIAS control is based on a finite state machine model. It can assume the following states MANUAL, TRACKING, TRACKING_PAUSE, INIT, INIT_PAUSE and FAULT. Please see below a state diagram including all possible state transition conditions. OMFT Manual id-photonics.com...
Page 33: Remote Control
This device operates using SCPI standard style commands which are ASCII based and allow easy communication and interpretation with the instrument. Refer to chapter “Board and Connector description” on how to establish communication to the ports available at the instrument. More detailed information on SCPI syntax can be found here: http://www.ivifoundation.org/docs/SCPI-99.PDF OMFT Manual id-photonics.com...
Page 34 2. Connections through HTTP Service (Port 80). In this case, the SCPI command is encapsulated in the following http request: http://<OMFT IP>/scpi/<SCPI-Command> A typical example is: http://omft.local/scpi/*idn? Which queries the identification string of the unit. The ASCII encoded response is identical to the session-based response.
Page 35 If the echo option is set (for details, see command list), the accordingly sent command is returned first. 7.3.7 Communication example Host sends: *idn?; unit response: IDP-OMFTV2 OMFT-C-00-FA, SN 19160001, F/W Ver 1.0.0(101), HW Ver 1.00; OMFT Manual id-photonics.com...
Page 36 This feature allows execution of commands protected in standard access level to avoid accidental change of important parameters or reboot and shutdown of the unit. See command description “[:SYStem:]PASSword“ for details on how to enable enhanced access. OMFT Manual id-photonics.com...
Page 37 Denotes the optional character “?” that is used if the command can also be used as a query. Example: Definition [:SYStem:]IPADDRess/? / “?” is used to query current IP Address of the device: IPADDR?; Usage of Colon see 7.3.4 Denominates a white space character <wsp> Integer value <INT> <REAL> Real value OMFT Manual id-photonics.com...
Page 38 Command VOLT 2,5.67 Response: ; 7.6 General SCPI Commands Example read Syntax Description *idn?; Query System Type and Software version IDP-OMFTV2 OMFT-C-00- *idn? FA, SN 19160001, F/W Ver 1.0.0(101), HW Ver 1.00 *opc; Query all pending commands executed *opc 1;"...
Page 39 Enables or disables if laser port on/off [:SYStem:]ENABleAUTO “0” or “1” status is saved and executed upon STArt/?<wsp>/ reboot. IDP-OMFTV2 OMFT-C- 00-FA, SN [:SYStem:]INFOrmatio 19160001, see *idn? For detailed description F/W Ver 1.0.0(101), HW Ver 1.00 configure DHCP Setting for Ethernet [:SYStem:]DHCP/?/<ws...
Page 40 Query alarm status of device, see Alarm xxxxx [:SYStem:]ALARm? code definition for details “INIT”; ”FAULT”, Query current state of OSA; see Alarm [:SYStem:]STATus? state for match ”READY”; ”OVERLOAD” Queries data in an error queue and [:SYSTem:]ERRor[:NEX deletes it from the queue. OMFT Manual id-photonics.com...
Page 41 Query chassis configuration. The response returns the chassis type (CBDX1, CBDX, CBMX) and lists the installed slots and corresponding [:SYStem:]LAYout? number of lasers. Example: lay? Response: CBDX,1,1,TLS1; OMFT Manual id-photonics.com...
Page 42 "TRACKING" "TRACKING PAUSE", Query current state of BIAS Control [:SYStem:]CSTATus? "INIT", "INIT_PAUS E", "MANUAL", "FAULT" The unit operates on a LINUX System. [:SYStem:]SHUTDown Shut down the unit before power off using this command to avoid data loss. OMFT Manual id-photonics.com...
Page 43 <wsp>, / be all 6 BIAS Voltages without Channel ID. Example: VOLT?; 1.987, 5.365,8.487,6.456,11.567,15.734; See 7.5.1 for details on the parameter convention. Query if any BIAS Voltage is 5% or less to "0" or "1" [:BIAS:]STAtusVOLTage? maximum/minimum OMFT Manual id-photonics.com...
Page 44 /<wsp> 0: Signal within valid range" Note that this feature requires a valid power calibration of the feedback path. For OMFT, these values are calibrated at production. This sets the Loss of Signal (LOS) threshold of the unit. If the power at the feedback path drops below...
Page 45 7.8.2 Command Property overview 7.8.2.1 System Session based parameters/commands will be initialized to default each time a new connection/session is opened to the instrument. Syntax Read User Session Default Stored access based Write value level STADEF =0 [:SYStem:]ECHO/?/<wsp> [:SYStem:]STArtDEFault /?<wsp>/ OMFT Manual id-photonics.com...
Page 46 Write value level STADEF =0 [:SYStem:]DEFAULT [:SYStem:]INFOrmation? [:SYStem:]DHCP/?/<wsp> 192.168.0. [:SYStem:]IPADDRess/?/<wsp> 255.255.2 [:SYStem:]NETMASK/?/<wsp> 55.0 [:SYStem:]GATEWAYIP/?/<wsp> 192.168.0. [:SYStem:]MACADDRESS? [:SYStem:]IPConfigDEFault [:SYSTem:]INTerfaceInit [:SYStem:]REMOte? [:SYStem:]PASSword/?/<wsp> [:SYStem:]TIME/?/<wsp> R/(W) [:SYStem:]ALARm? [:SYStem:]CSTATus? [:SYSTem:]ERRor[:NEXT]? [:SYSTem:COMMunicate:]LOCKo ut/? [:SYSTem:COMMunicate:]Param eterREFresh? [:STATus:OPERation:]EVENt? [:]ABORt [:BOOT:]BootLoaDerRESet OMFT Manual id-photonics.com...
Page 47 /?<wsp>/ [:SYStem:]SetPASS<wsp>,, 7.8.2.2 BIAS Control Command Read Set in Manual User Stored Mode only access Write level SCSTAT [:BIAS:]AUToSTart/? / [:BIAS:]QuickSTArt/? / [:BIAS:]FACtoryDEFault [:BIAS:]SETTled? [:BIAS:]VPI/? /, / [:BIAS:]INIT/? / [:BIAS:]VOLTage/? /, / [:BIAS:]STAtusVOLTage? / [:BIAS:]CONTrol/? / OMFT Manual id-photonics.com...
Page 48 [:BIAS:]HWMAXRange? [BIAS:]TRackInLOS/? / [:BIAS:]FOFFset/? /, / [:BIAS:]FeedBackDIRection/? /, / [:BIAS:]CHannelACTive/? /, / [:BIAS:]CHannelASSign/? /, / 7.9 RF Amplifier Control Commands Command Parameter Type <INT> [:TransX:]AMPPeaking/?/<wsp>, Sets peaking level of Transmitter RF Amplifiers,: 0 … 100 <INT> [:TransX:]AMPGain/?/<wsp>, OMFT Manual id-photonics.com...
Page 49 Example: WAV:LIM?; queries Laser Port 1,1,1 Response with min and maximum limit: 1528,1565; <REAL>THz [:LASER:]FREQuency/?<wsp>,/ Sets or queries the wavelength setting of a tunable laser port. Value format is in Tera Hertz. Example: FREQ 192.15; sets Laser Port 1,1,1 to 192.15THz. OMFT Manual id-photonics.com...
Page 50 <REAL> [:LASER:]CONFiguration/?<wsp>,/ Set or Query current configuration of Laser in location C-S-D in csv format: <Frequency>,<Offset>,<Output Power>,<Output state>,<Busy state>,< Dither state>, Busy state : <INT> “1”,”0”, Only for query, if set is used, this parameter is omitted OMFT Manual id-photonics.com...
Page 51 Example: MON?; Returns 29.23,25.12,125.1,1043.2 7.11 SCPI Code error definition Error # Description Command Syntax Command error Parameter out of range No data in buffer device not ready user level for this command not sufficient Command execution error OMFT Manual id-photonics.com...
Page 52 If unit settled as required by user, the warning can be ignored. Feedback signal is too weak or not present. Check if Feedback Fail Feedback Photodiodes are connected properly. Not used Not used Not used Not used OMFT Manual id-photonics.com...
Page 53: Specifications
These settings are provided for reference for a standard setup to enable a quick start. For any further details on the AWG and this software, contact Keysight support. For this typical setup, we recommend the OMFT Gain settings of ~ 30% (Class40) or 70% (Class 60) and peaking between 0% and 50%.
Page 54 For single ended operation, make sure to properly terminate the unused RF Ports with 50 Ohm and double the output swing from the AWG to 500mV. RF- Cable 50 ohm Termination OMFT Reference Plane for S-paramters and skew Reference Settings for the free Keysight “IQ Tool” to generate a DP-QPSK Signal OMFT Manual id-photonics.com...
Page 55 NRZ-QPSK signals. Furthermore, it is assumed that the user has set up the OMFT with an output monitor coupler to record the optical output spectrum of the OMFT using a high-resolution optical spectrum analyzer (OSA) such as the ID Photonics ID OSA as well as a sampling oscilloscope (DCA) with a fast photo detector to view the optical envelope.
Page 56 (poor I/Q bias) (optimum I/Q bias) Figure 1: Optical spectrum for NRZ-QPSK at the output of the OMFT for poor (left) and optimum (right) setting of the I and Q modulator bias voltages. 9.2.2 Adjust the Bias Voltage for “X-Phase” and “Y-Phase” using the DCA On the DCA a picture similar to the one shown below should appear.
Page 57 Now adjust the delay between your electrical data source and the “X-Q”-input of the OMFT (e. g. by re-programming the respective output of your electrical data source or by using an electrical phase shifter between the source and the OMFT input) to move the characteristic point of the envelope to the center again.