SMART PICKER SERIES EOM - optoscience.com · The EOM-monitor output needs to be connected to 50...

SMART PICKER SERIES EOM

for low-voltage electro-optical modulators

Manual

http://www.optoscience.com/

Manual SmartPicker EOM Rev. A ENG LaCoSys Sept 2017

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1 Introduction

To know this manual is essential for operating with the system. Please read it carefully and comply with the hints for safe work with the device.

It is our policy to constantly improve the design and specifications. Accordingly, the details represented here cannot be regarded as final and binding.

© Dissemination and copying of this manual are allowed on special request only.

All rights reserved for the case of patent or registered-design application.

More information is available at the manufacturer http://www.lacosys.com/ or at the responsible distributor.

Manufacturers address: LaCoSys GmbH Hans-Knöll-Straße 6 D-07745 Jena, Germany Phone: (+49) 3641 / 2241514 E-Mail: [email protected] Web: http://www.lacosys.com

Date: September 2017

http://www.lacosys.com/


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Content page

1 Introduction ................................................................................................................... 2

2 Safety informations ........................................................................................................ 4

2.1 General notes / Symbols ............................................................................................................... 4

2.2 Electric safety / Personnel protection insulation ............................................................................ 5

2.3 Laser safety / labeling ................................................................................................................... 6

2.4 Intended use ................................................................................................................................. 6

3 Description of the system ................................................................................................ 7

3.1 General ......................................................................................................................................... 8

3.2 RF-output (RF-OUT) ..................................................................................................................... 8

3.3 DC – output (DC-OUT) .................................................................................................................. 9

3.4 PD-MON ....................................................................................................................................... 9

3.5 Trigger input (TRIGGER-IN) ......................................................................................................... 10

3.6 Mains ........................................................................................................................................... 10

3.7 USB-Connection ........................................................................................................................... 10

3.8 EOM – monitor ............................................................................................................................ 10

4 Use of the device .......................................................................................................... 11

4.1 Unpacking and installation .......................................................................................................... 11

4.2 First steps .................................................................................................................................... 11

4.3 Installation of software drivers .................................................................................................... 12

4.4 Operation principle of the SmartPicker EOM ............................................................................... 12

4.5 Operation modes ......................................................................................................................... 12

4.6 Example 1: Adjustment of the division factor ............................................................................... 13 4.6.1 Example 2: Adjustment of the pulse width ................................................................................... 13 4.6.2 Example 3: Adjustment of the delay ............................................................................................. 13

4.7 Examples of the SmartPickers operation with pulsed and cw lasers ............................................ 14

4.8 LabView Test – Software ............................................................................................................. 15

5 Maintenance information .............................................................................................. 16

5.1 Warranty ..................................................................................................................................... 16

5.2 Maintenance ................................................................................................................................ 16

5.3 Service ......................................................................................................................................... 16

5.4 Transport ..................................................................................................................................... 17

5.5 Disposal ....................................................................................................................................... 17

6 Technical Data ............................................................................................................. 18

6.1 General data ................................................................................................................................ 18

6.2 Command syntax of SmartPicker EOM ....................................................................................... 19


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2 Safety information

2.1 General notes / Symbols

Please read the manual carefully before putting the device into operation.

For more information of if you have questions you can contact our service or web-site www.lacosys.com .

The device was designed and built according to the standard DIN EN 61010-1 (IEC 61010-1) "Safety requirements for electrical equipment for measurement, control and laboratory use".

The device complies with the European Directive 2004/108/EG "Electromagnetic compatibility".

The device is labelled with the - sign.

The device will be disposed according the guideline WEEE- 2002/96/EG.

Warning notes and symbols in this manual:

NOTE This symbol marks if special attention must be paid for a fact while using the device.

ATTENTION This symbol marks if danger for the user of the device may occur.

ATTENTION This symbol marks a danger for the device.

ATTENTION Laser-radiation may be emitted!

ATTENTION Electrostatic delicate components.

ATTENTION Please use appropriate safety precautions against electrostatic discharge (safety pack, antistatic wristband etc.)



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2.2 Electric safety / Personnel protection insulation

The device operates with dangerous voltages internally. Do not open the device or remove pars of the case. It is not allowed to work inside the case or at parts under dangerous voltage by the user.

The device must be used as delivered. Every modification voids warranty or liability.

All cables must be electrically insulated. The customer service or authorized staff is allowed to open the device only.

The IP code of the device is IP2X.

Please switch off the device if you do not intend to use it for a longer time.

ATTENTION Electrostatic charges on persons and objects may cause voltages up to 4000 V. They can discharge invisible. To prevent aging or damage it is important to use precautions against electrical charging.


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2.3 Laser safety / labeling

The device is designed for use with lasers. Please respect the signs and regulations of DIN EN 60825-1.

Kennzeichnungen und Vorschriften nach DIN EN 60825-1 gekennzeichnet.

Fig. 1 Identification label at the device

RoHS statement The device and all components comply with RoHS Directive 2011/65/EU (RoHS).

WEEE-sign (ElektroG) - Waste of Electrical and Electronic Equipment.

The device is labelled with the symbol

2.4 Intended use

The device is intended for driving of integrated-electrooptic waveguide modulators (EOM). The modulators must be provided with separate inputs for the RF (input impedance 50 Ω) and for bias (high-ohmic). The half wave voltage (Vπ) for both inputs must be lower than 5.5 V.

For use of the automatic operation point control the modulator must be provided with an optical, FC-connectorized monitoring fiber at the output. For this a fiber coupler can be used which guides a part of the output light (5 - 10 %) to the feed-back loop. Since an InGaAs-photodiode is built in the wavelength can be between 1000 nm and 1700 nm.

Please store the manual near to the device and accessible for all users. Furthermore, please take care that all necessary documents like laser safety regulations or country-specific safety regulations are present.


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3 Description of the system

Device name: Smart Picker EOM

Description: Pulse or pulse picker control unit for integrated-optical modulators

Fig. 2 Front panel

1 EOM-Monitor Output (SMA(f))

6 DC-OUT (SMA(f)) (not in picture)

2 Photodiode input (FC-receptacle)

3 Trigger input (SMA(f))

4 LED Power ON and Automatic

5 RF-OUT (SMA(f))

Fig. 3 Rear panel

1 Trigger Level Adjust 4 On/Off Switch (under Revision instead of LED)

2 USB-Connection

3 24VDC Input

7


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3.1 General

The SmartPicker is characterized by:

- Automatic working point stabilization - Build in photodiode - EOM-RF up to 5.5Vpp - EOM-DC OUT ±10V - Synchronize up to 200MHz - Stable EMC shielded aluminium case - Integrated USB port - Independent tunable RF- and DC-amplitudes - Automatic operation point stabilization (optical feed-back loop input) for drift compensation - Trigger-Level input down to 50mV - TTL monitor output - Variable delay in the range 0 ns ... 1 ms - Variable pulse width in the range 4 ns ... 1 ms

The device is intended for use as table top device. It must be used in horizontal position. Please protect it against shifting.

3.2 RF-output (RF-OUT)

Output

Connector: SMA(f) Voltage: 0…5.5 V amplitude (square wave) Current: ± 100 mA TRise / TFall: < 5 ns

An integrated-optical amplitude modulator (EOM) needs voltage pulses typically in the 3…5 V range for switching between the off and on states (half wave voltage, π-voltage, Vπ). The exact value is given in the data sheet of the EOM

The SmartPicker EOM is able to deliver voltage pulses of a settable amplitude in the range between 0…5.5 V which corresponds to the modulators half wave voltage.

The RF-output is optimized for an output impedance of 50 Ω. A mismatch may lead to output voltages up to -15…+15 V. Shortening the output may lead to irreparable device damage.

The RF-output is optimized for an output impedance of 50 Ω. For other output impedance values the voltages are not correct.

In manual operation, the RF- and DC-output voltages can be set by software commands. All parameters can be set. The parameters are written at the modulators data sheet.


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3.3 DC – output (DC-OUT)

Output

Connector: SMA(f) Voltage: -10…10 V DC Current: ±10 mA

The DC voltage for the modulators operation point setting (biasing) can be set in the -10…10 V range. The DC value may vary depending on the operation data of the EOM with time and with the specific data of the certain EOM.

The DC-output is optimized for a high-resistance load. For other loads, the voltages are not correct.

The SmartPicker EOM can deliver the DC voltage (bias) for operation point setting. The DC voltage can be either fixed or variable by use of a feed-back loop for automatic operation point control and optimization

The SmartPicker EOM can compensate a bias drift of the modulator. The initially set operation point will be kept automatically if the division factor is large enough after activation of the automatic mode.

For this an adequate optical signal level difference between the modulators on- and off-states is necessary.

The SmartPicker EOM varies the DC output voltage starting from an initially given operation point and measures and evaluates the resulting optical signal change at the optical input PD-MON. If a lower optical input signal in the modulators off-state is achieved this DC voltage is taken as new operation point and the DC voltage is varied further in this direction. If the optical input signal is higher than the initial value the change will not be taken and the previous operation point is used further.

Using this self-optimizing algorithm, a low optical signal level is held which corresponds to a high contrast ratio of the modulator output.

3.4 PD-MON

Input (optical)

Connector: FC-receptacle Optical input power: 0…10 mW Required fiber connector: FC Frequency: >1 GHz

The optical input is needed for automatic optimizing of the operation point. The signal is averaged and integrated by a low-pass filter. The value is measured and lowered or held at minimum if the automatic operation is activated.


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3.5 Trigger input (TRIGGER-IN)

Input

Connector: SMA(f) Voltage: TTL/LVTTL Frequency: < 100 MHz Input impedance: 50 Ω Minimum pulse width: 10 ns

A rising voltage edge at the Trigger input increases a counter until a software pre-set value is reached. Then a voltage pulse is emitted at the RF-output. The RF-output pulse will have the pulse width, delay and amplitude which was pre-set using the software. The counter will be set back and counts again following the next Trigger input pulses. The Trigger input pulses must be obtained by the laser pulses.

3.6 Mains

Input

Connector: DC-PLUG 2,5mm Voltage: 24VDC Current: 2 A max.

Use only the delivered power supply. The supplied mains cable with an IEC 60320 C13 connector or an identical one must be used. It can be custom- or country specific.

3.7 USB-Connection

Please use a standard USB A-B cable for connecting the device with a PC. The installation of the needed drivers takes place automatically in most cases. More details can be read in chapter 4.3.

3.8 EOM – monitor

Output

Connector: SMA(f) Voltage: TTL (0…5 V) Current: ±50 mA TRise / TFall: < 1 ns

The EOM-monitor output serves as synchronous output to the RF-OUT signal. It can be used for control purposes or to trigger subsequent devices. The EOM-monitor output needs to be connected to 50 Ohms to get the correct amplitude and to avoid reflections.


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4 Use of the device

4.1 Unpacking and installation

Please verify the packaging if it is damaged. Any damage must be announced to the carrier and the manufacturer after receipt. Please verify if the package is complete:

4.2 First steps

Connect the mains cable with the delivered power supply and connect the DC-Pug to the device.

Only use the delivered power supply!

Connect a USB A-B – cable with the device and your PC.

You may need administrator rights to install the necessary software drivers depending on the operating system.

The software driver installation proceeds automatically if Microsoft Windows 7 or higher is used. For more information please read chapter 4.3.

Fig. 4: Scheme of a set-up

A possible set-up of the SmartPicker EOM with a modulator is depicted in Fig. 4. Your set-up may differ from this. The oscilloscope is used for the visibility of the electrical pulses for modulator control. The Trigger Source may be a free-running TTL/LVTTL generator or a TTL/LVTTL signal source which runs synchronous to the laser pulses, respectively.

Description Number

SmartPicker tabletop device 1

Mains cable 1

Documentation (manual, usb-stick) 1

Power supply 1


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4.3 Installation of software drivers

A virtual COM-port driver is needed for the communication via USB. For systems of Microsoft Windows 7 or higher the driver installs automatically if the PC is connected with the Internet. To do this you must only connect the USB-cable. The driver installs automatically. It is not necessary to switch the SmartPicker EOM on. This process can take some time.

For all other systems the drivers must be downloaded from the website of the driver manufacturer: http://www.ftdichip.com/Drivers/VCP.htm . Please connect the USB cable after the drivers installation.

A new COM-port is displayed in the device manager of your system after successful installation.

You may need administrator rights to install the necessary software drivers on your PC depending on the operating system. Please contact your IT-service.

4.4 Operation principle of the SmartPicker EOM

The SmartPicker is controlled by software commands.

To use the SmartPicker you need a free USB port and a terminal program.

The settings in the terminal program are:

COM port: see the PC´s device manager Baud: 57600 Baud Number of Bits: 8 Stop-bit: 1 Parity: no Flow Control: no

A detailed description of the commands and values can be found in chapter 6.2.

4.5 Operation modes

Manual mode:

The values for the RF amplitude (Vπ) and DC-amplitude (bias) are set by software commands. All parameters can be set.

The operation point can be set in knowledge of Vπ and bias of the EOM. This operation point is fixed.

Automatic mode:

The automatic mode is recommended for long-time experiments or use with enhanced requirements on signal stability. The automatic mode uses a photodiode which must be fed by a part of the light which is emitted by the EOM thus creating a feed-back loop. Please contact the manufacturer of the EOM if an automatic drift compensation is necessary.

A photo diode is integrated in the device. Please respect its maximum optical power of 10 mW. Overload leads to damage of the photo diode.

The automatic mode will be activated by a software command and indicated by a LED at the front panel.


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Some software commands are blocked in automatic mode or the device does not react. These are the commands to set:

- Delay - Pulse width - DC – value (bias) - AC (RF) – value

4.6 Example 1: Adjustment of the division factor

The division factor defines after which number of Trigger pulses an output pulse will be emitted at RF-OUT. It can be adjusted by software command.

Input: "DIV" Answer of the device: "New divider value? [0..65535]:" Example for input value: "1234" Answer of the device: "new Divider: 1234"

Please note that every input must be finished with the character „ENTER” (ASCII 13).

4.6.1 Example 2: Adjustment of the pulse width

The pulse width defines the length of the RF-OUT pulse in ns. It can be adjusted between 4 and 1048575 ns in steps of 1 ns. The pulse width can be adjusted by software command. Input: "PWD" Answer of the device: "New pulse width value [4…1048575ns] Example for input value: "128" Answer of the device: "new pulse width value: 128"

Please note that the pulse width must be shorter than the period of the RF-OUT frequency

𝑝𝑢𝑙𝑠𝑒 𝑤𝑖𝑑𝑡ℎ < ( 𝑇𝑟𝑖𝑔𝑔𝑒𝑟 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦

𝑑𝑖𝑣𝑖𝑠𝑖𝑜𝑛 𝑓𝑎𝑐𝑡𝑜𝑟 )−1 !

4.6.2 Example 3: Adjustment of the delay

The delay defines the temporal difference between the TRIGGER-IN and the RF-OUT pulses. It can be adjusted in the range between 5 and 1048575 ns in steps of 1 ns. It is needed for pulsed systems especially and enables the exact gating of laser pulses. The delay can be adjusted by software command.

Input: "DLY"

Answer of the device: "New delay value[0…1048535ns] "

Example for input value: "128" Answer of the device: "new delay value: 128"


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Please note that the delay must be shorter than the period of the RF-OUT frequency

𝐷𝑒𝑙𝑎𝑦 < ( 𝑇𝑟𝑖𝑔𝑔𝑒𝑟 𝑓𝑟𝑒𝑞𝑢𝑒𝑛𝑐𝑦

𝑑𝑖𝑣𝑖𝑠𝑖𝑜𝑛 𝑓𝑎𝑐𝑡𝑜𝑟 )−1

All further input parameters are given in chapter 6.2.

4.7 Examples of the SmartPickers operation with pulsed and cw lasers

Various lasers can be used. In general, there must be distinguished between pulsed and cw lasers.

Please note the admissible maximum average and pulse power with respect to the EOM and the SmartPicker´s photo diode.


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New pulse sequences can be generated by extracting single pulses or pulse bursts from pulsed lasers. This is determined by the repetition rate of the signal source and the division factor.

Optical pulses of a distinct repetition rate and pulse width can be formed from CW laser light by use of an external trigger source.

The EOM´s operation principle and use is described in the EOM´s manual. Please contact our service if you need more information.

4.8 LabView Test – Software

The software is not content of the product. The software is a test software and not supported. If you have questions or remarks you can send us an email.

With the software you can easily vary the AC-Amplitude, DC- Value and the other available values.


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5 Maintenance information

5.1 Warranty

The device manufacturer guarantees that the device is free of material or production faults. Please tell us immediately if faults occurred.

There is no warranty if the fault is caused by natural wear (especially at wear parts) or incorrect use.

The device manufacturer is not liable for damages which are caused by incorrect use, negligence or interference at the device, especially by removal or exchange of device parts and the use of accessories of other manufacturers. The warranty expires in this case.

LaCoSys declines any liability for damages which are due to disregard of the safety information.

5.2 Maintenance

Please switch off the device and remove the mains cable before maintenance!

Please respect the cleaning instructions of the devices of other manufacturers which are used in combination with the SmartPicker.

• Don´t use cleaning powders, diluents or solvents like benzine or acetone because this might affect the devices surface.

• Cleaning should be done using a soft wet tissue and mild soap.

5.3 Service

Any service-, maintenance, adjustment and cleaning work must be done by the service or authorized staff.

Only authorized staff is allowed to open the device.


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5.4 Transport

Please respect the following hints for safe transport. The warranty expires at if they are disregarded!

The SmartPicker is sensitive against electrostatic discharge. The discharge if static electricity for example from the fingers can shorten the devices lifetime or damage it. Please use appropriate safety precautions against electrostatic discharge (grounding, antistatic wristband etc.)

Only use packing or wrapping materials which are appropriate for electrostatic sensitive devices. Please don´t use styrofoam or simple air cushion foils.

Please use the original package preferably.

5.5 Disposal

Defect devices must be disposed according the legal rules. Do not put it into the domestic waste.

The device manufacturer is obligated by law to withdraw defect devices.


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6 Technical Data

6.1 General data

Length x Width x Height 240 mm x 125 mm x 36 mm

Mass 1 kg

Mains 24 DC

Power consumption < 75 W

Maximum switch-on current < 1 A

Location of use Only for inside use

Protection class II

Degree of protection IP 20

Radio interference suppression DIN EN 55011 class A

Noise immunity EN 61000-6-2 (industrial environment)

Environmental conditions: Temperature range: Operation: Storage: Relative Humidity: Operation: Storage: Vertical height of use: Operation: Storage:

10 … 40 °C -10 ... 60 °C

80 % (non-condensing)

99 % (non-condensing) 3000 m 12000 m

Installation position Horizontal

Please visit our website www.lacosys.com . You will find more information about further models.



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6.2 Command syntax of SmartPicker EOM

The driver for the interface will be loaded and installed automatically from the support site of the operating system after connecting the device and the PC if the operating system is an actual one and if the internet connection is active. If this is not possible you can download the actual driver for your operation system here: http://www.ftdichip.com/FTDrivers.htm

Terminal program settings for communication via USB (emulated RS232):

COM port: see the PC´s device manager Baud: 57600 Baud Number of Bits: 8 Stop-bit: 1 Parity: no Flow Control: no

Delimiter of user:

[ENTER], „\r“ in ASCII or 13 Decimal

Delimiter of the system:

[ENTER], „\r“ in ASCII or 13 Decimal

Syntax in general:

„[Command][ENTER]“ every command/request must be terminated by the [ENTER] key.

If a value should be entered please enter the command first, terminate it with [ENTER], then enter the value and terminate it with [ENTER]

Example.:

„DCA[ENTER]“ „1200[ENTER]“ DCA (DC amplitude) is set to 1200mV

The command and value inputs will not be put out as echo.

In LONG Mode a text-based output is given to ease the observation of the devices operation.

In SHORT Mode no outputs following on control commands are generated. Only the values are generated. In the case of Status request an output of all system parameters separated by TABSTOPs is generated.

The delimiter is sent by the system after each output.

http://www.ftdichip.com/FTDrivers.htm


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USB (RS232) error messages: "UART Frame Error: "

"UART Overrun Error: "

"Buffer overflow error: "

Character string too long or invalid: "Command invalid" or "EE"

Values range exceeded: "out of range"

Unknown command: "unknown Command" or "EE"

Default settings: Divider 0

DCA 0

ACA 1000mV

Delay 0

Pulse width 100ns

Automatic mode 0


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COMMAND SYSTEM ANSWER IN LONG MODE ANSWER AFTER VALUE INPUT

remark

"LONG" "Long text mode active "

"SHORT"

"Short text mode active "

"DIV" "New divider value?[0..65535]:" "new Divider: [VALUE]"

"DCA"

"New DC-out value?

[-10000..10000mV]:"

"new DC-Out: [VALUE]"

"ACA" "New AC-out value?[0..5500mV]:" "new AC-Out: [VALUE]"

"SAVE"

"SAVE ALL TO EEPROM"

"DEFAULT"

"Default settings restored"

"DLY" "New delay value [0..1048575ns] ?:"

"new delay: [VALUE]"

"PWD" "New pulse width value

[5..1048575ns] ?:"

"new Pulse width: [VALUE]"

"?" Shows the command list (see „Help

text“ at the following page)

"STA"

Shows the system status (see

„STATUS“ at the following page)

"PDV"

"Photo current measurement running"

"Photocurrent is: [VALUE] uA"

"VER"

"EOM-Control-150 V1.1"

"AUTO"

"AUTOMATIC ON"

"MAN"

"AUTOMATIC OFF"

"???" "unknown command: " "EE" (SHORT)


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Help Text: ***************HELP FOR EOM CONTROL***************************

Syntax: Command [ENTER] answer from System then Value [ENTER]

Possible Commands:

DIV Divider for EOM frequency out [0...65535]

MAN For manual control enabled

AUT For automatic minimum control enabled

DCA Set output value for DC out [-10000...10000mV]

ACA Set output value for RF out [0...5500mV]

DLY Set value for delay [0..1048575ns]

PWD Set value for pulse width [0..1048575ns]

MIN Search the minimum signal-level for DC control voltage

PDV Get actual photo current from the photodiode

STA Get status information for the system

DEFAULT Restore the default settings

*************************************************************

STATUS (LONG)

***************STATUS FOR EOM CONTROL***************************

Divider:[VALUE]

DC out:[VALUE]mV

AC out:[VALUE]mV

Delay:[VALUE]ns

Pulsewidth:[VALUE]ns

Measurement Scale: [VALUE]

Automatic: [VALUE]

*************************************************************

STATUS (SHORT)

[division factor]\t[DC-value]\t[AC-value]\t[delay]\t[pulse width]\t[measurement scale]\t[automatic]\t


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