MiniRFE-1G Manual
Contents
1. View onto the APD side PCB HF FrontSide housing removed Element Name in Schematic Function AUX OUT BUI analog monitoring output AUX OUT BU2 analog monitoring output DIG OUT BU3 negative PECL out DIG OUT BU4 positive PECL out ILOS signaling BUS high 1V when a sufficient signal level is detected terminate into gt 10kR Offset Jumper J2 controls internal Offsets needs to be set to B left detector SEN1 InGaAs APD 200um diameter BEF1 4 screw connectors for GND to housing and uC PCB Typical Signals as seen on Oscilloscope Typical Output Signals with upper Pr 2uW and lower Pr 250nW datarate is 1 25Gbps with PRBS 27 1 all lines terminated into 50R upper channel positive analog out HF BU1 50mV in upper picture 20mV in lower second channel negative analog out HF BU2 50mV in upper picture 20mV in lower lower channel negative PECL out HF BU3 200mV in both pictures 7 12 Typical Performance Measurements of MiniRFE 1G All measurements with 1 25Gbps PRBS 2 1 wavelength 1550nm manual HW autamatic H P Rx nW Temp_APD C U_APD Y 103 162 297 646 103 103 162 297 zur 20r 646 040 2504 39 0 35 8 39 2 53 29 0 33 8 225 22 9 34 1 30 4 23 1 ER 24 0 alo 51 3 21 4 20 5 49 5 20 8 49 1 49 2 OOF Su 49 2 20 6 49 4 U_HV iV 96 6 50 4 59 2 Sl 54 6 26 5 26 02. wl VIALIGHT COMMUNICATIONS MiniRFE 1G Miniaturized High Sensitivity Optical InGaAs APD Receiver Frontend for Free Space Gigabit Ethernet Data Reception Manual ViaLight Communications GmbH Friedrichshafener StraBe 1 82205 Gilching Germany www vialight de Document content User manual technical description and performance measurements of four high sensitivity InGaAs APD receiver frontends with housing Change history V0 1 first version of this manual Content SUMMAary or Technical Da eeen E E i TOT 2 Functional Description or MiniRTR 1G na Eee 3 Getting Started ee ane eae 4 Interfaces and Controls uControler PCB 22222222222000seeeeeeeeeneennnnnnnnnnnnnnnnnnnnnnnnnennennnnn 5 terraces and Contos EI FEB nee aa 6 Typical sienai on the Oscilloscope nee ea A ET 7 Tp caL IC FIONA CG ee ee 8 Graphical User Interface ses 9 Roe ee er erlernen 10 BL UE TI Dawne Seesar a a a ee dias Satna tut ecaeae Ns 12 PANG See esse es 13 Summary of Technical Data Parameter Unit Value Condition Typical sensitivity mean Rx power nW 250 1 25Gbps BER 1E 6 PRBS 2 7 1 Typical minimum optical power nW 100 1 25Gbps BER 1E 3 PRBS 2 7 1 Maximum optical power uW 50 damage may occur above not tested InGaAs APD diameter um 200 usable wavelength um 1 1 7 use lowest possible supply voltage to avoid unnecessary Supply voltage V Dod heating of receiver mo
3. See 02 4 529 69 6 fa4 o4 4 APD uA Amp AUX my fd 3 9 13 8 20 0 St 3 0 BER 122 5 geo 2 0E 7 0 0E 0 2 0E 3 1 0E 3 T 0E 4 4 0E 1 0E 7 3 0E 0 0E 0 0 0E 0 0 0E 0 Graphical User Interface BE MiniRFE_GUI MiniRFE 1G GUI v1 0 Vialight Communications GmbH Serial Port coMs ww Open Close Mr 7 ya ee COMMUNICATIONS 4 Flags Measured Values Squelch Enabled Serial Port Open Auxiallary Output On Port Activity HV Enabled LAPD pA Automatic HV Control Signal Detected U_APD VW HV W High Voltage Control Manual Mode Only Temp C piy VCC 3 3 V CAYCA CaA Ca ea ea VCC 5 0 V U APD Set W ErrorCode code gt Screenshot of the Graphical User Interface for the MiniRFE 1G The Graphical User Interface can be used under Windows XP Vista 7 To install the GUI the supplied archive file must be extracted Subsequent to this step the GUI can be started by running the contained executable file Please note that also library files are supplied within the archive file Without these libraries the GUI might not be able to run The connection to a MiniRFE 1G can be initiated by selecting a proper Serial Port followed by a click on the Open Button All relevant functionalites of the MiniRFE 1G can be controlled via the GUI This includes e Flags Enable Disable Squelch Functionality Enable Disable Auxiliary Signal Output Ena
4. Supply 5 5V 7V Voltage Regulators 3 3V amp 5 0V Inter PCB Connector HV Source VCC33 Analog IN VCC50 gt U HV APD VCC3 3V Monitor digital Temp Sense digital Amp Control LOS Sense Squelch control HY VCC5 0V Monitor LOS Sense I APD Sense Analog OUT HV PROG U_APD U CM of Amp P_opt Ai aeo PECL Out Inter PCB Connector Limiter to HF PCB 1 25Gbps Digital OUT Squelch Control LOS LED RS232 Comm LED uC Okay LED UC ErrorCode LED Amp amp LowPass VCC33 VCC50 digital Temp Sense O digital Amp Control LOS Sense Ser Interfaces SPlto Amp DQ to Temp Sense RS232 to PC Squelch control HV toAPD High Frequency HF Board Diagram Microcontroller uC Board Diagram Impedance Amplifier 900MHz 2x diff Out 650MHz LOS AUX Out z Getting Started Stand Alone Mode mount device with APD in focus of the optical intensity modulated data signal connect HF BU1 to Oscilloscope terminate with 50R to observe analog signal quality connect HF BU4 to digital data receiver terminate with SOR connect HF BU5 to high impedance signal input to observe LOS state terminate all unused SMA plugs with SOR except for LOS out is high impedance connect 6V 500mA DC power supply to BU2 best to use laboratory power supply uC will boot and signal output starts after 1s LD
5. 3 blinks once per second with GUI Control execute all steps as described above connect RS232 Interface to a PC unpack all files of GUI z p into one directory and start GUl exe select correct RS232 port number in GUI press open check the description of the GUI Interfaces and Controls uController PCB uC goes tor 17891 View onto the rear PCB uC BackSide cover with the LED ports removed Element Name in Schematic Function voltage supply input 5 5V 7V typical 6V 400mA Power BU2 for connector type power supply plug e g Lumberg 1636 01 for plug with inner hole diameter 0 7 mm outer diameter 2 35mm RS232 interface BU4 connect to PC via custom RS232 Cable connector is type 4 wire Firewire pce De a a ar default nani aa Test Point 1 TP 1 measure APD HV here PGM connector STI connector to flash new uC Software RS232 data LD1 on when RS232 is sending data to PC LD2 uC error red LD3 uC alive signal LD4 on when LOS yellow LD5 power supply on green LD6 VCC 5 0V Okay green LD7 VCC 3 3V Okay green 5 screw holes make sure to connect the GND layer to the housing and to the HF PCB via the screws at the bottom of the PCB Interfaces and Controls High Frequency PCB HF o ST a fom O Seri i r is a shi mens Nas j un f l Ni l vi TE y a
6. am to directly access the MiniRFE 1G s parameters as this mode of operation allows the adjustment of parameters that were preset in the factory for optimum performance Programming wrong parameters can damage the APD through obvervoltage Do use the provided GUI instead The MiniRFE 1G has been optimized in a way that all specifications are guaranteed over the full temperature range and under normal operation conditions an adjustment of these parameters is not necessary Thus it is recommended to use the GUI for normal operation of the MiniRFE 1G 10 12 Housing 40 00 38 50 40mm BackSide MiddlePart FrontSide 11 12 Advices Remarks e The RFE is optimized for a data rate of 1 25Gbps Serial data between 125Mbps and 1 4Gbps can be received in general but at lower photons per bit sensitiviy The AUX Out amplitude does not rise linearly to the received power due to the current limiting HV supply circuit which protects the APD from photo current overload e Ifavailable the device should be used with a good quality laboratory power supply at 6V 450mA With a small wall power supply the sensitivity might decrease due to increased supply voltage ripple e terminate all unused signal outputs into SOR but not BUS which is high impedance and shall be left open when not used Abbreviations APD Avalanche Photo Diode HV High Voltage for APD HF _High Frequency PCB uC Micro Controller PCB uC Micro Cont
7. ble Disable High Voltage Module Automatic Manual Control of High Voltage High Voltage Control Manual Mode Only In case the MiniRFE 1G is operated in manual High Voltage Control Mode the High Voltage can be selected here e Status A green light indicates if the given value is activated or not e Measured Values A Number of values are displayed n this section U_APD V Voltage measured at the Avalanche Photodiode I APD wA Photocurrent of the Avalanche Photodiode HV V High Voltage at the Output of the High Voltage Generation Module Temp C APD Temperature in Degrees Celsius Vcc 3 3V V Current Status of 3 3V Supply Voltage Vcc 5 0V V Current Status of 5 0V Supply Voltage RS232 Cable Firewire Connector A Standard Firewire Connector is used on the PCB to connect the MiniRFE 1G via RS232 to a PC The MiniRFE 1G is supplied with a cable converting the firewire connector to a standard Sub D 9 RS232 Connector 4321 1 Ground 2 RXD 3 TXD 4 NC Pinout of the Firewire Connector Direct Control via a standard RS232 Terminal Programm The parameters of the MiniRFE 1G visible n the GUI can also be accessed over a standard terminal program The terminal program needs to be set up with the parameters 9600baud 8 Databits 1 Stopbit No FlowControl After initiating the connection a self explaining clear text output is provided Please note that it is not recommended to use a standard terminal progr
8. dule reduces sensitivity Supply current typical mA 390 all outputs terminated with 50R Size mm 60 x 40 x 38 weight nun g housing and assembled PCB without any cables Functional Description of MiniRFE 1G The MiniRFE IG comprises a high sensitive differential InGaAs APD receiver frontend with a micro controller for temperature compensated high voltage HV regulation and digital interfacing via RS 232 Every devide is individually temperature calibrated The device can be controlled from a Windows Graphical User Interface GUI or it can be used stand alone in automatic HV control mode In manual control mode the APD voltage can be set via the GUI The InGaAs APD is connected to a transimpedance amplifier which converts the photo current into a voltage signal This signal is AC coupled and low pass filtered for noise reduction and amplified with an amplifier that features two differential output ports One differential output pair can be monitored as AUX Out and so allows direct control of the received signal amplitude and quality This AUX out can be dissabled to save power The other differential amplifier output 1s converted by a limiting amplifier to standard differential SOR PECL outputs A LOS signal Loss Of Signal 1s provided as SMA output indicated by a red LED and via the digital interface A squelch functionality PECL signals off during LOS can be selected via the GUI The PCB was produced compliant to RoHS
9. roller PCB Printed Circuit Board 12 12
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