ILX Lightwave LDC-3916338 User Manual Download

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Page 1: ...utilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In stoc...

Page 2: ...poration P O Box 6310 Bozeman MT U S A 59771 1 800 459 9459 www ilxlightwave com U S Canada International Inquiries 406 586 1244 Fax 406 586 9405 E mail support ilxlightwave com 70031502_7 01 Artisan...

Page 3: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 4: ...can result in serious injury or death WARNING Visible and or invisible laser radiation Avoid direct exposure to the beam General Safety Considerations If any of the following conditions exist or are...

Page 5: ...mperature range of 0 C to 40 C Storage and transportation temperature of 40 C to 70 C Maximum altitude 3000 m 9843 ft This equipment is suitable for continuous operation Safety Marking Symbols This se...

Page 6: ...e instrument 3 Attach the anti static protective caps that were shipped with the instrument and place the instrument in a protective anti static bag 4 Place the instrument in the original packing cont...

Page 7: ...t a return to the factory is necessary you are issued a Return Authorization RA number Please mark this number on the outside of the shipping box You or your shipping service are responsible for any s...

Page 8: ...Operating a Laser in Constant Current Mode 5 Operating a Laser in Constant Power Mode 8 Conditions which will Automatically Shut Off the Laser Output 12 Chapter 3 Operating in Remote Control Introduct...

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Page 10: ...LDC 3916338 LASER DIODE CURRENT SOURCE MODULE 2 Installation into LDC 3916 or LDC 3908 Laser Diode Controller Mainframe 2 HOW TO CONTACT CUSTOMER SERVICE 3 Calibration and Repair Services 3 General Sh...

Page 11: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 12: ...vice Do not use LDC 3916xxx modules until safe operation can be verified by trained service personnel 1 Visible damage 2 Severe transport stress 3 Prolonged storage under adverse conditions 4 Failure...

Page 13: ...n damage your new Laser Diode Current Source Module Be certain you use proper grounding procedures before you unpack and install your controller module s into the LDC 3916 or LDC 3908 Mainframe Inspec...

Page 14: ...module to an ILX Lightwave facility at some time for repair calibration or service whether it is under warranty or not There is a charge for repairs after the warranty period has expired Contact an I...

Page 15: ...to 5000 A PD Current Resolution 0 1 A PD Current Accuracy 25 C 2 A PD Responsivity Range 12 0 00 to 1000 00 A mW PD Responsivity Resolution 0 01 A mW Optical Power Range 0 00 to 5000 0 mW Optical Powe...

Page 16: ...it 6 Enabling the Modulation Input 7 Setting Photodiode Bias Voltage 7 Turning the Laser Current Source On 7 OPERATING A LASER IN CONSTANT POWER P MODE 8 Calculating Photodiode Responsivity Values 8 E...

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Page 18: ...at a minimum before operating your new LDC 3916338 Laser Diode Current Source LDC 3916338 SERIES CURRENT SOURCE DEFAULT CONFIGURATION LASER CONTROLLER LASER output off LAS current set point LDI or Ise...

Page 19: ...age and mount the user must be careful to avoid multiple earth grounds in the circuit Multiple earth grounds may provide circuit paths that induce spurious currents in the photodiode feedback circuit...

Page 20: ...P D L D Earth Ground Figure 2 1 D Common Laser Anode Photodiode Anode The 9 pin connector on the rear panel bottom connector of your Current Source Module is used to connect your laser diode to the c...

Page 21: ...connected for the module to operate See Tech Note TN3916 2 for more information on 4 wire Voltage Sense Photodiode Connections Many laser diode modules contain an internal photodiode that monitors the...

Page 22: ...titled LASER ERROR INDICATORS The following sections describe fundamentals of single channel operation for your LDC 3916338 Current Source Module s Laser Diode Current Source in two operating modes Co...

Page 23: ...roller mode Constant Current or Constant Power CAUTION Failure to set and ensure a proper Ilim value could result in laser damage Setting the Constant Current Value Next select the Iset parameter on t...

Page 24: ...oltage is supplied to the monitor photodiode or not Set the Bias parameter to ON or OFF as desired Many laser diode modules are tested and characterized by the manufacturer with a 5 volt reverse bias...

Page 25: ...lculate the responsivity is suggested below 1 Measure with a calibrated detector the output power of the laser 2 Measure the corresponding monitor photodiode current 3 Calculate the responsivity CalPD...

Page 26: ...e current set point and the controller mode Constant Current or Constant Power CAUTION Failure to set and ensure a proper Ilim value could result in laser damage Setting the Voltage Limit Next select...

Page 27: ...eter and adjust the value to 1 mW The Controller Module will divide the measured photodiode current by the CalPD value to calculate the laser optical power The current source will automatically adjust...

Page 28: ...ntrol the laser drive current so the monitor photodiode current remains at a constant set point To do this adjust the Mode to Ipd on LAS p 1 of the laser setup menu and set the photodiode current Ipds...

Page 29: ...Circuit 6 TEC High Temperature Limit Condition In addition the LASER Current Limit setting Ilim will clip the laser drive current at the Ilim set point when the signal is being modulated When the LAS...

Page 30: ...clip the drive current at the Ilim value and indicate ILIM on the display E505 Voltage limit warning The voltage on the laser current source is approaching the Vlim value This condition will cause Err...

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Page 32: ...LDC 3916338 LASER DIODE CURRENT SOURCE COMMAND SET 1 LDC 3916338 Laser Diode Current Source Often Used Commands 3 Command Timing and Completion 4 STATUS REPORTING 4 Status Registers 4 Output Off Regis...

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Page 34: ...es REMOTE CONFIGURATION Refer to the LDC 3916 or LDC 3908 Instruction Manual Chapter 3 Operating in Remote Control for information concerning setup of GPIB or RS 232 remote communications That section...

Page 35: ...OD MOD OUT OUT STEP STEP LAS I I MDP MDP V V LIM COND COND EVE EVE OUTOFF OUTOFF ENAB IHBW ILBW MDP MDI MODE LDI MDI MDP SET ABORT DEFAULT LDI LDV MEAS MDI STAT VALUE CAL CAL CLS ESE ESE ESR IDN OPC O...

Page 36: ...Power mode use1 LAS LDI 1 Sets the constant current source set point LAS LDI NONE Returns the measured output current LAS LDV NONE Returns the measured laser voltage LAS LIM I 1 Sets the current sour...

Page 37: ...VE remote queries Refer to the LDC 3916 or LDC 3908 Instruction Manual for details on remote status reporting Each channel of the LDC 3916 or LDC 3908 may contribute to the ALLCOND and ALLEVE register...

Page 38: ...Power Limit 11 n a 4 Interlock Error 12 n a 5 n a 13 n a 6 n a 14 n a 7 Open Circuit 15 n a To ALLCOND Register Figure 3 2 3916338 Condition Registers If bit 1 of the condition register is set the las...

Page 39: ...nable Register LASER ENABle EVEnt nrf LASER ENABle EVEnt LASER Event Bit Reference 0 Current Limit 8 Output Shorted 1 Voltage Limit 9 Tolerance Change 2 n a 10 Output On 3 Power Limit 11 n a 4 Interlo...

Page 40: ...Table 3 2 The registers take on these values at power up as the result of a RST command or when you choose Default from the Save Recall menu These settings are not affected by the PSC Power On Status...

Page 41: ...14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Bitwise Logical AND Bit Reference 0 LASER Current Limit 8 N A 1 LASER Voltage Limit 9 Out of Tolerance 2 N A 10 N A 3 LASER Power Limit output on 11 N A 4 N A 12 N...

Page 42: ...er to Chapter 3 of the Laser Diode Controller Instruction Manual LDC 3916338 SERIES ERROR MESSAGES Error Code Explanation E 103 Length of arbitrary block is different from expected length E 104 Parame...

Page 43: ...it reached the temperature limit This condition will shut down the laser source only when enabled through the GPIB interface E 510 Out of Tolerance Status forces LAS output off E 511 LAS Hardware Erro...

Page 44: ...T 4 CHAPTER 4 1 COMMAND REFERENCE 1 INTRODUCTION 1 LDC 3916338 DEVICE DEPENDENT COMMANDS 3 LDC 3916338 DEVICE COMMAND REFERENCE 3 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOU...

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Page 46: ...NONE Enters the laser voltage calibration mode LAS CAL MDI NONE Used to enter the monitor photodiode current calibration mode LAS CAL MEAS 1 Enters a calibration value LAS CAL STAT NONE Returns a valu...

Page 47: ...nt source output LAS OUT NONE Returns the current source output status LAS SET LDI NONE Returns the laser constant I current set point LAS SET MDI NONE Returns the laser constant optical power set poi...

Page 48: ...of Interest Has special information about the command Examples Shows typical statements using the command Front Panel Remote LASer LIMit I limit value SYNTAX DIAGRAM white space nrf value LAS LIM PARA...

Page 49: ...LASer OUTput LASer COND LASer MDI LASer STEP LASer DEC LASer MDP LASer STEP LASer EVEnt LASer MDP LASer TOL LASer INC LASer MODE LASer TOL n Front Panel LASer BIAS n Remote The LASer BIAS command turn...

Page 50: ...bled n Front Panel LASer CALPD n Remote The LASer CALPD command sets the laser s photodiode feedback responsivity the CAL PD parameter on the selected channel SYNTAX DIAGRAM white space nrf value LAS...

Page 51: ...the selected channel s monitor current power conversion will not be done If the mode is set to P the actual set point will be forced to be near 0 regardless of the LAS MDP value Las CALPD response 1 1...

Page 52: ...rce exits calibration mode n Front Panel LASer CAL DEFAULT n Remote The LASer CAL DEFAULT command is used to restore all of the module s LAS calibration default values SYNTAX DIAGRAM LAS CAL DEFAULT P...

Page 53: ...ode Current Source will allow calibration of the current set point measurement and limit This procedure is outlined in the Calibration section of the Laser module instruction manual EXAMPLES Las CAL L...

Page 54: ...AX DIAGRAM LAS CAL MDI PARAMETERS None POINTS OF INTEREST After this command is issued the LDC 3916338 Laser Diode Current Source will automatically enter the Laser photodiode current calibration mode...

Page 55: ...CAL STATus query is to determine whether the unit is ready for a calibration value and whether it is in calibration mode SYNTAX DIAGRAM LAS CAL STAT PARAMETERS None The response will be an nrf value...

Page 56: ...hich are reported to the status byte and ALLCOND register are set via the LASer ENABle COND command for each channel The Open circuit condition is only present while a Laser output is on and when the...

Page 57: ...is 1 0 mA The first parameter number of steps must be an integer between 1 and 50000 The minimum time to complete one decrement is about 10 to 20 msec Therefore values for the second parameter time b...

Page 58: ...er determine which bits in the Condition Status register are summarized in the 3916 or 3908 status byte SYNTAX DIAGRAM LAS white space nrf value ENAB COND PARAMETERS An nrf value whose sum represents...

Page 59: ...N A 1024 Output Is On 8 Power Limit 2048 N A 16 Interlock Disabled 4096 N A 32 N A 8192 N A 64 N A 16384 N A 128 Open Circuit 32768 N A POINTS OF INTEREST The selected channel s enabled Laser conditi...

Page 60: ...State 2 Laser Voltage Limit Changed State 512 Output Changed Tolerance State 4 N A 1024 Output is On Changed State 8 Power Limit Changed State 2048 N A 16 Interlock Changed State 4096 N A 32 N A 8192...

Page 61: ...e 8 Power Limit Changed State 2048 N A 16 Interlock Changed State 4096 N A 32 N A 8192 N A 64 N A 16384 N A 128 Open Circuit Changed State 32768 N A POINTS OF INTEREST The enabled Laser events for the...

Page 62: ...A 8192 N A 64 N A 16384 N A 128 N A 32768 N A POINTS OF INTEREST The enabled Laser outoff bits for the selected channel can be read by using the LASer ENABle OUTOFF query The default value for this re...

Page 63: ...it With Output On 2048 N A 16 N A 4096 N A 32 N A 8192 N A 64 N A 16384 N A 128 N A 32768 N A POINTS OF INTEREST The selected channel s enabled Laser events can be set by using the LASer ENABle OUTOFF...

Page 64: ...Limit Changed State 2048 N A 16 Interlock Changed State 4096 N A 32 N A 8192 N A 64 N A 16384 N A 128 Open Circuit Changed State 32768 N A POINTS OF INTEREST The events that are reported in the statu...

Page 65: ...Its default value is 1 0 mA The first parameter number of steps must be an integer between 1 and 50000 The minimum time to complete one increment is about 10 to 20 msec Therefore values for the secon...

Page 66: ...anel LASer LDI n Remote The LASer LDI query returns the value of the measured laser current for the selected channel SYNTAX DIAGRAM LAS LDI PARAMETERS None The response is an nrf value POINTS OF INTER...

Page 67: ...S OF INTEREST Response is the selected channel s measured laser output voltage regardless of LAS control mode This measurement is updated approximately once every 600 msec EXAMPLES LAS ldv response 3...

Page 68: ...RAM LAS white space nrf value LIM I PARAMETERS An nrf value which represents the selected channel s Laser limit current in mA POINTS OF INTEREST The current limit is in effect in all modes of operatio...

Page 69: ...ERS An nrf value which represents the selected channel s Laser limit voltage in volts POINTS OF INTEREST The compliance voltage limit is in effect in all modes of operation of the selected channel s l...

Page 70: ...constant MDP mode is used the selected channel s output is limited in hardware only by the LIM I value The LIM MDP condition normally shuts the selected channel s Laser output off but this can be disa...

Page 71: ...t set point in A SYNTAX DIAGRAM white space nrf value LAS MDI PARAMETERS An nrf value which represents the selected channel s photodiode feedback current in A POINTS OF INTEREST On the front panel mon...

Page 72: ...Ser MDP n Remote The LASer MDP command sets the value of the optical power set point in mW SYNTAX DIAGRAM white space nrf value LAS MDP PARAMETERS An nrf value which represents the selected channel s...

Page 73: ...NTAX DIAGRAM LAS MODE PARAMETERS None The response is character data which represents the LAS operating mode POINTS OF INTEREST IHBW mode is the same as ILBW mode low bandwidth except that the output...

Page 74: ...Remote The LASer MODE IHBW command selects laser high bandwidth constant current mode for the selected channel SYNTAX DIAGRAM LAS MODE IHBW PARAMETERS None POINTS OF INTEREST In high bandwidth mode t...

Page 75: ...low bandwidth n Front Panel LASer MODE MDI n Remote The LASer MODE MDI command selects laser constant monitor diode current mode for the present channel SYNTAX DIAGRAM LAS MODE MDI PARAMETERS None PO...

Page 76: ...de n Front Panel LASer MODulation n Remote The LASer MODulation command turns the selected channel s laser modulation switch on or off SYNTAX DIAGRAM white space nrf value LAS MOD PARAMETERS An nrf va...

Page 77: ...EREST More than one channel at a time may be modulated via the modulation signal if desired EXAMPLES Las MODULATION response 0 means that the selected channel s modulation switch is disabled LAS MOD r...

Page 78: ...channel s laser output current to 20 mA and then turns the selected channel s output on Las Out 0 action turns the selected channel s laser output off n Front Panel LASer OUTput n Remote The LASer OU...

Page 79: ...I query returns the constant current setpoint which is used for both bandwidth modes SYNTAX DIAGRAM LAS SET LDI PARAMETERS None The response is an nrf value which represents the selected channel s con...

Page 80: ...f the laser EXAMPLES las set mdi response 30 0 means the selected channel s laser monitor PD current setpoint is 30 A for use in constant MDI mode n Front Panel LASer SET MDP n Remote The LASer SET MD...

Page 81: ...0 0 mA so the Las set i query will return a value of 30 0 mA LAS STEP 10 action sets the selected channel s step size to 10 00 mA Front Panel LASer STEP n Remote The LASer STEP query is used to read b...

Page 82: ...ived A current measurement is made and the result is returned as the response After the measurement is made the measurement system returns to its normal function switching between the various signals...

Page 83: ...ed A voltage measurement is made and the result is returned as the response After the measurement is made the measurement system returns to its normal function switching between the various signals an...

Page 84: ...ived The photodiode current measurement is made and the result is returned as the response After the measurement is made the measurement system returns to its normal function switching between the var...

Page 85: ...he monitor current measure signal when this query is received The photodiode current measurement is made optical power is calculated and the result is returned as the response After the measurement is...

Page 86: ...is set too tight the output may never reach tolerance EXAMPLES LAS LDI 750 LAS TOL 0 5 1 LAS OUT ON action the laser current will be in tolerance when it is within 0 5 mA of 750 00 mA for a period of...

Page 87: ...e current 3 PPD optical power 4 VF laser diode forward voltage The default condition of the status menu displays laser diode current LDI on line 1 and photodiode current IPD on line 2 EXAMPLES STATMEN...

Page 88: ...response photodiode current is displayed on line 1 of the status menu Front Panel STATMENU LINE1 LDI n Remote The STATMENU LINE1 LDI command sets the measurement that is to be displayed on line 1 of t...

Page 89: ...y as accurate as the user s CALPD value EXAMPLES STATMENU LINE1 PPD response optical power is displayed on line 1 of the status menu Front Panel STATMENU LINE1 VF n Remote The STATMENU LINE1 VF comman...

Page 90: ...e current 3 PPD optical power 4 VF laser diode forward voltage The default condition of the status menu displays laser diode current LDI on line 1 and photodiode current IPD on line 2 EXAMPLES STATMEN...

Page 91: ...response photodiode current is displayed on line 2 of the status menu Front Panel STATMENU LINE2 LDI n Remote The STATMENU LINE2 LDI command sets the measurement that is to be displayed on line 2 of t...

Page 92: ...y as accurate as the user s CALPD value EXAMPLES STATMENU LINE2 PPD response optical power is displayed on line 2 of the status menu Front Panel STATMENU LINE2 VF n Remote The STATMENU LINE2 VF comman...

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Page 94: ...RRENT SOURCE 3 Current Source Calibration 3 IPD Current Calibration 4 Laser Forward Voltage Measurement Calibration 5 REMOTE CALIBRATION OF THE 3916338 CURRENT SOURCE MODULE 6 Laser Current Source Cal...

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Page 96: ...s supplied by the user as part of the calibration process Your 3916338 Module can be calibrated while installed in a 3916 or 3908 mainframe with the case closed It should be calibrated every 12 months...

Page 97: ...50W resistor low TCR PHOTODIODE MONITOR CURRENT CALIBRATION See schematic in Fig 5 1 Table 5 2 Required Calibration Components U1 TIL117 1 2 3 4 5 6 A V R 3 R2 100 9 Pin D Sub LD Cathode 5 LD Anode 9...

Page 98: ...red load resistance a 4 point probe resistance measurement is recommended I is the calculated current in Amps NOTE We recommend that the load resistor be temperature controlled during the calibration...

Page 99: ...Enter the IPD calibration mode by pushing the DISPLAY MAIN front panel button then the Sys Config soft key then the Cal soft key then the Cal LAS soft key then the IPD Cal soft key The module s IPD ca...

Page 100: ...START soft key The internal calibration procedure will turn on the output and drive the LD current to approximately 25 of full range Allow the current to settle for at least 10 seconds e Then measure...

Page 101: ...hese points The module s internal cal procedure will then use this information to calibrate the current source a With the output off connect a 1 20 W resistor across the LASER output terminals Laser A...

Page 102: ...NOTE The internal cal procedure will store the actual measured value and briefly change its measurement status to 0 to indicate that it is not yet ready for another measurement This will occur after...

Page 103: ...on value is to be measured and entered remotely via a GPIB controlled DMM for example the actual value of the current should not be entered until the cal procedure is ready to receive it e Check to se...

Page 104: ...until the cal procedure is ready to receive it e Check to see if the internal cal procedure is ready for the measurement Send the following query LAS CAL STATUS The cal procedure is ready for a measur...

Page 105: ...rt LASER CURRENT SOURCE Power on but no current output Check Interlock pins on LASER input connector on instrument rear panel These pins must be shorted either directly or through a switch The front p...

Page 106: ...little or no power is measured Check the photodiode bias If it is off the circuit may act as an open feedback loop Set the bias to on 5V Output exceeds Power Limit It is possible via GPIB to disable t...

Page 107: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...

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