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Agilent Technologies Agilent 86120C manual To move the cursor to view other signals, press

Models: Agilent 86120C

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Page 33

Making Measurements

Measuring Wavelength and Power

3To move the cursor to view other signals, press:

•PREV WL to select next (previous) shorter wavelength.

•NEXT WL to select next longer wavelength.

•PEAK to signal with greatest power.

•PREV PK to select next lower power signal.

•NEXT PK to select next higher power signal.

2-5

Image 33

Agilent Technologies Agilent 86120C To move the cursor to view other signals, press, PEAK to signal with greatest power

Contents

Agilent 86120C Multi-Wavelength Meter User’s Guide Notices The Agilent 86120C-At a Glance angled physical contact interfaceCharacterize laser lines easily must not be exceeded “Programming” and Chapter 4, “Programming Commands” provide allPrint measurement results Program the instrument for automatic measurementsThe Agilent 86120C-At a Glance Measurement accuracy-it’s up to youThere is no output laser aperture General Safety ConsiderationsWA R N I N G WA R N I N G WA R N I N G WA R N I N G WA R N I N G C A U T I O N C A U T I O N C A U T I O N C A U T I O N C A U T I O N The Agilent 86120C-At a Glance General Safety Considerations ContentsStep 2. Connect the Line-Power Cable 5 Step 3. Connect a Printer Returning the Instrument for ServiceInstrument Preset Conditions Laser Safety InformationFETCh Measurement Instruction 79 HCOPy Subsystem Test 1. Absolute Wavelength Accuracy 3 Test 2. SensitivityAgilent Technologies Service Offices Menu Maps Error Messages Front-Panel Fiber-Optic Adapters Power CordsContents Contents-3Page Step 1. Inspect the Shipment Getting StartedC A U T I O N C A U T I O N C A U T I O N C A U T I O N Getting StartedGetting Started Measurement accuracy-it’s up to youStep 1. Inspect the Shipment Step 1. Inspect the ShipmentStep 2. Connect the Line- Power Cable WA R N I N GC A U T I O N C A U T I O N C A U T I O N page 7 Step 3. Connect a PrinterInstrument firmware version Step 4. Turn on the Agilent 86120CConverting feet to meters Step 5. Enter Your ElevationDefinition of standard air Step 6. Select Medium for Wavelength ValuesStep 7. Turn Off Wavelength Limiting Returning the Instrument for Service C A U T I O N C A U T I O N Preparing the instrument for shippingThe carton must be large enough to allow approximately 7 cm Returning the Instrument for Service Getting Started1-14 Returning the Instrument for Service Getting Started1-15 Page Measuring Signal- to- Noise Ratios Measuring Wavelength and PowerMeasuring Signal- to- Noise Ratios with Averaging Measuring Total Power Greater than 10 dBmAgilent 86120C, refer to “Calibrating Measurements” on page 2 Making MeasurementsPeak WL mode 2 List by WL or Power modes 2 Measuring Wavelength and PowerTotal power and average wavelength 2 Graphical display of optical power spectrum 2 Instrument states 2Peak WL mode To display peak wavelength and powerPEAK to signal with greatest power 3 To move the cursor to view other signals, pressPREV PK to select next lower power signal NEXT PK to select next higher power signalTo display multiple laser lines List by WL or Power modesTotal power and average wavelength Limiting the wavelength measurement range To display average wavelength and total powerTo limit the wavelength range n is the number of laser lines included in the measurementTo measure broadband devices Measuring broadband devices and chirped lasersTo see the graphical display Graphical display of optical power spectrumTo control the power bar Power barInstrument states To save an instrument stateDisplayed units Changing the Units and Measurement RateTo change the units of measure Displayed units 2 Measurement rateMeasurement rate Continuous or single measurements To change the measurement speedTo select single measurement acquisition Defining Laser- Line Peaks To define laser- line peaks If too many lines are identified Measuring Laser Separation Channel separation 2 Measuring flatness 2This section includes Channel separation To measure channel separation To measure flatness Measuring flatnessMeasuring Laser Drift Measuring Laser DriftIf measurement updating stops or the values become blanked To measure driftDuring the measurement, you can change the display mode to Peak WL Signal-to-noise display Measuring Signal- to- Noise RatiosAutomatic When the signal- to- noise “auto” function is selected, the Repetitive data formats Automatic interpolationTo measure signal- to- noise Measuring Signal- to- Noise Ratios with Averaging To measure signal- to- noise with averaging To characterize a Fabry- Perot laser Measuring Fabry- Perot FP LasersΣ Pi The summation of the power in each of the selected peaks, or Measuring Modulated Lasers Measuring Modulated LasersPRBS modulation graph showing raised noise floor To measure total power exceeding 10 dBm Measuring Total Power Greater than 10 dBmDefinition of standard air Calibrating MeasurementsTo enter the elevation To select the medium for lightConverting feet to meters To create a hardcopy Printing Measurement ResultsChoosing the Right Connector Cleaning Connections for Accurate MeasurementsFigure 2-3. Basic components of a connector Figure 2-4. Universal adapters to Diamond HMS-10 Figure 2-5. Cross-section of the Diamond HMS-10 connectorInspecting Connectors Avoid matching gel and oils Avoid over tightening connections Measuring insertion loss and return loss Visual inspection of fiber ends Cleaning Connectorsmanufacturer for information on application and cleaning procedures To clean a non- lensed connectorthink the use of such compounds is necessary, refer to the compound leave filmy deposits on fiber ends that can degrade performancecompressed air canister To clean an adapter2 Clean the adapter with the foam swab Programming Lists of Commands 3Addressing and Initializing the Instrument 3 Making MeasurementsWhere to begin… Types of commandsProgramming Addressing and Initializing the Instrument Remote mode and front- panel lockoutInitialize the instrument at start of every program Set single acquisition mode To change the GPIB addressMaking Measurements After collecting the uncorrected data, the Agilent 86120C searches the data for the first 200 peak responses. For WLIMitOFF, searching starts at 1650 nm and progresses towards 1270 nm. For WLIMitON, searching starts at WLIMitSTART and progresses toward WLIMitSTOP. These peak values are then placed into the corrected data buffer. Each peak value consists of an amplitude and wavelength measurement. Amplitude and wavelength correction factors are applied to this data Commands are grouped in subsystems Making Measurements Table 2-4. Commands for Capturing DataRefer to “FPERotSTATE” on pageMeasurement instructions give quick results MEASure commandFETCh command READ commandReturn single or multiple measurement values CONFigure commandARRay and the SCPI standard Or, the *WAI command could be used Measure delta, drift, and signal- to- noise Measurements are returned as strings The format of returned dataDetermine the number of data points Data can be corrected for elevation and vacuumMonitoring the Instrument Monitoring the InstrumentStatus Byte register Status registersProgramming Monitoring the Instrument3-18 Table 3-6. Bits in Operation Status Register OPERation Status and QUEStionable Status registersStandard Event Status register Enabling register bits with masks Error queue QueuesOutput queue Sending a command SCPI command are grouped in subsystemsReviewing SCPI Syntax Rules Use either short or long formsYou can use upper or lowercase letters Combine commands in the same subsystemSending common commands Combine commands from different subsystemsAdding parameters to a command White spaceTable 3-9. Suffix Multipliers 0.28E2 280E-1 28000m 0.028K 28E-3KMultiplier MnemonicQuerying data Program message terminatorExample Programs Errormsg subroutineMany subroutines are repeated in the examples Setese subroutineErrmngmt subroutine FNIdentity functionCmdopc subroutine Tempo subroutineCOM /Instrument/ @Mwm DIM Errmsg$255 INTEGER Cme CLEAR REPEAT Example 1. Measure a DFB laserOUTPUT @Mwm*ESR? ENTER @MwmCme OUTPUT @MwmSYSTERR? ENTER @MwmErrmsg$ PRINT Errmsg$COM /Instrument/ @MwmV DIM Identity$50 Identity$= OUTPUT @Mwm*RST Example ProgramsOUTPUT @Mwm*OPC? ENTER @MwmOpcdone OUTPUT @Mwm*IDN? ENTER @MwmIdentity$ RETURN Identity$Example Programs Example 2. Measure WDM channelsPRINT Errmsg$ Example ProgramsUNTIL NOT BITCme,2 AND NOT BITCme,4 AND NOT BITCme,5 AND Err$,+0 COM /Instrument/ @Mwm OUTPUT @Mwm *ESEIVAL00110100,2Turn on the drift calculation Example 3. Measure WDM channel driftTurn off all drift states Turn on drift reference stateExample Programs Query reference wavelengths and powersTurn off drift reference state Turn on drift max min calculationExample Programs ProgrammingSubendSUBEND SeteseSUB Setese SUBEND IdentityDEF FNIdentity$PRINT USING 6A,2D,17A,M4D.3D,31A,S2D.2D,4ALine I wavelength is Example 4. Measure WDM channel separationExample Programs Example Programs Example 5. Measure signal- to- noise ratio of each WDM channelProgramming NEXT STOP ErrormsgExample Programs FOR I=1 TO NbptExample 6. Increase a source’s wavelength accuracy OUTPUT @MwmMEASSCALPOWWAV? ENTER @MwmCurrentwl Example ProgramsLists of Commands Table 3-10. Programming Commands 1 ofLists of Commands Lists of Commands Table 3-10. Programming Commands 2 ofLists of Commands Table 3-10. Programming Commands 3 ofLists of Commands Table 3-10. Programming Commands 4 ofTable 3-10. Programming Commands 5 of Lists of CommandsTable 3-11. Keys Versus Commands 1 of Lists of Commands∆ WL Lists of Commands Table 3-11. Keys Versus Commands 2 ofLists of Commands Programming3-50 Common Commands 4 Measurement Instructions 4 CALCulate1 Subsystem 4 Programming CommandsCONFigure Measurement Instruction 4 DISPlay Subsystem 4 CALCulate2 Subsystem 4 CALCulate3 Subsystem 4Programming Commands Table 4-12. Notation Conventions and DefinitionsProgramming Commands Common Commands Example Query ResponseSyntax*ESR? ESR?Query Response ExampleIDN? Page Syntax*RST Table 4-15. Conditions Set by *RST Reset 2 of Page the status byte register to generate a service request In this example, the command enables ESB event summary bit 5 inCommon Commands Query ResponseSTB? TST? Syntax*WAI Measurement Instructions Measurement InstructionsThe commands in this subsystem have the following command hierar- chy POWer? FREQuency? WAVelength? WNUMber?MEASure READ? FETCh? CONFigure? ARRay SCALar Measurement InstructionsCONFigure command MEASureARRay SCALar POWer?Examples CONFARRPOW FETCARRPOW? READARRPOW? MEASARRPOW? CONFigure command MEASureARRay SCALar POWerFREQuen- cy?The following line is an example of a returned string when CONFigure command MEASureARRay SCALar POWerWAVe- length?Constants resolutionExamples Query ResponseCONFigure command MEASureARRay SCALar POWerWNUMber?Syntax expectedvalue MAXimumIf the MEASSCALPOWWNUM? 6451 command is sent, and a FREQuency POINts CALCulate1 Subsystemtions” on page 4 DATA?or, 1557.137 nm in vacuum CALCulate1 Subsystem Non-sequential command TRANsformFREQuencyPOINtsthat is located in “Making Measurements” on page 3- 5 . Changing the For fast update For normal update+15,047 +7,525STATe CALCulate2 SubsystemSTATe STARt FREQuency WAVelength WNUMber STOP FREQuency WAVelength WNUMberDATA? completed. If CALC2PWAVSTAT is on, the total input power isQueries the array of laser-line frequencies after the peak search is Queries the array of laser-line wavelengths after the peak searchSyntax PEXCursionAttribute SummaryPTHReshold POINts?Non-sequential command SyntaxPWAVerageSTATe “Defining Laser- Line Peaks” on page 2Non-sequential command CALCulate2 Subsystem Non-sequential command WLIMitSTATeSyntax AttributeNon-sequential command WLIMitSTARtFREQuencyNon-sequential command WLIMitSTARtWAVelengthSyntax AttributeNon-sequential command WLIMitSTARtWNUMberSyntax AttributeNon-sequential command WLIMitSTOPFREQuencySyntax AttributeNon-sequential command WLIMitSTOPWAVelengthSyntax AttributeNon-sequential command WLIMitSTOPWNUMberSyntax AttributeCALCulate3 Subsystem STATE FWHM WAVelength? FREQuency? WNUMber? MEAN WAVelength? WAVelength? FREQuency? WNUMber? POWer? POWer WAVelength? FREQuency?FREQuency? WNUMber? MODE WAVelength? FREQuency? WNUMber? PEAK WNUMber? SIGMa WAVelength? FREQuency? WNUMber?Syntax ASNRCLEarAttribute SummarySyntax ASNRCOUNtAttribute Summarytion on selecting measurements ASNRSTATeQueries the array of laser-line frequencies after the calculation is DATA?Queries the array of laser-line wavelengths after the calculation is Queries the array of laser-line wave numbers after the calculationDELTaPRESet DELTaPOWerSTATeSyntax AttributeDELTaREFerenceFREQuency DELTaREFerencePOWer?Description 181.6924 THzSyntax DELTaREFerenceWAVelengthAttribute SummarySyntax DELTaREFerenceWNUMberAttribute SummarySyntax DELTaWAVelengthSTATeAttribute SummaryDELTaWPOWerSTATe Syntax DRIFtDIFFerenceSTATeAttribute SummarySyntax DRIFtMAXimumSTATeAttribute SummarySyntax DRIFtMINimumSTATeAttribute SummaryDRIFtREFerenceRESet DRIFtPRESetSyntax AttributeSyntax DRIFtREFerenceSTATeAttribute SummarySyntax DRIFtSTATeAttribute SummaryFPERotFWHM? FPERotSTATE+5.47128800E-009 +6.93436400E+011+1.53878000E-006 FPERotMEAN?+1.94824800E+014 +6.49865400E+003Argument FPERotMODESPACing?Description WAVelength+1.54073400E-006 FPERotPEAK?+1.94577600E+014 +6.49041000E+003WATTs FPERotPOWer?dBm DBM watts WATTsArgument FPERotSIGMa?Description WAVelengthPOINts? PRESetSyntax AttributeSyntax SNRAUTOAttribute SummarySyntax SNRREFerenceFREQuencyAttribute SummarySyntax SNRREFerenceWAVelengthAttribute SummarySyntax SNRREFerenceWNUMberAttribute SummaryPreset State off Turns the signal- to- noise calculation on and offSNRSTATe RST State offCONFigure Measurement Instruction CONFigure Measurement InstructionMAXimum LEFT NEXT PREVious RIGHt DISPlay SubsystemGRAPhics STATe DISPlay SubsystemMARKerMAXimumLEFT MARKerMAXimumSyntax AttributeMARKerMAXimumPREVious MARKerMAXimumNEXTSyntax AttributeWINDowGRAPhicsSTATe MARKerMAXimumRIGHtSyntax AttributeFETCh Measurement Instruction FETCh Measurement InstructionIMMediate HCOPy SubsystemMEASure Measurement Instruction MEASure Measurement InstructionREAD Measurement Instruction READ Measurement InstructionDEVice ELEVations MEDium OFFSet MAGNitude SENSe SubsystemSENSe CORRection DATA?page 4 CORRectionDEVice0Description CORRectionELEVationNon-sequential command SyntaxSyntax CORRectionMEDiumAttribute SummarySyntax CORRectionOFFSetMAGNitudeAttribute Summaryon page ment of an instrument function. Refer to “Measurement Instructions”DATA? for 30 or 40 secondsQuery Response The following string shows an example of the first few measurements returned by this query STATus Subsystem STATus SubsystemOPERation QUEStionableCONDition? page 3STATus Subsystem Syntax OPERation QUEStionableENABleAttribute SummarySyntax OPERation QUEStionableEVENtQuery Response AttributeSyntax OPERation QUEStionableNTRansitionAttribute SummarySyntax OPERation QUEStionablePTRansitionAttribute SummaryPRESet Table 4-18. Preset ValuesSYSTem Subsystem HEADers?SYSTem Subsystem Syntax ERRorAttribute SummarySyntax HELPHEADers?Attribute SummaryTable 4-19. Instrument Conditions 1 of PRESetSYSTem Subsystem SYSTem Subsystem Table 4-19. Instrument Conditions 2 ofVERSion Table 4-20. SCPI Version NumbersSYSTem Subsystem TRIGger Subsystem TRIGger SubsystemSyntax ABORtAttribute SummaryNon-sequential command INITiateCONTinuousSyntax AttributeNon-sequential command INITiateIMMediateSyntax AttributePOWer UNIT SubsystemUNIT Subsystem Programming Commands UNIT Subsystem4-108 Test 1. Absolute Wavelength Accuracy Performance TestsTest Sensitivity 5Calibration Cycle Performance TestsTest 1. Absolute Wavelength Accuracy 5 TestTest 1. Absolute Wavelength Accuracy be damaged when total input power exceeds 18 dBmbe damaged when total input power exceeds 18 dBm Test 2. Sensitivitybe damaged when total input power exceeds 18 dBm Test 3. Polarization DependenceTest 4. Optical Input Return Loss Procedure Standard instruments flat contacting connectorsand Regulatory Information” Procedure Option 022 instruments angled contacting connectorsTest 4. Optical Input Return Loss FC/APC patchcord lossTest 5. Amplitude Accuracy and Linearity Polarization sensitivityProcedure completely filled in Desired Power Table 5-21. Linearity Data ValuesPower Meter Test 5. Amplitude Accuracy and LinearityPage Specifications and Regulatory Information Laser Safety Information 6Product Overview Specifications and Regulatory Information Specifications and Regulatory InformationCalibration Cycle Definition of Terms the wavelength difference between two signals that are simultaneouslyduring manufacturing at 1523.488 nm, or 196.7804 THz presentpower the polarization of the input signal is variedlaser lines present to accurately measure wavelength and power panel connector, and assumes the user’s connector is goodWavelength Specifications-NORMAL Update ModeSpecifications-NORMAL Update Mode 10 GHz 0.08 nm at 1550 nm, 0.06 nm at 1300 nmSensitivity AmplitudeSelectivity Specifications-NORMAL Update ModeMeasurement Cycle Time Input Return LossMeasurement Applications Specifications-NORMAL Update ModeFAST update mode unless noted. Refer to “Measurement rate” on page 2 Specifications-FAST Update ModeSpecifications-FAST Update Mode WavelengthAmplitude Specifications-FAST Update ModeSensitivity SelectivityInput Return Loss Specifications-FAST Update ModeMeasurement Cycle Time Measurement ApplicationsOperating Specifications Operating SpecificationsOperating Specifications Please pay attention to the following laser safety warnings Laser Safety InformationThis ISM device complies with Canadian ICES-001 Compliance with Canadian EMC RequirementsCet appareil ISM est conforme à la norme NMB-001 du Canada Notice for Germany Noise DeclarationDeclaration of Conformity Declaration of ConformityProduct Overview Front view of instrument Rear view of instrumentProduct Overview Specifications and Regulatory Information Product Overview6-16 Error Messages Instrument Preset ConditionsAgilent Technologies Service Offices ReferenceTable 5-22. Instrument Preset Conditions 1 of Instrument Preset ConditionsSettings after Preset Settings after PowerSettings after Power Table 5-22. Instrument Preset Conditions 2 ofInstrument Preset Conditions Settings after PresetMenu Maps Menu MapsMenu Maps Appl’s MenuDisplay Avg WL Menu Display List by Power MenuMeasurement Cont Menu There is no menu associated with this keyMenu Maps Display List by WL Menu Delta On MenuMeasurement Single Menu Delta Off Menu Display Peak WL and System Preset MenusThere is no menu associated with this key Menu MapsMenu Maps System Print MenuMenu Maps System Setup MenuTable 5-23. Instrument Specific Error Messages 1 of Error MessagesError Messages Table 5-23. Instrument Specific Error Messages 2 ofError Number Error MessageError Messages Table 5-23. Instrument Specific Error Messages 3 ofError Number Error MessageError Messages Table 5-24. General SCPI Error Messages 1 ofError Number DescriptionError Messages Table 5-24. General SCPI Error Messages 2 ofError Number DescriptionError Messages Table 5-24. General SCPI Error Messages 3 ofError Number DescriptionFront-Panel Fiber-Optic Adapters Front-Panel Fiber-Optic AdaptersFront Panel DescriptionAgilent Technologies Service Offices Power CordsPower Cords Plug TypeAgilent Technologies Service Offices Agilent Technologies Service NumbersPage Index NumericsIndex Index-3 IndexIndex-4 IndexIndex-5 IndexIndex-6 IndexIndex-7 IndexPage Page Agilent Technologies  Agilent Technologies GmbH Printed in Germany AugustSecond edition, August 86120-90C03