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Agilent Technologies Agilent 86120C manual To measure signal- to- noise

Models: Agilent 86120C

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Page 56

Making Measurements

Measuring Signal-to-Noise Ratios

To measure signal- to- noise

1Press the front- panel Preset key.

2Press List by WL or List by Power.

3Press Appl’s and then S/N.

4To select the wavelength reference for measuring the noise, do the following steps:

a Press WL REF, and

•press AUTO to let the instrument interpolate the wavelength, or

•press USER to select the last wavelength manually entered.

bIf you chose USER, you can specify the wavelength by pressing USER

WL. Use the softkey to select the digit that requires editing. Use

the and softkeys to change the value.

cPress RETURN.

5While the signal- to- noise measurements are displayed, you can press PEAK anytime to select the signal with the highest power.

2-28

Image 56

Agilent Technologies Agilent 86120C manual To measure signal- to- noise

Contents

Agilent 86120C Multi-Wavelength Meter User’s Guide Notices Characterize laser lines easily The Agilent 86120C-At a Glanceangled physical contact interface “Programming” and Chapter 4, “Programming Commands” provide all must not be exceededPrint measurement results Program the instrument for automatic measurementsMeasurement accuracy-it’s up to you The Agilent 86120C-At a GlanceGeneral Safety Considerations There is no output laser apertureWA 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 Contents The Agilent 86120C-At a Glance General Safety ConsiderationsStep 2. Connect the Line-Power Cable 5 Step 3. Connect a Printer Returning the Instrument for ServiceLaser Safety Information Instrument Preset ConditionsFETCh Measurement Instruction 79 HCOPy Subsystem Test 1. Absolute Wavelength Accuracy 3 Test 2. SensitivityMenu Maps Error Messages Front-Panel Fiber-Optic Adapters Power Cords Agilent Technologies Service OfficesContents Contents-3Page Getting Started Step 1. Inspect the ShipmentGetting Started 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 NMeasurement accuracy-it’s up to you Getting StartedStep 1. Inspect the Shipment Step 1. Inspect the ShipmentC A U T I O N C A U T I O N C A U T I O N Step 2. Connect the Line- Power CableWA R N I N G Step 3. Connect a Printer page 7Step 4. Turn on the Agilent 86120C Instrument firmware versionStep 5. Enter Your Elevation Converting feet to metersStep 6. Select Medium for Wavelength Values Definition of standard airStep 7. Turn Off Wavelength Limiting Returning the Instrument for Service Preparing the instrument for shipping C A U T I O N C A U T I O NThe carton must be large enough to allow approximately 7 cm 1-14 Returning the Instrument for ServiceGetting Started 1-15 Returning the Instrument for ServiceGetting Started Page Measuring Wavelength and Power Measuring Signal- to- Noise RatiosMeasuring Signal- to- Noise Ratios with Averaging Measuring Total Power Greater than 10 dBmMaking Measurements Agilent 86120C, refer to “Calibrating Measurements” on page 2Measuring Wavelength and Power Peak WL mode 2 List by WL or Power modes 2Total power and average wavelength 2 Graphical display of optical power spectrum 2 Instrument states 2To display peak wavelength and power Peak WL mode3 To move the cursor to view other signals, press PEAK to signal with greatest powerPREV PK to select next lower power signal NEXT PK to select next higher power signalList by WL or Power modes To display multiple laser linesTotal power and average wavelength To display average wavelength and total power Limiting the wavelength measurement rangeTo limit the wavelength range n is the number of laser lines included in the measurementMeasuring broadband devices and chirped lasers To measure broadband devicesGraphical display of optical power spectrum To see the graphical displayPower bar To control the power barInstrument states To save an instrument stateChanging the Units and Measurement Rate Displayed unitsTo change the units of measure Displayed units 2 Measurement rateMeasurement rate To select single measurement acquisition Continuous or single measurementsTo change the measurement speed Defining Laser- Line Peaks To define laser- line peaks If too many lines are identified This section includes Measuring Laser SeparationChannel separation 2 Measuring flatness 2 Channel separation To measure channel separation Measuring flatness To measure flatnessMeasuring Laser Drift Measuring Laser DriftTo measure drift If measurement updating stops or the values become blankedDuring the measurement, you can change the display mode to Peak WL Measuring Signal- to- Noise Ratios Signal-to-noise displayAutomatic When the signal- to- noise “auto” function is selected, the Automatic interpolation Repetitive data formatsTo measure signal- to- noise Measuring Signal- to- Noise Ratios with Averaging To measure signal- to- noise with averaging Measuring Fabry- Perot FP Lasers To characterize a Fabry- Perot laserΣ 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 Measuring Total Power Greater than 10 dBm To measure total power exceeding 10 dBmCalibrating Measurements Definition of standard airConverting feet to meters To enter the elevationTo select the medium for light Printing Measurement Results To create a hardcopyCleaning Connections for Accurate Measurements Choosing the Right ConnectorFigure 2-3. Basic components of a connector Figure 2-5. Cross-section of the Diamond HMS-10 connector Figure 2-4. Universal adapters to Diamond HMS-10Inspecting Connectors Avoid matching gel and oils Avoid over tightening connections Measuring insertion loss and return loss Cleaning Connectors Visual inspection of fiber endsTo clean a non- lensed connector manufacturer for information on application and cleaning proceduresthink the use of such compounds is necessary, refer to the compound leave filmy deposits on fiber ends that can degrade performanceTo clean an adapter compressed air canister2 Clean the adapter with the foam swab Lists of Commands 3 ProgrammingAddressing and Initializing the Instrument 3 Making MeasurementsProgramming Where to begin…Types of commands Initialize the instrument at start of every program Addressing and Initializing the InstrumentRemote mode and front- panel lockout To change the GPIB address Set single acquisition modeMaking 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 Table 2-4. Commands for Capturing Data Making MeasurementsRefer to “FPERotSTATE” on pageMEASure command Measurement instructions give quick resultsREAD command FETCh commandCONFigure command Return single or multiple measurement valuesARRay and the SCPI standard Or, the *WAI command could be used Measure delta, drift, and signal- to- noise The format of returned data Measurements are returned as stringsDetermine the number of data points Data can be corrected for elevation and vacuumMonitoring the Instrument Monitoring the InstrumentStatus registers Status Byte register3-18 ProgrammingMonitoring the Instrument OPERation Status and QUEStionable Status registers Table 3-6. Bits in Operation Status RegisterStandard Event Status register Enabling register bits with masks Output queue Error queueQueues SCPI command are grouped in subsystems Sending a commandReviewing SCPI Syntax Rules Use either short or long formsCombine commands in the same subsystem You can use upper or lowercase lettersCombine commands from different subsystems Sending common commandsAdding parameters to a command White space0.28E2 280E-1 28000m 0.028K 28E-3K Table 3-9. Suffix MultipliersMultiplier MnemonicProgram message terminator Querying dataErrormsg subroutine Example ProgramsMany subroutines are repeated in the examples Setese subroutineFNIdentity function Errmngmt subroutineCmdopc subroutine Tempo subroutineExample 1. Measure a DFB laser COM /Instrument/ @Mwm DIM Errmsg$255 INTEGER Cme CLEAR REPEATOUTPUT @Mwm*ESR? ENTER @MwmCme OUTPUT @MwmSYSTERR? ENTER @MwmErrmsg$ PRINT Errmsg$Example Programs COM /Instrument/ @MwmV DIM Identity$50 Identity$= OUTPUT @Mwm*RSTOUTPUT @Mwm*OPC? ENTER @MwmOpcdone OUTPUT @Mwm*IDN? ENTER @MwmIdentity$ RETURN Identity$Example 2. Measure WDM channels Example ProgramsExample Programs PRINT Errmsg$UNTIL NOT BITCme,2 AND NOT BITCme,4 AND NOT BITCme,5 AND Err$,+0 COM /Instrument/ @Mwm OUTPUT @Mwm *ESEIVAL00110100,2Example 3. Measure WDM channel drift Turn on the drift calculationTurn off all drift states Turn on drift reference stateQuery reference wavelengths and powers Example ProgramsTurn off drift reference state Turn on drift max min calculationProgramming Example ProgramsSubendSUBEND SeteseSUB Setese SUBEND IdentityDEF FNIdentity$Example 4. Measure WDM channel separation PRINT USING 6A,2D,17A,M4D.3D,31A,S2D.2D,4ALine I wavelength isExample Programs Example 5. Measure signal- to- noise ratio of each WDM channel Example ProgramsNEXT STOP Errormsg ProgrammingExample Programs FOR I=1 TO NbptExample 6. Increase a source’s wavelength accuracy Example Programs OUTPUT @MwmMEASSCALPOWWAV? ENTER @MwmCurrentwlLists of Commands Lists of CommandsTable 3-10. Programming Commands 1 of Table 3-10. Programming Commands 2 of Lists of CommandsTable 3-10. Programming Commands 3 of Lists of CommandsTable 3-10. Programming Commands 4 of Lists of CommandsLists of Commands Table 3-10. Programming Commands 5 of∆ WL Table 3-11. Keys Versus Commands 1 ofLists of Commands Table 3-11. Keys Versus Commands 2 of Lists of Commands3-50 Lists of CommandsProgramming Programming Commands Common Commands 4 Measurement Instructions 4 CALCulate1 Subsystem 4CONFigure Measurement Instruction 4 DISPlay Subsystem 4 CALCulate2 Subsystem 4 CALCulate3 Subsystem 4Programming Commands Programming CommandsTable 4-12. Notation Conventions and Definitions Common Commands Query Response ExampleESR? Syntax*ESR?Query Response ExampleIDN? Page Syntax*RST Table 4-15. Conditions Set by *RST Reset 2 of Page In this example, the command enables ESB event summary bit 5 in the status byte register to generate a service requestCommon Commands Query ResponseSTB? TST? Syntax*WAI Measurement Instructions Measurement InstructionsPOWer? FREQuency? WAVelength? WNUMber? The commands in this subsystem have the following command hierar- chyMEASure READ? FETCh? CONFigure? ARRay SCALar Measurement InstructionsMEASureARRay SCALar POWer? CONFigure commandExamples CONFARRPOW FETCARRPOW? READARRPOW? MEASARRPOW? MEASureARRay SCALar POWerFREQuen- cy? CONFigure commandThe following line is an example of a returned string when MEASureARRay SCALar POWerWAVe- length? CONFigure commandresolution ConstantsExamples Query ResponseMEASureARRay SCALar POWerWNUMber? CONFigure commandSyntax expectedvalue MAXimumIf the MEASSCALPOWWNUM? 6451 command is sent, and a CALCulate1 Subsystem FREQuency POINtsDATA? tions” on page 4or, 1557.137 nm in vacuum CALCulate1 Subsystem that is located in “Making Measurements” on page 3- 5 . Changing the Non-sequential commandTRANsformFREQuencyPOINts For normal update For fast update+15,047 +7,525CALCulate2 Subsystem STATeSTATe STARt FREQuency WAVelength WNUMber STOP FREQuency WAVelength WNUMbercompleted. If CALC2PWAVSTAT is on, the total input power is DATA?Queries the array of laser-line frequencies after the peak search is Queries the array of laser-line wavelengths after the peak searchPEXCursion SyntaxAttribute SummaryPOINts? PTHResholdNon-sequential command SyntaxNon-sequential command PWAVerageSTATe“Defining Laser- Line Peaks” on page 2 CALCulate2 Subsystem WLIMitSTATe Non-sequential commandSyntax AttributeWLIMitSTARtFREQuency Non-sequential commandWLIMitSTARtWAVelength Non-sequential commandSyntax AttributeWLIMitSTARtWNUMber Non-sequential commandSyntax AttributeWLIMitSTOPFREQuency Non-sequential commandSyntax AttributeWLIMitSTOPWAVelength Non-sequential commandSyntax AttributeWLIMitSTOPWNUMber Non-sequential commandSyntax AttributeCALCulate3 Subsystem WAVelength? FREQuency? WNUMber? POWer? POWer WAVelength? FREQuency? STATE FWHM WAVelength? FREQuency? WNUMber? MEAN WAVelength?FREQuency? WNUMber? MODE WAVelength? FREQuency? WNUMber? PEAK WNUMber? SIGMa WAVelength? FREQuency? WNUMber?ASNRCLEar SyntaxAttribute SummaryASNRCOUNt SyntaxAttribute SummaryASNRSTATe tion on selecting measurementsDATA? Queries the array of laser-line frequencies after the calculation isQueries the array of laser-line wavelengths after the calculation is Queries the array of laser-line wave numbers after the calculationDELTaPOWerSTATe DELTaPRESetSyntax AttributeDELTaREFerencePOWer? DELTaREFerenceFREQuencyDescription 181.6924 THzDELTaREFerenceWAVelength SyntaxAttribute SummaryDELTaREFerenceWNUMber SyntaxAttribute SummaryDELTaWAVelengthSTATe SyntaxAttribute SummaryDELTaWPOWerSTATe DRIFtDIFFerenceSTATe SyntaxAttribute SummaryDRIFtMAXimumSTATe SyntaxAttribute SummaryDRIFtMINimumSTATe SyntaxAttribute SummaryDRIFtPRESet DRIFtREFerenceRESetSyntax AttributeDRIFtREFerenceSTATe SyntaxAttribute SummaryDRIFtSTATe SyntaxAttribute SummaryFPERotSTATE FPERotFWHM?+5.47128800E-009 +6.93436400E+011FPERotMEAN? +1.53878000E-006+1.94824800E+014 +6.49865400E+003FPERotMODESPACing? ArgumentDescription WAVelengthFPERotPEAK? +1.54073400E-006+1.94577600E+014 +6.49041000E+003FPERotPOWer? WATTsdBm DBM watts WATTsFPERotSIGMa? ArgumentDescription WAVelengthPRESet POINts?Syntax AttributeSNRAUTO SyntaxAttribute SummarySNRREFerenceFREQuency SyntaxAttribute SummarySNRREFerenceWAVelength SyntaxAttribute SummarySNRREFerenceWNUMber SyntaxAttribute SummaryTurns the signal- to- noise calculation on and off Preset State offSNRSTATe RST State offCONFigure Measurement Instruction CONFigure Measurement InstructionDISPlay Subsystem MAXimum LEFT NEXT PREVious RIGHtGRAPhics STATe DISPlay SubsystemMARKerMAXimum MARKerMAXimumLEFTSyntax AttributeMARKerMAXimumNEXT MARKerMAXimumPREViousSyntax AttributeMARKerMAXimumRIGHt WINDowGRAPhicsSTATeSyntax AttributeFETCh Measurement Instruction FETCh Measurement InstructionHCOPy Subsystem IMMediateMEASure Measurement Instruction MEASure Measurement InstructionREAD Measurement Instruction READ Measurement InstructionSENSe Subsystem DEVice ELEVations MEDium OFFSet MAGNitudeSENSe CORRection DATA?CORRectionDEVice page 4CORRectionELEVation 0DescriptionNon-sequential command SyntaxCORRectionMEDium SyntaxAttribute SummaryCORRectionOFFSetMAGNitude SyntaxAttribute Summaryment of an instrument function. Refer to “Measurement Instructions” on pageDATA? for 30 or 40 secondsQuery Response The following string shows an example of the first few measurements returned by this query STATus Subsystem STATus SubsystemSTATus Subsystem OPERation QUEStionableCONDition?page 3 OPERation QUEStionableENABle SyntaxAttribute SummaryOPERation QUEStionableEVENt SyntaxQuery Response AttributeOPERation QUEStionableNTRansition SyntaxAttribute SummaryOPERation QUEStionablePTRansition SyntaxAttribute SummaryTable 4-18. Preset Values PRESetSYSTem Subsystem SYSTem SubsystemHEADers? ERRor SyntaxAttribute SummaryHELPHEADers? SyntaxAttribute SummarySYSTem Subsystem Table 4-19. Instrument Conditions 1 ofPRESet Table 4-19. Instrument Conditions 2 of SYSTem SubsystemSYSTem Subsystem VERSionTable 4-20. SCPI Version Numbers TRIGger Subsystem TRIGger SubsystemABORt SyntaxAttribute SummaryINITiateCONTinuous Non-sequential commandSyntax AttributeINITiateIMMediate Non-sequential commandSyntax AttributeUNIT Subsystem POWerUNIT Subsystem 4-108 Programming CommandsUNIT Subsystem Performance Tests Test 1. Absolute Wavelength AccuracyTest Sensitivity 5Performance Tests Calibration CycleTest 1. Absolute Wavelength Accuracy 5 Testbe damaged when total input power exceeds 18 dBm Test 1. Absolute Wavelength AccuracyTest 2. Sensitivity be damaged when total input power exceeds 18 dBmTest 3. Polarization Dependence be damaged when total input power exceeds 18 dBmProcedure Standard instruments flat contacting connectors Test 4. Optical Input Return LossProcedure Option 022 instruments angled contacting connectors and Regulatory Information”FC/APC patchcord loss Test 4. Optical Input Return LossProcedure Test 5. Amplitude Accuracy and LinearityPolarization sensitivity completely filled in Table 5-21. Linearity Data Values Desired PowerPower Meter Test 5. Amplitude Accuracy and LinearityPage Product Overview Specifications and Regulatory InformationLaser Safety Information 6 Calibration Cycle Specifications and Regulatory InformationSpecifications and Regulatory Information the wavelength difference between two signals that are simultaneously Definition of Termsduring manufacturing at 1523.488 nm, or 196.7804 THz presentthe polarization of the input signal is varied powerlaser lines present to accurately measure wavelength and power panel connector, and assumes the user’s connector is goodSpecifications-NORMAL Update Mode WavelengthSpecifications-NORMAL Update Mode 10 GHz 0.08 nm at 1550 nm, 0.06 nm at 1300 nmAmplitude SensitivitySelectivity Specifications-NORMAL Update ModeInput Return Loss Measurement Cycle TimeMeasurement Applications Specifications-NORMAL Update ModeSpecifications-FAST Update Mode FAST update mode unless noted. Refer to “Measurement rate” on page 2Specifications-FAST Update Mode WavelengthSpecifications-FAST Update Mode AmplitudeSensitivity SelectivitySpecifications-FAST Update Mode Input Return LossMeasurement Cycle Time Measurement ApplicationsOperating Specifications Operating SpecificationsOperating Specifications Laser Safety Information Please pay attention to the following laser safety warningsCompliance with Canadian EMC Requirements This ISM device complies with Canadian ICES-001Cet appareil ISM est conforme à la norme NMB-001 du Canada Notice for Germany Noise DeclarationDeclaration of Conformity Declaration of ConformityProduct Overview Product OverviewFront view of instrument Rear view of instrument 6-16 Specifications and Regulatory InformationProduct Overview Instrument Preset Conditions Error MessagesAgilent Technologies Service Offices ReferenceInstrument Preset Conditions Table 5-22. Instrument Preset Conditions 1 ofSettings after Preset Settings after PowerTable 5-22. Instrument Preset Conditions 2 of Settings after PowerInstrument Preset Conditions Settings after PresetMenu Maps Menu MapsAppl’s Menu Menu MapsDisplay List by Power Menu Display Avg WL MenuMeasurement Cont Menu There is no menu associated with this keyDisplay List by WL Menu Delta On Menu Menu MapsDelta Off Menu Display Peak WL and System Preset Menus Measurement Single MenuThere is no menu associated with this key Menu MapsSystem Print Menu Menu MapsSystem Setup Menu Menu MapsError Messages Table 5-23. Instrument Specific Error Messages 1 ofTable 5-23. Instrument Specific Error Messages 2 of Error MessagesError Number Error MessageTable 5-23. Instrument Specific Error Messages 3 of Error MessagesError Number Error MessageTable 5-24. General SCPI Error Messages 1 of Error MessagesError Number DescriptionTable 5-24. General SCPI Error Messages 2 of Error MessagesError Number DescriptionTable 5-24. General SCPI Error Messages 3 of Error MessagesError Number DescriptionFront-Panel Fiber-Optic Adapters Front-Panel Fiber-Optic AdaptersFront Panel DescriptionPower Cords Agilent Technologies Service OfficesPower Cords Plug TypeAgilent Technologies Service Numbers Agilent Technologies Service OfficesPage Numerics IndexIndex Index Index-3Index Index-4Index Index-5Index Index-6Index Index-7Page Page Second edition, August 86120-90C03 Agilent Technologies Agilent Technologies GmbH Printed in Germany August