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Agilent Technologies Agilent 86120C manual Automatic interpolation, Repetitive data formats

Models: Agilent 86120C

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Automatic interpolation

Making Measurements

Measuring Signal-to-Noise Ratios

Automatic interpolation

User- entered When the signal- to- noise “user” function is selected, the

wavelength Agilent 86120C uses only one wavelength to measure the noise power for all signals. This wavelength is set by the user and all signals are compared to the noise level at this wavelength to determine their cor- responding signal- to- noise ratios.

Noise bandwidth When measuring noise power, the Agilent 86120C must account for the noise bandwidth used during the measurement. Because noise band- width varies with measurement bandwidth (a wide bandwidth allows more noise to the Agilent 86120C’s detector than a narrow bandwidth), the Agilent 86120C normalizes all noise power measurements to a bandwidth of 0.1 nm. The annotation 0.1 nm is displayed to show that the noise bandwidth is being normalized to a 0.1 nm bandwidth.

Repetitive data formats

The Agilent 86120C signal-to-noise application works best when the laser being tested is not modulated, or modulated with non-repetitive data formats. With repetitive data formats, such as PRBS data and SONET formats, there is signifi- cant low-frequency amplitude modulation of the laser. This modulation raises the noise floor of the Agilent 86120C significantly. The signal-to-noise measured can be limited to about 15 dB while measuring lasers modulated by repetitive data for- mats. For improved performance when the laser is modulated with repetitive data formats, use the Signal-to-Noise with Averaging application.

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Agilent Technologies Agilent 86120C manual Automatic interpolation, Repetitive data formats

Contents

Agilent 86120C Multi-Wavelength Meter User’s Guide Notices angled physical contact interface The Agilent 86120C-At a GlanceCharacterize laser lines easily Program the instrument for automatic measurements “Programming” and Chapter 4, “Programming Commands” provide allmust not be exceeded Print measurement resultsThe 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 Returning the Instrument for Service ContentsThe Agilent 86120C-At a Glance General Safety Considerations Step 2. Connect the Line-Power Cable 5 Step 3. Connect a PrinterTest 1. Absolute Wavelength Accuracy 3 Test 2. Sensitivity Laser Safety InformationInstrument Preset Conditions FETCh Measurement Instruction 79 HCOPy SubsystemContents-3 Menu Maps Error Messages Front-Panel Fiber-Optic Adapters Power CordsAgilent Technologies Service Offices ContentsPage 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 ShipmentWA R N I N G Step 2. Connect the Line- Power CableC 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 Getting Started Returning the Instrument for Service1-14 Getting Started Returning the Instrument for Service1-15 Page Measuring Total Power Greater than 10 dBm Measuring Wavelength and PowerMeasuring Signal- to- Noise Ratios Measuring Signal- to- Noise Ratios with AveragingAgilent 86120C, refer to “Calibrating Measurements” on page 2 Making MeasurementsGraphical display of optical power spectrum 2 Instrument states 2 Measuring Wavelength and PowerPeak WL mode 2 List by WL or Power modes 2 Total power and average wavelength 2Peak WL mode To display peak wavelength and powerNEXT PK to select next higher power signal 3 To move the cursor to view other signals, pressPEAK to signal with greatest power PREV PK to select next lower power signalTo display multiple laser lines List by WL or Power modesTotal power and average wavelength n is the number of laser lines included in the measurement To display average wavelength and total powerLimiting the wavelength measurement range To limit the wavelength rangeTo measure broadband devices Measuring broadband devices and chirped lasersTo see the graphical display Graphical display of optical power spectrumTo save an instrument state Power barTo control the power bar Instrument statesDisplayed units 2 Measurement rate Changing the Units and Measurement RateDisplayed units To change the units of measureMeasurement rate To change the measurement speed Continuous or single measurementsTo select single measurement acquisition Defining Laser- Line Peaks To define laser- line peaks If too many lines are identified Channel separation 2 Measuring flatness 2 Measuring Laser SeparationThis 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 select the medium for light To enter the elevationConverting 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 Connectorsleave filmy deposits on fiber ends that can degrade performance To clean a non- lensed connectormanufacturer for information on application and cleaning procedures think the use of such compounds is necessary, refer to the compoundcompressed air canister To clean an adapter2 Clean the adapter with the foam swab Making Measurements Lists of Commands 3Programming Addressing and Initializing the Instrument 3Types of commands Where to begin…Programming Remote mode and front- panel lockout Addressing and Initializing the InstrumentInitialize 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 page Table 2-4. Commands for Capturing DataMaking Measurements Refer to “FPERotSTATE” onMeasurement 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 Data can be corrected for elevation and vacuum The format of returned dataMeasurements are returned as strings Determine the number of data pointsMonitoring the Instrument Monitoring the InstrumentStatus Byte register Status registersMonitoring the Instrument Programming3-18 Table 3-6. Bits in Operation Status Register OPERation Status and QUEStionable Status registersStandard Event Status register Enabling register bits with masks Queues Error queueOutput queue Use either short or long forms SCPI command are grouped in subsystemsSending a command Reviewing SCPI Syntax RulesYou can use upper or lowercase letters Combine commands in the same subsystemWhite space Combine commands from different subsystemsSending common commands Adding parameters to a commandMnemonic 0.28E2 280E-1 28000m 0.028K 28E-3KTable 3-9. Suffix Multipliers MultiplierQuerying data Program message terminatorSetese subroutine Errormsg subroutineExample Programs Many subroutines are repeated in the examplesTempo subroutine FNIdentity functionErrmngmt subroutine Cmdopc subroutinePRINT Errmsg$ Example 1. Measure a DFB laserCOM /Instrument/ @Mwm DIM Errmsg$255 INTEGER Cme CLEAR REPEAT OUTPUT @Mwm*ESR? ENTER @MwmCme OUTPUT @MwmSYSTERR? ENTER @MwmErrmsg$ENTER @MwmIdentity$ RETURN Identity$ Example ProgramsCOM /Instrument/ @MwmV DIM Identity$50 Identity$= OUTPUT @Mwm*RST OUTPUT @Mwm*OPC? ENTER @MwmOpcdone OUTPUT @Mwm*IDN?Example Programs Example 2. Measure WDM channelsCOM /Instrument/ @Mwm OUTPUT @Mwm *ESEIVAL00110100,2 Example ProgramsPRINT Errmsg$ UNTIL NOT BITCme,2 AND NOT BITCme,4 AND NOT BITCme,5 AND Err$,+0Turn on drift reference state Example 3. Measure WDM channel driftTurn on the drift calculation Turn off all drift statesTurn on drift max min calculation Query reference wavelengths and powersExample Programs Turn off drift reference stateSUBEND IdentityDEF FNIdentity$ ProgrammingExample Programs SubendSUBEND SeteseSUB SetesePRINT 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 channelFOR I=1 TO Nbpt NEXT STOP ErrormsgProgramming Example ProgramsExample 6. Increase a source’s wavelength accuracy OUTPUT @MwmMEASSCALPOWWAV? ENTER @MwmCurrentwl Example ProgramsTable 3-10. Programming Commands 1 of Lists of CommandsLists 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 CommandsLists of Commands Table 3-11. Keys Versus Commands 1 of∆ WL Lists of Commands Table 3-11. Keys Versus Commands 2 ofProgramming Lists of Commands3-50 CALCulate2 Subsystem 4 CALCulate3 Subsystem 4 Programming CommandsCommon Commands 4 Measurement Instructions 4 CALCulate1 Subsystem 4 CONFigure Measurement Instruction 4 DISPlay Subsystem 4Table 4-12. Notation Conventions and Definitions Programming CommandsProgramming Commands Common Commands Example Query ResponseExample ESR?Syntax*ESR? Query ResponseIDN? Page Syntax*RST Table 4-15. Conditions Set by *RST Reset 2 of Page Query Response In this example, the command enables ESB event summary bit 5 inthe status byte register to generate a service request Common CommandsSTB? TST? Syntax*WAI Measurement Instructions Measurement InstructionsMeasurement Instructions POWer? FREQuency? WAVelength? WNUMber?The commands in this subsystem have the following command hierar- chy MEASure READ? FETCh? CONFigure? ARRay SCALarCONFigure 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?Query Response resolutionConstants Examplesexpectedvalue MAXimum MEASureARRay SCALar POWerWNUMber?CONFigure command SyntaxIf the MEASSCALPOWWNUM? 6451 command is sent, and a FREQuency POINts CALCulate1 Subsystemtions” on page 4 DATA?or, 1557.137 nm in vacuum CALCulate1 Subsystem TRANsformFREQuencyPOINts Non-sequential commandthat is located in “Making Measurements” on page 3- 5 . Changing the +7,525 For normal updateFor fast update +15,047WNUMber CALCulate2 SubsystemSTATe STATe STARt FREQuency WAVelength WNUMber STOP FREQuency WAVelengthQueries the array of laser-line wavelengths after the peak search completed. If CALC2PWAVSTAT is on, the total input power isDATA? Queries the array of laser-line frequencies after the peak search isSummary PEXCursionSyntax AttributeSyntax POINts?PTHReshold Non-sequential command“Defining Laser- Line Peaks” on page 2 PWAVerageSTATeNon-sequential command CALCulate2 Subsystem Attribute WLIMitSTATeNon-sequential command SyntaxNon-sequential command WLIMitSTARtFREQuencyAttribute WLIMitSTARtWAVelengthNon-sequential command SyntaxAttribute WLIMitSTARtWNUMberNon-sequential command SyntaxAttribute WLIMitSTOPFREQuencyNon-sequential command SyntaxAttribute WLIMitSTOPWAVelengthNon-sequential command SyntaxAttribute WLIMitSTOPWNUMberNon-sequential command SyntaxCALCulate3 Subsystem WNUMber? SIGMa WAVelength? FREQuency? WNUMber? WAVelength? FREQuency? WNUMber? POWer? POWer WAVelength? FREQuency?STATE FWHM WAVelength? FREQuency? WNUMber? MEAN WAVelength? FREQuency? WNUMber? MODE WAVelength? FREQuency? WNUMber? PEAKSummary ASNRCLEarSyntax AttributeSummary ASNRCOUNtSyntax Attributetion on selecting measurements ASNRSTATeQueries the array of laser-line wave numbers after the calculation DATA?Queries the array of laser-line frequencies after the calculation is Queries the array of laser-line wavelengths after the calculation isAttribute DELTaPOWerSTATeDELTaPRESet Syntax181.6924 THz DELTaREFerencePOWer?DELTaREFerenceFREQuency DescriptionSummary DELTaREFerenceWAVelengthSyntax AttributeSummary DELTaREFerenceWNUMberSyntax AttributeSummary DELTaWAVelengthSTATeSyntax AttributeDELTaWPOWerSTATe Summary DRIFtDIFFerenceSTATeSyntax AttributeSummary DRIFtMAXimumSTATeSyntax AttributeSummary DRIFtMINimumSTATeSyntax AttributeAttribute DRIFtPRESetDRIFtREFerenceRESet SyntaxSummary DRIFtREFerenceSTATeSyntax AttributeSummary DRIFtSTATeSyntax Attribute+6.93436400E+011 FPERotSTATEFPERotFWHM? +5.47128800E-009+6.49865400E+003 FPERotMEAN?+1.53878000E-006 +1.94824800E+014WAVelength FPERotMODESPACing?Argument Description+6.49041000E+003 FPERotPEAK?+1.54073400E-006 +1.94577600E+014watts WATTs FPERotPOWer?WATTs dBm DBMWAVelength FPERotSIGMa?Argument DescriptionAttribute PRESetPOINts? SyntaxSummary SNRAUTOSyntax AttributeSummary SNRREFerenceFREQuencySyntax AttributeSummary SNRREFerenceWAVelengthSyntax AttributeSummary SNRREFerenceWNUMberSyntax AttributeRST State off Turns the signal- to- noise calculation on and offPreset State off SNRSTATeCONFigure Measurement Instruction CONFigure Measurement InstructionDISPlay Subsystem DISPlay SubsystemMAXimum LEFT NEXT PREVious RIGHt GRAPhics STATeAttribute MARKerMAXimumMARKerMAXimumLEFT SyntaxAttribute MARKerMAXimumNEXTMARKerMAXimumPREVious SyntaxAttribute MARKerMAXimumRIGHtWINDowGRAPhicsSTATe SyntaxFETCh Measurement Instruction FETCh Measurement InstructionIMMediate HCOPy SubsystemMEASure Measurement Instruction MEASure Measurement InstructionREAD Measurement Instruction READ Measurement InstructionDATA? SENSe SubsystemDEVice ELEVations MEDium OFFSet MAGNitude SENSe CORRectionpage 4 CORRectionDEViceSyntax CORRectionELEVation0Description Non-sequential commandSummary CORRectionMEDiumSyntax AttributeSummary CORRectionOFFSetMAGNitudeSyntax Attributefor 30 or 40 seconds ment of an instrument function. Refer to “Measurement Instructions”on page DATA?Query Response The following string shows an example of the first few measurements returned by this query STATus Subsystem STATus Subsystempage 3 OPERation QUEStionableCONDition?STATus Subsystem Summary OPERation QUEStionableENABleSyntax AttributeAttribute OPERation QUEStionableEVENtSyntax Query ResponseSummary OPERation QUEStionableNTRansitionSyntax AttributeSummary OPERation QUEStionablePTRansitionSyntax AttributePRESet Table 4-18. Preset ValuesHEADers? SYSTem SubsystemSYSTem Subsystem Summary ERRorSyntax AttributeSummary HELPHEADers?Syntax AttributePRESet Table 4-19. Instrument Conditions 1 ofSYSTem Subsystem SYSTem Subsystem Table 4-19. Instrument Conditions 2 ofTable 4-20. SCPI Version Numbers VERSionSYSTem Subsystem TRIGger Subsystem TRIGger SubsystemSummary ABORtSyntax AttributeAttribute INITiateCONTinuousNon-sequential command SyntaxAttribute INITiateIMMediateNon-sequential command SyntaxUNIT Subsystem POWerUNIT Subsystem UNIT Subsystem Programming Commands4-108 Sensitivity 5 Performance TestsTest 1. Absolute Wavelength Accuracy TestTest Performance TestsCalibration Cycle Test 1. Absolute Wavelength Accuracy 5Test 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 lossPolarization sensitivity Test 5. Amplitude Accuracy and LinearityProcedure completely filled in Test 5. Amplitude Accuracy and Linearity Table 5-21. Linearity Data ValuesDesired Power Power MeterPage Laser Safety Information 6 Specifications and Regulatory InformationProduct Overview Specifications and Regulatory Information Specifications and Regulatory InformationCalibration Cycle present the wavelength difference between two signals that are simultaneouslyDefinition of Terms during manufacturing at 1523.488 nm, or 196.7804 THzpanel connector, and assumes the user’s connector is good the polarization of the input signal is variedpower laser lines present to accurately measure wavelength and power10 GHz 0.08 nm at 1550 nm, 0.06 nm at 1300 nm Specifications-NORMAL Update ModeWavelength Specifications-NORMAL Update ModeSpecifications-NORMAL Update Mode AmplitudeSensitivity SelectivitySpecifications-NORMAL Update Mode Input Return LossMeasurement Cycle Time Measurement ApplicationsWavelength Specifications-FAST Update ModeFAST update mode unless noted. Refer to “Measurement rate” on page 2 Specifications-FAST Update ModeSelectivity Specifications-FAST Update ModeAmplitude SensitivityMeasurement Applications Specifications-FAST Update ModeInput Return Loss Measurement Cycle TimeOperating Specifications Operating SpecificationsOperating Specifications Please pay attention to the following laser safety warnings Laser Safety InformationNotice for Germany Noise Declaration Compliance with Canadian EMC RequirementsThis ISM device complies with Canadian ICES-001 Cet appareil ISM est conforme à la norme NMB-001 du CanadaDeclaration of Conformity Declaration of ConformityFront view of instrument Rear view of instrument Product OverviewProduct Overview Product Overview Specifications and Regulatory Information6-16 Reference Instrument Preset ConditionsError Messages Agilent Technologies Service OfficesSettings after Power Instrument Preset ConditionsTable 5-22. Instrument Preset Conditions 1 of Settings after PresetSettings after Preset Table 5-22. Instrument Preset Conditions 2 ofSettings after Power Instrument Preset ConditionsMenu Maps Menu MapsMenu Maps Appl’s MenuThere is no menu associated with this key Display List by Power MenuDisplay Avg WL Menu Measurement Cont MenuMenu Maps Display List by WL Menu Delta On MenuMenu Maps Delta Off Menu Display Peak WL and System Preset MenusMeasurement Single Menu There is no menu associated with this keyMenu Maps System Print MenuMenu Maps System Setup MenuTable 5-23. Instrument Specific Error Messages 1 of Error MessagesError Message Table 5-23. Instrument Specific Error Messages 2 ofError Messages Error NumberError Message Table 5-23. Instrument Specific Error Messages 3 ofError Messages Error NumberDescription Table 5-24. General SCPI Error Messages 1 ofError Messages Error NumberDescription Table 5-24. General SCPI Error Messages 2 ofError Messages Error NumberDescription Table 5-24. General SCPI Error Messages 3 ofError Messages Error NumberDescription Front-Panel Fiber-Optic AdaptersFront-Panel Fiber-Optic Adapters Front PanelPlug Type Power CordsAgilent Technologies Service Offices Power CordsAgilent Technologies Service Offices Agilent Technologies Service NumbersPage Index NumericsIndex Index-3 IndexIndex-4 IndexIndex-5 IndexIndex-6 IndexIndex-7 IndexPage Page  Agilent Technologies GmbH Printed in Germany August Agilent TechnologiesSecond edition, August 86120-90C03