JDS Uniphase RM3750 user manual Command Action

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RM3 SERIES BACKREFLECTION METER

USER’S MANUAL

On power-up, the RTS and DTR signals on the interface connector go positive, indicating that the interface is ready to communicate. The software on the controlling computer must enable the RTS line. The interface controller waits for the CTS line to go positive before the measurements are transmitted. The DCD line must go positive in order for the controlling computer to receive commands from the meter.

The meter responds to single character commands sent on the serial interface. The characters must be sent individually, without a message terminating sequence such as <CR> (carriage return) or <LF> (line feed). The meter acknowledges each character that is sent with a character or a measurement reading.

The command G initiates the transmission of a measurement. The meter returns the most recent measurement. The transmission also includes the wavelength at which the measurement was made and the characters <CR> <LF>.

The character commands that control the meter via the RS232 serial interface port are listed in Table 9. When a command is accepted, the letter Y is returned. When a command is not recognized or not accepted, the letter X is returned.

Table 9: Character Commands

Command

Action

 

 

B

Display backreflection

 

 

A

Display absolute power

 

 

R

Display relative power

 

 

S

Store BR0 1

 

 

C

Clear BR01

 

 

D

Store ID 2

 

 

0

Set relative power to zero3

 

 

3

Set wavelength to the laser connected to the first LED

 

on display (eg. Model RM3750, first laser=1310nm. See

 

Figure 3)

 

 

5

Set wavelength to the laser connected to the second

 

LED on display (eg. Model RM3750, second

 

laser=1550nm. See Figure 3)

 

 

1Valid in Backreflection mode only.

2Valid in Absolute Power and Relative Power modes only.

3Valid in Relative Power mode only.

10112341 Rev 002

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Contents RM3 Series Backreflection Meter User’s ManualContents Customized Features and Test Data Programming GuideSafety Information, Instructions, and Symbols Safety InformationClass Laser Product Operating the Unit Safety InstructionsBefore Initializing and Operating the Unit RM3 Series Backreflection Meter USER’S Manual Proceeding Safety SymbolsSymbol FDA-CDRH Compliance CSA / IEC Compliance ComplianceCE Compliance RM3 Series Backreflection Meter USER’S Manual General Information and Specifications General InformationLoss and Power Measurements Backreflection MeasurementsInternal Light Sources Key FeaturesOutput Port Hybrid JumpersApplications Standard AccessoriesOptional Accessories Specifications Parameter Specification Single-mode MultimodeFlexcor is a trademark of CorningR Environmental ElectricalPhysical Initial Inspection Getting StartedBefore Initializing and Operating the Unit Operating Environment Storing and ShippingCleaning Connectors Powering Up the Meter Connector Cleaning connector type can varyKey/LED Description Operating and Maintenance InstructionsFront Panel Component Function Rear PanelTermination Techniques Termination Techniques for Single-mode Fiber except 980 nmMeasuring Backreflection for Single-mode except 980 nm Setting Up the Meter for Backreflection Measurements Backreflection MeasurementsMeasuring Backreflection Backreflection Accuracy and Range Loss and Power MeasurementsSetting Up the Meter for Loss and Power Measurements Measuring Power Loss and Power MeasurementsMeasuring Relative Power Insertion Loss Measuring Absolute PowerPower Accuracy Data Logging Using the Foot PedalMessages and Symbols Display DescriptionCalibrating the Meter StabilizingBackreflection Calibration Adjustment Power Calibration AdjustmentMaintaining the Meter Cleaning the UnitCleaning the Connector Ends Troubleshooting Recharging the BatteryReplacement of Internal Fuses Loss Before the DUT Front Panel ConnectorsLong Cables for single mode model only, except 980 nm model Reflections Before the DUTCalibration Other Display Problem SolutionLaser Stability Up the Meter for BackreflectionProgramming Guide RS232 Interface SpecificationsName Symbol Pin Number Signal Direction RS232 Serial InterfaceCommand Action Right Dip Switch Left Dip SwitchSwitch Setting Meaning RS232-GPIB ConverterProgramming Examples RS232 Interface Program ExampleCustomized Features and Test Data

RM3750 specifications

The JDS Uniphase RM3750 is a cutting-edge optical spectrum analyzer that has garnered attention in various telecommunications and photonics applications. Renowned for its versatility and accuracy, the RM3750 combines advanced technologies to provide users with unprecedented measurement capabilities, making it an essential tool for researchers and engineers working in fiber optics, laser development, and spectral analysis.

One of the standout features of the RM3750 is its wide dynamic range. This feature allows users to obtain precise measurements across a broad spectrum of optical signals, which is crucial in environments where signal strength can vary significantly. The analyzer is designed to handle both high-intensity signals and weak optical events, ensuring that no detail is missed during analysis.

The RM3750 incorporates a high-resolution detection mechanism that enables it to distinguish closely spaced wavelengths. This characteristic is particularly beneficial in applications where wavelength spacing is minimal, such as in dense wavelength division multiplexing (DWDM) systems. The high resolution also allows for accurate characterization of spectral features, including signal peaks and noise.

In addition to its impressive measurement capabilities, the RM3750 supports advanced analysis and real-time monitoring. Users can visualize spectral data through an intuitive graphical interface, which aids in the quick interpretation of results. The instrument is equipped with real-time data processing capabilities, allowing users to observe changes in optical signals as they occur, a critical feature for dynamic environments like live signal monitoring.

The JDS Uniphase RM3750 is not only about hardware; it also comes with an array of software tools designed to enhance functionality and ease of use. These tools allow for automated measurements, data logging, and integration with other laboratory instruments. Moreover, the ability to export data in various formats facilitates easy sharing and analysis across platforms.

Another notable characteristic of the RM3750 is its compact design and robust build quality. This ensures that it can operate effectively in demanding laboratory conditions while being portable enough for field applications.

In conclusion, the JDS Uniphase RM3750 optical spectrum analyzer stands out for its combinations of wide dynamic range, high resolution, real-time monitoring, and user-friendly software integration. These characteristics make it an exceptional tool for professionals in telecommunications and optical research, enabling them to conduct more accurate and insightful measurements.
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