JDS Uniphase RM3750 user manual Loss and Power Measurements, Backreflection Accuracy and Range

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RM3 SERIES BACKREFLECTION METER

USER’S MANUAL

temperature. To ensure accurate backreflection measurements below -65 dB (-25 dB for multimode):

1. Perform the BR0 measurement at least once per shift.

The measured backreflection is affected by losses that can occur between the meter and the DUT. To compensate for these losses, measure the total amount of loss between the output of the measurement hybrid jumper and the input of the DUT (see the Loss and Power Measurements section). Double this value and add it to the backreflection value displayed on the meter. In the following example, the total loss between the meter and the DUT is 2.0 dB, and the displayed backreflection is -29 dB:

BR = -29 dB + (2 x 2.0 dB) = -25 dB

Backreflection Accuracy and Range

The absolute accuracy of backreflection measurements made with the meter is dependent on the level of backreflection to be measured.

The backreflection measurement range is restricted by the BR0 level. The meter can measure backreflection levels 15 dB below BR0 to a maximum of -75 dB (-40dB for multimode). For example, if BR0 is -40 dB, the minimum backreflection of the DUT that can be measured is -55 dB.

An asterisk (*) is displayed near the range limit (last 5 dB of range if using BR0, below -60 dB otherwise) to indicate that the setup and measurement procedures described in the previous two sections must be followed carefully to ensure accurate results.

Absolute accuracy specifications are dependent upon the accuracy of the RM meter calibration, so a calibration check needs to be performed periodically (see the Calibrating the Meter section).

Loss and Power Measurements

Setting Up the Meter for Loss and Power Measurements

To prepare the meter for loss and power measurements:

1.Ensure that the RM meter is powered off.

2.Set the power switch to ON, and allow the RM meter to stabilize.

3.Clean the output port on the front of the meter and the FC/APC connector (green boot) of the measurement jumper, and connect this end of the jumper to the output port. Ensure that you are using the measurement jumper and not the calibration jumper, which is labeled as such.

For each wavelength at which measurements are to be made:

4. Press the λ key to select the required wavelength.

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Contents User’s Manual RM3 Series Backreflection MeterContents Programming Guide Customized Features and Test DataSafety Information Safety Information, Instructions, and SymbolsClass Laser Product Safety Instructions Before Initializing and Operating the UnitOperating the Unit RM3 Series Backreflection Meter USER’S Manual Safety Symbols SymbolProceeding Compliance CE ComplianceFDA-CDRH Compliance CSA / IEC Compliance RM3 Series Backreflection Meter USER’S Manual General Information General Information and SpecificationsBackreflection Measurements Loss and Power MeasurementsHybrid Jumpers Key FeaturesOutput Port Internal Light SourcesStandard Accessories Optional AccessoriesApplications Parameter Specification Single-mode Multimode SpecificationsFlexcor is a trademark of CorningR Electrical PhysicalEnvironmental Getting Started Before Initializing and Operating the UnitInitial Inspection Storing and Shipping Operating EnvironmentCleaning Connectors Connector Cleaning connector type can vary Powering Up the MeterOperating and Maintenance Instructions Front PanelKey/LED Description Termination Techniques for Single-mode Fiber except 980 nm Rear PanelTermination Techniques Component FunctionMeasuring Backreflection for Single-mode except 980 nm Backreflection Measurements Setting Up the Meter for Backreflection MeasurementsMeasuring Backreflection Loss and Power Measurements Setting Up the Meter for Loss and Power MeasurementsBackreflection Accuracy and Range Loss and Power Measurements Measuring PowerMeasuring Absolute Power Measuring Relative Power Insertion LossDisplay Description Data Logging Using the Foot PedalMessages and Symbols Power AccuracyStabilizing Calibrating the MeterPower Calibration Adjustment Backreflection Calibration AdjustmentCleaning the Unit Cleaning the Connector EndsMaintaining the Meter Recharging the Battery Replacement of Internal FusesTroubleshooting Reflections Before the DUT Front Panel ConnectorsLong Cables for single mode model only, except 980 nm model Loss Before the DUTUp the Meter for Backreflection Other Display Problem SolutionLaser Stability CalibrationRS232 Serial Interface RS232 Interface SpecificationsName Symbol Pin Number Signal Direction Programming GuideCommand Action RS232-GPIB Converter Left Dip SwitchSwitch Setting Meaning Right Dip SwitchRS232 Interface Program Example Programming ExamplesCustomized 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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