Internal Backreflection (for single mode model only, except 980 nm model)
Connector Loss and Backreflection

RM3 SERIES BACKREFLECTION METER

USER’S MANUAL

Loss Before the DUT

￿When a DUT is connected to the RM meter, the loss from connectors before the DUT affects the backreflection reading. Because the light is going out from the RM meter and then returning, it goes through the connectors twice, so the effect of the loss is doubled. If the loss is close to 0.15 dB, its effect is compensated automatically by the meter. If the loss differs substantially from 0.15 dB, follow the measurement procedures described at the end of the Measuring Backreflection section.

Reflections Before the DUT

￿When a device is connected to the RM meter, the reflections from the connectors affect the backreflection reading. The front panel FC/PC connections must have backreflection levels lower than -45 dB for single mode (-25 dB for multi mode), and FC/APC connections must have backreflection levels lower than -60 dB for single mode (-40 dB for multi mode). To ensure that the RM meter automatically compensates for this backreflection, follow the setup procedure described in the Setting Up the Meter for Backreflection Measurements section, and ensure that the backreflections do not change from the time of the setup.

Reflections After the DUT

￿When making a backreflection measurement, the fiber after the DUT must be terminated to eliminate the reflections from the end of the fiber (see the Termination Techniques section). For greatest accuracy when making very low backreflection measurements, terminate near the DUT to eliminate reflections from the fiber itself.

Front Panel Connectors

Follow the maintenance procedure described in the Maintaining the Meter section, to ensure that the internal pigtail connectors are clean and properly connected to the front panel mating sleeve.

Ensure that the loss and backreflection of all the connectors are low and stable, complying with the connector specifications.

To confirm proper operation of the RM meter, terminate the internal cable while using the factory-set BR0 value (BR0 key lamp is off). The backreflection reading must be less than ￿-65 dB.

Long Cables (for single mode model only, except 980 nm model)

Terminate the cables near the devices or connectors being tested in order to eliminate backreflections from the fiber.

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JDS Uniphase RM3750 Loss Before the DUT, Reflections Before the DUT, Reflections After the DUT, Front Panel Connectors
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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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