AN-116 Performing ILRL Measurements Using a Single-Channel OP940

AN-116 Performing Insertion Loss and Return Loss Measurements Using a Single-Channel OP940

Overview

OptoTest’s OP940 allows operators to test Insertion Loss and Return Loss of fiber optic cables accurately and efficiently. Once Insertion Loss and Return Loss references are completed, the unit will automatically update test results on the screen in real-time.

Performing a Reference Measurement

Return Loss Reference

The OP940 references Return Loss by searching for the first large reflection in the reference cable. After such a reflection is found, measurements begin at a distance from the front panel to the unmated end of the cable. It is recommended that an unmated PC connector be used for RL reference (for more information see our White Paper) and that the number of connections between the front panel and the reference connector be minimized to reduce loss and reflectors to the OP940 front panel. The open PC connector should yield approximately 14dB reflection.

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AN-111 Measuring Insertion Loss and Return Loss on Hybrid Cables

AN-111 Measuring IL/RL on Hybrid Cables

Overview

Testing simplex cables with unmatched connector types poses difficulties because the cable cannot simply be turned around to test the reverse direction. While hybrid bulkheads (SC-FC, ST-FC, etc.) are one option that can solve the problem with only minor issues, in some circumstances hybrid bulkheads will not provide sufficiently accurate measurements. SC-LC cables are one such example. SC-LC bulkheads have high loss and poor repeatability and, as a result, they should not be used in the testing process. Using an OP940 with two detector ports coupled with an OP725 will allow the operator to accurately test hybrid cables of all configurations with the highest accuracy possible.

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AN-137 Preventing Damage to Optical Connectors

AN-137 Preventing Damage to Optical Connectors

Effects of Damaged Front Panels

"Dirt

Maintaining your equipment’s interface & connectors is absolutely critical to achieving quality results. Damaged instrumentation interfaces and reference cables can add loss and reflections as well as reduce stability, making it difficult to take accurate measurements. In addition to adhering to strict policies regarding cleaning and inspection, one way to maintain instrumentation interfaces and reference cords is to use SAVer cables and extension leads.

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AN-128 Ensuring Accurate Return Loss Measurement

AN-128 Ensuring Accurate Return Loss Measurement

Overview

As fiber optic networks move towards higher data rates and lower loss, connectors with increased performance (low insertion and return loss) have become the standard.  Return loss requirements on connectors have begun to approach the physical limitations of the polishing process and, as such, any error in the measurement can cause poor connectors to pass or good connectors to fail.

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AN-112 Testing Insertion Loss and Return Loss on Ribbon Fiber Fanouts with OPL-MAX

AN-112 Testing Insertion Loss and Return Loss on Ribbon Fiber Fanouts with OPL-MAX

Overview

Measuring Insertion Loss and Return Loss on Ribbon Fiber Fanouts, like the MTP® to LC cable shown in figure 1 below, can be a streamlined process when using the right equipment and automation software.

For the methods described in this Application Note, only a multichannel IL/RL Tester (OP940) fitted with large area detector (RIN) or integrating sphere (OP-SPHR) is needed. This setup can greatly reduce testing time and inaccuracies caused by additional reference cables and multiple detectors. For even further efficiency in testing, using OPL-MAX software will automate and store all test results.

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AN-140 RL Testing for APC Terminated Cables using the OP940 Front Panel

AN-140 SRL Testing for APC Terminated Cables using the OP940 Front Panel

Overview

The OP940 was designed as an upgrade to the existing OP930 product line. One of the many additional features is the ability to reference to an angle polished connector through the front panel of the unit. The new feature works by searching for small reflections that the unit would normally bypass. If, after following the instructions below, the unit is unable to reference to the APC connector on the reference cable, it is advised to employ the methods detailed in AN-114 RL Testing for APC Terminated Cables.

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AN-132 SAVer Cable Short Instructions

AN-132 SAVer Cable Short Instructions

Overview

The SAVer cables are designed to ‘save’ the instrument front panel from dirt, scratches and potentially expensive repairs and downtime. When the SAVer cable is used with the high quality mating adapter, MAAD-FC, your front panels will stay clean without adding loss. The SAVer cable can be repolished or replaced quickly and easily.

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AN-125 Bend-Insensitive Multimode Fiber (BIMMF)

AN-125 Bend-Insensitive Multimode Fiber (BIMMF)

Overview

It is no secret that when standard optical fiber is bent, twisted, or otherwise contorted, it will exhibit increased loss. Until recently it was an accepted fact that in certain situations, such as in patch panels, cabinets, enclosures, and other places where space is limited or sharp corners or bends exist, there was a trade-off between how small these spaces could be and how long the cables would have to be without significant bend loss due to bending, twisting, or stretching. In 2009, however, a more durable, stress-resistant type of multimode cable was developed and it is revolutionizing fiber optics by allowing enclosures, patch-cabinets, and other types of cable hubs to be designed much more compact than was previously possible without introducing loss.

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AN-121 Stability Measurement Application for 500 Series Optical Power Meter / Sensor

AN-121 Stability Measurement – Application for 500 Series Optical Power Meter / Sensor

Overview

How does one measure the power stability of a light source and what are common pitfalls?

This application note describes how to setup the measurement with the OP500 series power meter modules. Data acquisition is controlled by a computer that runs OPL5 application software. The measurement results are illustrated with real-life data of a 980nm laser source.

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AN-113 Bidirectional MultiFiber Insertion and Return Loss Testing Using OP725-OP940 and Two OP720s

AN-113 Bidirectional MultiFiber Insertion and Return Loss Testing Using OP725-OP940 and Two OP720s

Overview

With 100G Ethernet and beyond quickly becoming the standard for the fiber optics communication industry, many cable manufacturers want to be able to test multifiber cables with relative speed and ease. Using an OP725-OP940 and two 1xN OP720 switches with OPL-MAX, an operator can test bidirectional insertion loss and return loss on high-fiber-count cables.

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