AQ7421 High-Resolution Reflectometer

The AQ7421 precisely identifies both the location and magnitude of reflections within optical connectors and modules, revealing microcracks or misalignments that standard loss measurements often miss. Unlike conventional OCWR methods, it makes previously undetectable defects visible, helping to prevent unpredictable failures.

Compared with OFDR-based reflectometers, the AQ7421 delivers sharper, spurious-free waveforms, making it ideally suited for high-precision inspection. These capabilities are particularly valuable for reliability testing of components subjected to prolonged high-temperature operation, where hidden defects can cause premature failure. When paired with the optional sensor head unit, it can also measure insertion loss simultaneously, providing a versatile solution for both R&D and production environments.

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Overview
Details

Overview
Details

Spurious noise reduction

With some conventional reflectometers, spurious noises may falsely appear in areas where there is no actual reflection. Waveform analysis often requires that users have specialized knowledge of this sort of phenomena. The AQ7421 greatly reduces spurious noises and simplifies analysis.

Measurement distance: 1000 mm (approx. 40 inches)
Spatial resolution: 40 μm
Spurious noise: −100 dB avoids false (ghost) effects

Simultaneous measurement of multiple reflection and Insertion loss

Traditionally, reflectometers have been inadequate for inspection of reflection attenuation due to poor measurement accuracy of the vertical axis (back reflection). The AQ7421 enables measurement with an uncertainty of ±3dB, and using the optical sensor head, connector connection loss can be measured simultaneously with an uncertainty of ±0.02 dB.

Multi-Fiber Measurement

By combining with the AQ740027 Multi Switch Unit, multi-core measurement becomes available.
Channel switching time: 1 sec
Channel switching repeatability: ±0.02 dB
Insertion loss: ≤ 2.6 dB

Expanded Measurement Range

By combining with the AQ740051 Expander Unit, the measurement range can be extended up to 8000 mm.
Channel switching time: 2 sec
Channel switching repeatability: ±0.04 dB
Insertion loss: ≤ 4.8 dB

Applications
Accessories

Applications
Accessories

RL and IL Measurement in One Step

By combining the AQ7420/AQ7421 with the AQ740023 Sensor Head, users can automatically measure both return loss and insertion loss at two wavelengths simultaneously with a single system. With its spurious-free and high-sensitivity performance, the system clearly distinguishes reliable products (absence of reflection peaks) from defective ones (reflection peaks present). The control software also issues inspection reports to streamline quality management.

RL and IL Measurement in One Step

Dual-Wavelength RL and IL Measurement for Multi-Fiber Devices

When paired with the AQ740027, the AQ7420/AQ7421 enables automatic inspection of multiple fibers and devices such as splitters.
It can measure return loss and insertion loss simultaneously across multiple ports. This eliminates the need for manual reconnections or switching, allowing multiple ports to be tested with a single button press for maximum efficiency.

Distance

Component Position and Reflection Analysis in Optical Devices

Optical device

With high spatial resolution, spurious-free operation, and sharp waveforms, the AQ7421 precisely identifies component positions inside optical devices and measures the reflected light generated at their edges.

Component Position and Reflection Analysis in Optical Devices

Failure Location Analysis across Long Test Distances

By combining the AQ7421 with the AQ740051 Expander Unit, the measurement range can be extended up to 8 m. This capability enables accurate fault location and inspection for short fiber assemblies and integrated photonic devices that exceed 1 m in length but remain unsuitable for long-haul OTDR testing.

Failure Location Analysis across Long Test Distances