Alcatel‑Lucent 938A Optical Loss Set – Portable Test & Measurement Kit

The Alcatel‑Lucent 938A Optical Loss Set is a compact, portable test instrument designed for field and laboratory measurement of optical fiber attenuation, connector loss, and overall link power budgets. This kit combines a stabilized light source and a high‑accuracy optical power meter, providing technicians with all the tools needed to verify the health of fiber optic cables, splices, and passive components.

Product Overview

The 938A set is widely used during installation, commissioning, and maintenance of both legacy and modern optical transport networks. It supports multiple wavelengths (typically 1310 nm and 1550 nm for single‑mode, and 850 nm and 1300 nm for multimode), allowing versatile testing across different fiber types. The instrument features a large backlit LCD for clear readings in low‑light environments, and its ruggedized casing protects it from drops and dust.

Measurement results include absolute power (dBm), relative loss (dB), and link loss with automatic wavelength identification (when used with compatible sources). The set also includes reference cables, adapters, and a carrying case for convenient transport.

Technical Specifications

• Product Name: Optical Loss Set

• Model: 938A

• Light Source Wavelengths: 1310 nm and 1550 nm (single‑mode); optional 850/1300 nm (multimode)

• Source Output Power: –7 dBm ± 0.5 dB (stabilized)

• Source Stability: ±0.05 dB over 8 hours

• Power Meter Wavelength Range: 800 nm – 1700 nm

• Power Meter Accuracy: ±0.2 dB (at reference conditions)

• Dynamic Range: –50 dBm to +23 dBm

• Resolution: 0.01 dB

• Connector Interface: Interchangeable adapters (FC, SC, ST, LC)

• Battery Life: > 20 hours (rechargeable Li‑ion)

• Operating Temperature: –10°C to +50°C

• Dimensions: 200 x 100 x 45 mm (handheld)

• Weight: 0.6 kg (including battery)

Key Features and Benefits

• Dual‑wavelength source and power meter in one unit for one‑way or two‑way testing.

• Automatic wavelength detection (when source emits identification tone) for error‑free measurements.

• Pass/fail threshold setting with audible alerts for quick go/no‑go testing.

• Data storage of up to 1000 measurements with timestamp.

• USB interface for data download and firmware updates.

• Rugged, splash‑resistant case for outdoor field use.

Deployment Scenarios

The 938A is used during fiber optic cable installation to verify splice loss, connector insertion loss, and total link attenuation. It is also essential for troubleshooting degraded links, identifying dirty or damaged connectors, and verifying that optical amplifiers and multiplexers are operating within specified loss budgets.

In data center environments, it helps certify fiber links for 10G, 40G, or 100G Ethernet by measuring end‑to‑end loss and ensuring compliance with IEEE standards.

Maintenance and Calibration

Alcatel‑Lucent recommends annual recalibration to maintain accuracy. The unit includes a built‑in self‑test function. Regular cleaning of connector interfaces is advised to prevent false readings.

Compliance

The 938A meets safety standards for Class 1M laser products and complies with CE and FCC regulations.

Conclusion

The Alcatel‑Lucent 938A Optical Loss Set is an indispensable tool for any optical network technician. Its combination of accuracy, portability, and ease of use makes it the go‑to solution for measuring fiber loss and ensuring reliable network performance.