Anritsu MN924A Optical Attenuator

The Anritsu MN924A is a precision optical attenuator designed for single-mode fiber applications requiring accurate signal level management across standard telecommunications wavelengths. It combines step and continuous attenuation control in a compact benchtop form factor, delivering up to 65 dB of attenuation with minimal insertion loss and excellent return loss performance.

Technical Specifications

Model: Anritsu MN924A

Fiber Type: Single-mode optical fiber

Wavelengths: 1.3 µm and 1.55 µm (1300 nm / 1550 nm)

Maximum Attenuation: 65 dB

Attenuation Control: Step attenuator (10 dB increments: 0, 10, 20, 30, 40, 50, 60 dB) + continuously variable attenuator (0 to 15 dB in 0.5 dB steps)

Step Attenuation Accuracy: ±1.0 dB (10–20 dB), ±2.0 dB (30–50 dB), ±3.0 dB (≥50 dB)

Variable Attenuation Accuracy: ±1.0 dB (0–10 dB), ±2.0 dB (0–15 dB)

Insertion Loss: ≤3.5 dB

Return Loss: ≥10 dB (FC type connector)

Input-to-Output Crosstalk: ≥70 dB (minimum position)

Optical Connector: FC type

Dimensions: 88 mm (H) × 120 mm (W) × 172 mm (D)

Weight: <2.5 kg

Key Features

Dual attenuation architecture provides coarse (step) and fine (continuous) control for flexible signal conditioning

Low insertion loss maintains optical signal quality across the C and L bands

High crosstalk isolation ensures clean, undegraded optical paths

FC connectors with standard configuration; Super PC-type connectors available on MN9605A variant for enhanced return loss performance

Typical Applications

Fiber optic communication system characterization and testing

Optical power level calibration and verification

Signal attenuation in single-mode fiber networks operating at 1.3 µm or 1.55 µm

Compatibility & Integration The MN924A operates exclusively with single-mode optical fibers and is configured for the 1.3 µm and 1.55 µm telecommunications windows.