Description

Yokogawa ANT401-50/S1 Optical Attenuator Module

The Yokogawa ANT401-50/S1, also cataloged as the ANT401 Optical Attenuator Module, operates as a dedicated hardware component for optical power attenuation and signal-level adjustment within Yokogawa AQ2200 optical test systems. The ANT401-50/S1 provides programmable attenuation of single-mode optical signals while maintaining optical path continuity for calibration, receiver sensitivity testing, and optical link characterization.

Suffix Breakdown & Model Matrix

Item	Description
Base Model	ANT401
Full Model	ANT401-50/S1
-50	Attenuation range/configuration designation as specified by Yokogawa
/S1	SC-type single-mode optical connector configuration
Notes	No additional suffix decomposition is specified in the provided documentation

Hardware Specifications

Parameter	Specification
Model	ANT401-50/S1
Brand	Yokogawa
Origin	Japan
Product Type	Single-Mode Optical Attenuator Module
Compatible Platform	AQ2200 Multi-Application Test System
Compatible Fiber Type	Single-mode fiber, 9.5/125 um, NA 0.1
Wavelength Range	1200 nm to 1650 nm
Calibration Wavelengths	1310 nm, 1550 nm
Attenuation Range	0 dB to 60 dB (configuration dependent)
Attenuation Resolution	0.001 dB
Attenuation Accuracy	+/- 0.1 dB at calibrated wavelengths
Insertion Loss	<= 1.0 dB typical, excluding connector loss
Maximum Input Power	+23 dBm
Return Loss	>= 45 dB
Optical Connector Type	SC type (/S1 configuration)
Operating Temp	0 degC to +40 degC
Storage Temp	-20 degC to +60 degC
Power Consumption	Supplied through AQ2200 mainframe; module consumption not specified

Channel Isolation and Optical Signal Integrity

For process instrumentation and measurement platforms, channel isolation and signal-path integrity directly influence measurement repeatability. The ANT401-50/S1 performs attenuation through controlled optical power reduction while maintaining specified return loss characteristics of at least 45 dB. Low insertion loss at minimum attenuation settings reduces baseline optical path disturbance and supports calibration consistency across 1310 nm and 1550 nm test wavelengths.

The module integrates with AQ2200 system communication functions for automated control and attenuation sequencing through host interfaces supported by the mainframe. Optical connector cleanliness and proper fiber handling remain primary factors affecting attenuation accuracy and repeatability.

Frequently Asked Questions

Q: Does the ANT401-50/S1 support hot insertion into an AQ2200 mainframe?
A: Hot-swap capability is not specified in the provided documentation. Module installation and removal should follow AQ2200 system procedures and manufacturer recommendations.

Q: Can attenuation accuracy be maintained across the entire wavelength range?
A: The specified attenuation accuracy of +/- 0.1 dB applies at calibrated wavelengths of 1310 nm and 1550 nm. Performance outside calibration points may vary according to system calibration conditions.

Q: What factors most commonly affect attenuation repeatability?
A: Optical connector contamination, fiber end-face damage, excessive connector wear, and improper mating procedures can influence insertion loss, return loss, and attenuation stability.

Field Installation Guidelines

1. Verify that the AQ2200 mainframe is configured for the ANT401 series module before installation.
2. Inspect SC connector end-faces using approved optical inspection equipment.
3. Clean all optical interfaces using fiber-optic cleaning tools before mating connectors.
4. Avoid excessive fiber bend radius that may introduce additional attenuation.
5. Route optical fibers separately from high-power electrical conductors to minimize mechanical disturbance during testing.
6. Install dust caps on all unused optical ports.
7. Perform attenuation verification at the intended operating wavelength after installation.
8. Record calibration wavelength settings and attenuation profiles as part of test system validation procedures.

Specifications

• Brand: Yokogawa

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems