DAS Integration Module with Full-Time Clock-Synchronized RF Input GY-AIO-DAS-40-250-1

DAS integration module with full-clock-synchronized RF input, supporting 80 or 200 MHz intermediate frequency signals

1 Overview

The clock-synchronized DAS all-in-one system features a 3U chassis. The hardware consists of a DAS integrated module, a high-speed acquisition card, an industrial control computer, a power supply module, and other components. The high-speed acquisition card is based on a DAQ+AWG architecture. Compared to traditional AOM and DAQ solutions that use a common clock source, the AOM in the clock-synchronized DAS is driven by RF pulses generated by the AWG. This not only achieves full clock synchronization with the DAQ but also ensures that the initial phase of the pulses is completely consistent, enabling high-speed acquisition and real-time demodulation of all-fiber signals. It also integrates coherent fading suppression technology, thereby significantly enhancing the system’s demodulation stability and reliability in long-distance and weak-signal scenarios. The rear of the chassis features reserved FC/APC sensor fiber optic cable interfaces, and the industrial PC comes pre-installed with the Windows operating system by default.

This all-in-one system is suitable for distributed fiber-optic sensing applications such as long-distance perimeter intrusion monitoring, oil and gas pipeline leak early warning, railway safety monitoring, structural health monitoring of tunnels and slopes, status monitoring of submarine and terrestrial cables, and vibration monitoring of urban infrastructure, providing the industry with a high-performance, easy-to-deploy integrated hardware platform.

2.Features

•  High integration
•  Modular design allows selection of modules based on sensing distance
•  Full-clock synchronization ensures initial phase stability
•  High stability and high reliability

3.Applications

• Perimeter Intrusion Monitoring
• Oil and Gas Pipeline Leak Early Warning
• Safety Monitoring Along Railway Lines
• Structural Health Monitoring of Tunnels and Slopes
• Condition Monitoring of Submarine and Land Cables

 4.System Architecture Diagram

 Schematic Diagram of the Host System Architecture

Note: This system uses clock-synchronized DAS modules, meaning that the pulse modulation of the DAS modules is generated by the RF pulse modulation of the acquisition card, and the TTL trigger output signal from the acquisition card is used to enable modulation of the modules. Due to the AOM switching delay, the width of the TTL pulse must be at least 20 ns wider than that of the RF pulse during secondary development, as shown in Figure

Schematic Diagram of TTL Enable and RF Pulse

5.Optical Path Configuration

Schematic Diagram of the Optical Path Configuration

6.Performance Specifications

Hardware Configuration

External Interfaces

Pre-installed Software