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Coherent fading suppression type DAS all-fiber demodulation module

Coherent fading suppression type DAS all-fiber demodulation module

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Coherent fading suppression type DAS all-fiber demodulation module

Overview
The coherent fading suppression type DAS all-fiber demodulation module integrates the DAS optical acquisition front-end and the DAS high-speed data processing back-end, with a length and width size of only half an A4 sheet. It provides a miniaturized and convenient solution for distributed optical acoustic wave measurement.
In the DAS optical acquisition front-end part, it integrates an ultra-narrow linewidth light source, modulator, amplifier, and coherent receiving module, achieving high signal-to-noise ratio coherent detection and ultra-long-distance sensing, ensuring the excellent performance of the optical link.
In the DAS high-speed data processing back-end part, it adopts a dual-channel 250MSps DAS high-speed acquisition card, supporting gigabit Ethernet communication (data transmission rate up to 1000Mb/s) or 10G optical port communication (data transmission rate up to 10Gb/s), capable of collecting over 100km of optical fiber data. It has an internal phase demodulation algorithm, enabling all-fiber demodulation and coherent fading suppression, and can directly output amplitude-phase demodulation data. The phase data can be directly used as vibration signals without secondary unwrapping; it can also output raw sampling data for users to customize demodulation. This design reduces the system's reliance on CPU computing power, simplifies the development process, and realizes "data reading is usable, phase is vibration".
Features
● High-speed data acquisition and transmission
● Built-in all-fiber demodulation and coherent fading suppression algorithm
● Highly integrated and miniaturized design

Application
● Perimeter intrusion monitoring
● Oil and gas pipeline leakage warning
● Tunnel and slope structure health monitoring
● Cable (underwater and on land) condition monitoring
● Urban infrastructure vibration monitoring

Product performance parameters


kernel parameter

Performance Parameter Min. Typical Max. Unit Remarks
Measurement Distance 40 km
Pulse Width 20 500 ns
Pulse Repetition Frequency 100 50000 Hz Related to fiber length
Response Frequency 1 20000 Hz Related to fiber length
Intermediate Frequency 80 MHz
Spatial Resolution 3 m
DAQ Resolution 0.4m, 0.8m, 1.6m, 3.2m, 6.4m optional m
Gauge Length 2 32 Sample points
Phase Noise Floor <0.1rad @ Gauge Length=20m Gauge‑length dependent
Demodulation Algorithm Coherent‑fading suppressed all‑fiber demodulation
Data Interface Gigabit Ethernet / 10G Optical Port
Data Throughput 1Gb/s(Gigabit Ethernet)/10Gb/s(10G Optical Port)
Data Output Type Raw data, amplitude‑demodulated data, phase‑demodulated data
Transport Protocol UDP
Debug Interface TTL Serial Port
Debug Protocol Modbus‑RTU
Operating Voltage 4.9 5.0 5.2 V
Power Consumption 37 W
Warm‑up Time 2 Min
Operating Temperature -20 60 ℃
Storage Temperature -40 80 ℃


Product Size Description

Product Interfaces and Indicator Lights Description

Table 1: Product Interface Description Table
Interface Type Silkscreen Description
Green Pluggable Terminal 5V DC power supply +5V
Green Pluggable Terminal GND DC power ground
White Pluggable Terminal COM TTL‑level serial port, communicate with host PC for parameter configuration
Sensing Fiber 1 Sensor1 Default FC/APC connector, used for single‑channel devices
Sensing Fiber 2 Sensor2 Default FC/APC connector
Gigabit Ethernet Port GbE RJ45 connector, data rate up to 1000 Mb/s
10G SFP+ Port 10G SFP+ Connect external fiber via SFP+ transceiver, data rate up to 10 Gb/s

Table 2 LED Indicator Description

LED Type Silkscreen Description
Power LED P Main power indicator: ON = powered, OFF = power‑off
Raman1 LED L1 Raman amplifier 1 indicator: ON = enabled, OFF = disabled
Raman2 LED L2 Raman amplifier 2 indicator: ON = enabled, OFF = disabled

 

Professor Wu from F-tone Networks was selected as one of the top 2% global scientists for four consecutive years from 2022 to 2025 (https://elsevier.digitalcommonsdata.com/datasets/btchxktzyw/6)

 

This product only displays a portion of the parameters (161). If you need more information, please contact us.

 

F-tone Networks Technical Support:

Email:una@f-tone.com

WhatsApp and WeChat: +86177 6116 3895

Important Notice

Performance figures, data and any illustrative material provided in this data sheet are typical and must be specifically confirmed in writing by F-tone Networks before they become applicable to any particular order or contract. In accordance with the F-tone Networks policy of continuous improvement specifications may change without notice.

The publication of information in this data sheet does not imply freedom from patent or other protective rights of F-tone Networks or others. Further details are available from any F-tone Networks sales representative.

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Power and Wavelength Testing

Test the signal delivering strength and wavelength, to ensure the signal decoding capacity of the receiver, and the wavelength remains consistent from the transmitter to the receiver.

Power and Wavelength Testing

Traffic Testing

Test the bit error rate and packet loss rate, to make them meet the corresponding standards and ensure the performance of transceivers.

Traffic Testing

Optical Performance Testing

Test the transceivers' eye diagram situation, receiving sensitivity, extinction ratio, wavelength, light-emitting, light-receiving, current and voltage, to ensure the signal quality, stability and reliability of the transmission.

Optical Performance Testing

End Face Testing

Check the end face of the transceivers and keep them clean for more stable data transmission, better performance, and durability.

End Face Testing

Various Switch Tests

Every module is quality tested for compatibility in the multi-brand switches environment, guaranteeing flawless operations.

Various Switch Tests

About F-tone Networks

F-tone Networks is now a world leader in development of optical transceivers and provide a wide range of high-speed optical solutions for optical communication networking, especially for AI, Data Center, enterprise data networking, Industry, aerospace, mining, shipbuilding, railway, metro, long haul transport networking, and mobile access networking applications
F-tone Networks invested in foundational photonics technologies and extensive product development and engineering with global presence in many area also.

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