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Raman/EDFA hybrid bidirectional amplifier for fiber-optic time and frequency synchronization.

Kuanlin Mu, Zhuoze Zhao, Zhengkang Wang

|March 17, 2021

Summary

A hybrid Raman/Erbium-doped fiber amplifier (EDFA) system enhances time and frequency synchronization stability. This novel approach offers superior gain and lower noise figures compared to traditional EDFAs for precise signal transmission.

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Area of Science:

Optoelectronics and Photonics
Telecommunications Engineering
Precision Measurement

Background:

Fiber-optic time and frequency synchronization systems are crucial for modern networks.
Erbium-doped fiber amplifiers (EDFAs) are commonly used but have limitations in stability.
Improving amplifier performance is key to advancing synchronization precision.

Purpose of the Study:

To investigate the performance enhancement of fiber-optic synchronization systems using a hybrid Raman/EDFA amplifier.
To compare the stability and noise performance of hybrid amplifiers against traditional EDFAs.
To determine the optimal configuration for Raman and EDFA integration.

Main Methods:

Designed and analyzed a bidirectional Raman/EDFA hybrid amplifier.
Studied the gain efficiency of a fiber Raman amplifier (FRA) concerning pump and signal power.
Evaluated amplifier performance in a free-running frequency synchronization system.

Main Results:

Achieved equivalent noise figures below 0 dB with the hybrid amplifier.
Demonstrated superior transfer stabilities of 1.9678 × 10^-13/1 s (FRA+EDFA) and 2.0248 × 10^-13/1 s (EDFA+FRA).
Outperformed the EDFA-only stability of 3.0905 × 10^-13/1 s.

Conclusions:

Raman/EDFA hybrid amplifiers significantly improve the stability of fiber-optic time and frequency synchronization.
The higher gain and lower noise figure of hybrid systems are responsible for the enhanced performance.
Hybrid amplifier configurations offer a promising solution for next-generation precision synchronization networks.