研究目的
Investigating Raman fiber laser (RFL)-based amplification techniques and their applications in long-haul/unrepeatered coherent transmission systems.
研究成果
Raman fiber laser–based amplification techniques, particularly random DFB fiber laser–based amplification, offer significant improvements in long-haul and unrepeatered coherent transmission systems by mitigating signal RIN and enabling bidirectional second-order pumping. This scheme provides the best trade-off between ASE noise and nonlinearity, offering the best transmission performance and flexibility in adjusting signal power distributions to meet specific link requirements.
研究不足
The study focuses on specific configurations of RFL-based amplification techniques and their applications in coherent transmission systems. The limitations include the specific fiber lengths and pump powers used, which may not cover all possible scenarios in practical applications.
1：Experimental Design and Method Selection:
The study investigates RFL-based amplification techniques from signal/noise power distributions, relative intensity noise (RIN), and fiber laser mode structures. Two categories of RFL-based amplification techniques are explored: cavity Raman fiber laser with two fiber Bragg gratings (FBGs) and random distributed feedback (DFB) Raman fiber laser using one FBG.
2：Sample Selection and Data Sources:
The experiments use 83 km SSMF for cavity fiber laser-based amplification and random DFB Raman fiber laser-based amplification.
3：List of Experimental Equipment and Materials:
Equipment includes FBGs, depolarized continuous wave second-order pumps at 1366 nm, and an optical time-domain reflectometer (OTDR) setup for signal power distribution measurements.
4：Experimental Procedures and Operational Workflow:
Signal power distributions along the transmission fiber are measured using a modified OTDR setup. The RIN of the output signal is measured after one span from a CW low RIN tunable laser source.
5：Data Analysis Methods:
The study uses simulations to describe the power evolution and calculates signal power variation (SPV) as a metric to compare different pumping schemes.
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