Hybrid gain-flattened and reduced power excursion scheme for distributed Raman amplification

Abstract

Abstract:We propose and evaluate through extensive numerical modelling a novel distributed hybrid amplification scheme combining first and secondorder Raman pumping which gives reduced signal power excursion over a wide spatial-spectral range of 80 nm in C+L-bands.

Adiabatic Soliton Laser

“…The FBGs create a cavity for the radiation at 1455 nm, which serves as a secondary pump and provides evenly distributed gain for the signal at 1550 nm along the SMF. This works similarly to the ultralong laser schemes used for quasilossless transmission over long optical communication links [21][22][23][24].…”

“…The adiabatic change of the soliton parameters during evolution in the resonator suppresses the resonance radiation of dispersive waves from the soliton inherent for traditional soliton lasers. Adiabatic amplification of the soliton in a long fiber-laser cavity could be implemented, similar to the scheme recently developed in the context of quasilossless optical-transmission links [21][22][23][24]. It is based on the distributed, second-order Raman amplification, combining bidirectional pumping at 1366 nm and fiber Bragg grating (FBG) reflectors at 1455 nm to achieve an even distribution of the gain along the fiber span at 1550 nm.…”

“…It is based on the distributed, second-order Raman amplification, combining bidirectional pumping at 1366 nm and fiber Bragg grating (FBG) reflectors at 1455 nm to achieve an even distribution of the gain along the fiber span at 1550 nm. In the proposed adiabatic soliton fiber laser, the distributed Raman amplifier not only compensates for losses along the cavity (as in the transmission links [21][22][23][24]), but also produces a small residual gain that is uniformly distributed along the fiber. An interesting property of the proposed scheme is that stable soliton compression can occur in the resonator.…”

“…The new feature in our scheme, compared to Refs. [21][22][23][24], is that the fiber span acts as a distributed adiabatic amplifier, with the output pulse power slightly higher than the input one. By comparison, in telecommunication applications that Refs.…”

High‐power random distributed feedback fiber laser: From science to application

“…Apart from the recently published overview on RDFFL that mainly focused on the spectral and statistical properties, nonlinear kinetic theory and applications in telecommunications and distributed sensing , we intend to conduct more thorough research on high‐power generation. In this paper, we study the theory of high‐power generation, the realization methods and the experimental verifications of RDFFL in the application fields such as midinfrared laser generation, high‐power amplification and nonlinear frequency conversion.…”