Open AccessDivided-Pulse Nonlinear Amplification at 1.5 μm
Author(s) -
Qiang Hao,
Yunfeng Wang,
Tingting Liu,
Hong Hu,
Heping Zeng
Publication year - 2016
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2016.2603233
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
Divided-pulse nonlinear amplification was developed in the anomalous dispersion regime by combining the concepts of divided-pulse nonlinear amplification and divided-pulse compression. We realized compressor-free ultrafast pulse amplifiers at 1.5 μm with the help of simultaneous pulse amplification and compression in single-mode and few-mode fibers with anomalous dispersion. With optimized positive prechirping on the seed pulse, the interplay between the dispersive and nonlinear effects was controlled to get transform-limited soliton replicas. Experiments, as well as numerical simulations, demonstrated that ~0.75 nJ per replica was the optimized results in the 12/130 Er-Yb codoped fiber. By polarization-division multiplexing 32 replicas, transform-limited pulse with 126-fs duration, 20.3-nJ pulse energy, and 80-MHz repetition rate was generated from a few-mode Er-Yb codoped fiber. Furthermore, limitations on the coherent combining efficiency are discussed.