Abstract
A narrow bandwidth (2GHz) π-phase-shift flattop fiber Bragg grating (FBG) is proposed to achieve Brillouin optical time-domain analysis (BOTDA) for perfluorinated graded-index polymer optical fibers (GI-POFs) for the first time to best of our knowledge. Using the technique of BOTDA, we explore the evolution of mode coupling in perfluorinated GI-POFs by analyzing the Brillouin frequency shift (BFS) variation along the whole fiber, and compare them with that of silica graded index multimode fibers (GI-MMFs). The characteristics of mode coupling of GI-POFs and GI-MMFs were also investigated in terms of the speckle patterns at the output face of the two fibers. The results show that compared with silica GI-MMFs, GI-POFs exhibit more efficient mode coupling and the excellent ablility of mode scrambling regardless of alignment conditions.
Highlights
Perfluorinated graded-index polymer optical fibers (GI-POFs) make an excellent choice for the installation of high-performance fiber networks for its capabilities of combining high data transmission rates [1] and low attenuation [2]
Using the technique of Brillouin optical time-domain analysis (BOTDA), we explore the evolution of mode coupling in perfluorinated graded-index polymer optical fibers (GIPOFs) by analyzing the Brillouin frequency shift (BFS) variation along the whole fiber, and compare them with that of silica graded index multimode fibers (GI-MMFs)
The characteristics of mode coupling of GI-POFs and GI-MMFs were investigated in terms of the speckle patterns at the output face of the two fibers
Summary
Perfluorinated graded-index polymer optical fibers (GI-POFs) make an excellent choice for the installation of high-performance fiber networks for its capabilities of combining high data transmission rates [1] and low attenuation [2]. Two useful techniques were proposed to enhance the weak Brillouin scattered light of the GI-POFs: multimode-fiber-assisted coupling technique [8] and pumpprobe technique [9]. Brillouin scattered light between silica-based GI-MMFs and GI-POFs with respect to different core alignment positions was investigated experimentally, and the results shown that BFS changes originated from the excitation of higher order modes [12]. There are some challenges impeding the implementation of distributed measurement of Brillouin scattering in GI-POFs: firstly, the strong Fresnel reflection caused by index mismatch of different materials at the interface of the silica-based GI-MMFs (~1.46) and GI-POFs (~1.35) will lead to photodiode saturation and hinder the measurement of the weak Brillouin signal [6]; secondly, the BFS (2.83GHz) [7] of GI-POFs is much smaller than that of a silica optical fiber, which largely aggravates the difficulty of separating the Brillouin scattered light from the probe beam; the considerable high loss (150dB/km) of GIPOFs at 1.55μm is another challenge for photo detector to fully identify the amplification of the probe beam over a long fiber. Different core alignment positions are adjusted to investigate the ability of mode scrambling of the GI-POFs and GI-MMFs
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
