Reduction of Crosstalk by Trench-Assisted Multi-Core Fiber

Impact of Intercore Crosstalk on Achievable Information Rates

“…MCFs with different core layout, core pitch, and cladding refractive index profiles and various strategies for reducing the crosstalk interaction and its impact have been investigated [4,5]. It was observed that a cross talk (XT) of less than -32.2dB/100km can reduce transmission distances by up to 40% [6].…”

Petabit/s Optical Transmission Using Multicore Space-Division-Multiplexing

“…Low loss characteristics of MCFs are known to be almost the same as those of conventional single-core fibers [2]- [4]. As mentioned before, high-power durability is also important for ultra-high-capacity optical transmission, and supportable power levels of several W have been obtained [20].…”

Multicore fibers for large capacity transmission

“…Coupled MCFs supporting single transverse mode and multi transverse modes have been investigated for high power fiber laser applications [9,10], since they are able to be used as large-mode-area (LMA) fibers, while the coupled MCFs supporting a few supermodes can be used as few-mode fibers (FMFs) for large capacity transmission experiments with mode-division multiplexing (MDM) technique [11][12][13][14]. In terms of core arrangement in uncoupled MCFs, homogeneous MCFs with identical multiple cores [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] and heterogeneous MCFs with several kinds of different cores [31][32][33][34][35] have been reported. In addition, each core can be designed to support not only single mode but also few modes and multi modes, and they can be called single-mode MCF (SM-MCF), few-mode MCF (FM-MCF) [36][37][38][39][40][41][42], and multimode MCF (MM-MCF) [43], respectively.…”

“…In addition, each core can be designed to support not only single mode but also few modes and multi modes, and they can be called single-mode MCF (SM-MCF), few-mode MCF (FM-MCF) [36][37][38][39][40][41][42], and multimode MCF (MM-MCF) [43], respectively. Table 1 summarizes the recently fabricated uncoupled SM-MCFs [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. In the uncoupled MCFs, high core density as well as low attenuation and large effective area, A eff , are important characteristics for utilizing MCFs as a transmission fiber to improve optical signal to noise ratio (OSNR) and SDM efficiency.…”

“…In order to decrease crosstalk and to increase core density in MCFs, trench-assisted MCFs (TA-MCFs) [19,20,22] and hole-assisted MCFs (HA-MCFs) [54,55] have been proposed. Figure 4 shows a typical cross sectional view of a fabricated TA-MCF with homogeneous core arrangement, where identical seven cores with low-index trench profile are arranged hexagonally.…”