Few-mode multi-core fibre with highest core multiplicity factor

Sakamoto, Taiji; Matsui, Takashi; Saitoh, Kunimasa; Saitoh, Setsuo; Takenaga, Katsuhiro; Matsuo, Shoichiro; Tobita, Yuki; Hanzawa, Nobutomo; Nakajima, Kazuhide; Yamamoto, Fujio

doi:10.1109/ecoc.2015.7341964

Cited by 30 publications

(13 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two of them are the 2-LP mode (LP 01 and LP 11 modes) and single-core (SC) FMFs with a step index (SI) profile and a grated index (GI) profile in which the core exists only in the center. The remaining one is a 4-LP mode (LP 01 , LP 11 , LP 21 , and LP 02 modes) and 12-core FMF [15]. The FM-MCF has a low-refractiveindex trench in the region surrounding the core inside the cladding, and the core itself has a GI profile.…”

Section: Resultsmentioning

confidence: 99%

Demonstration of true-eigenmode propagation in few-mode fibers by selective LP mode excitation and near-field observation

Yamaguchi

Miura

Kimura

2018

IEICE Electron. Express

View full text Add to dashboard Cite

We observed the near-field patterns of light output from fewmode fibers (FMFs) in which an LP mode was selectively excited. It was confirmed from the variation of the intensity profile with the wavelength that the true eigenmodes of a circular core fiber are guided in single-core stepindex and graded-index FMFs. On the other hand, we discovered a new phenomenon that LP 11 modes propagate as eigenmodes oriented along a specific axis in 4-LP mode 12-core FMF. In addition, we confirmed that this phenomenon is not due to the elliptical deformation of the core by observing the NFP and calculating the eigenmodes in an elliptical core using elliptical cylindrical coordinates and the Mathieu function.

show abstract

Section: Resultsmentioning

confidence: 99%

Demonstration of true-eigenmode propagation in few-mode fibers by selective LP mode excitation and near-field observation

Yamaguchi

Miura

Kimura

2018

IEICE Electron. Express

View full text Add to dashboard Cite

show abstract

“…Two of them were 2-LP-mode (LP 01 and LP 11 modes) single-core (SC) FMFs with a step-index (SI) profile and a graded-index (GI) profile in which the core only exists at the center. The remaining two were 4-LP-mode (LP 01 , LP 11 , LP 21 , and LP 02 modes) 12-core [50] and 19-core [51] FMFs. Both MCFs have a low-refractive-index trench in the region surrounding the core inside the cladding, and the core itself has a GI profile.…”

Section: Resultsmentioning

confidence: 99%

Predictable and unpredictable phenomena in optical fibers for space-division/mode-division multiplexing transmission: statistical analysis of coupling and mysterious behavior of modes

Kimura

Koshiba

2020

IEICE Electron. Express

View full text Add to dashboard Cite

The transmission capacity of single-mode single-core fibers is approaching the limit of about 100 Tbps owing to nonlinearity and the fiber fuse, which limit the input signal power. To avoid the so-called capacity crunch and dramatically increase the transmission capacity, a new approach utilizing space-division multiplexing (SDM) and mode-division multiplexing (MDM) has been proposed and demonstrated. In these new multiplexing technologies, a problem that is unprecedented in conventional single-mode fibers, namely, the crosstalk between transmission channels, arises. Although the input signal channels are mixed through at the output end, the signal channel can be identified using multiple-input multipleoutput (MIMO) signal processing technology at the output end. However, even using the MIMO digital signal processing technology, the problem that the computation time increases with the number of channels remains, resulting in increased latency, and so the number of channels is limited. To design a transmission system using the SDM and MDM technologies, the crosstalk should be analyzed precisely. However, the origin and behavior of crosstalk are different in SDM using multicore fibers (MCFs) and in MDM using few-mode fibers (FMFs). The behavior of crosstalk in single-mode MCFs is predictable to some extent by statistical analysis, and the system can be designed by considering the results of the analysis. On the other hand, the behavior of crosstalk of FMFs is less predictable. Since the mode launched at the input end is not the eigenmode, mode discrimination or accurate mode demultiplexing is difficult using a conventional mode demultiplexer. In addition, the eigenmode itself of FMFs is not always the hybrid mode predicted by the conventional theory but sometimes a linearly polarized (LP) mode, contradicting the conventional theory. In other words, the demultiplexed signal always involves crosstalk regardless of the transmission distance, and the quantity of crosstalk cannot be analyzed statistically. Therefore, the crosstalk and its behavior are unpredictable. In spite of these unpredictable phenomena, the signal channel can be identified using the MIMO signal processing as in single-mode MCFs. This means that the MDM technology using FMFs is established in the engineering or inductive logic sense, but still involves unexplained phenomena in the scientific or deductive logic sense. In this review, we discuss the predictable behavior of crosstalk in single-mode MCFs and also the unpredictable behavior of crosstalk in FMFs.

show abstract

“…Recently proposed SM-MCFs with SCC of 30 and more [14], [15] and FM-MCF with SCC of 72 [17] showed XT of about -30 dB/ 100 km. These fibers will contribute to transmission with large capacity or high-order modulation.…”

Section: Scc Versus Core-to-core Xtmentioning

confidence: 99%

“…The reduction of |DMD| enables the lengthening of the transmission distance from 40.4 [7] to 527 km [8]. The FM-MCF with SCC of 72, which involves 12 cores with six modes (four LP modes), successfully controlled |DMD| under less than 430 ps/km for all cores owing to a graded index profile [17]. We need to select the combination of CC and MC with the tradeoff relationship between SCC and DMD in mind.…”

Section: Scc Versus Dmdmentioning

confidence: 99%

“…Another approach is combining few modes and multiple cores: few-mode multicore fibers (FM-MCFs). Some FM-MCFs exceeded the record spatial channel count (SCC) of SM-MCFs and FMF: 36 with 3 modes × 12 cores [7], [8], 72 with 6 modes × 12 cores [17], 108 with 3 modes × 36 cores [9], 114 with 6 modes × 19 cores [10]. However, FM-MCFs should overcome both issues for SM-MCFs and FMFs simultaneously.…”

mentioning

confidence: 99%

See 1 more Smart Citation

High-Spatial-Multiplicity Multicore Fibers for Future Dense Space-Division-Multiplexing Systems

Matsuo

Takenaga

Sasaki

et al. 2016

J. Lightwave Technol.

Self Cite

111

View full text Add to dashboard Cite

Multicore fibers and few-mode fibers have potential application in realizing dense-space-division multiplexing systems. However, there are some tradeoff requirements for designing the fibers. In this paper, the tradeoff requirements such as spatial channel count, crosstalk, differential mode delay, and cladding diameter are discussed. Further, the design concept and transmission characteristics of high-core-count single-mode multicore fibers are discussed. A heterogeneous multicore fiber with 30 cores and quasisingle-mode multi-core fibers with 31 cores are developed. Index Terms-Optical fiber, optical fibers communication. I. INTRODUCTION S PACE division multiplexing (SDM) over multicore fibers (MCFs) or few-mode fibers (FMFs) has been investigated to overcome the capacity limitation of approximately 100 Tb/s/fiber for the existing optical communication system over a single-mode single-core fiber (SM-SCF). Many SDM transmission experiments over MCFs or FMFs have demonstrated the possibility of SDM technology for future dense SDM systems [1]-[13].

show abstract

Few-mode multi-core fibre with highest core multiplicity factor

Abstract: The highest relative core multiplicity factor of more than 22 is achieved by arranging a 6-mode 12-core fibre in 227-µm cladding. A quadratic double ring core arrangement realizes sufficiently low crosstalk and enables us to use advanced multi-level modulation.

Cited by 30 publications

References 8 publications

Demonstration of true-eigenmode propagation in few-mode fibers by selective LP mode excitation and near-field observation

Demonstration of true-eigenmode propagation in few-mode fibers by selective LP mode excitation and near-field observation

Predictable and unpredictable phenomena in optical fibers for space-division/mode-division multiplexing transmission: statistical analysis of coupling and mysterious behavior of modes

High-Spatial-Multiplicity Multicore Fibers for Future Dense Space-Division-Multiplexing Systems

Contact Info

Product

Resources

About