High-capacity transmission over multi-core fiber link with 19-core optical amplifier

April 08, 2019

[Points]The National Institute of Information and Communications Technology (NICT, President: Hideyuki Tokuda, Ph.D.) and Furukawa Electric Co., Ltd. (Furukawa Electric, President: Keiichi Kobayashi) jointly report a record SDM transmission experiment using multi-core fiber amplifier. Furukawa Electric developed a 19-core Erbium-doped-fiber amplifier utilizing cladding-pumping technology in order to share electrical power between the large number of spatial channels. The amplifier was then integrated into NICT's state of the art transmission test bed of for a record transmission demonstration. Fully decoded optical data transmission of 715 Tb/s was achieved over a distance of 2,009 km using coded polarization division multiplexed (PDM) -16 quadrature-amplitude modulation (QAM) of 345 carriers over the C and L band in a re-circulating transmission loop.

Previously, short-distance, high-capacity transmission in high-core count EDFAs and long-distance transmission in a C-band 7-core amplifier was achieved. This demonstration showed high-core count cladding pumped EDFAs are suitable for high throughput transmission over 1,000s km in both C and L band.

The results of this demonstration(1) were selected for presentation as a post-deadline paper at the 2019 Optical Fiber Conference (OFC 2019), the world's largest event for optical communications research.

[Background]

Single mode, multi-core fibers (MCFs), multi-mode fiber, or a combination of both have been used in numerous high-capacity and long distance SDM transmission demonstrations(2). However, SDM technologies are also driven by the need for hardware integration and energy savings. As such, the successful development of SDM amplifiers is crucial for commercial realization of SDM technologies. In particular, large core-count cladding pumped multi-core erbium doped fiber amplifiers (MC-EDFAs) offer potential to integrate hardware(3) and significantly reduce the number of pump lasers respective to the number of spatial channels(4). Furthermore, such amplifiers are not only compatible with equivalent MCFs, but may also amplify several lower core-count MCFs, arrays of single-mode fibers or even signals from few-mode fibers. Previously large capacity was reached over short distances in a high-core count EDFA(5) and long distance transmission was achieved using a C-band 7-core amplifier(6). This demonstration showed high-core count cladding pumped EDFAs are suitable for high throughput transmission over 1,000s km in both C and L band, achieving the highest throughput-distance product of any SDM amplifier experiment of 1.44 Exb/s x km.

[Achievements]

The partners have performed a record data-throughput x distance experiment using an SDM amplifier. NICT constructed a recirculating transmission test-bed around the 19-core, cladding-pumped EDFA developed by Furukawa Electric.

The transmission system is made up from the following four main technologies. The amplifier was used to amplify signals in 19 cores simultaneously using two un-cooled multi-mode laser pumps per band. The combined pump power was 13.7 W and 43.5 W for the L-band and C-band EDFs respectively, equivalent to conversion efficiencies from electrical power of 40.3 % and 41.6 %.

[Future Prospects]

We are promoting R&D of innovative technology that achieves the early adoption of international standardization by industry-academia collaboration for establishing next-generation optical communication infrastructure technologies which can smoothly accommodate traffic for big data and 5G services. The results of this work were presented as a post deadline at the 2019 Optical Fiber Conference (OFC 2019), held in San Diego, USA from 3 to 7 March 2019.
-end-
[References]

(1) Ben Puttnam, Georg Rademacher, Ruben Luis, Tobias Eriksson, Werner Klaus, Yoshinari Awaji, Naoya Wada, Koichi Maeda, Shigehiro Takasaka and Ryuichi Sugizaki, '0.715 Pb/s Transmission over 2,009.6 km in 19-core cladding pumped EDFA amplified MCF link' In Proc. Optical Fiber Conference (OFC) 2019 paper Th4B.1

(2) T. Mizuno et al. "Dense Space Division Multiplexed Transmission Over Multicore and Multimode Fiber for Long-haul Transport Systems," J. Light. Technol. 34(6), pp. 1484-93, 2016

(3) J. Sakaguchi et al., "19-core MCF transmission system using EDFA with shared core pumping coupled in free-space optics" Opt. Exp., 22 (1), pp. 90-95, 2014

(4) S. Takasaka et al., "Increase of Cladding Pump Power Efficiency by a 19-Core Erbium Doped Fiber Amplifier," In Proc. ECOC'17 pp TH.2.D

(5) T. Kobayashi et al., "1-Pb/s (32 SDM/46 WDM/768 Gb/s) C-band Dense SDM Transmission over 205.6-km of Single-mode Heterogeneous Multi-core Fiber using 96-Gbaud PDM-16QAM Channels," In Proc. OFC'17 pp. Th5B

(6) K. Igarashi et al., "Super-Nyquist-WDM transmission over 7,326-km seven-core fiber with capacity-distance product of 1.03 Exabit/s x km," Opt. Exp., 22(2), pp. 1220-28, 2014

National Institute of Information and Communications Technology (NICT)

Related Data Articles from Brightsurf:

Keep the data coming
A continuous data supply ensures data-intensive simulations can run at maximum speed.

Astronomers are bulging with data
For the first time, over 250 million stars in our galaxy's bulge have been surveyed in near-ultraviolet, optical, and near-infrared light, opening the door for astronomers to reexamine key questions about the Milky Way's formation and history.

Novel method for measuring spatial dependencies turns less data into more data
Researcher makes 'little data' act big through, the application of mathematical techniques normally used for time-series, to spatial processes.

Ups and downs in COVID-19 data may be caused by data reporting practices
As data accumulates on COVID-19 cases and deaths, researchers have observed patterns of peaks and valleys that repeat on a near-weekly basis.

Data centers use less energy than you think
Using the most detailed model to date of global data center energy use, researchers found that massive efficiency gains by data centers have kept energy use roughly flat over the past decade.

Storing data in music
Researchers at ETH Zurich have developed a technique for embedding data in music and transmitting it to a smartphone.

Life data economics: calling for new models to assess the value of human data
After the collapse of the blockchain bubble a number of research organisations are developing platforms to enable individual ownership of life data and establish the data valuation and pricing models.

Geoscience data group urges all scientific disciplines to make data open and accessible
Institutions, science funders, data repositories, publishers, researchers and scientific societies from all scientific disciplines must work together to ensure all scientific data are easy to find, access and use, according to a new commentary in Nature by members of the Enabling FAIR Data Steering Committee.

Democratizing data science
MIT researchers are hoping to advance the democratization of data science with a new tool for nonstatisticians that automatically generates models for analyzing raw data.

Getting the most out of atmospheric data analysis
An international team including researchers from Kanazawa University used a new approach to analyze an atmospheric data set spanning 18 years for the investigation of new-particle formation.

Read More: Data News and Data Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.