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| Presentation | 2022-01-13 16:20 85.2-Tbit/s Coupled 4-Core Fiber Transmission over 3,120 km Using PS-16QAM Signals Shohei Beppu, Daiki Soma, Hidenori Takahashi, Noboru Yoshikane, Itsuro Morita, Takehiro Tsuritani (KDDI Research, Inc.)  OCS2021-35 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | In the optical submarine cable system, which is a global communication infrastructure, continuous and dramatic increase of the total cable capacity is required in order to meet the huge demand of communication traffic in the future. To maximize the total cable capacity under the average optical power limitation, the space-division multiplexing (SDM) technique has been attracting attention, in which multiple spatially channels are used to distribute the launch power. Because the capacity per channel decreases with the logarithm of the signal to noise ratio (SNR) according to Shannon's theorem, the total transmission capacity can be enlarged by increasing the number of SDM channels. In recent years, optical cables which accommodates a large number of fiber pairs (FPs) per cable and used them as SDM channels (namely, SDM1) has been considered a promising candidate. However, space limitation in conventional cable structures is a problem for further increasing the number of FPs. To further increase of the number of SDM channels, multi-core fibers (MCFs) and multimode fibers (MMFs) are attracting attention. In particular, MCFs with a standard cladding diameter of 125 um are considered as the first step toward the early development of SDM transmission systems using MCFs. Because standard cladding MCFs are expected to have the same mechanical strength and productivity as conventional SMFs, and conventional cable structures can also be applied. In this study, we focus on coupled MCFs, which can have larger number of cores than uncoupled MCFs. In addition to using the coupled MCFs, optimization of a modulation format according to the channel SNR is also important for maximizing the transmission capacity. In recent years, probabilistic shaping (PS), which can adjust the entropy, has been attracting attention as a modulation format optimization scheme. However, there is no report on the application of PS to coupled MCF transmission systems. In this work, the entropy of PS-16QAM signals was optimized for a 3,000-km optical submarine cable system with standard cladding diameter coupled core 4-core fibers. A transmission capacity of 85.2-Tbps was achieved after a 3,120-km coupled 4-core fiber transmission. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Space division multiplexing / Multicore fiber / Probabilistic shaping / / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 121, no. 320, OCS2021-35, pp. 11-15, Jan. 2022. | |
| Paper # | OCS2021-35 | |
| Date of Issue | 2022-01-06 (OCS) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | OCS2021-35 |
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| Conference Information | |
| Committee | OCS CS |
| Conference Date | 2022-01-13 - 2022-01-14 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Conference room 204A・B at KDDI Ishin-hall |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Core and metro system, Submarine telecommunications system, Optical access system and next generation PON, Ethernet, Optical Transport Network (OTN), Transmission monitoring and control, Design and tool for optical transmission system, Co-operation between optical and mobile, etc. |
| Paper Information | |
| Registration To | OCS |
| Conference Code | 2022-01-OCS-CS |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | 85.2-Tbit/s Coupled 4-Core Fiber Transmission over 3,120 km Using PS-16QAM Signals |
| Sub Title (in English) | |
| Keyword(1) | Space division multiplexing |
| Keyword(2) | Multicore fiber |
| Keyword(3) | Probabilistic shaping |
| Keyword(4) | |
| Keyword(5) | |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Shohei Beppu |
| 1st Author's Affiliation | KDDI Research, Inc. (KDDI Research, Inc.) |
| 2nd Author's Name | Daiki Soma |
| 2nd Author's Affiliation | KDDI Research, Inc. (KDDI Research, Inc.) |
| 3rd Author's Name | Hidenori Takahashi |
| 3rd Author's Affiliation | KDDI Research, Inc. (KDDI Research, Inc.) |
| 4th Author's Name | Noboru Yoshikane |
| 4th Author's Affiliation | KDDI Research, Inc. (KDDI Research, Inc.) |
| 5th Author's Name | Itsuro Morita |
| 5th Author's Affiliation | KDDI Research, Inc. (KDDI Research, Inc.) |
| 6th Author's Name | Takehiro Tsuritani |
| 6th Author's Affiliation | KDDI Research, Inc. (KDDI Research, Inc.) |
| Speaker | Author-1 |
| Date Time | 2022-01-13 16:20:00 |
| Presentation Time | 25 minutes |
| Registration for | OCS |
| Paper # | OCS2021-35 |
| Volume (vol) | vol.121 |
| Number (no) | no.320 |
| Page | pp.11-15 |
| #Pages | 5 |
| Date of Issue | 2022-01-06 (OCS) |
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