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Paper Abstract and Keywords
Presentation 2023-01-13 10:15
Inter-core skew and mode-dependent loss degrade Q2 in long-haul coupled-core multicore fibre transmission
Shohei Beppu, Daiki Soma, Noboru Yoshikane, Takehiro Tsuritani (KDDI Research) OCS2022-65
Abstract (in Japanese) (See Japanese page) 
(in English) To dramatically increase the transmission capacity of optical backbone network systems, space division multiplexing (SDM) transmission systems, in which multiple spatially different channels are utilized to distribute the transmission power, are attracting attention. According to Shannon's theorem, the total transmission capacity can be increased by increasing the number of SDM channels, as the transmission channel capacity only decreases with the logarithm of the transmission power. Coupled-core multi-core fibre (CC-MCF) transmission have attracted attention as SDM transmission systems that can achieve long-distance and massive SDM. The number of cores can be increased (e.g., 12 cores) and the effective area can be increased by compensating for crosstalk between cores using multiple-input multiple-output (MIMO) digital signal processing at the receiver. Moreover, CC-MCFs have low spatial mode dispersion (SMD), enabling MIMO equalization with low computational complexity. However, when an optical repeater is configured with a fan-in/fan-out (FIFO) device and multiple single-core EDFAs, excellent optical amplification performance is achieved, but an extra inter-core group delay difference, namely, skew, is generated. The skew increase effective SMD. If the SMD exceeds the tolerance of MIMO signal processing, Q2 degradation occurs. High-precision skew adjustment is therefore required. When the optical transponder is composed of a multi-core EDFA and a direct connection (e.g., fusion splice) to the transmission fiber, the skew problem can be avoided, but a large mode-dependent loss (MDL) is introduced. The non-orthogonal crosstalk between spatial modes caused by the MDL cannot be removed by the usual linear MIMO equalization, which causes a significant degradation in the Q2. However, the relationship between skew and MDL and Q2 has not been evaluated in detail.
In this work, we experimentally investigate on the relationship between skew and MDL and the Q2 after long-haul transmission. It was found that an adjustment error of only 200 ps/span or less is required for skew to sufficiently suppress Q2. It was also found that the MDL not only causes a significant degradation of the average Q2, but also introduces time instability of Q2.
Keyword (in Japanese) (See Japanese page) 
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Reference Info. IEICE Tech. Rep., vol. 122, no. 332, OCS2022-65, pp. 27-32, Jan. 2023.
Paper # OCS2022-65 
Date of Issue 2023-01-05 (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 OCS2022-65

Conference Information
Committee OCS CS  
Conference Date 2023-01-12 - 2023-01-13 
Place (in Japanese) (See Japanese page) 
Place (in English) CANAL CITY HAKATA 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To OCS 
Conference Code 2023-01-OCS-CS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Inter-core skew and mode-dependent loss degrade Q2 in long-haul coupled-core multicore fibre transmission 
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1st Author's Name Shohei Beppu  
1st Author's Affiliation KDDI Research (KDDI Research)
2nd Author's Name Daiki Soma  
2nd Author's Affiliation KDDI Research (KDDI Research)
3rd Author's Name Noboru Yoshikane  
3rd Author's Affiliation KDDI Research (KDDI Research)
4th Author's Name Takehiro Tsuritani  
4th Author's Affiliation KDDI Research (KDDI Research)
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Speaker Author-1 
Date Time 2023-01-13 10:15:00 
Presentation Time 25 minutes 
Registration for OCS 
Paper # OCS2022-65 
Volume (vol) vol.122 
Number (no) no.332 
Page pp.27-32 
#Pages 6 
Date of Issue 2023-01-05 (OCS) 

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