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Paper Abstract and Keywords
Presentation 2026-06-09 16:20
[Special Invited Talk] First Coherent DSP and Pluggable Transceiver Capable of Distance-Resolved, Longitudinal Power Monitoring
Takeo Sasai, Yukinobu Nakajima, Minami Takahashi, Runa Kaneko, Masanori Nakamura, Asuka Matsushita, Fukutaro Hamaoka, Etsushi Yamazaki (NTT) OCS2026-8 OFT2026-17 OPE2026-8 LQE2026-8
Abstract (in Japanese) (See Japanese page) 
(in English) This talk reviews our recent post-deadline paper presented at OFC2026 [1]. In this work, we demonstrate the world's first implementation of the Longitudinal Power Monitoring (LPM), which visualizes the fiber-longitudinal power distribution along an optical fiber link using only the coherent receiver, on a coherent DSP chip. By processing only the standard 800ZR+/400ZR+ traffic signals received at a compact OSFP pluggable transceiver, we achieve distributed monitoring over up to 1005 km with a sampling resolution of 2.1 km, and successfully localize multiple optical power anomalies along the link. We also confirm correct LPM operation when the transmit signal originates from a different vendor's transceiver, demonstrating multi-vendor interoperability. Furthermore, we verify that the LPM introduces no penalty in transmission performance or power consumption, confirming the simultaneous realization of data communication and distributed monitoring.
Keyword (in Japanese) (See Japanese page) 
(in English) Coherent DSP / Pluggable transceiver / Longitudinal power monitoring / / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 59, OCS2026-8, pp. 32-33, June 2026.
Paper # OCS2026-8 
Date of Issue 2026-06-02 (OCS, OFT, OPE, LQE) 
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 OCS2026-8 OFT2026-17 OPE2026-8 LQE2026-8

Conference Information
Committee LQE OCS OFT OPE  
Conference Date 2026-06-09 - 2026-06-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To OCS 
Conference Code 2026-06-LQE-OCS-OFT-OPE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) First Coherent DSP and Pluggable Transceiver Capable of Distance-Resolved, Longitudinal Power Monitoring 
Sub Title (in English)  
Keyword(1) Coherent DSP  
Keyword(2) Pluggable transceiver  
Keyword(3) Longitudinal power monitoring  
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1st Author's Name Takeo Sasai  
1st Author's Affiliation NTT, Inc. (NTT)
2nd Author's Name Yukinobu Nakajima  
2nd Author's Affiliation NTT, Inc. (NTT)
3rd Author's Name Minami Takahashi  
3rd Author's Affiliation NTT, Inc. (NTT)
4th Author's Name Runa Kaneko  
4th Author's Affiliation NTT, Inc. (NTT)
5th Author's Name Masanori Nakamura  
5th Author's Affiliation NTT, Inc. (NTT)
6th Author's Name Asuka Matsushita  
6th Author's Affiliation NTT, Inc. (NTT)
7th Author's Name Fukutaro Hamaoka  
7th Author's Affiliation NTT, Inc. (NTT)
8th Author's Name Etsushi Yamazaki  
8th Author's Affiliation NTT, Inc. (NTT)
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Speaker Author-1 
Date Time 2026-06-09 16:20:00 
Presentation Time 25 minutes 
Registration for OCS 
Paper # OCS2026-8, OFT2026-17, OPE2026-8, LQE2026-8 
Volume (vol) vol.126 
Number (no) no.59(OCS), no.60(OFT), no.61(OPE), no.62(LQE) 
Page pp.32-33 
#Pages 2 
Date of Issue 2026-06-02 (OCS, OFT, OPE, LQE) 

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