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Paper Abstract and Keywords
Presentation 2025-08-29 11:40
[Panel Discussion] Standardization of 1.6Tbit/s and Feasibility of 3.2Tbit/s -- Analyzing IMDD and Coherent Applications from a Power Consumption Perspective --
Seiji Okamoto (NTT) R2025-30 EMD2025-21 CPM2025-34 OPE2025-71 LQE2025-26
Abstract (in Japanese) (See Japanese page) 
(in English) Over the past decade, to meet the ever-increasing bandwidth demands driven by the rapid increase of high-definition video services, the combination of coherent optical transmission technology and pluggable transceivers has delivered low-power, compact solutions for primarily metro-distance and longer-reach traffic. Since ChatGPT launched in November 2022, however, the explosive growth of generative AI has concentrated on new bandwidth requirements within data-center networks under 2 km, where intensity-modulation direct-detection (IMDD) schemes—offering lower power consumption than coherent approaches—have been adopted. Yet when aggregate capacities exceed 1.6 Tbit/s, IMDD suffers pronounced performance degradation due to waveform distortions such as chromatic dispersion (CD) and polarization-mode dispersion (PMD), making it impossible to extend reach; as a result, coherent techniques are expected even for short-reach links. In this report, we examine the standardization of 1.6 Tbit/s-class coherent systems and review the latest conference findings on IMDD, evaluate the architectures and their power consumption at both 1.6 Tbit/s and 3.2 Tbit/s across different link distances, and discuss the appropriate delineation between IMDD and coherent approaches.
Keyword (in Japanese) (See Japanese page) 
(in English) 1.6Tbit/s / 3.2Tbit/s / 1600ZR / 1600ZR+ / 1600CL / 448Gbit/s / Coherent / IMDD  
Reference Info. IEICE Tech. Rep., vol. 125, no. 158, LQE2025-26, pp. 62-64, Aug. 2025.
Paper # LQE2025-26 
Date of Issue 2025-08-21 (R, EMD, CPM, OPE, LQE) 
ISSN Online edition: ISSN 2432-6380
Copyright
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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 R2025-30 EMD2025-21 CPM2025-34 OPE2025-71 LQE2025-26

Conference Information
Committee R CPM LQE OPE EMD  
Conference Date 2025-08-28 - 2025-08-29 
Place (in Japanese) (See Japanese page) 
Place (in English) Otaru Chamber of Commerce & Industry 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Photodetectors, Modulators, Optical Electrical device packaging and reliability 
Paper Information
Registration To LQE 
Conference Code 2025-08-R-CPM-LQE-OPE-EMD 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Standardization of 1.6Tbit/s and Feasibility of 3.2Tbit/s 
Sub Title (in English) Analyzing IMDD and Coherent Applications from a Power Consumption Perspective 
Keyword(1) 1.6Tbit/s  
Keyword(2) 3.2Tbit/s  
Keyword(3) 1600ZR  
Keyword(4) 1600ZR+  
Keyword(5) 1600CL  
Keyword(6) 448Gbit/s  
Keyword(7) Coherent  
Keyword(8) IMDD  
1st Author's Name Seiji Okamoto  
1st Author's Affiliation nippon telegraph and telephone corporation (NTT)
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Speaker Author-1 
Date Time 2025-08-29 11:40:00 
Presentation Time 10 minutes 
Registration for LQE 
Paper # R2025-30, EMD2025-21, CPM2025-34, OPE2025-71, LQE2025-26 
Volume (vol) vol.125 
Number (no) no.154(R), no.155(EMD), no.156(CPM), no.157(OPE), no.158(LQE) 
Page pp.62-64 
#Pages 3 
Date of Issue 2025-08-21 (R, EMD, CPM, OPE, LQE) 

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