A Wide Temperature 112-Gbaud PAM4 Operation of Lumped-EML Submodule Using Resistance-Optimized LC Resonance Effect

Seok Jun Yun; Young Tak Han; Dong Hoon Lee; Dong Hyo Lee; Jang Uk Shin; Sang Ho Park; Hoon Kim; Yongsoon Baek

doi:10.1109/JLT.2025.3580710

A Wide Temperature 112-Gbaud PAM4 Operation of Lumped-EML Submodule Using Resistance-Optimized LC Resonance Effect

Seok Jun Yun
, Young Tak Han^*
, Dong Hoon Lee
, Dong Hyo Lee
, Jang Uk Shin
, Sang Ho Park
, Hoon Kim^*
, Yongsoon Baek

^*Corresponding author for this work

Division of Chemical Engineering

Electronics and Telecommunications Research Institute
Korea Advanced Institute of Science and Technology

Research output: Contribution to journal › Journal article › peer-review

Abstract

We present a high-speed (>70 GHz) lumped-EML submodule whose modulation bandwidth is enhanced by a resistance-optimized LC resonance effect. We perform an equivalent circuit analysis to determine the optimal value of a matching load resistance for 112-Gbaud PAM4 operation over wide temperature range of 25∼70 °C. By fabricating the lumped-EML submodule, we experimentally show that a 3-dB bandwidth of over 70 GHz can be obtained up to 70 °C by optimizing the matching load resistance as well as lengths of bondwires, even with a lumped-EML featuring a moderate EAM length of 120 μm. Consequently, the fabricated lumped-EML submodule revealed clear optical eye patterns under 112-Gbaud PAM4 modulation after 2-km SMF transmissions.

Original language	English
Pages (from-to)	8050-8057
Number of pages	8
Journal	Journal of Lightwave Technology
Volume	43
Issue number	17
DOIs	https://doi.org/10.1109/JLT.2025.3580710
State	Published - 2025

Keywords

4-level pulse amplitude modulation (PAM4)
LC resonance
data center
electro-absorption modulator-integrated lasers (EML)
equivalent circuit

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10.1109/JLT.2025.3580710

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@article{72a60b17436a459db084ad460312308e,

title = "A Wide Temperature 112-Gbaud PAM4 Operation of Lumped-EML Submodule Using Resistance-Optimized LC Resonance Effect",

abstract = "We present a high-speed (>70 GHz) lumped-EML submodule whose modulation bandwidth is enhanced by a resistance-optimized LC resonance effect. We perform an equivalent circuit analysis to determine the optimal value of a matching load resistance for 112-Gbaud PAM4 operation over wide temperature range of 25∼70 °C. By fabricating the lumped-EML submodule, we experimentally show that a 3-dB bandwidth of over 70 GHz can be obtained up to 70 °C by optimizing the matching load resistance as well as lengths of bondwires, even with a lumped-EML featuring a moderate EAM length of 120 μm. Consequently, the fabricated lumped-EML submodule revealed clear optical eye patterns under 112-Gbaud PAM4 modulation after 2-km SMF transmissions.",

keywords = "4-level pulse amplitude modulation (PAM4), LC resonance, data center, electro-absorption modulator-integrated lasers (EML), equivalent circuit",

author = "Yun, \{Seok Jun\} and Han, \{Young Tak\} and Lee, \{Dong Hoon\} and Lee, \{Dong Hyo\} and Shin, \{Jang Uk\} and Park, \{Sang Ho\} and Hoon Kim and Yongsoon Baek",

note = "Publisher Copyright: {\textcopyright} 1983-2012 IEEE.",

year = "2025",

doi = "10.1109/JLT.2025.3580710",

language = "English",

volume = "43",

pages = "8050--8057",

journal = "Journal of Lightwave Technology",

issn = "0733-8724",

number = "17",

}

TY - JOUR

T1 - A Wide Temperature 112-Gbaud PAM4 Operation of Lumped-EML Submodule Using Resistance-Optimized LC Resonance Effect

AU - Yun, Seok Jun

AU - Han, Young Tak

AU - Lee, Dong Hoon

AU - Lee, Dong Hyo

AU - Shin, Jang Uk

AU - Park, Sang Ho

AU - Kim, Hoon

AU - Baek, Yongsoon

PY - 2025

Y1 - 2025

N2 - We present a high-speed (>70 GHz) lumped-EML submodule whose modulation bandwidth is enhanced by a resistance-optimized LC resonance effect. We perform an equivalent circuit analysis to determine the optimal value of a matching load resistance for 112-Gbaud PAM4 operation over wide temperature range of 25∼70 °C. By fabricating the lumped-EML submodule, we experimentally show that a 3-dB bandwidth of over 70 GHz can be obtained up to 70 °C by optimizing the matching load resistance as well as lengths of bondwires, even with a lumped-EML featuring a moderate EAM length of 120 μm. Consequently, the fabricated lumped-EML submodule revealed clear optical eye patterns under 112-Gbaud PAM4 modulation after 2-km SMF transmissions.

AB - We present a high-speed (>70 GHz) lumped-EML submodule whose modulation bandwidth is enhanced by a resistance-optimized LC resonance effect. We perform an equivalent circuit analysis to determine the optimal value of a matching load resistance for 112-Gbaud PAM4 operation over wide temperature range of 25∼70 °C. By fabricating the lumped-EML submodule, we experimentally show that a 3-dB bandwidth of over 70 GHz can be obtained up to 70 °C by optimizing the matching load resistance as well as lengths of bondwires, even with a lumped-EML featuring a moderate EAM length of 120 μm. Consequently, the fabricated lumped-EML submodule revealed clear optical eye patterns under 112-Gbaud PAM4 modulation after 2-km SMF transmissions.

KW - 4-level pulse amplitude modulation (PAM4)

KW - LC resonance

KW - data center

KW - electro-absorption modulator-integrated lasers (EML)

KW - equivalent circuit

UR - https://www.scopus.com/pages/publications/105008526429

U2 - 10.1109/JLT.2025.3580710

DO - 10.1109/JLT.2025.3580710

M3 - Journal article

AN - SCOPUS:105008526429

SN - 0733-8724

VL - 43

SP - 8050

EP - 8057

JO - Journal of Lightwave Technology

JF - Journal of Lightwave Technology

IS - 17

ER -

A Wide Temperature 112-Gbaud PAM4 Operation of Lumped-EML Submodule Using Resistance-Optimized LC Resonance Effect

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Keywords

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