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A Wide Temperature 112-Gbaud PAM4 Operation of Lumped-EML Submodule Using Resistance-Optimized LC Resonance Effect
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- Authors
- Seok-Jun Yun, Young-Tak Han, Dong-Hoon Lee, Dong-Hyo Lee, Jang-Uk Shin, Sang-Ho Park, Hoon Kim, Yongsoon Baek
- Issue Date
- 2025-09
- Citation
- Journal of Lightwave Technology, v.43, no.17, pp.8050-8057
- ISSN
- 0733-8724
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- 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.
- KSP Keywords
- 3-dB bandwidth, 70 GHz, High Speed, LC resonance, Modulation bandwidth, Wide temperature range, equivalent circuit analysis, eye patterns, load resistance, optimal value, resonance effect