High-efficiency compact optical transmitter with a total bit energy of 0.78 pJ/bit including silicon slow-light modulator and open-collector current-mode driver
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914183850754048 |
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| author | Kawahara, Keisuke Tsuchizawa, Tai Yamamoto, Noritsugu Maegami, Yuriko Yamada, Koji Hara, Shinsuke Baba, Toshihiko |
| author_facet | Kawahara, Keisuke Tsuchizawa, Tai Yamamoto, Noritsugu Maegami, Yuriko Yamada, Koji Hara, Shinsuke Baba, Toshihiko |
| contents | Increasing datacenter demands require power-efficient optical interconnects. However, a conventional standard transmitter using a silicon rib-waveguide Mach-Zehnder modulator and voltage-mode driver has low efficiency and consumes watt-class high power and occupies a several-square-millimeter footprint, which limits large-scale integration for parallel transmission. This paper presents a transmitter consisting of a compact photonic crystal waveguide (PCW) modulator and a current-mode open-collector driver. The PCW modulator is designed to have high impedance in addition to the slow-light effect. The driver connected to the modulator without termination resistors is optimized based on electronics-photonics co-simulations using a standard electronic circuit simulator with an in-house photonic model library. Co-packaging these dramatically reduces the power consumption to 50 mW and a bit energy to 0.78 pJ/bit at 64-Gbaud, and the footprint to 0.66 mm2. This result represents a significant advancement toward the integration of a large number of transmission channels with no temperature control. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_04820 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-efficiency compact optical transmitter with a total bit energy of 0.78 pJ/bit including silicon slow-light modulator and open-collector current-mode driver Kawahara, Keisuke Tsuchizawa, Tai Yamamoto, Noritsugu Maegami, Yuriko Yamada, Koji Hara, Shinsuke Baba, Toshihiko Optics Increasing datacenter demands require power-efficient optical interconnects. However, a conventional standard transmitter using a silicon rib-waveguide Mach-Zehnder modulator and voltage-mode driver has low efficiency and consumes watt-class high power and occupies a several-square-millimeter footprint, which limits large-scale integration for parallel transmission. This paper presents a transmitter consisting of a compact photonic crystal waveguide (PCW) modulator and a current-mode open-collector driver. The PCW modulator is designed to have high impedance in addition to the slow-light effect. The driver connected to the modulator without termination resistors is optimized based on electronics-photonics co-simulations using a standard electronic circuit simulator with an in-house photonic model library. Co-packaging these dramatically reduces the power consumption to 50 mW and a bit energy to 0.78 pJ/bit at 64-Gbaud, and the footprint to 0.66 mm2. This result represents a significant advancement toward the integration of a large number of transmission channels with no temperature control. |
| title | High-efficiency compact optical transmitter with a total bit energy of 0.78 pJ/bit including silicon slow-light modulator and open-collector current-mode driver |
| topic | Optics |
| url | https://arxiv.org/abs/2506.04820 |