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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.11044 |
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| _version_ | 1866917669970640896 |
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| author | Chen, Alexander Zhang, Meng Crowley, Daniel Gangi, Nicholas Begović, Amir Huang, Zhaoran Rena |
| author_facet | Chen, Alexander Zhang, Meng Crowley, Daniel Gangi, Nicholas Begović, Amir Huang, Zhaoran Rena |
| contents | In this research, we developed a low-power silicon photonics foundry-fabricated slow-light thermal phase shifter (SLTPS) where the slow-light (SL) effect is achieved using an integrated Bragg grating (BG) waveguide. Heating the grating induces a red shift in the transmission spectrum, leading to an increased group index $n_g$ during operation, which facilitates a further reduction in the voltage needed for a $π$ phase shift, i.e. $V_π$. Additionally, we investigated a compact Mach-Zehnder Interferometer (MZI) that incorporates the SLTPS in both arms with a phase shifter length of 50 $μ$m. A detailed theoretical analysis was conducted to address the non-idealities of the SL-MZI due to uneven optical power splitting and unbalanced loss in the two MZI arms. The $V_π$ and power consumption for a $π$ phase shift $(P_π)$ of the SL-MZI were quantified for operation in the slow light regime, demonstrating a $V_π$ of 1.1 V and a $P_π$ of 3.63 mW at an operational wavelength near the photonic band edge. The figure of merit (FOM) $P_π \times τ$ is commonly used to assess the performance of thermal optical switches. The SL-MZI in this work has achieved a low $P_π \times τ$ of 5.1 mW $μ$s. Insertion loss of the SL-MZI ranges from 1.3 dB to 4.4 dB depending on the operation wavelength, indicating a trade-off with the $V_π$ reduction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_11044 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Silicon Photonics Foundry Fabricated, Slow-Light Enhanced, Low Power Thermal Phase Shifter Chen, Alexander Zhang, Meng Crowley, Daniel Gangi, Nicholas Begović, Amir Huang, Zhaoran Rena Optics In this research, we developed a low-power silicon photonics foundry-fabricated slow-light thermal phase shifter (SLTPS) where the slow-light (SL) effect is achieved using an integrated Bragg grating (BG) waveguide. Heating the grating induces a red shift in the transmission spectrum, leading to an increased group index $n_g$ during operation, which facilitates a further reduction in the voltage needed for a $π$ phase shift, i.e. $V_π$. Additionally, we investigated a compact Mach-Zehnder Interferometer (MZI) that incorporates the SLTPS in both arms with a phase shifter length of 50 $μ$m. A detailed theoretical analysis was conducted to address the non-idealities of the SL-MZI due to uneven optical power splitting and unbalanced loss in the two MZI arms. The $V_π$ and power consumption for a $π$ phase shift $(P_π)$ of the SL-MZI were quantified for operation in the slow light regime, demonstrating a $V_π$ of 1.1 V and a $P_π$ of 3.63 mW at an operational wavelength near the photonic band edge. The figure of merit (FOM) $P_π \times τ$ is commonly used to assess the performance of thermal optical switches. The SL-MZI in this work has achieved a low $P_π \times τ$ of 5.1 mW $μ$s. Insertion loss of the SL-MZI ranges from 1.3 dB to 4.4 dB depending on the operation wavelength, indicating a trade-off with the $V_π$ reduction. |
| title | Silicon Photonics Foundry Fabricated, Slow-Light Enhanced, Low Power Thermal Phase Shifter |
| topic | Optics |
| url | https://arxiv.org/abs/2405.11044 |