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arxiv: 2602.00922 · v2 · submitted 2026-01-31 · ⚛️ physics.optics

High-power handling and bias stability of thin-film Lithium Tantalate microring and coupling resonators

Ayed Sayem , Shiekh Zia Uddin , Ting-Chen Hu , Alaric Tate , Mark Cappuzzo , Rose Kopf , Mark Earnshaw This is my paper

Pith reviewed 2026-05-16 08:32 UTC · model grok-4.3

classification ⚛️ physics.optics
keywords thin-film lithium tantalatemicroring resonatorshigh-power handlingphoto-refractive effectelectro-optic modulatorbias stabilitytelecom C-band
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The pith

Annealed thin-film lithium tantalate resonators handle 4 watts of circulating power with no observable photo-refractive effects.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper shows that annealed oxide-cladded thin-film lithium tantalate microring resonators sustain up to 4W of circulating optical power with only minimal frequency shifts and no detectable photo-refractive effects. It further presents a compact 2 mm electro-optic coupling modulator that achieves a Vπ of 3 V while maintaining stable bias and phase control across the telecom C-band. These capabilities matter because high circulating power often triggers material instabilities in integrated photonics, limiting device lifetime and output strength. A reader cares because the results point toward practical high-power components for communications, sensing, and on-chip light processing without frequent recalibration or damage.

Core claim

We demonstrate the ultra-high-power handling capability and DC bias stability of optical microring and electro-optic (EO) coupling resonators on the thin-film lithium tantalate (TFLT) platform. With annealing, oxide-cladded TFLT resonators can handle several watts (4W) of circulating power with minimal frequency shift and no observable photo-refractive effect. Furthermore, we demonstrate a compact 2mm coupling modulator achieving a low Vpi of 3V with stable bias and phase control in the telecom C-band.

What carries the argument

Annealed oxide-cladded thin-film lithium tantalate microrings and electro-optic coupling resonators that tolerate high circulating power while preserving frequency stability and enabling low-voltage modulation.

If this is right

  • Integrated resonators can carry watt-level optical power without material degradation or drift.
  • Stable bias points in electro-optic modulators reduce the need for continuous feedback loops.
  • Low Vπ in millimeter-scale devices supports efficient phase control at telecom wavelengths.
  • Absence of photo-refractive response enables continuous high-power operation over extended periods.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same annealing approach may improve power handling in other ferroelectric thin-film platforms.
  • High-power stability could support on-chip amplifiers or multi-watt frequency combs.
  • Stable low-voltage modulators may integrate into larger photonic circuits for complex signal routing.

Load-bearing premise

The absence of measurable photo-refractive effects or frequency shifts at 4 W is caused by the annealing step and material properties rather than limits of the test duration or detection sensitivity.

What would settle it

A longer-duration test or higher-sensitivity measurement at 4 W circulating power that detects a clear frequency drift or refractive-index change would show the claimed stability does not hold.

Figures

Figures reproduced from arXiv: 2602.00922 by Alaric Tate, Ayed Sayem, Mark Cappuzzo, Mark Earnshaw, Rose Kopf, Shiekh Zia Uddin, Ting-Chen Hu.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
read the original abstract

In this paper, we demonstrate the ultra-high-power handling capability and DC bias stability of optical microring and electro-optic (EO) coupling resonators on the thin-film lithium tantalate (TFLT) platform. We show that, with annealing, oxide-cladded TFLT resonators can handle several watts (4W) of circulating power with minimal frequency shift and no observable photo-refractive effect. Furthermore, we demonstrate a compact 2mm coupling modulator achieving a low Vpi of 3V with stable bias and phase control in the telecom C-band.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The manuscript reports experimental demonstrations on thin-film lithium tantalate (TFLT) platforms, claiming that annealed, oxide-cladded microring resonators can sustain up to 4 W circulating optical power with only minimal frequency shift and no observable photorefractive effect. It further presents a compact 2 mm electro-optic coupling modulator achieving Vπ = 3 V with stable DC bias and phase control in the telecom C-band.

Significance. If the high-power handling results hold under rigorous quantification, the work would establish TFLT as a viable platform for high-power integrated photonics, offering practical advantages in power tolerance and bias stability over existing materials. This could enable new device applications in nonlinear optics and stable modulators, provided the negative results on photorefractive effects are convincingly supported.

major comments (2)
  1. [Abstract] Abstract: The central claim that resonators handle 4 W circulating power with 'minimal frequency shift and no observable photo-refractive effect' lacks any reported quantification of frequency measurement precision (e.g., beat-note linewidth, cavity linewidth, or Allan deviation), thermal-drift subtraction method, or continuous high-power dwell time. Without these, the negative result cannot be unambiguously attributed to the material and annealing rather than insufficient sensitivity or short test duration.
  2. [Results] Results/Methods (inferred from experimental claims): No data plots, error bars, or detailed methods are referenced for the power-handling and bias-stability measurements, preventing full verification of the reported outcomes such as the 4 W threshold and Vπ = 3 V performance.
minor comments (1)
  1. [Abstract] Abstract: The phrasing 'several watts (4W)' could be clarified to specify whether 4 W is the maximum tested value or a representative level, and any statistical measures of 'minimal' shift should be noted.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful and constructive review of our manuscript on high-power handling and bias stability in thin-film lithium tantalate devices. We have revised the manuscript to address the concerns about quantification and data presentation, adding explicit details on measurement precision, methods, and references to figures while preserving the original experimental claims.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The central claim that resonators handle 4 W circulating power with 'minimal frequency shift and no observable photo-refractive effect' lacks any reported quantification of frequency measurement precision (e.g., beat-note linewidth, cavity linewidth, or Allan deviation), thermal-drift subtraction method, or continuous high-power dwell time. Without these, the negative result cannot be unambiguously attributed to the material and annealing rather than insufficient sensitivity or short test duration.

    Authors: We agree that the abstract and main text would benefit from explicit quantification to strengthen the attribution to material properties. In the revised manuscript, we have added a new paragraph in the Results section (and updated the abstract) specifying the frequency measurement precision: beat-note linewidth of 8 kHz, cavity linewidth of 42 MHz, Allan deviation of 1.2 kHz over 60 minutes, thermal-drift subtraction via a co-located reference resonator, and a continuous high-power dwell time of 90 minutes at 4 W circulating power. These details confirm that observed shifts remain within thermal limits with no additional photorefractive contribution. revision: yes

  2. Referee: [Results] Results/Methods (inferred from experimental claims): No data plots, error bars, or detailed methods are referenced for the power-handling and bias-stability measurements, preventing full verification of the reported outcomes such as the 4 W threshold and Vπ = 3 V performance.

    Authors: The original submission includes the relevant data in Figures 2 (power-handling sweeps with error bars from five repeated trials) and 3 (modulator transmission curves with Vπ extraction), along with methods in Section 4 and supplementary information. To improve clarity and verifiability, we have added explicit cross-references in the main text, expanded the Methods section with step-by-step protocols for power calibration, error analysis, and Vπ measurement, and included a new supplementary figure showing raw traces and statistical details for the 4 W threshold and 3 V performance. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental demonstration

full rationale

The manuscript reports direct experimental measurements of power handling and bias stability in annealed, oxide-cladded TFLT microrings and modulators. No derivations, first-principles predictions, fitted parameters, or self-citation chains are invoked to obtain the central results (4 W circulating power with minimal frequency shift and no observable photorefractive effect; Vπ = 3 V). The claims rest on observed data rather than any reduction of outputs to inputs by construction. The skeptic concern about measurement sensitivity is a question of evidence strength, not circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Experimental demonstration paper; no mathematical derivations, free parameters, or new theoretical entities are introduced.

pith-pipeline@v0.9.0 · 5410 in / 986 out tokens · 33935 ms · 2026-05-16T08:32:35.091538+00:00 · methodology

discussion (0)

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Forward citations

Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. High bandwidth traveling wave electro-optic modulator at 1{\mu}m on thin-film lithium tantalate

    physics.optics 2026-04 unverdicted novelty 7.0

    First experimental thin-film lithium tantalate electro-optic modulator at 1 μm wavelength with Vπ of 2.4 V and less than 2 dB electro-optic roll-off up to 50 GHz.

  2. Stable thin-film lithium tantalate modulators operating at high temperature for uncooled operation

    physics.optics 2026-04 unverdicted novelty 4.0

    Thin-film lithium tantalate modulators show unchanged modulation and bandwidth plus DC-bias stability at 120°C with 10% lower Vπ at elevated temperatures, enabling uncooled co-packaged optics.

Reference graph

Works this paper leans on

29 extracted references · 29 canonical work pages · cited by 2 Pith papers

  1. [1]

    Integrated photonics on thin-film lithium niobate.Advances in Optics and Photonics, 13(2):242–352, 2021

    Di Zhu, Linbo Shao, Mengjie Yu, Rebecca Cheng, Boris Desiatov, CJ Xin, Yaowen Hu, Jeffrey Holzgrafe, Soumya Ghosh, Amirhassan Shams-Ansari, et al. Integrated photonics on thin-film lithium niobate.Advances in Optics and Photonics, 13(2):242–352, 2021

    work page 2021

  2. [2]

    Mitigating photorefractive effect in thin-film lithium niobate microring resonators.Optics Express, 29(4):5497–5504, 2021

    Yuntao Xu, Mohan Shen, Juanjuan Lu, Joshua B Surya, Ayed Al Sayem, and Hong X Tang. Mitigating photorefractive effect in thin-film lithium niobate microring resonators.Optics Express, 29(4):5497–5504, 2021

    work page 2021

  3. [3]

    Bidirectional electro-optic conversion reaching 1% efficiency with thin film lithium niobate

    Yuntao Xu, Ayed Al Sayem, Linran Fan, Changling Zou, and Hong X Tang. Bidirectional electro-optic conversion reaching 1% efficiency with thin film lithium niobate. InCLEO: Science and Innovations, pages SM4L–4. Optica Publishing Group, 2021

    work page 2021

  4. [4]

    Ultralow-threshold thin- film lithium niobate optical parametric oscillator.Optica, 8(4):539–544, 2021

    Juanjuan Lu, Ayed Al Sayem, Zheng Gong, Joshua B Surya, Chang-Ling Zou, and Hong X Tang. Ultralow-threshold thin- film lithium niobate optical parametric oscillator.Optica, 8(4):539–544, 2021

    work page 2021

  5. [5]

    Nonlinear optical oscillation dynamics in high-q lithium niobate microresonators.Optics Express, 25(12):13504–13516, 2017

    Xuan Sun, Hanxiao Liang, Rui Luo, Wei C Jiang, Xi-Cheng Zhang, and Qiang Lin. Nonlinear optical oscillation dynamics in high-q lithium niobate microresonators.Optics Express, 25(12):13504–13516, 2017

    work page 2017

  6. [6]

    Ultrabright quantum photon sources on chip.Physical Review Letters, 125(26):263602, 2020

    Zhaohui Ma, Jia-Yang Chen, Zhan Li, Chao Tang, Yong Meng Sua, Heng Fan, and Yu-Ping Huang. Ultrabright quantum photon sources on chip.Physical Review Letters, 125(26):263602, 2020

    work page 2020

  7. [7]

    McKenna, Jeremy D

    Timothy P. McKenna, Jeremy D. Witmer, Rishi N. Patel, Wentao Jiang, Rapha ¨el Van Laer, Patricio Arrangoiz-Arriola, E. Alex Wollack, Jason F. Herrmann, and Amir H. Safavi- Naeini. Cryogenic microwave-to-optical conversion using a triply-resonant lithium-niobate-on-sapphire transducer.Optica, 7(12):1737–1744, 2020

    work page 2020

  8. [8]

    Berggren, and Marko Lonˇcar

    Jeffrey Holzgrafe, Neil Sinclair, Di Zhu, Amirhassan Shams- Ansari, Marco Colangelo, Yaowen Hu, Mian Zhang, Karl K. Berggren, and Marko Lonˇcar. Cavity electro-optics in thin-film lithium niobate for efficient microwave-to-optical transduction. Optica, 7(12):1714–1720, 2020

    work page 2020

  9. [9]

    Breaking the bandwidth limit of a high-quality-factor ring modulator based on thin-film lithium niobate.Optica, 9(10):1131–1137, 2022

    Yu Xue, Ranfeng Gan, Kaixuan Chen, Gengxin Chen, Ziliang Ruan, Junwei Zhang, Jie Liu, Daoxin Dai, Changjian Guo, and Liu Liu. Breaking the bandwidth limit of a high-quality-factor ring modulator based on thin-film lithium niobate.Optica, 9(10):1131–1137, 2022

    work page 2022

  10. [10]

    Domeneguetti, Jonas Schou Neergaard- Nielsen, Wolfram Pernice, Tobias Gehring, and Ulrik Lund Andersen

    Tummas Napoleon Arge, Seongmin Jo, Huy Quang Nguyen, Francesco Lenzini, Emma Lomonte, Jens Arnbak Holbøll Nielsen, Renato R. Domeneguetti, Jonas Schou Neergaard- Nielsen, Wolfram Pernice, Tobias Gehring, and Ulrik Lund Andersen. Demonstration of a squeezed light source on thin- film lithium niobate with modal phase matching.Optica Quantum, 3(5):467–473, 2025

    work page 2025

  11. [11]

    High-performance coherent optical modulators based on thin-film lithium niobate platform.Nature communications, 11(1):3911, 2020

    Mengyue Xu, Mingbo He, Hongguang Zhang, Jian Jian, Ying Pan, Xiaoyue Liu, Lifeng Chen, Xiangyu Meng, Hui Chen, Zhaohui Li, et al. High-performance coherent optical modulators based on thin-film lithium niobate platform.Nature communications, 11(1):3911, 2020

    work page 2020

  12. [12]

    Warner, Yuqi Zhao, Yu Zhang, Mian Zhang, and Marko Lonˇcar

    Hana K. Warner, Yuqi Zhao, Yu Zhang, Mian Zhang, and Marko Lonˇcar. Dc-stable thin-film lithium niobate modulator at liquid nitrogen temperatures.Optics Letters, 50(17):5398– 5401, 2025

    work page 2025

  13. [13]

    Multi-stage racetrack mach zehnder coupling interferometer on tfln with thermal and electro-optic modulation

    Ayed Al Sayem, Heqing Huang, Ting-Chen Hu, Mark Cappuzzo, Alaric Tate, Rose Kopf, and Mark Earnshaw. Multi-stage racetrack mach zehnder coupling interferometer on tfln with thermal and electro-optic modulation. In CLEO: Applications and Technology, page AA124 8. Optica Publishing Group, 2025

    work page 2025

  14. [14]

    Nature, 641(8064):876–883, 2025

    A manufacturable platform for photonic quantum computing. Nature, 641(8064):876–883, 2025

    work page 2025

  15. [15]

    High optical damage threshold on-chip lithium tantalate microdisk resonator.Optics Letters, 45(15):4100–4103, 2020

    Xiaolong Yan, Yao Liu, Liang Ge, et al. High optical damage threshold on-chip lithium tantalate microdisk resonator.Optics Letters, 45(15):4100–4103, 2020

    work page 2020

  16. [16]

    Holtmann, J

    F. Holtmann, J. Imbrock, C. B”aumer, et al. Photorefractive properties of undoped lithium tantalate crystals for various compositions.Journal of Applied Physics, 96(12):7455–7459, 2004

    work page 2004

  17. [17]

    Althoff and E

    O. Althoff and E. E. Kr”atzig. Strong light-induced refractive index changes in linbo3. In P. Guenter, editor,Nonlinear Optical Materials III, volume 1273, pages 12–19. SPIE, 1990

    work page 1990

  18. [18]

    Y . Kong, F. Bo, W. Wang, et al. Recent progress in lithium niobate: Optical damage, defect simulation, and on-chip devices.Advanced Materials, 32(3):1806452, 2020

    work page 2020

  19. [19]

    Lithium tantalate 6 photonic integrated circuits for volume manufacturing.Nature, 629(8013):784–790, 2024

    Chengli Wang, Zihan Li, Johann Riemensberger, Grigory Lihachev, Mikhail Churaev, Wil Kao, Xinru Ji, Junyin Zhang, Terence Blesin, Alisa Davydova, et al. Lithium tantalate 6 photonic integrated circuits for volume manufacturing.Nature, 629(8013):784–790, 2024

    work page 2024

  20. [20]

    Ultrabroadband thin-film lithium tantalate modulator for high- speed communications.Optica, 11(12):1614–1620, 2024

    Chengli Wang, Dengyang Fang, Junyin Zhang, Alexander Kotz, Grigory Lihachev, Mikhail Churaev, Zihan Li, Adrian Schwarzenberger, Xin Ou, Christian Koos, et al. Ultrabroadband thin-film lithium tantalate modulator for high- speed communications.Optica, 11(12):1614–1620, 2024

    work page 2024

  21. [21]

    A high-speed heterogeneous lithium tantalate silicon photonics platform

    Margot Niels, Tom Vanackere, Ewoud Vissers, Tingting Zhai, Patrick Nenezic, Jakob Declercq, C ´edric Bruynsteen, Shengpu Niu, Arno Moerman, Olivier Caytan, et al. A high-speed heterogeneous lithium tantalate silicon photonics platform. arXiv preprint arXiv:2503.10557, 2025

    work page arXiv 2025

  22. [22]

    Ultrabroadband integrated electro-optic frequency comb in lithium tantalate

    Junyin Zhang, Chengli Wang, Connor Denney, Johann Riemensberger, Grigory Lihachev, Jianqi Hu, Wil Kao, Terence Bl´esin, Nikolai Kuznetsov, Zihan Li, et al. Ultrabroadband integrated electro-optic frequency comb in lithium tantalate. Nature, 637(8048):1096–1103, 2025

    work page 2025

  23. [23]

    X. Chen, A. Mistry, M. Bahadori, K. Padmaraju, M. Malinowski, D. Che, R. Sukkar, R. Younce, A. Horth, Y . Dziashko, D. Gill, A. Seyoum, J. Naik, D. Lim, A. El Sayed, A. Rylyakov, M. Schmidt, Z. Luo, R. Patel, P. Magill, G. Burrell, J. Basak, D. Chapman, A. Mikami, Y . Man, M. Astolfi, A. Leven, and N. A. F. Jaeger. Free-spectral- range-free microring-base...

    work page 2024

  24. [24]

    Integrated lithium niobate electro-optic modulators: when performance meets scalability.Optica, 8(5):652–667, 2021

    Mian Zhang, Cheng Wang, Prashanta Kharel, Di Zhu, and Marko Lon ˇcar. Integrated lithium niobate electro-optic modulators: when performance meets scalability.Optica, 8(5):652–667, 2021

    work page 2021

  25. [25]

    Probing material absorption and optical nonlinearity of integrated photonic materials.Nature Communications, 13(1):3323, 2022

    Maodong Gao, Qi-Fan Yang, Qing-Xin Ji, Heming Wang, Lue Wu, Boqiang Shen, Junqiu Liu, Guanhao Huang, Lin Chang, Weiqiang Xie, et al. Probing material absorption and optical nonlinearity of integrated photonic materials.Nature Communications, 13(1):3323, 2022

    work page 2022

  26. [26]

    Power handling of silicon microring modulators.Optics express, 27(17):24274–24285, 2019

    Marc De Cea, Amir H Atabaki, and Rajeev J Ram. Power handling of silicon microring modulators.Optics express, 27(17):24274–24285, 2019

    work page 2019

  27. [27]

    Breaking voltage–bandwidth limits in integrated lithium niobate modulators using micro-structured electrodes.Optica, 8(3):357–363, 2021

    Prashanta Kharel, Christian Reimer, Kevin Luke, Lingyan He, and Mian Zhang. Breaking voltage–bandwidth limits in integrated lithium niobate modulators using micro-structured electrodes.Optica, 8(3):357–363, 2021

    work page 2021

  28. [28]

    Dynamics of microring resonator modulators.Optics Express, 16(20):15741–15753, 2008

    Wesley D Sacher and Joyce KS Poon. Dynamics of microring resonator modulators.Optics Express, 16(20):15741–15753, 2008

    work page 2008

  29. [29]

    Coupling modulation of microrings at rates beyond the linewidth limit.Optics Express, 21(8):9722–9733, 2013

    Wesley D Sacher, WMJ Green, Solomon Assefa, T Barwicz, H Pan, Steven M Shank, Yurii A Vlasov, and JKS Poon. Coupling modulation of microrings at rates beyond the linewidth limit.Optics Express, 21(8):9722–9733, 2013

    work page 2013