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arxiv: 2604.12957 · v1 · submitted 2026-04-14 · ⚛️ physics.optics

Modal response sensitivity to polarization across photonic lantern architectures

Rodrigo Itzamn\'a Becerra-Deana , Joseph Lamarre , Rapha\"el Maltais-Tariant , Adam Zolnai , Nicolas Godbout , St\'ephane Virally , Caroline Boudoux This is my paper

Pith reviewed 2026-05-10 14:16 UTC · model grok-4.3

classification ⚛️ physics.optics
keywords photonic lanternspolarization sensitivitymode-selective lanternsmodal responsefiber opticsdouble-clad fibersoptical coupling
0
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The pith

Photonic lanterns with strong inter-port coupling have modal outputs highly sensitive to input polarization, while mode-selective versions with low coupling are nearly insensitive.

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

The paper compares the polarization dependence of modal responses in different 3-mode photonic lantern architectures fabricated from double-clad fibers. Strongly coupled symmetric lanterns show large variations in output based on the input light's polarization state. Lanterns with isolated ports or low coupling, such as mode-selective designs, maintain consistent responses regardless of polarization. This distinction is important for applications in optics where controlling or stabilizing the modal output is necessary. The work spans from fully symmetric to fully asymmetric structures to highlight the role of coupling.

Core claim

We demonstrate the high sensitivity of the output of photonic lanterns with strong coupling between their ports to the polarization of the input state. In contrast, ports with high isolation or low coupling, such as in mode-selective photonic lanterns, exhibit responses that are almost polarization independent.

What carries the argument

The level of coupling between the ports of the photonic lantern, which determines how much the modal response depends on input polarization.

If this is right

  • Applications using regular photonic lanterns may need to account for or control input polarization to achieve consistent modal outputs.
  • Mode-selective photonic lanterns offer a way to achieve polarization-independent modal responses.
  • The architecture choice influences the stability of the lantern's performance under varying input conditions.
  • Further studies could explore how to engineer specific coupling levels for desired polarization behaviors.

Where Pith is reading between the lines

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

  • Polarization sensitivity in coupled lanterns might be useful for developing new types of polarization analyzers or modulators in fiber systems.
  • This effect could have implications for the design of multimode fiber devices in telecommunications to minimize polarization-related losses or distortions.
  • Testing with different fiber materials could reveal if the sensitivity is general or specific to double-clad fibers.

Load-bearing premise

The differences in polarization sensitivity are caused by the varying degrees of inter-port coupling across the lantern architectures rather than by differences in fabrication or experimental setup.

What would settle it

Fabricating and testing a series of photonic lanterns with deliberately varied coupling strengths and measuring if the polarization sensitivity scales directly with the coupling level.

Figures

Figures reproduced from arXiv: 2604.12957 by Adam Zolnai, Caroline Boudoux, Joseph Lamarre, Nicolas Godbout, Rapha\"el Maltais-Tariant, Rodrigo Itzamn\'a Becerra-Deana, St\'ephane Virally.

Figure 1
Figure 1. Figure 1: Modal evolution in a three-mode photonic lantern. Left: simulated near-field intensity [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Schematic diagram of the optical system for polarization measurements, where PBS [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Measurements in the polarization analyzer. (a) The measurements done in the calibration, [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Optical intensity profile of each port of a standard 3-mode PL at five tested polarizations. [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: The optical intensity profile of each port of the same ABB PL at two wavelengths (a) [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: The optical intensity distribution for each port of two types of 3-mode PL (a) and (b). [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
Figure 2
Figure 2. Figure 2: Figure 7 illustrates the intensity profile of the two orthogonal polarization states when [PITH_FULL_IMAGE:figures/full_fig_p009_2.png] view at source ↗
Figure 7
Figure 7. Figure 7: Optical intensity profile in a MSPL when the two LP [PITH_FULL_IMAGE:figures/full_fig_p010_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Optical profile response at five different po [PITH_FULL_IMAGE:figures/full_fig_p012_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Optical profile response at five different [PITH_FULL_IMAGE:figures/full_fig_p012_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Optical profile response at five different po [PITH_FULL_IMAGE:figures/full_fig_p013_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Optical profile response at five different po [PITH_FULL_IMAGE:figures/full_fig_p013_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: Optical profile response at five different po [PITH_FULL_IMAGE:figures/full_fig_p014_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: Optical profile response at five different po [PITH_FULL_IMAGE:figures/full_fig_p014_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: Optical profile response at five different po [PITH_FULL_IMAGE:figures/full_fig_p015_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: Optical profile response at five different po [PITH_FULL_IMAGE:figures/full_fig_p015_15.png] view at source ↗
Figure 16
Figure 16. Figure 16: Optical profile response at five different po [PITH_FULL_IMAGE:figures/full_fig_p015_16.png] view at source ↗
Figure 17
Figure 17. Figure 17: Optical profile response at five different po [PITH_FULL_IMAGE:figures/full_fig_p016_17.png] view at source ↗
Figure 18
Figure 18. Figure 18: Optical profile response at five different po [PITH_FULL_IMAGE:figures/full_fig_p016_18.png] view at source ↗
Figure 19
Figure 19. Figure 19: Optical profile response at five different po [PITH_FULL_IMAGE:figures/full_fig_p017_19.png] view at source ↗
read the original abstract

This paper examines the polarization-dependent output of various types of 3-mode photonic lanterns fabricated using double-clad fibers. We explore the sensitivity of the modal response across several types of photonic lanterns, from the fully symmetric and strongly coupled structure of regular photonic lanterns to the fully asymmetric structure of mode-selective photonic lanterns. We demonstrate the high sensitivity of the output of photonic lanterns with strong coupling between their ports to the polarization of the input state. In contrast, ports with high isolation or low coupling, such as in mode-selective photonic lanterns, exhibit responses that are almost polarization independent.

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

1 major / 2 minor

Summary. The paper experimentally examines the polarization-dependent modal responses of 3-mode photonic lanterns fabricated from double-clad fibers. It compares regular lanterns with strong inter-port coupling against mode-selective lanterns with high isolation, claiming that the former exhibit high sensitivity of output modes to input polarization state while the latter show nearly polarization-independent responses.

Significance. If the central experimental contrast holds after addressing controls, the result would usefully inform photonic lantern design for applications requiring polarization stability, such as mode-division multiplexing. The work provides direct empirical comparison across architectures but lacks the statistical controls or parameter-free modeling that would strengthen its broader applicability.

major comments (1)
  1. [Experimental Results] Experimental Results section: the central claim that polarization sensitivity differences arise primarily from inter-port coupling strength is load-bearing but rests on comparison of two architectures that also differ systematically in fabrication method and fiber geometry. No repeated device fabrication runs, statistical variance across samples of each type, or explicit controls isolating coupling from birefringence/splice artifacts are presented, leaving open the possibility that observed contrasts are dominated by uncontrolled variations rather than coupling per se.
minor comments (2)
  1. [Figures and Methods] Figure captions and methods description lack explicit mention of error bars, number of measurements per device, or polarization state sampling details, which would aid reproducibility.
  2. [Section 3] Notation for modal responses (e.g., how output power is normalized across ports) could be clarified in the text to avoid ambiguity when comparing sensitivity across lantern types.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their constructive feedback on our manuscript. We address the major comment below and outline planned revisions to improve clarity on experimental controls and limitations.

read point-by-point responses

  1. Referee: Experimental Results section: the central claim that polarization sensitivity differences arise primarily from inter-port coupling strength is load-bearing but rests on comparison of two architectures that also differ systematically in fabrication method and fiber geometry. No repeated device fabrication runs, statistical variance across samples of each type, or explicit controls isolating coupling from birefringence/splice artifacts are presented, leaving open the possibility that observed contrasts are dominated by uncontrolled variations rather than coupling per se.

    Authors: We agree that the two lantern architectures differ in fabrication methods and fiber geometries, as these differences are inherent to achieving strong inter-port coupling in regular lanterns versus high isolation in mode-selective lanterns. The manuscript presents direct experimental comparisons showing high polarization sensitivity in the strongly coupled case and near-independence in the low-coupling case. While we did not conduct repeated fabrication runs or provide statistical variance across multiple samples of each type, the designs were chosen specifically to vary coupling strength as the primary parameter. In the revised manuscript, we will expand the Experimental Results section with additional discussion of how the architectures isolate coupling effects from other variables and will explicitly acknowledge the lack of multi-sample statistics as a limitation. We maintain that the central contrast is driven by coupling, as minor birefringence or splice variations would not systematically produce the observed architecture-dependent behavior, but we will add text addressing this possibility. revision: partial

Circularity Check

0 steps flagged

No circularity: experimental comparison of polarization responses in distinct photonic lantern architectures with no fitted models or self-referential derivations

full rationale

The paper presents direct experimental measurements of modal output sensitivity to input polarization across different photonic lantern types (regular strongly-coupled vs. mode-selective). No derivation chain, equations, fitted parameters, or predictions are described that could reduce to inputs by construction. The central claim rests on observed differences in fabricated devices rather than any mathematical reduction or self-citation load-bearing step. Self-citations, if present, are not invoked to justify uniqueness theorems or ansatzes that close the argument. This matches the default non-circular case for an experimental study.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; no theoretical model, equations, or new constructs are introduced. The work relies on standard assumptions of photonic lantern fabrication and modal decomposition techniques from prior literature.

pith-pipeline@v0.9.0 · 5417 in / 1037 out tokens · 41740 ms · 2026-05-10T14:16:39.304259+00:00 · methodology

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Reference graph

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