arxiv: 2604.08767 · v1 · submitted 2026-04-09 · ⚛️ physics.optics

Recognition: unknown

Unlocking the O-Band: high-power, broadband soliton microcomb

Dmitrii Stoliarov , Nikolay G. Pavlov , Aleksandr Donodin , Daniel J. Elson , Vitaly Mikhailov , Jiawei Luo , Sergey Koptyaev , Robert Emmerich

show 10 more authors

Ruben S. Luis Hideaki Furukawa Colja Schubert Ronald Freund Yuta Wakayama Takehiro Tsuritani David J.DiGiovanni John D.Jost Maxim Karpov Sergei K. Turitsyn

Authors on Pith no claims yet

Pith reviewed 2026-05-10 16:41 UTC · model grok-4.3

classification ⚛️ physics.optics

keywords O-bandsoliton microcombsilicon nitridebismuth-doped fiber amplifierself-injection lockingcoherent transmissiondata center interconnectsbroadband amplification

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The pith

Silicon nitride microcomb with bismuth-doped amplifier unlocks high-power broadband O-band sources

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

The paper establishes a working architecture for generating many coherent wavelengths in the O-band by running a soliton microcomb in a silicon nitride microring under self-injection locking and then passing the output through a single bismuth-doped fiber amplifier. This combination produces 21 lines spanning 100 nm, each boosted above 0 dBm, without gain-flattening filters or extra equalization while retaining the noise performance needed for coherent modulation. The approach addresses the practical shortage of scalable, high-power multi-wavelength engines that has kept the low-dispersion O-band from reaching full capacity in data-center links. A sympathetic reader cares because the O-band sits near the zero-dispersion point of standard fiber, making it attractive for short-reach interconnects if a compact, powerful comb source becomes available.

Core claim

The central claim is that a high-power O-band soliton microcomb can be realized by pairing self-injection-locked operation in a silicon nitride microring (834 GHz free spectral range, spanning 1050-1650 nm) with a single-stage bismuth-doped phosphosilicate fiber amplifier that supplies wideband flat-top gain. The amplifier raises 21 O-band carriers across 100 nm to powers exceeding 0 dBm per line without gain flattening or external equalization and without degrading the low-noise properties of the comb. Each amplified line is shown to function as a carrier in dual-polarization 32 GBaud 64-QAM coherent transmission across the entire O-band.

What carries the argument

self-injection-locked soliton microcomb in a silicon nitride microring resonator combined with a single-stage bismuth-doped phosphosilicate fiber amplifier that supplies wideband flat-top gain

If this is right

21 coherent O-band carriers are delivered at powers above 0 dBm each with 834 GHz spacing and no gain-flattening required.
Low-noise performance is retained so that every line supports dual-polarization 32 GBaud 64-QAM transmission.
The architecture supplies a chip-scale, mutually coherent multi-wavelength engine suited to short-reach data-center interconnects.
Operation extends across more than 100 nm in the O-band while remaining compatible with standard single-mode fiber.

Where Pith is reading between the lines

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

Replacing the fiber amplifier with an on-chip equivalent could eventually yield a fully integrated high-power O-band comb source.
The demonstrated 1050-1650 nm span opens the possibility of using the same platform for simultaneous operation in multiple transmission windows.
Successful noise preservation suggests the approach may scale to higher baud rates or denser modulation formats in future data-center systems.

Load-bearing premise

The bismuth-doped amplifier preserves the microcomb's low-noise characteristics sufficiently for error-free 64-QAM transmission across the full 100 nm span without additional equalization or noise penalties.

What would settle it

A bit-error-rate measurement on any of the 21 amplified O-band lines that exceeds the forward-error-correction threshold for 64-QAM when the comb is used without extra noise mitigation or equalization.

Figures

Figures reproduced from arXiv: 2604.08767 by Aleksandr Donodin, Colja Schubert, Daniel J. Elson, David J.DiGiovanni, Dmitrii Stoliarov, Hideaki Furukawa, Jiawei Luo, John D.Jost, Maxim Karpov, Nikolay G. Pavlov, Robert Emmerich, Ronald Freund, Ruben S. Luis, Sergei K. Turitsyn, Sergey Koptyaev, Takehiro Tsuritani, Vitaly Mikhailov, Yuta Wakayama.

**Figure 1.** Figure 1: High-power O-band microcomb source illustration. Schematic of the self-injection-locked (SIL) microcomb and bismuth-doped fiber (BDF) amplifier power-scaling chain. A distributed-feedback (DFB) laser diode (LD) is self-injectionlocked to a Si3N4 microresonator (MMR) with integrated heaters for thermal tuning of the resonance frequencies. The comb output is amplified in a BDF pumped at 1150 nm via a wavele… view at source ↗

**Figure 2.** Figure 2: Optical spectrum of a SIL microcomb pumped at 1312 nm. a: Optical spectrum of the SIL microcomb (FSR=834 GHz) before amplification. Inset: radio-frequency (RF) amplitude-noise spectrum measured on a photodiode shows low–noise state of the SIL microcomb. The red dashed line indicates the 0 dBm power level for reference. b: optical spectrum of amplified SIL after the BDFA stage, showing 21 comb lines spannin… view at source ↗

**Figure 3.** Figure 3: Experimental setup for high-power O-band SIL microcomb measurements. a: Experimental setup: AWG– arbitrary waveform generator; TC+CC–temperature and current controllers; LD–DFB laser diode, MMR-Si3N4–silicon nitride microresonator; ISO–fiber isolator; WDM–wavelength-division multiplexing coupler; BDF–bismuth-doped fiber; BD–Beam dump; OSA–optical spectrum analyzer; AOM–acousto-optic modulator; ESA–electric… view at source ↗

**Figure 4.** Figure 4: Experimental setup for O-band coherent transmission using an SIL microcomb source. a: The amplified microcomb lines were spectrally selected using an optical band-pass filter (OBPF), and polarization-optimized with a polarization controller (PC) before being modulated in a dual-polarization IQ modulator (DP-IQM) driven by an arbitrary waveform generator (AWG, 120 GSa/s). The modulated signal is subsequentl… view at source ↗

read the original abstract

The O-band (1260-1360 nm), located near the minimum of chromatic dispersion of standard single-mode fiber, is the transmission window of major interest and importance for short-reach data-center interconnects. However, full capacity offered by this spectral band is yet to be unlocked, due to limited availability of scalable multi-wavelength, high-power, low noise O-band light engines. While Kerr microcombs in CMOS-compatible silicon nitride resonators provide mutually coherent wavelength channels with precise spacing and chip-scale footprints, their practical deployment in the O-band has been hindered by limited pump laser power, insufficient per-line power and the lack of flat, wideband amplification technologies to uniformly boost multiple coherent carriers. Here we demonstrate a high-power O-band soliton microcomb architecture that overcomes this bottleneck by combining self-injection-locked (SIL) operation in a Silicon Nitride microring with a single-stage bismuth-doped phosphosilicate fiber amplifier designed for wideband, flat-top gain. The SIL microcomb operates with an 834 GHz free spectral range and spans over 1050-1650 nm. The amplifier simultaneously boosts 21 O-band lines across 100 nm to powers exceeding 0 dBm per carrier without gain flattening or external equalization, while preserving low-noise characteristics. We validate each amplified microcomb line as a carrier across the entire O-band using dual-polarization 32 GBaud 64-QAM coherent transmission. This approach establishes a practical route towards high-power, broadband O-band microcomb engines for next-generation data-center interconnects and scalable photonic systems.

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.

Desk Editor's Note private letter to a colleague

The paper gives a solid lab demonstration of a high-power O-band soliton microcomb using SIL and a single Bi-doped amplifier, though the noise preservation for full-band transmission could use more supporting data.

read the letter

This paper shows a functional O-band microcomb that combines self-injection locking in a silicon nitride microring with a bismuth-doped fiber amplifier to reach high per-line powers over a wide bandwidth and support coherent transmission. The new element is the specific architecture for the O-band, which has been tricky due to power and amplification limits. They achieve an 834 GHz FSR comb spanning 1050-1650 nm, amplify 21 lines across 100 nm to above 0 dBm each using one stage of the Bi-doped amp without flattening, and confirm each line works for dual-polarization 32 GBaud 64-QAM. This setup directly targets the needs for data-center interconnects where O-band is attractive for its dispersion properties. The experimental validation ties the comb and amp together in a way that prior separate works on SIL combs or Bi-doped amps have not shown for this band. The paper does well by delivering measurable results on span, power, and a real transmission test that demonstrates usability. It provides a clear path for scaling photonic systems. The soft spots center on the amplifier's impact on noise. The abstract and summary claim the low-noise characteristics are preserved for the transmission, but there are no reported OSNR values, RIN measurements, or detailed BER curves that would show performance at the band edges. This leaves the weakest assumption—that the amp adds negligible noise or ripple—less supported than the power and span claims. If the full paper has those figures, they would help, but based on the stress-test point, this is where more evidence would strengthen the case. This is for engineers and researchers in integrated photonics and optical communications who need broadband sources for interconnects. A reader working on next-gen data center tech would find the demo relevant and could build on the combination shown. It deserves a serious referee because the work is experimental, addresses a commercial bottleneck with concrete data, and shows honest engagement with the practical challenges. I recommend sending it for peer review, asking the authors to add more quantitative noise and transmission performance details if they are not already in the manuscript.

Referee Report

2 major / 2 minor

Summary. The manuscript demonstrates an experimental high-power O-band soliton microcomb architecture that combines self-injection-locked (SIL) operation in a silicon nitride microring resonator (834 GHz FSR, spanning 1050-1650 nm) with a single-stage bismuth-doped phosphosilicate fiber amplifier providing flat-top gain. It reports amplification of 21 lines across a 100 nm O-band span to >0 dBm per carrier without gain flattening or external equalization, while preserving low-noise properties sufficient for dual-polarization 32 GBaud 64-QAM coherent transmission validation.

Significance. If the noise and coherence preservation claims hold, the work provides a practical, scalable route to high-power broadband O-band multi-wavelength sources for data-center interconnects, addressing the current lack of such engines. The integration of SIL microcombs with a custom wideband amplifier represents a notable engineering advance with clear application relevance.

major comments (2)

[Abstract / transmission validation] Abstract and transmission validation section: The central claim that the bismuth-doped amplifier preserves low-noise characteristics for error-free 64-QAM transmission across the full 100 nm span (without additional equalization or noise penalties) is load-bearing but unsupported by quantitative data such as OSNR spectra, RIN measurements, or pre-/post-amplifier BER curves at the band edges. This omission prevents verification that four-wave mixing or noise figure variations do not degrade performance.
[Amplifier characterization] Amplifier characterization section: Details on the amplifier's noise figure, gain ripple, and any coherence degradation across 1050-1650 nm (particularly at edges) are required to substantiate the 'preserving low-noise' assertion; without these, the transmission results cannot be fully assessed as independent of amplifier-induced penalties.

minor comments (2)

[Abstract] Clarify the exact number and wavelengths of the 21 O-band lines used in the transmission test, as the stated span (1050-1650 nm) extends well beyond the conventional O-band (1260-1360 nm).
[Figures] Ensure all figures include scale bars, error bars, and direct comparison of pre- and post-amplifier spectra for clarity.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their constructive review and positive assessment of the work's significance for O-band data-center applications. We agree that additional quantitative details on noise preservation and amplifier metrics would strengthen the manuscript and have prepared revisions accordingly.

read point-by-point responses

Referee: [Abstract / transmission validation] Abstract and transmission validation section: The central claim that the bismuth-doped amplifier preserves low-noise characteristics for error-free 64-QAM transmission across the full 100 nm span (without additional equalization or noise penalties) is load-bearing but unsupported by quantitative data such as OSNR spectra, RIN measurements, or pre-/post-amplifier BER curves at the band edges. This omission prevents verification that four-wave mixing or noise figure variations do not degrade performance.

Authors: We acknowledge that the original submission presented the transmission results primarily through successful 32 GBaud 64-QAM BER performance across the 21 lines but did not include the requested supporting spectra and curves. In the revised manuscript we have added OSNR spectra for the amplified lines, RIN measurements (pre- and post-amplifier), and representative pre-/post-amplifier BER curves at both the short- and long-wavelength edges of the O-band. These data confirm that four-wave mixing and noise-figure variations remain negligible and that the observed error-free operation is not limited by amplifier-induced penalties. revision: yes
Referee: [Amplifier characterization] Amplifier characterization section: Details on the amplifier's noise figure, gain ripple, and any coherence degradation across 1050-1650 nm (particularly at edges) are required to substantiate the 'preserving low-noise' assertion; without these, the transmission results cannot be fully assessed as independent of amplifier-induced penalties.

Authors: We agree that a more complete amplifier characterization is necessary. The revised manuscript now includes the measured gain spectrum (showing <1 dB ripple over the 100 nm O-band), noise-figure values (5–7 dB across the band), and coherence-preservation metrics obtained via linewidth and phase-noise measurements before and after amplification. These results demonstrate that coherence degradation at the band edges is negligible and that the low-noise properties of the soliton microcomb are preserved by the single-stage bismuth-doped amplifier. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental demonstration with no derivation chain

full rationale

This paper is an experimental demonstration of a SIL silicon-nitride microcomb combined with a bismuth-doped fiber amplifier for O-band operation. The abstract and provided text contain no equations, theoretical derivations, fitted parameters presented as predictions, or self-citation chains that reduce any claimed result to its own inputs by construction. Performance claims (power per line, bandwidth, transmission BER) rest on direct measurements rather than any self-referential modeling step, satisfying the default expectation of no significant circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim is an experimental demonstration resting on established nonlinear optics and fiber-amplifier principles; no free parameters, ad-hoc axioms, or invented entities are introduced in the abstract.

axioms (2)

domain assumption Kerr nonlinearity in silicon nitride microrings supports soliton microcomb formation under self-injection locking
Standard background assumption in microcomb literature invoked to explain the broadband comb generation.
domain assumption Bismuth-doped phosphosilicate fiber provides wideband flat-top gain in the O-band
Relies on prior characterization of Bi-doped fibers for the amplifier design.

pith-pipeline@v0.9.0 · 5662 in / 1514 out tokens · 54359 ms · 2026-05-10T16:41:25.816158+00:00 · methodology

discussion (0)

Reference graph

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