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REVIEW 3 major objections 4 minor 19 references

On the Feasibility of SCL-Band Transmission over G.654.E-Compliant Long-Haul Fibre Links

T0 review · 3 major / 4 minor · reviewed 2026-08-06 · deepseek-v4-flash

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Pith's one-line read This paper reports the first SCL-band long-haul transmission over G.654.E-compliant fibre, reaching 100.85 Tb/s of GMI over 1552 km despite the fibre's 1520 nm cutoff, and shows the link can match a Raman-amplified G.652.D system with…

desk verdict A credible first SCL-band long-haul result on G.654.E fiber; the headline rate is GMI-based with ASE-emulated WDM neighbors, but the qualitative feasibility claim holds. read the letter →

arxiv 2507.21865 v1 pith:5GUMLXT5 submitted 2025-07-29 physics.optics cs.SYeess.SY

Jiaqian Yang , Eric Sillekens , Ronit Sohanpal , Mingming Tan , Dini Pratiwi , Henrique Buglia , Romulo Aparecido , John D. Downie
show 5 more authors
Sergejs Makovejs Lidia Galdino Wladek Forysiak Polina Bayvel Robert I. Killey
This is my paper · ORCID
classification physics.opticscs.SYeess.SY
keywords SCL-bandtransmissionG.654.Efibreultra-widebandWDMstimulatedRamanscatteringlumpedamplificationgeometricconstellationshapingmultipathinterference1552km
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper sets out to show that G.654.E-compliant fibre, despite a cutoff wavelength near 1520 nm that intrudes into the S-band, can support ultra-wideband S+C+L transmission over long haul. It reports the first such demonstration: 112 GBd channels over 1552 km of G.654.E fibre, with 100.85 Tb/s of total GMI (generalised mutual information, a rate estimate) and 92.8 Tb/s decoded when E-band Raman pumps are used, and 88.8 Tb/s decoded with only lumped amplifiers. The practical point is that the fibre's ultra-low loss and larger effective area compensate for its higher water-absorption peak and weaker Raman response, so a G.654.E link with plain lumped amplification can match a Raman-amplified G.652.D link. If correct, this would remove one of the main complexities of long-haul ultra-wideband systems.

What carries the argument

The central object is the G.654.E-compliant fibre span itself: a 86.2 km Vascade EX2500 fibre with about 0.148 dB/km attenuation at 1550 nm and about 125 square micrometres of effective area. Its low loss and low nonlinearity are what allow a DFA-only SCL-band link to match a Raman-amplified G.652.D system, while its 1520 nm cutoff does not produce a measurable MPI penalty. The experimental machinery around it is a recirculating loop with three lumped gain blocks (an S-band TDFA plus C- and L-band EDFAs), optional backward E-band Raman pumps, and spectrally-shaped ASE noise standing in for co-propagating WDM channels; a simplified ISRS-aware Gaussian-noise model sets the pump powers and per-band launch powers. These components together determine how much of the reported throughput comes from the fibre's linear advantages rather than from Raman gain.

What would settle it

Transmit a fully populated or densely sampled grid of real 112 GBd modulated channels across S, C, and L bands over the same 18-span G.654.E loop and compare per-channel SNR and total GMI; if the real full-grid S-band SNR or total throughput falls below the shaped-ASE result by more than the system margin, the reported 100.85 Tb/s is not a faithful capacity for this fibre.

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Extended reading notes

Core claim

In this paper, the authors claim that G.654.E-compliant fibre can support SCL-band long-haul transmission despite a cutoff wavelength around 1520 nm. Using 18 spans of Vascade EX2500 fibre totalling 1552 km, they transmit 112 GBd channels across 15.08 THz of S+C+L spectrum and obtain 100.85 Tb/s of total GMI with E-band Raman assistance (92.8 Tb/s after decoding), and 88.8 Tb/s decoded with only lumped S-, C-, and L-band amplifiers. The decoded throughput with lumped amplification is effectively equal to the 89.9 Tb/s decoded from a Raman-amplified low-water-peak G.652.D link on the same span length, while the GMI comparison is 97.02 Tb/s versus 97.90 Tb/s. The authors conclude that the fibre's ultra-low loss and larger effective area compensate for its higher water-absorption peak and roughly halved Raman gain coefficient, making DFA-only UWB long-haul transmission viable on G.654.E.

Load-bearing premise

The 100.85 Tb/s headline assumes that spectrally-shaped ASE noise faithfully emulates the co-propagating WDM channels, so that the measured SNR and GMI reflect true multi-channel nonlinear propagation rather than a stand-in that could miss cross-phase modulation and four-wave mixing.

Editorial extensions

If this is right

  • With Raman pumps, the G.654.E link achieves 100.85 Tb/s GMI (92.8 Tb/s decoded) over 1552 km across 15.08 THz of S+C+L spectrum at 112 GBd.
  • Without Raman, the same G.654.E link delivers 88.8 Tb/s decoded, comparable to the 89.9 Tb/s of a Raman-amplified G.652.D link, so distributed Raman is not required to match standard fibre performance.
  • Signals below the 1520 nm cutoff suffer negligible multipath-interference penalty, so the S-band remains usable on cutoff-shifted G.654.E fibre.
  • E-band Raman pumping mainly helps the short-wavelength S-band, improving average GMI by 0.86 bit/4D-symbol for 1480 to 1500 nm channels, while C- and L-band performance is largely unchanged.
  • These results position G.654.E fibre as suitable for DFA-only long-haul ultra-wideband transmission, reducing amplifier complexity relative to Raman-based UWB links.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Editorial extension: since co-propagating neighbours were shaped ASE rather than live modulated channels, the 100.85 Tb/s GMI is a projected capacity; a fully populated WDM comb could shift SNR through cross-phase modulation and four-wave mixing that broadband noise does not reproduce.
  • Editorial extension: the same fibre's weaker Raman response means designs that retain distributed Raman should re-optimise pump wavelengths around the E-band water peak rather than simply scaling G.652.D pump plans.
  • Editorial extension: if production G.654.E fibres replicate this span loss and effective area, ultra-wideband long-haul repeater sites could drop Raman hardware altogether, replacing a roughly 1.5 W pump stage with lumped DFA-only gain blocks.
  • Editorial extension: the simplified ISRS GN-model optimisation could be validated against per-channel SNR in a fully populated system; agreement would make the model a practical design tool for G.654.E UWB links.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 4 minor

Summary. The paper reports an experimental S+C+L-band (SCL-band) transmission over 1552 km of G.654.E-compliant Vascade EX2500 fibre, using 112 GBd channels with one real modulated channel under test per run and all co-propagating WDM channels emulated by spectrally shaped ASE. The authors report 100.85 Tb/s total throughput estimated from GMI with Raman amplification, 97.02 Tb/s without Raman, and decoded net rates of 92.8 Tb/s and 88.8 Tb/s, respectively. These results are compared with a G.652.D low-water-peak fibre link with Raman amplification, which gave 89.9 Tb/s decoded rate. The central claim is that G.654.E-compliant fibre, despite its ~1520 nm cutoff, supports long-haul SCL-band transmission with performance comparable to G.652.D with distributed Raman amplification, but without requiring Raman pumps.

Significance. If the result holds, it is a significant experimental demonstration: it would show that ultra-low-loss, large-effective-area G.654.E fibre can extend three-band WDM transmission to long-haul distances with only lumped amplification, potentially simplifying UWB system architectures. The paper has clear strengths: it directly compares G.654.E and G.652.D fibres in the same recirculating-loop setup, reports Raman on-off gain measurements, distinguishes GMI estimates from decoded net rates, and includes both Raman-amplified and DFA-only scenarios. The main caveat is that the headline throughput is a GMI sum over single-channel measurements with ASE-emulated neighbours, so the fully populated WDM performance is not directly measured; this is the load-bearing assumption that needs explicit validation or qualification.

major comments (3)
  1. [Experimental setup (Fig. 2) and Results (Fig. 6)] The reported totals of 100.85 Tb/s and 97.02 Tb/s are computed by summing per-channel GMI values measured with only one real 112 GBd channel per run, while all co-propagating WDM channels are emulated by spectrally shaped ASE. The paper does not demonstrate that ASE loading reproduces the inter-channel nonlinear effects of real modulated neighbours, specifically cross-phase modulation, four-wave mixing, ISRS, and, in the below-cutoff S-band, MPI. Since the central claim concerns the feasibility and throughput of a fully populated SCL-band WDM system, this assumption is load-bearing. A validation experiment with two or more real modulated neighbours, or a measurement of nonlinear-interference scaling with channel count for ASE versus modulated loading, is needed before the headline throughput can be taken at face value.
  2. [Results (Fig. 6)] No repeated measurements, error bars, or uncertainty estimates are reported. The claims of negligible MPI penalty, the 0.86 bit/4D-symbol S-band improvement with Raman, and the 0.67 bit/4D-symbol C-band advantage of G.654.E over G.652.D rest on single measurements per scenario. Given the small differences involved, the absence of any repeatability or statistical confidence statement makes it difficult to assess whether these comparisons are significant.
  3. [Results, decoded net rate] The definition of 'decoded net data rate' is incomplete. The text states only that pilot overhead was deducted; it does not specify the FEC code rate, FEC overhead, or any other overheads included in the adaptive rate decoding. Since the abstract and conclusion emphasize throughput, the relation between the GMI-based estimate (100.85 Tb/s) and the decoded rate (92.8 Tb/s) should be stated precisely.
minor comments (4)
  1. [Fig. 2 inset] The inset shows '116 GHz' while the text states a baud rate of 112 GBaud; please clarify whether 116 GHz is the WDM grid spacing and, if so, state the number of WDM channels and the total bandwidth accordingly.
  2. [Fig. 1] The band labels 'SCL', 'CLU', 'SCLU', and 'SCLUX' in the figure legend are not defined in the caption; please define them for readers unfamiliar with the notation.
  3. [Abstract and Conclusion] The abstract correctly qualifies the headline as '100.8 Tb/s (GMI)', but the conclusion repeats 'more than 100 Tb/s throughput' without the GMI qualifier; recommend consistently noting that this figure is a GMI-based estimate, not a decoded rate.
  4. [References [16] and modulation formats] The geometric shaping parameters for GS-16-QAM and GS-64-QAM (e.g., number of constellation points, shaping block length) are not given; adding these details would improve reproducibility.

Circularity Check

0 steps flagged · score 2.0 of 10

No significant circularity: the 100.8 Tb/s headline is a measured GMI sum, not a model output; the ISRS-GN model is used only to set operating powers, and self-citations are not load-bearing.

full rationale

The central claim is an experimental measurement: the abstract's '100.8 Tb/s (GMI) over 1552 km' is obtained by summing the per-channel GMI values measured after 18 recirculations and shown in Fig. 6(a). No equation in the paper derives this throughput from the model; the only model usage is operational, namely 'pump powers and signal launch power per band were optimised for both fibre types using a simplified ISRS GN model [19] to maximise throughput'. That optimisation sets the operating point but does not generate the reported rates, which would be falsified by a different measured SNR/GMI. The self-cited refs [19] (same-group GN model) and [11] (MPI-penalty-free S-band transmission over G.654.E) are supporting or corroborating, not the source of the headline quantity. The spectrally-shaped ASE used to emulate co-propagating WDM channels is an experimental fidelity assumption about inter-channel nonlinear effects, not a circular reduction: the paper never defines the measured GMI in terms of the ASE loading, and the claim remains externally testable against a fully populated WDM experiment. Thus the derivation chain is self-contained as an experimental demonstration, with only minor self-citation that is not load-bearing.

Assumptions & free parameters 2 free parameters · 3 assumptions · 0 invented entities

No new physical entities are introduced. The central claim rests on standard hardware assumptions and on two operational choices (launch powers, pump powers) made via a self-authored simulation model, both listed above.

free parameters (2)
  • Per-band signal launch power = S 19.7 dBm, C 19.4 dBm, L 18.5 dBm (G.654.E); S 19.7, C 16.6, L 18.5 dBm (G.652.D)
    Chosen by optimization with the simplified ISRS GN model to maximize throughput; the throughput comparison depends on these operating points.
  • Raman pump powers = G.654.E: 3 pumps at ~500 mW each (max); G.652.D: 447, 501, 331, 224 mW
    Set to maximum for G.654.E and optimized for G.652.D; they determine the fairness of the with-Raman comparison.
assumptions (3)
  • domain assumption Shaped ASE noise faithfully emulates co-propagating WDM channels
    All WDM neighbours in the experiment are ASE emulation rather than real modulated channels (Experimental setup).
  • domain assumption Simplified ISRS GN model with per-band averaged gains/losses provides near-optimal power settings
    Used to set launch powers and pump powers; the model is from the same group (ref [19]) and is not independently validated here.
  • domain assumption Recirculating loop measurements represent straight-line transmission
    18 re-circulations can introduce loop-specific artefacts not present in a straight-line link; no loop-back penalty analysis is reported.

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Cite this review

Pith. "Pith review of On the Feasibility of SCL-Band Transmission over G.654.E-Compliant Long-Haul Fibre Links." pith.science (2026). https://pith.science/paper/5GUMLXT5

@misc{pith2026250721865,
  author       = {Pith},
  title        = {Pith review of: On the Feasibility of SCL-Band Transmission over G.654.E-Compliant Long-Haul Fibre Links},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/5GUMLXT5}},
  note         = {Machine review of arXiv:2507.21865}
}
read the original abstract

We demonstrate the first SCL-band long-haul transmission using G.654.E-compliant fibre, achieving 100.8 Tb/s (GMI) over 1552 km, despite its 1520 nm cutoff wavelength. Due to the fibre's ultra-low loss and low nonlinearity, the achievable-information-rate with lumped amplification is comparable to that of G.652.D-compliant fibre links with distributed-Raman-amplification.

Figures

Figures reproduced from arXiv: 2507.21865 by the authors.

Figure 1
Figure 1. Transmission distance, throughput, and spectral efficiency (SE) of recent long-haul transmission demonstrations using three or more optical bands. Solid markers: decoded net rate; open markers: rate from GMI. gain coefficient) and the presence of a higher wa￾ter absorption peak may reduce the efficiency of Raman amplification in G.654.E fibre, studies have shown that Raman pumping can still provide per￾formance gain… view at source ↗
Figure 2
Figure 2. Experimental setup for S+C+L-band long-haul transmission over 18×86.2 km G.654.E-compliant fibre. Inset: spectrum of channel under test (CUT). show the potential of this type of fibre for long-haul UWB optical transmission. Experimental setup The experiment carried out (shown in [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. Fibre attenuation at signal and Raman pump wavelengths. the same span length was used for comparison. Throughout the remainder of this paper, we refer to the Vascade EX2500 fibre and the low-water-peak fibre as G.654.E and G.652.D, respectively. The measured attenuation of the two fibres is shown in [PITH_FULL_IMAGE:figures/full_fig_p002_3.png] view at source ↗
Figures from the paper (3 more)
Figure 4
Figure 4. Figure 4: Raman on-off gain. fibre. The Raman on-off gain was measured using an optical spectrum analyser (OSA), as shown in [PITH_FULL_IMAGE:figures/full_fig_p003_4.png]
Figure 6
Figure 6. Figure 6: (a)-(c) Received SNR (left axis) and GMI (right axis) with different types of fibre, with or without Raman amplification. (d) Decoded data rate per channel for the 3 scenarios; inset received constellations: GS-16 QAM for the S-band and GS-64 QAM for the C- and L-band.…
Figure 5
Figure 5. Figure 5: Spectra at loop monitor, G.654.E fibre input and output. After DSP and deducting pilot overhead, the SNR and GMI for the G.654.E fibre transmission - with and without Raman amplification - are shown in [PITH_FULL_IMAGE:figures/full_fig_p003_5.png]

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Reference graph

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