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REVIEW 2 major objections 6 minor 29 references

GHz fundamental mode-locking of a highly integrated Er-doped all-fiber ring laser

T0 review · 2 major / 6 minor · reviewed 2026-08-12 · deepseek-v4-flash

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Pith's one-line read All-fiber ring laser mode-locks at 1.0282 GHz fundamental rate

desk verdict A credible all-fiber ring Er laser with 1.028 GHz fundamental repetition rate, but the record claim needs direct proof that the measured line is the fundamental and not a harmonic. read the letter →

arxiv 2411.16059 v2 pith:MAEDKD4P submitted 2024-11-25 physics.optics

Maolin Dai , Bowen Liu , Yifan Ma , Ruoao Yang , Zhigang Zhang , Sze Yun Set , Shinji Yamashita This is my paper · ORCID
classification physics.optics PACS 42.55.Wd42.60.Fc
keywords mode-lockedfiberlaserEr-dopedGHzrepetitionratefundamentalmode-lockingcarbonnanotubesaturableabsorberall-fiberringintegratedcavityrelativeintensitynoise
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

This paper reports an all-fiber erbium ring laser whose pulse train repeats at 1.0282 GHz, the first time a passively mode-locked all-fiber ring cavity has passed the 1 GHz fundamental-repetition-rate mark. The authors achieve this by merging the isolator, output coupler, and pump/signal multiplexer into one polarization-insensitive module and depositing the carbon-nanotube saturable absorber directly on the fiber connectors, leaving a 20 cm cavity with no passive fiber. They measure 682 fs sech-squared pulses at 1562 nm with 80 dB RF signal-to-noise ratio and an integrated relative intensity noise of 0.049% over 1 MHz to 10 Hz. If correct, the result shows that ring-cavity geometry no longer caps all-fiber Er-doped fundamental repetition rates at a few hundred megahertz, and that a fully integrated cavity can reach the GHz regime with modest pump power.

What carries the argument

The load-bearing object is the PI-TIWDM, a single polarization-insensitive module that integrates a unidirectional isolator, a 10% output tap, and a 980/1550 nm wavelength-division multiplexer, together with the carbon-nanotube saturable absorber film deposited directly on the fiber connector faces. This in-line package removes all passive fiber from the ring, so the 20 cm cavity is almost entirely active gain fiber and the round-trip time is short enough for a 1.0282 GHz fundamental repetition rate. The argument relies on a real saturable absorber self-starting at modest pump power in a short cavity, whereas the cited NPE-based GHz lasers require free-space polarization optics and multi-watt pumps.

What would settle it

Measure the ring's optical round-trip time independently, for example by time-of-flight of a short probe pulse through the 20 cm cavity or by resolving the physical length and group index with reflectometry. If the measured round-trip time is not 0.98 ns, the 1.0282 GHz line is a harmonic order rather than the fundamental, and the central claim would need revision; a search for a subharmonic beat below 1 GHz under high-sensitivity RF detection would settle the same question.

Watch

Extended reading notes

Core claim

The paper's central claim is that an all-fiber ring laser can be mode-locked at a fundamental repetition rate above 1 GHz when every cavity function is integrated into a single in-line device. The authors demonstrate a 20 cm ring built around a PI-TIWDM, a polarization-insensitive component that combines a unidirectional isolator, a 10% output tap, and a 980/1550 nm wavelength-division multiplexer, spliced to commercial Er-doped fiber with a carbon-nanotube saturable absorber sandwiched between physical-contact connectors. Output pulses are 682 fs wide at 1562 nm, the repetition rate is 1.0282 GHz, and the estimated cavity dispersion of -3700 $fs^{2}$ places the laser in the soliton regime. The laser self-starts at about 222 mW pump power, delivers 1.65 mW average output and 1.62 pJ pulse energy, and the authors report an RF SNR of 80 dB with integrated RMS RIN of 0.049% from 1 MHz down to 10 Hz, reaching the shot-noise limit above roughly 300 kHz. They compare these numbers with previous all-fiber ring lasers at 447 MHz, 500 MHz, and 384 MHz, and with a 1 GHz non-all-fiber NPE laser, and conclude that the all-integration cavity design is what allows the fundamental rate to exceed 1 GHz in an all-fiber ring.

Load-bearing premise

Everything rests on the assumption that the 1.0282 GHz line really is the fundamental round-trip rate of the 20 cm cavity; the paper infers this from the nominal cavity length and the 0.98 ns pulse spacing but does not measure the optical round-trip time directly.

Editorial extensions

If this is right

  • All-fiber ring erbium lasers can now be considered in the >1 GHz fundamental-repetition-rate regime, removing the ring-geometry ceiling that previously stood near 500 MHz for all-fiber implementations.
  • The measured 80 dB RF SNR and 0.049% integrated RIN imply the output is stable enough to serve as a seed for amplification, compression, or frequency-comb applications without immediate active stabilization.
  • Because the mode-locker is integrated on standard fiber connectors, the same cavity layout should transfer to other gain fibers, other wavelengths, and other real saturable absorbers.
  • Reducing the size of the TIWDM and further shortening the fiber should push the fundamental repetition rate toward roughly 2 GHz, as the authors estimate.
  • The low pump threshold of about 200 mW, compared with multi-watt pumps used in NPE-based GHz lasers, makes compact diode-pumped GHz oscillators a practical target.

Reading between the lines

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

  • The low pump threshold and short cavity suggest that real-saturable-absorber integration, rather than NPE with free-space optics, is the more scalable route to compact low-cost GHz oscillators, but the paper does not directly compare long-term environmental stability of the two approaches.
  • The fundamental-order identification was inferred from the nominal 20 cm cavity length and the 0.98 ns pulse spacing; an independent measurement of the optical round-trip time would convert that inference into a demonstrated fact.
  • The connector-deposited CNT-SA has a measured non-saturable loss of 53.6%, so substantially raising output power may be possible by reducing that loss independently of any cavity redesign.
  • If the cavity is shortened further toward 2 GHz, the gain per round trip will drop, and the practical limit may be set by the erbium absorption length rather than by the saturable absorber; the paper gives no data on how close 20 cm is to that limit.
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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

2 major / 6 minor

Summary. The authors report a compact all-fiber Er-doped ring laser in which a polarization-insensitive tap/isolator/WDM module (PI-TIWDM) and a carbon-nanotube saturable absorber are integrated into a cavity stated to be 20 cm long. They observe self-starting mode-locking at 1562 nm with 682 fs pulses, a repetition rate of 1.0282 GHz, an RF SNR of 80 dB, and an integrated RIN of 0.049% over [1 MHz, 10 Hz]. The central claim is that this is the first all-fiber ring laser with fundamental repetition rate exceeding 1 GHz.

Significance. If the fundamental-repetition-rate identification is correct, this is a notable advance: the all-integration cavity design is a genuine engineering contribution, and the measured RF SNR and RIN, including RIN reaching the shot-noise limit above 300 kHz, are well-documented and support stable mode-locking. The paper also provides a useful comparison table of high-repetition-rate ring lasers. However, the novelty claim hinges on the 1.0282 GHz line being the cavity fundamental, a point that is not independently verified and is in tension with the stated cavity length.

major comments (2)
  1. [§2 and §3] The stated cavity length of 20 cm is inconsistent with the claimed fundamental repetition rate of 1.0282 GHz. For an all-silica fiber cavity with n≈1.46, a 20 cm physical length gives a fundamental round-trip frequency f = c/(2nL) ≈ 514 MHz, whereas the measured 1.0282 GHz line would require a cavity of roughly 10 cm. The 0.98 ns pulse interval in Fig. 5(b) is consistent with either a 1.028 GHz fundamental in a ~10 cm cavity or a ~514 MHz fundamental with two pulses per round trip. The paper reports no independent measurement of the round-trip time, so the possibility that the 1.0282 GHz line is the second harmonic is not excluded. Please provide a direct cavity-length measurement (e.g., a calibrated length perturbation or reflectometry) or reconcile the length estimate with the repetition rate; the central record claim depends on this.
  2. [§3, Fig. 5(d)] The absence of a subharmonic RF line at ~514 MHz should not be taken as decisive evidence for fundamental operation, because regular harmonic mode-locking can suppress subharmonic peaks. The authors should either demonstrate a positive identification of the fundamental (for instance, by adding a known fiber length and observing the decrease of the 1.0282 GHz frequency, or by measuring the cavity round-trip time with a distinct method) or explicitly acknowledge the residual ambiguity in the text.
minor comments (6)
  1. [§3] The output power is stated as 1.65 mW in one sentence and 1.67 mW in the next paragraph; please correct this inconsistency.
  2. [§3, Fig. 5 caption] The text says 'Figures 5(d) and the inset show the RF spectra' with RBWs of 100 Hz and 30 kHz, but the caption labels (c) as the 100-Hz RBW spectrum and (d) as the 30-kHz RBW spectrum; please verify the cross-references and inset labeling.
  3. [Table 1] The F.R.R. for 'This work' is listed as '1 GHz'; for consistency with the rest of the paper, use '1.028 GHz'.
  4. [§2] The geometry is unclear: the text says the whole cavity is 20 cm, the PI-TIWDM is 3.5 cm, and the total fiber length should be 18.5 cm, which sums to 22 cm; please clarify whether the 20 cm includes the device or is the package length, and what fraction of the length is actually optical path.
  5. [§1] The sentence 'no NPE lasers achieve repetition rates over 500 MHz with all-fiber configuration' is immediately preceded by a discussion of a 500-MHz laser; rephrase to 'exceeding 500 MHz' to avoid ambiguity.
  6. [References] Reference [25] appears to be an unpublished or preprint manuscript; please provide a journal or arXiv identifier if available.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: the 1.0282 GHz repetition rate is a direct measurement; the cavity-length estimate is an independent consistency check, not a fitted input.

full rationale

The paper's central claim—a 1.0282 GHz fundamental repetition rate in an all-fiber ring laser—rests on direct RF-spectrum and oscilloscope measurements, not on any fitted parameter or derived quantity. The CNT-SA modulation depth (2.2%) and non-saturable loss (53.6%) are fitted from the I-scan but are not used to predict the repetition rate. The 20 cm cavity-length estimate is an independent physical estimate used only to label the measured RF line as the fundamental; even if that identification were imperfect, it would be a verification gap, not circular reasoning. Self-citations (e.g., Ref. [20] for the 783 MHz laser and CNT-SA fabrication, Ref. [27] for the I-scan method) provide context and methodology but are not load-bearing for the GHz result. No equation in the paper reduces to its own input, and no fitted quantity is renamed as a prediction. The potential concern about harmonic versus fundamental operation is a measurement-assurance issue, not a circularity issue, so the circularity score is 0.

Assumptions & free parameters 2 free parameters · 4 assumptions · 0 invented entities

The central claim is empirical; the analysis mainly relies on standard soliton pulse assumptions and a nominal cavity length. The fitted SA parameters characterize the mode locker but are not inputs to the repetition-rate result.

free parameters (2)
  • CNT-SA modulation depth = 2.2%
    Obtained by fitting the I-scan nonlinear transmission curve (Fig. 2); characterizes the saturable absorber but does not determine the GHz repetition rate.
  • CNT-SA non-saturable loss = 53.6%
    Obtained from the same fitting curve; not central to the repetition-rate claim.
assumptions (4)
  • standard math The autocorrelation trace can be fitted with a sech2 pulse shape, so the pulse width is AC FWHM divided by 1.54.
    Section 3 states the AC trace is well fitted by a sech2 curve and uses the 1.54 conversion factor. This is a standard assumption for soliton pulses.
  • domain assumption The commercial EDF GVD of -20 fs^2/mm and the 18.5 cm fiber length give anomalous dispersion and soliton operation.
    Section 2 uses these values to estimate a cavity dispersion of -3700 fs^2 and to expect soliton mode-locking.
  • domain assumption The nonlinear transmission measured on a separate passive patch cord is representative of the CNT-SA inside the laser cavity.
    Section 2 says the SA is fabricated on a passive fiber patch cord under the same conditions and used to infer the in-cavity saturation behavior.
  • domain assumption The nominal 20 cm cavity length and group index correspond to the measured 1.0282 GHz repetition rate as the fundamental round-trip frequency.
    Section 2 estimates the cavity length as 20 cm, and Section 3 identifies the RF peak as fundamental without an independent round-trip time measurement.

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Cite this review

Pith. "Pith review of GHz fundamental mode-locking of a highly integrated Er-doped all-fiber ring laser." pith.science (2026). https://pith.science/paper/MAEDKD4P

@misc{pith2026241116059,
  author       = {Pith},
  title        = {Pith review of: GHz fundamental mode-locking of a highly integrated Er-doped all-fiber ring laser},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/MAEDKD4P}},
  note         = {Machine review of arXiv:2411.16059}
}
read the original abstract

High repetition rate ultrafast fiber lasers are important tools for both fundamental science and industry applications. However, achieving over GHz repetition rate in passively mode-locked fiber ring lasers is still challenging. Here, we demonstrate the first ring-cavity Er-doped fiber laser that achieves over GHz fundamental repetition rate by using an all-integration cavity design. In the proposed laser oscillator, all functions are integrated into one device, making it an ultra-compact laser cavity. The laser is mode-locked by carbon nanotubes (CNTs) film that is directly deposited on the pigtail active fiber connectors. The laser produces ultrafast optical pulses at 1562 nm, with a pulse width of 682 fs and a fundamental repetition rate of 1.028 GHz with improved performance. Stable and low-noise mode-locking is characterized by high signal-to-noise ratio (SNR) radiofrequency signal and low relative intensity noise (RIN). The proposed all-integration laser design may serve as a reference for compact fiber ring lasers using other mode-locking mechanisms or at diverse wavelengths.

Figures

Figures reproduced from arXiv: 2411.16059 by the authors.

Figure 1
Figure 1. Setup of the proposed ultrafast all-fiber ring laser with repetition rate exceeding GHz: (a) Open loop state, (b) close loop state. The PI-TIWDM integrates the functions of polarization-insensitive isolator, 10% output coupler and 980/1550 nm WDM. CNT-SA is sandwiched between two PC connectors. (c) Image of the PC connector with CNT-SA. (d) Image of the PC connector without CNT-SA. The setup of the proposed all-fibe… view at source ↗
Figure 2
Figure 2. [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. (a) Power and (b) spectral evolution in the process of increasing pump power. When pump power reaches 222 mW, the laser enters the mode-locking regime with self-starting. In the process of increasing pump power, the variations in center wavelength and 3-dB bandwidth are recorded as [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗

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Reference graph

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