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arxiv: 2503.09162 · v2 · submitted 2025-03-12 · ⚛️ physics.optics · cs.NI

Experimental Analysis of a Self-Coherent M-QAM Receiver by Means of Recurrent Optical Spectrum Slicing and Direct Detection

Kostas Sozos , Francesco Da Ros , Senior Member Optica , Metodi Yankov , Stavros Deligiannidis , George Sarantoglou , Charis Mesaritakis , Adonis Bogris
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Pith reviewed 2026-05-23 00:57 UTC · model grok-4.3

classification ⚛️ physics.optics cs.NI
keywords self-coherent receiverdirect detectionrecurrent optical spectrum slicingQAMpower consumptionC-band transmissionconstellation shapingpluggables
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The pith

Recurrent optical spectrum slicing enables direct-detection reception of 32 Gbaud QAM over 75 km with drive voltages below Vπ/3.

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

The paper shows experimentally that recurrent optical spectrum slicing can support self-coherent reception of quadrature amplitude modulation using direct detection and only linear equalization. It transmits and receives 32 Gbaud QAM-4 and QAM-16 over fiber distances of 25 km, 50 km, and 75 km in the C-band. The receiver operates successfully with modulator driving swings less than one-third the full voltage required by conventional coherent systems. Geometric constellation shaping improves the results, and the design projects more than 40% lower power consumption than lightweight coherent solutions for 1.6T pluggables.

Core claim

We experimentally demonstrate 32 Gbaud QAM-4/16 for 25 km, 50 km and 75 km in the C-band aided by a linear digital equalization and the use of programmable photonics as recurrent optical spectrum slicers. We showcase successful detection with driving swings below Vπ/3 in contrast to the full swing required by conventional coherent transceivers. We further improve the system performance utilizing geometric constellation shaping. Finally, we explore the potential power consumption improvement for the next-generation 1.6T pluggables, showcasing over 40% reduction.

What carries the argument

Recurrent optical spectrum slicing (ROSS) implemented via programmable photonics as recurrent optical spectrum slicers, which performs repeated spectrum manipulation to recover phase information for direct-detection self-coherent reception.

If this is right

  • QAM-4 and QAM-16 at 32 Gbaud can be received over fiber spans up to 75 km using direct detection.
  • Modulator driving swings can be kept below Vπ/3 while still achieving successful detection.
  • Geometric constellation shaping provides measurable performance gains in the same setup.
  • Power consumption for next-generation 1.6T pluggables can be reduced by over 40% relative to the lightest reported coherent solutions.

Where Pith is reading between the lines

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

  • The approach could simplify transceiver hardware for metro and data-center links by lowering both voltage and DSP demands.
  • Integration into photonic integrated circuits would need separate verification beyond the current programmable-photonics lab bench.
  • The same slicing method might be tested at higher baud rates or modulation orders to check scalability limits.

Load-bearing premise

The ROSS accelerator and linear equalization will maintain the demonstrated performance when integrated into commercial pluggables under real-world temperature variation, component aging, and non-ideal fiber links.

What would settle it

A bit-error-rate measurement of the receiver inside a temperature-cycled packaged pluggable module transmitting over deployed fiber would settle whether the lab results hold in commercial conditions.

read the original abstract

High order modulation formats constitute the most prominent way for increasing spectral efficiency in transmission systems. Coherent transceivers that support such higher order formats require heavy digital signal processing (DSP), which increases the power consumption of coherent pluggables, well above the intensity modulation and direct detection (IM/DD) counterparts. Self-coherent or phase retrieval methods have emerged as potential solutions, trying to combine the merits of coherent technology with the simplicity of direct detection. In this work, we experimentally demonstrate the reception of quadrature amplitude modulation (QAM) modulation formats based on direct detection aided by the recurrent optical spectrum slicing (ROSS) photonic accelerator, utilizing minimal DSP and low modulator driving voltages. We experimentally demonstrate 32 Gbaud QAM-4/16 for 25 km, 50 km and 75 km in the C-band aided by a linear digital equalization and the use of programmable photonics as recurrent optical spectrum slicers. We showcase successful detection with driving swings below V{\pi}/3 in contrast to the full swing required by conventional coherent transceivers. We further improve the system performance utilizing geometric constellation shaping. Finally, we explore the potential power consumption improvement for the next-generation 1.6T pluggables, showcasing over 40% reduction with respect to the most lightweight state of the art coherent solutions reported in literature

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 / 2 minor

Summary. The manuscript experimentally demonstrates reception of 32 Gbaud QAM-4/16 signals over 25 km, 50 km and 75 km fiber links in the C-band using a self-coherent architecture based on recurrent optical spectrum slicing (ROSS) with programmable photonics, direct detection, linear digital equalization, and drive voltages below Vπ/3. It reports performance gains from geometric constellation shaping and explores potential power savings exceeding 40% for 1.6T pluggables relative to lightweight coherent solutions in the literature.

Significance. If the transmission results hold under the reported conditions, the work offers a concrete experimental path toward lower-power, lower-DSP alternatives to coherent detection for metro/short-reach links by combining direct detection with a photonic accelerator; the multi-distance demonstrations and geometric shaping constitute measurable strengths.

major comments (2)
  1. [Power consumption analysis] Power consumption section: the central claim of 'over 40% reduction' for 1.6T pluggables is an unmeasured estimate that assumes negligible overhead from the ROSS hardware, linear equalization, and packaging; no direct power measurements, component-level budget, or validation under temperature/aging conditions are provided, rendering this load-bearing claim unsupported by experiment.
  2. [Experimental results] Experimental results section: while 32 Gbaud QAM-4/16 transmission over the three distances is stated as successful, the manuscript provides no quantitative BER curves, OSNR penalties, or statistical details on measurement repeatability, which are required to substantiate the 'successful detection' claim against conventional coherent benchmarks.
minor comments (2)
  1. The abstract and main text refer to 'minimal DSP' and 'linear digital equalization' without specifying the equalizer structure, tap count, or adaptation method; a short block diagram or equation would clarify the architecture.
  2. Notation for drive voltage (Vπ/3) should be cross-referenced to the modulator transfer curve or experimental setup figure for reproducibility.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments and the opportunity to improve the manuscript. We address each major comment point by point below.

read point-by-point responses

  1. Referee: [Power consumption analysis] Power consumption section: the central claim of 'over 40% reduction' for 1.6T pluggables is an unmeasured estimate that assumes negligible overhead from the ROSS hardware, linear equalization, and packaging; no direct power measurements, component-level budget, or validation under temperature/aging conditions are provided, rendering this load-bearing claim unsupported by experiment.

    Authors: We agree that the reported power savings figure is an estimate based on literature comparisons for coherent pluggables rather than direct measurements of the ROSS system. In the revised manuscript we will expand the power consumption section to explicitly list all assumptions, provide a component-level power budget table, qualify the >40% reduction as a potential value under the stated conditions, and note the absence of direct measurements as well as temperature/aging validation as limitations of the analysis. revision: yes

  2. Referee: [Experimental results] Experimental results section: while 32 Gbaud QAM-4/16 transmission over the three distances is stated as successful, the manuscript provides no quantitative BER curves, OSNR penalties, or statistical details on measurement repeatability, which are required to substantiate the 'successful detection' claim against conventional coherent benchmarks.

    Authors: We acknowledge that additional quantitative detail would strengthen the experimental claims. In the revised version we will add explicit BER curves versus received power for each fiber distance, report the corresponding OSNR penalties relative to back-to-back, and include information on the number of independent measurements performed together with repeatability statistics to facilitate comparison with coherent benchmarks. revision: yes

Circularity Check

0 steps flagged

No circularity detected; purely experimental demonstration with no derivations

full rationale

The paper reports experimental transmission results for 32 Gbaud QAM-4/16 over fiber distances using ROSS photonic slicing, linear equalization, and low drive voltages, plus geometric shaping. No mathematical derivations, fitted models, or equations are present that could reduce to self-defined inputs, fitted parameters renamed as predictions, or self-citation chains. The >40% power reduction figure is an exploratory comparison to external literature values rather than an internal derivation or prediction from the paper's own data. All load-bearing claims rest on direct experimental measurements, making the work self-contained against external benchmarks with no circular steps.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Experimental demonstration paper; no free parameters, mathematical axioms, or invented entities are introduced.

pith-pipeline@v0.9.0 · 5812 in / 1058 out tokens · 28773 ms · 2026-05-23T00:57:46.034713+00:00 · methodology

discussion (0)

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Reference graph

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