Pith Number

pith:SCYFVXPN

pith:2026:SCYFVXPNFXW7XJS7IDWJRSP6QB

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FPGA-Based Experimental Analysis of Fixed-Point Precision Impact on SOP Estimation in Coherent Communications Receivers

Aleksandr Donodin, Geraldo Gomes, Hani Kbashi, Ian Phillips, Jaroslaw E. Prilepsky, Mikael Mazur, Pedro Freire, Rafael Vieira, Sergei K. Turitsyn, Shekhar Saxena, Stylianos Sygletos

At 7-bit fixed-point precision the noise floor drops 100x and angular error 63% in FPGA MIMO equalizers for coherent receivers, yet communication performance saturates as hardware complexity grows.

arxiv:2605.17521 v1 · 2026-05-17 · eess.SP

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Claims

C1strongest claim

At 7-bit fixed-point precision the noise floor drops 100x and angular error 63%, but the communication performance saturates while the hardware complexity rises.

C2weakest assumption

The FPGA implementation and measurement setup isolate the effects of fixed-point quantization from other implementation artifacts, calibration errors, or channel-specific conditions in the coherent receiver.

C3one line summary

FPGA experiments show 7-bit fixed-point MIMO equalizer cuts noise floor 100x and angular error 63% but saturates communication performance with rising hardware complexity.

References

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[1] Mecozzi et al., ``Polarization sensing using submarine optical cables,'' Optica 8, 788-795 (2021) 2021

[2] Mazur et al., ``Submarine Cable Deep-Ocean Observation of Mega-Thrust Earthquake and Tsunami with 44,000 100-m Spaced Sensors,`` arXiv:2509.24813

[3] Optical polarization–based seismic and water wave sensing on transoceanic cables 2021

[4] Mazuret al., ``Transoceanic phase and polarization fiber sensing using real-time coherent transceiver,'' OFC, Optica, 2022, p 2022

[5] Kikuchi, ``Performance analyses of polarization demultiplexing based on constant-modulus algorithm in digital coherent optical receivers,'' Opt 2011

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Receipt and verification

First computed	2026-05-20T00:04:43.654967Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

90b05added2dedfba65f40ec98c9fe8046d8b993b514a016533192bc5e1347ad

Aliases

arxiv: 2605.17521 · arxiv_version: 2605.17521v1 · doi: 10.48550/arxiv.2605.17521 · pith_short_12: SCYFVXPNFXW7 · pith_short_16: SCYFVXPNFXW7XJS7 · pith_short_8: SCYFVXPN

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/SCYFVXPNFXW7XJS7IDWJRSP6QB \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 90b05added2dedfba65f40ec98c9fe8046d8b993b514a016533192bc5e1347ad

Canonical record JSON

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  "metadata": {
    "abstract_canon_sha256": "d84a34e9349c01c74472bc2c869a0706eebdfe37569544629209b06277fb1c8d",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "eess.SP",
    "submitted_at": "2026-05-17T16:07:29Z",
    "title_canon_sha256": "4f0226592cfec012516b92fd2f80ce508436563413307594cc6cfa04ee881c09"
  },
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  "source": {
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    "kind": "arxiv",
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}