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Express"],"published-print":{"date-parts":[[2026,7,27]]},"abstract":"<jats:p>This paper proposes a measurement-driven pre-compensation scheme based on single-pulse (SP) probing for high-fidelity estimation of the aggregate transceiver front-end response in bandwidth-limited coherent optical systems. By exploiting the temporal isolation of a single probe pulse, the proposed scheme enables accurate characterization of fine spectral ripples under finite laser linewidth, whereas conventional sequence-based schemes tend to lose such details. Numerical simulations further quantify the phase-noise robustness by showing a nearly constant normalized mean squared error (NMSE) of about -27 dB over a total linewidth sweep from 1 kHz to 100 MHz, corresponding to more than 14 dB lower NMSE than a training-sequence-based method at 10 MHz linewidth. Experiments using 60 Gbaud PDM-16QAM over a 300-km SSMF link further demonstrate that the proposed method effectively flattens the estimated front-end frequency response, thereby restoring the matched-filter gain and providing a launch power margin improvement of 0.62 dB at the 7% HD-FEC threshold compared with a conventional sequence-based scheme.<\/jats:p>","DOI":"10.1364\/oe.606531","type":"journal-article","created":{"date-parts":[[2026,7,9]],"date-time":"2026-07-09T11:00:09Z","timestamp":1783594809000},"page":"27802","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["High-fidelity front-end response estimation and pre-compensation for bandwidth-limited coherent systems using single-pulse probing"],"prefix":"10.1364","volume":"34","author":[{"given":"Ziang","family":"Chen","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05t8y2r12","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6195-0454","authenticated-orcid":true,"given":"Zhongxing","family":"Tian","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05t8y2r12","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zeyu","family":"Feng","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05t8y2r12","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongdong","family":"Zou","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05t8y2r12","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huan","family":"Huang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05t8y2r12","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi","family":"Cai","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05t8y2r12","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,7,17]]},"reference":[{"key":"oe-34-15-27802-R1","doi-asserted-by":"publisher","first-page":"1099","DOI":"10.1109\/JLT.2017.2662082","type":"journal-article","volume":"35","author":"Winzer","year":"2017","journal-title":"J. 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