{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:VWEJID6KC4K3CO2WPBC2DD6GY6","short_pith_number":"pith:VWEJID6K","canonical_record":{"source":{"id":"2501.05979","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SP","submitted_at":"2025-01-10T14:08:25Z","cross_cats_sorted":[],"title_canon_sha256":"3203e96c02ee1207287c3877089030bba4a163a02ae947ea88679e7c2bcd5471","abstract_canon_sha256":"d774081d6c04f7bfd6cede15464465964b3450cab2520a0cb67caed092295647"},"schema_version":"1.0"},"canonical_sha256":"ad88940fca1715b13b567845a18fc6c7b91408d5709662a7b5daa777eb7fc1c6","source":{"kind":"arxiv","id":"2501.05979","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.05979","created_at":"2026-07-05T09:59:31Z"},{"alias_kind":"arxiv_version","alias_value":"2501.05979v1","created_at":"2026-07-05T09:59:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.05979","created_at":"2026-07-05T09:59:31Z"},{"alias_kind":"pith_short_12","alias_value":"VWEJID6KC4K3","created_at":"2026-07-05T09:59:31Z"},{"alias_kind":"pith_short_16","alias_value":"VWEJID6KC4K3CO2W","created_at":"2026-07-05T09:59:31Z"},{"alias_kind":"pith_short_8","alias_value":"VWEJID6K","created_at":"2026-07-05T09:59:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:VWEJID6KC4K3CO2WPBC2DD6GY6","target":"record","payload":{"canonical_record":{"source":{"id":"2501.05979","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SP","submitted_at":"2025-01-10T14:08:25Z","cross_cats_sorted":[],"title_canon_sha256":"3203e96c02ee1207287c3877089030bba4a163a02ae947ea88679e7c2bcd5471","abstract_canon_sha256":"d774081d6c04f7bfd6cede15464465964b3450cab2520a0cb67caed092295647"},"schema_version":"1.0"},"canonical_sha256":"ad88940fca1715b13b567845a18fc6c7b91408d5709662a7b5daa777eb7fc1c6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:59:31.044274Z","signature_b64":"Q3cT7nxnCgszKrSJP6q7GHbQkHWb2BfQTJzVpJDApGZeRstzQNVR5tIHAAQN7hFH+a8qJQ4kD8l6D85JRTTWCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ad88940fca1715b13b567845a18fc6c7b91408d5709662a7b5daa777eb7fc1c6","last_reissued_at":"2026-07-05T09:59:31.043849Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:59:31.043849Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2501.05979","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T09:59:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZKg+8gD8nQVdNAOVe5rQgNXgm+Ueb7n07EO11aPcBbmVn0Vi1uXcT3sHyHHCgAq0lHnxrxIeYWnhJ1YqAcNMBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-26T22:13:36.756515Z"},"content_sha256":"10953614bcaed5a826c670e28b58d12548bb758e8d3c1b9b1c806134d470e18e","schema_version":"1.0","event_id":"sha256:10953614bcaed5a826c670e28b58d12548bb758e8d3c1b9b1c806134d470e18e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:VWEJID6KC4K3CO2WPBC2DD6GY6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Soft-Demapping for Short Reach Optical Communication: A Comparison of Deep Neural Networks and Volterra Series","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Georg B\\\"ocherer, Maximilian Schaedler, Stephan Pachnicke","submitted_at":"2025-01-10T14:08:25Z","abstract_excerpt":"In optical fiber communication, optical and electrical components introduce nonlinearities, which require effective compensation to attain highest data rates. In particular, in short reach communication, components are the dominant source of nonlinearities. Volterra series are a popular countermeasure for receiver-side equalization of nonlinear component impairments and their memory effects. However, Volterra equalizer architectures are generally very complex. This article investigates soft deep neural network (DNN) architectures as an alternative for nonlinear equalization and soft-decision d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.05979","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2501.05979/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T09:59:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CrWeQUJ/VaAdGPF7A63GBPM/3os+ExtjtgMxWi6wosuZBbSzay9h7bnjpJKFxQp6QxTPD9X34rKcpsbXp2JnAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-26T22:13:36.756906Z"},"content_sha256":"dd53e37650faa4c03d61256d6e3f79ee1e5cd5f60bc672bc2b7a1bd6a4496084","schema_version":"1.0","event_id":"sha256:dd53e37650faa4c03d61256d6e3f79ee1e5cd5f60bc672bc2b7a1bd6a4496084"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VWEJID6KC4K3CO2WPBC2DD6GY6/bundle.json","state_url":"https://pith.science/pith/VWEJID6KC4K3CO2WPBC2DD6GY6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VWEJID6KC4K3CO2WPBC2DD6GY6/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-26T22:13:36Z","links":{"resolver":"https://pith.science/pith/VWEJID6KC4K3CO2WPBC2DD6GY6","bundle":"https://pith.science/pith/VWEJID6KC4K3CO2WPBC2DD6GY6/bundle.json","state":"https://pith.science/pith/VWEJID6KC4K3CO2WPBC2DD6GY6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VWEJID6KC4K3CO2WPBC2DD6GY6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:VWEJID6KC4K3CO2WPBC2DD6GY6","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"d774081d6c04f7bfd6cede15464465964b3450cab2520a0cb67caed092295647","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SP","submitted_at":"2025-01-10T14:08:25Z","title_canon_sha256":"3203e96c02ee1207287c3877089030bba4a163a02ae947ea88679e7c2bcd5471"},"schema_version":"1.0","source":{"id":"2501.05979","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.05979","created_at":"2026-07-05T09:59:31Z"},{"alias_kind":"arxiv_version","alias_value":"2501.05979v1","created_at":"2026-07-05T09:59:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.05979","created_at":"2026-07-05T09:59:31Z"},{"alias_kind":"pith_short_12","alias_value":"VWEJID6KC4K3","created_at":"2026-07-05T09:59:31Z"},{"alias_kind":"pith_short_16","alias_value":"VWEJID6KC4K3CO2W","created_at":"2026-07-05T09:59:31Z"},{"alias_kind":"pith_short_8","alias_value":"VWEJID6K","created_at":"2026-07-05T09:59:31Z"}],"graph_snapshots":[{"event_id":"sha256:dd53e37650faa4c03d61256d6e3f79ee1e5cd5f60bc672bc2b7a1bd6a4496084","target":"graph","created_at":"2026-07-05T09:59:31Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2501.05979/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In optical fiber communication, optical and electrical components introduce nonlinearities, which require effective compensation to attain highest data rates. In particular, in short reach communication, components are the dominant source of nonlinearities. Volterra series are a popular countermeasure for receiver-side equalization of nonlinear component impairments and their memory effects. However, Volterra equalizer architectures are generally very complex. This article investigates soft deep neural network (DNN) architectures as an alternative for nonlinear equalization and soft-decision d","authors_text":"Georg B\\\"ocherer, Maximilian Schaedler, Stephan Pachnicke","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SP","submitted_at":"2025-01-10T14:08:25Z","title":"Soft-Demapping for Short Reach Optical Communication: A Comparison of Deep Neural Networks and Volterra Series"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.05979","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:10953614bcaed5a826c670e28b58d12548bb758e8d3c1b9b1c806134d470e18e","target":"record","created_at":"2026-07-05T09:59:31Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"d774081d6c04f7bfd6cede15464465964b3450cab2520a0cb67caed092295647","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.SP","submitted_at":"2025-01-10T14:08:25Z","title_canon_sha256":"3203e96c02ee1207287c3877089030bba4a163a02ae947ea88679e7c2bcd5471"},"schema_version":"1.0","source":{"id":"2501.05979","kind":"arxiv","version":1}},"canonical_sha256":"ad88940fca1715b13b567845a18fc6c7b91408d5709662a7b5daa777eb7fc1c6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ad88940fca1715b13b567845a18fc6c7b91408d5709662a7b5daa777eb7fc1c6","first_computed_at":"2026-07-05T09:59:31.043849Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:59:31.043849Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Q3cT7nxnCgszKrSJP6q7GHbQkHWb2BfQTJzVpJDApGZeRstzQNVR5tIHAAQN7hFH+a8qJQ4kD8l6D85JRTTWCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T09:59:31.044274Z","signed_message":"canonical_sha256_bytes"},"source_id":"2501.05979","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:10953614bcaed5a826c670e28b58d12548bb758e8d3c1b9b1c806134d470e18e","sha256:dd53e37650faa4c03d61256d6e3f79ee1e5cd5f60bc672bc2b7a1bd6a4496084"],"state_sha256":"94bbbfc00e006d7196633f01d7ea9ace0b854e206ec6a2abfa6dee7cd0295de2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WLeEh6C8bKo9omhjzGI7sRNVPzKdq9bYjXD7alElkVdfHT/lsavk+Qh4HClwV362cV9ACMtRPGHMXWbu37xKAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-26T22:13:36.759498Z","bundle_sha256":"0e39c2005aff163f69390be918afd19059d624a78233a3fbe8d97f1948619f87"}}