{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:NP3FQMDBTGMCADAQ43UWRVFFZV","short_pith_number":"pith:NP3FQMDB","canonical_record":{"source":{"id":"2507.23351","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2025-07-31T08:57:34Z","cross_cats_sorted":[],"title_canon_sha256":"d4c92309eae8353dc5f63fb26964f9dc136d489300267e53dd21eb3b9d21e14a","abstract_canon_sha256":"6d02206d8c7a2f594d39d60d38a70487a985fd5e0c9632d4c060583cb44f2a9f"},"schema_version":"1.0"},"canonical_sha256":"6bf65830619998200c10e6e968d4a5cd5b52d7342d49fa97eb25432b4d3273e4","source":{"kind":"arxiv","id":"2507.23351","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.23351","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"arxiv_version","alias_value":"2507.23351v1","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.23351","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_12","alias_value":"NP3FQMDBTGMC","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_16","alias_value":"NP3FQMDBTGMCADAQ","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_8","alias_value":"NP3FQMDB","created_at":"2026-07-05T11:46:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:NP3FQMDBTGMCADAQ43UWRVFFZV","target":"record","payload":{"canonical_record":{"source":{"id":"2507.23351","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2025-07-31T08:57:34Z","cross_cats_sorted":[],"title_canon_sha256":"d4c92309eae8353dc5f63fb26964f9dc136d489300267e53dd21eb3b9d21e14a","abstract_canon_sha256":"6d02206d8c7a2f594d39d60d38a70487a985fd5e0c9632d4c060583cb44f2a9f"},"schema_version":"1.0"},"canonical_sha256":"6bf65830619998200c10e6e968d4a5cd5b52d7342d49fa97eb25432b4d3273e4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:46:10.671276Z","signature_b64":"5wfzhjnSGQWXgpsIrC9e4nfYiko82WXkDTErir8QK4LN4+CjvBarvbzH9YtJWXx0xKojEoKIR8sW98RvuGzVAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6bf65830619998200c10e6e968d4a5cd5b52d7342d49fa97eb25432b4d3273e4","last_reissued_at":"2026-07-05T11:46:10.670713Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:46:10.670713Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2507.23351","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":"2026-07-05T11:46:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SUrwjV7+hg4X/EEMLSqaNI0sCwU9VZWzLK1ngJjaZKxpjWMmvqMUM03Rohcte75VtsDUG5QkqzuW17fvszhjAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T18:28:11.470734Z"},"content_sha256":"526fbcfb7437452adc4050b37d2cd947ad2ffa08740bf7115cf09fdc9f832893","schema_version":"1.0","event_id":"sha256:526fbcfb7437452adc4050b37d2cd947ad2ffa08740bf7115cf09fdc9f832893"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:NP3FQMDBTGMCADAQ43UWRVFFZV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Asymmetrical Filtering Impairments Mitigation for Digital- Subcarrier-Multiplexing Transmissions Enabled by Multiplication-free K-State Reserved Complex MLSE","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Chengbo Li, Da Hu, Heng Zhang, Hexun Jiang, Lei Shi, Shuai Wei, Weiqin Zhou, Wenjing Yu, Ye Zhao, Yicong Tu, Yongben Wang, Yong Chen, Zhuo Wang","submitted_at":"2025-07-31T08:57:34Z","abstract_excerpt":"We propose a multiplication-free K-state reserved complex maximum-likelihood-sequence-estimation (MLSE) to mitigate asymmetrical filtering impairments in digital-subcarrier-multiplexing transmissions. A required optical-to-noise ratio of 1.63dB over the conventional real MLSE is obtained after transmitting 90 GBaud DSCM DP-16QAM signal over 14 WSSs without multiplications."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.23351","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/2507.23351/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":"2026-07-05T11:46:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vg5/CvKIplRwQTe1rxHOvkIww69HAeUyfVJOzCLsdorwizBp+CcGjQgbbRmUkrB6tiflwtgu+Ek0Z/RXD4zhBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T18:28:11.471269Z"},"content_sha256":"96a90c7e2a773fd4d364d7486991fa9fabbfbd0b92d7bd1c91ebdd2c2760f0c1","schema_version":"1.0","event_id":"sha256:96a90c7e2a773fd4d364d7486991fa9fabbfbd0b92d7bd1c91ebdd2c2760f0c1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NP3FQMDBTGMCADAQ43UWRVFFZV/bundle.json","state_url":"https://pith.science/pith/NP3FQMDBTGMCADAQ43UWRVFFZV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NP3FQMDBTGMCADAQ43UWRVFFZV/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":"2026-08-04T18:28:11Z","links":{"resolver":"https://pith.science/pith/NP3FQMDBTGMCADAQ43UWRVFFZV","bundle":"https://pith.science/pith/NP3FQMDBTGMCADAQ43UWRVFFZV/bundle.json","state":"https://pith.science/pith/NP3FQMDBTGMCADAQ43UWRVFFZV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NP3FQMDBTGMCADAQ43UWRVFFZV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:NP3FQMDBTGMCADAQ43UWRVFFZV","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":"6d02206d8c7a2f594d39d60d38a70487a985fd5e0c9632d4c060583cb44f2a9f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2025-07-31T08:57:34Z","title_canon_sha256":"d4c92309eae8353dc5f63fb26964f9dc136d489300267e53dd21eb3b9d21e14a"},"schema_version":"1.0","source":{"id":"2507.23351","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.23351","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"arxiv_version","alias_value":"2507.23351v1","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.23351","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_12","alias_value":"NP3FQMDBTGMC","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_16","alias_value":"NP3FQMDBTGMCADAQ","created_at":"2026-07-05T11:46:10Z"},{"alias_kind":"pith_short_8","alias_value":"NP3FQMDB","created_at":"2026-07-05T11:46:10Z"}],"graph_snapshots":[{"event_id":"sha256:96a90c7e2a773fd4d364d7486991fa9fabbfbd0b92d7bd1c91ebdd2c2760f0c1","target":"graph","created_at":"2026-07-05T11:46:10Z","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/2507.23351/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We propose a multiplication-free K-state reserved complex maximum-likelihood-sequence-estimation (MLSE) to mitigate asymmetrical filtering impairments in digital-subcarrier-multiplexing transmissions. A required optical-to-noise ratio of 1.63dB over the conventional real MLSE is obtained after transmitting 90 GBaud DSCM DP-16QAM signal over 14 WSSs without multiplications.","authors_text":"Chengbo Li, Da Hu, Heng Zhang, Hexun Jiang, Lei Shi, Shuai Wei, Weiqin Zhou, Wenjing Yu, Ye Zhao, Yicong Tu, Yongben Wang, Yong Chen, Zhuo Wang","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2025-07-31T08:57:34Z","title":"Asymmetrical Filtering Impairments Mitigation for Digital- Subcarrier-Multiplexing Transmissions Enabled by Multiplication-free K-State Reserved Complex MLSE"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.23351","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":"sha256:526fbcfb7437452adc4050b37d2cd947ad2ffa08740bf7115cf09fdc9f832893","target":"record","created_at":"2026-07-05T11:46:10Z","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":"6d02206d8c7a2f594d39d60d38a70487a985fd5e0c9632d4c060583cb44f2a9f","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2025-07-31T08:57:34Z","title_canon_sha256":"d4c92309eae8353dc5f63fb26964f9dc136d489300267e53dd21eb3b9d21e14a"},"schema_version":"1.0","source":{"id":"2507.23351","kind":"arxiv","version":1}},"canonical_sha256":"6bf65830619998200c10e6e968d4a5cd5b52d7342d49fa97eb25432b4d3273e4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6bf65830619998200c10e6e968d4a5cd5b52d7342d49fa97eb25432b4d3273e4","first_computed_at":"2026-07-05T11:46:10.670713Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:46:10.670713Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5wfzhjnSGQWXgpsIrC9e4nfYiko82WXkDTErir8QK4LN4+CjvBarvbzH9YtJWXx0xKojEoKIR8sW98RvuGzVAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T11:46:10.671276Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.23351","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:526fbcfb7437452adc4050b37d2cd947ad2ffa08740bf7115cf09fdc9f832893","sha256:96a90c7e2a773fd4d364d7486991fa9fabbfbd0b92d7bd1c91ebdd2c2760f0c1"],"state_sha256":"8058ad3c7380e1d235aa3739f28166d195d07a5924473d2e449efe6c0c2a920e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Pfr1xgGqui8NbVqp0g08covMjHb+VjFVh6I9PypQcsfhN44KKT4GL6KMVilgkEpVhn5VCwX/+CySVZOqYYveCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T18:28:11.474625Z","bundle_sha256":"6561ffc3e9f1a03cc8a94336a216c2c84ab92c6676c423954b559de21cd25089"}}