{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:SD22JCHJAELBPTDBZDZOLZXPKZ","short_pith_number":"pith:SD22JCHJ","schema_version":"1.0","canonical_sha256":"90f5a488e9011617cc61c8f2e5e6ef565a185b686545b9d38854d87c6703917d","source":{"kind":"arxiv","id":"1711.01888","version":1},"attestation_state":"computed","paper":{"title":"Information capacity of direct detection optical transmission systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT","physics.optics"],"primary_cat":"cs.IT","authors_text":"Antonio Mecozzi, Mark Shtaif","submitted_at":"2017-11-06T13:45:56Z","abstract_excerpt":"We show that the spectral efficiency of a direct detection transmission system is at most 1 bit/s/Hz less than the spectral efficiency of a system employing coherent detection with the same modulation format. Correspondingly, the capacity per complex degree of freedom in systems using direct detection is lower by at most 1 bit."},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1711.01888","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2017-11-06T13:45:56Z","cross_cats_sorted":["math.IT","physics.optics"],"title_canon_sha256":"dd989e1b0d7a5882b0f0074f099ca60eb2f2ca3dab0c66c711ff9e14a36d3725","abstract_canon_sha256":"5919b834b9523163e9395eb5788ad513d2b0ed3f276d47673b2fabc655d3da5b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:21:09.899358Z","signature_b64":"tsVzazkjaVxWGvnCuZXNLPBKhjmxUowC2qfaDVIPtLwqn6jImfI56Redbiuj43E0fXyS81zDUUeiDdSF6tfDAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"90f5a488e9011617cc61c8f2e5e6ef565a185b686545b9d38854d87c6703917d","last_reissued_at":"2026-05-18T00:21:09.898857Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:21:09.898857Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Information capacity of direct detection optical transmission systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT","physics.optics"],"primary_cat":"cs.IT","authors_text":"Antonio Mecozzi, Mark Shtaif","submitted_at":"2017-11-06T13:45:56Z","abstract_excerpt":"We show that the spectral efficiency of a direct detection transmission system is at most 1 bit/s/Hz less than the spectral efficiency of a system employing coherent detection with the same modulation format. Correspondingly, the capacity per complex degree of freedom in systems using direct detection is lower by at most 1 bit."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.01888","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":""},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1711.01888","created_at":"2026-05-18T00:21:09.898930+00:00"},{"alias_kind":"arxiv_version","alias_value":"1711.01888v1","created_at":"2026-05-18T00:21:09.898930+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1711.01888","created_at":"2026-05-18T00:21:09.898930+00:00"},{"alias_kind":"pith_short_12","alias_value":"SD22JCHJAELB","created_at":"2026-05-18T12:31:43.269735+00:00"},{"alias_kind":"pith_short_16","alias_value":"SD22JCHJAELBPTDB","created_at":"2026-05-18T12:31:43.269735+00:00"},{"alias_kind":"pith_short_8","alias_value":"SD22JCHJ","created_at":"2026-05-18T12:31:43.269735+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/SD22JCHJAELBPTDBZDZOLZXPKZ","json":"https://pith.science/pith/SD22JCHJAELBPTDBZDZOLZXPKZ.json","graph_json":"https://pith.science/api/pith-number/SD22JCHJAELBPTDBZDZOLZXPKZ/graph.json","events_json":"https://pith.science/api/pith-number/SD22JCHJAELBPTDBZDZOLZXPKZ/events.json","paper":"https://pith.science/paper/SD22JCHJ"},"agent_actions":{"view_html":"https://pith.science/pith/SD22JCHJAELBPTDBZDZOLZXPKZ","download_json":"https://pith.science/pith/SD22JCHJAELBPTDBZDZOLZXPKZ.json","view_paper":"https://pith.science/paper/SD22JCHJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1711.01888&json=true","fetch_graph":"https://pith.science/api/pith-number/SD22JCHJAELBPTDBZDZOLZXPKZ/graph.json","fetch_events":"https://pith.science/api/pith-number/SD22JCHJAELBPTDBZDZOLZXPKZ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/SD22JCHJAELBPTDBZDZOLZXPKZ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/SD22JCHJAELBPTDBZDZOLZXPKZ/action/storage_attestation","attest_author":"https://pith.science/pith/SD22JCHJAELBPTDBZDZOLZXPKZ/action/author_attestation","sign_citation":"https://pith.science/pith/SD22JCHJAELBPTDBZDZOLZXPKZ/action/citation_signature","submit_replication":"https://pith.science/pith/SD22JCHJAELBPTDBZDZOLZXPKZ/action/replication_record"}},"created_at":"2026-05-18T00:21:09.898930+00:00","updated_at":"2026-05-18T00:21:09.898930+00:00"}