{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:5GNC4ILLB2D2KAEPAZGNSEZVF5","short_pith_number":"pith:5GNC4ILL","canonical_record":{"source":{"id":"2009.10570","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-09-22T14:21:05Z","cross_cats_sorted":[],"title_canon_sha256":"6ab5b7d1e58fc9041595241297a8edda78a9b4e9b8ea3873d4561a80b9685bae","abstract_canon_sha256":"befb231f20fe6ebe53bdfe58c30f547c8645b4f1779ff0825ac6f17df6ecc9db"},"schema_version":"1.0"},"canonical_sha256":"e99a2e216b0e87a5008f064cd913352f7a4d3d0c1d059807f3d1cf85f821b930","source":{"kind":"arxiv","id":"2009.10570","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.10570","created_at":"2026-07-05T01:37:20Z"},{"alias_kind":"arxiv_version","alias_value":"2009.10570v1","created_at":"2026-07-05T01:37:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.10570","created_at":"2026-07-05T01:37:20Z"},{"alias_kind":"pith_short_12","alias_value":"5GNC4ILLB2D2","created_at":"2026-07-05T01:37:20Z"},{"alias_kind":"pith_short_16","alias_value":"5GNC4ILLB2D2KAEP","created_at":"2026-07-05T01:37:20Z"},{"alias_kind":"pith_short_8","alias_value":"5GNC4ILL","created_at":"2026-07-05T01:37:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:5GNC4ILLB2D2KAEPAZGNSEZVF5","target":"record","payload":{"canonical_record":{"source":{"id":"2009.10570","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-09-22T14:21:05Z","cross_cats_sorted":[],"title_canon_sha256":"6ab5b7d1e58fc9041595241297a8edda78a9b4e9b8ea3873d4561a80b9685bae","abstract_canon_sha256":"befb231f20fe6ebe53bdfe58c30f547c8645b4f1779ff0825ac6f17df6ecc9db"},"schema_version":"1.0"},"canonical_sha256":"e99a2e216b0e87a5008f064cd913352f7a4d3d0c1d059807f3d1cf85f821b930","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:37:20.522156Z","signature_b64":"+ylNtXRKJ6l8VdDU5ZJZT5i6ZubHzq04UyY4+4/ECguftUW5+hHpRdZRug5R9SZ9/ww7JNTlzTv4JNKsuG7ACg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e99a2e216b0e87a5008f064cd913352f7a4d3d0c1d059807f3d1cf85f821b930","last_reissued_at":"2026-07-05T01:37:20.521692Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:37:20.521692Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2009.10570","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":"2026-07-05T01:37:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ce5ySyBgvKuvpk6a89qK6WWlCC6xvZB+YA8QYQdzD4TbLCISeG2J5v2ykW+T/x6s++JHX419wdvW2QCDcRsvAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T07:17:58.734089Z"},"content_sha256":"a885fad0ab15f75f0ccc4d172f692f62027c6c9583cf7b063719cffab717d3ac","schema_version":"1.0","event_id":"sha256:a885fad0ab15f75f0ccc4d172f692f62027c6c9583cf7b063719cffab717d3ac"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:5GNC4ILLB2D2KAEPAZGNSEZVF5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Solutions for 80 km DWDM Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Annika Dochhan, Helmut Griesser, J\\\"org-Peter Elbers, Michael Eiselt","submitted_at":"2020-09-22T14:21:05Z","abstract_excerpt":"We review currently discussed solutions for 80 km DWDM transmission targeting inter data-center connections at 100G and 400G line rates. PDM-64QAM, PAM4 and DMT are investigated, while the focus lies on directly detected solutions."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.10570","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/2009.10570/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":"2026-07-05T01:37:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NH+xzUdrE+s6/qZjFIvIo/0I9irWTUWvL57zoO9AoX/YUflcBKNidLbiBLAHyUsRvMsxSdfkucqF+y53bDgvBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T07:17:58.734484Z"},"content_sha256":"13b108a9f7c6fb2add5a12ae0936ff0026764a300aa6d9eb9d3a9d52bccf13cd","schema_version":"1.0","event_id":"sha256:13b108a9f7c6fb2add5a12ae0936ff0026764a300aa6d9eb9d3a9d52bccf13cd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5GNC4ILLB2D2KAEPAZGNSEZVF5/bundle.json","state_url":"https://pith.science/pith/5GNC4ILLB2D2KAEPAZGNSEZVF5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5GNC4ILLB2D2KAEPAZGNSEZVF5/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":"2026-07-08T07:17:58Z","links":{"resolver":"https://pith.science/pith/5GNC4ILLB2D2KAEPAZGNSEZVF5","bundle":"https://pith.science/pith/5GNC4ILLB2D2KAEPAZGNSEZVF5/bundle.json","state":"https://pith.science/pith/5GNC4ILLB2D2KAEPAZGNSEZVF5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5GNC4ILLB2D2KAEPAZGNSEZVF5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:5GNC4ILLB2D2KAEPAZGNSEZVF5","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":"befb231f20fe6ebe53bdfe58c30f547c8645b4f1779ff0825ac6f17df6ecc9db","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-09-22T14:21:05Z","title_canon_sha256":"6ab5b7d1e58fc9041595241297a8edda78a9b4e9b8ea3873d4561a80b9685bae"},"schema_version":"1.0","source":{"id":"2009.10570","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.10570","created_at":"2026-07-05T01:37:20Z"},{"alias_kind":"arxiv_version","alias_value":"2009.10570v1","created_at":"2026-07-05T01:37:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.10570","created_at":"2026-07-05T01:37:20Z"},{"alias_kind":"pith_short_12","alias_value":"5GNC4ILLB2D2","created_at":"2026-07-05T01:37:20Z"},{"alias_kind":"pith_short_16","alias_value":"5GNC4ILLB2D2KAEP","created_at":"2026-07-05T01:37:20Z"},{"alias_kind":"pith_short_8","alias_value":"5GNC4ILL","created_at":"2026-07-05T01:37:20Z"}],"graph_snapshots":[{"event_id":"sha256:13b108a9f7c6fb2add5a12ae0936ff0026764a300aa6d9eb9d3a9d52bccf13cd","target":"graph","created_at":"2026-07-05T01:37:20Z","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/2009.10570/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We review currently discussed solutions for 80 km DWDM transmission targeting inter data-center connections at 100G and 400G line rates. PDM-64QAM, PAM4 and DMT are investigated, while the focus lies on directly detected solutions.","authors_text":"Annika Dochhan, Helmut Griesser, J\\\"org-Peter Elbers, Michael Eiselt","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-09-22T14:21:05Z","title":"Solutions for 80 km DWDM Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.10570","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:a885fad0ab15f75f0ccc4d172f692f62027c6c9583cf7b063719cffab717d3ac","target":"record","created_at":"2026-07-05T01:37:20Z","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":"befb231f20fe6ebe53bdfe58c30f547c8645b4f1779ff0825ac6f17df6ecc9db","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SP","submitted_at":"2020-09-22T14:21:05Z","title_canon_sha256":"6ab5b7d1e58fc9041595241297a8edda78a9b4e9b8ea3873d4561a80b9685bae"},"schema_version":"1.0","source":{"id":"2009.10570","kind":"arxiv","version":1}},"canonical_sha256":"e99a2e216b0e87a5008f064cd913352f7a4d3d0c1d059807f3d1cf85f821b930","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e99a2e216b0e87a5008f064cd913352f7a4d3d0c1d059807f3d1cf85f821b930","first_computed_at":"2026-07-05T01:37:20.521692Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:37:20.521692Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+ylNtXRKJ6l8VdDU5ZJZT5i6ZubHzq04UyY4+4/ECguftUW5+hHpRdZRug5R9SZ9/ww7JNTlzTv4JNKsuG7ACg==","signature_status":"signed_v1","signed_at":"2026-07-05T01:37:20.522156Z","signed_message":"canonical_sha256_bytes"},"source_id":"2009.10570","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a885fad0ab15f75f0ccc4d172f692f62027c6c9583cf7b063719cffab717d3ac","sha256:13b108a9f7c6fb2add5a12ae0936ff0026764a300aa6d9eb9d3a9d52bccf13cd"],"state_sha256":"8a9b6f401004a00a60d39e25e911c639d02bebfb1230dc37fc9c847fb6f58082"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9aiUVu4cEYVnHArL6gyR+4PZ+gTI27GQM/++djNGh6YNVXadG5jd5CcGamDrDm/N1mbScbxehZGZDuI9/2UiAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-08T07:17:58.737736Z","bundle_sha256":"585bb2318ec5245cab315726da1df18f9d8f2129ff2fe8703b3c22a5273249b6"}}