{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:VB4HW37XGRPD5ZSZ2XWUU6YHAE","short_pith_number":"pith:VB4HW37X","canonical_record":{"source":{"id":"1407.1671","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-07-07T11:23:19Z","cross_cats_sorted":[],"title_canon_sha256":"4500129191fd2f02f9c2b4f30c6f2cb8750ecb3fd2efe75f4fa39304c6233c59","abstract_canon_sha256":"dc9416641673fa65171a75eb6a864b4a8099183dc1e17d5d4a1d2c142f0bf5ae"},"schema_version":"1.0"},"canonical_sha256":"a8787b6ff7345e3ee659d5ed4a7b0701105cf9be92e79aecc8165a26586ff52b","source":{"kind":"arxiv","id":"1407.1671","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.1671","created_at":"2026-05-18T02:48:10Z"},{"alias_kind":"arxiv_version","alias_value":"1407.1671v1","created_at":"2026-05-18T02:48:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.1671","created_at":"2026-05-18T02:48:10Z"},{"alias_kind":"pith_short_12","alias_value":"VB4HW37XGRPD","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"VB4HW37XGRPD5ZSZ","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"VB4HW37X","created_at":"2026-05-18T12:28:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:VB4HW37XGRPD5ZSZ2XWUU6YHAE","target":"record","payload":{"canonical_record":{"source":{"id":"1407.1671","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-07-07T11:23:19Z","cross_cats_sorted":[],"title_canon_sha256":"4500129191fd2f02f9c2b4f30c6f2cb8750ecb3fd2efe75f4fa39304c6233c59","abstract_canon_sha256":"dc9416641673fa65171a75eb6a864b4a8099183dc1e17d5d4a1d2c142f0bf5ae"},"schema_version":"1.0"},"canonical_sha256":"a8787b6ff7345e3ee659d5ed4a7b0701105cf9be92e79aecc8165a26586ff52b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:48:10.709174Z","signature_b64":"tjRang5xs1tmPoMZ4mfIPb3tmRVnYO5cThslz2/Y67rvLGCoRCcTC2p+wBsgHP47KBb3b+EEsovY9TLSGda1Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a8787b6ff7345e3ee659d5ed4a7b0701105cf9be92e79aecc8165a26586ff52b","last_reissued_at":"2026-05-18T02:48:10.708574Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:48:10.708574Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1407.1671","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":"2026-05-18T02:48:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5iIRMal230OyZlr5BBDJDSmS5LBHqFSC/hRB30zIAeFvZ8HdA6/sRR2GiBYQpPJuXALdmU7Bshu2CnHv9SOoAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T12:08:25.923322Z"},"content_sha256":"dd647156bbc1c16b41b80fe24ce283cebcb8208863cde98a14d6a9f14036ba16","schema_version":"1.0","event_id":"sha256:dd647156bbc1c16b41b80fe24ce283cebcb8208863cde98a14d6a9f14036ba16"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:VB4HW37XGRPD5ZSZ2XWUU6YHAE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Electronic Dispersion Pre-Compensation in PM-QPSK Systems over Mixed-Fiber Links","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"A. Carena, F. Forghieri, G. Bosco, P. Poggiolini, V. Curri, Y. Jiang","submitted_at":"2014-07-07T11:23:19Z","abstract_excerpt":"Dispersion pre-compensation is shown to potentially lead to a substantial non-linearity reduction in PM-QPSK links that use a mixture of high and low dispersion fibers. However, the much larger PAPR of the pre-compensated signal poses challenging requirements on the transmitter."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.1671","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:48:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"926WNciwYJ8GBCU5LN18m+6Ekc4LpjRQAe+oDFvsM/9cYQdF+H/mk9Ip1CBgOJIAveJhrW56Rek5ZWpjlwWSAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T12:08:25.923671Z"},"content_sha256":"21c866f1c0b7c2b18df729e7cbfddf35cced7fa56f7162045322e408ad1431a8","schema_version":"1.0","event_id":"sha256:21c866f1c0b7c2b18df729e7cbfddf35cced7fa56f7162045322e408ad1431a8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VB4HW37XGRPD5ZSZ2XWUU6YHAE/bundle.json","state_url":"https://pith.science/pith/VB4HW37XGRPD5ZSZ2XWUU6YHAE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VB4HW37XGRPD5ZSZ2XWUU6YHAE/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":"2026-05-28T12:08:25Z","links":{"resolver":"https://pith.science/pith/VB4HW37XGRPD5ZSZ2XWUU6YHAE","bundle":"https://pith.science/pith/VB4HW37XGRPD5ZSZ2XWUU6YHAE/bundle.json","state":"https://pith.science/pith/VB4HW37XGRPD5ZSZ2XWUU6YHAE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VB4HW37XGRPD5ZSZ2XWUU6YHAE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:VB4HW37XGRPD5ZSZ2XWUU6YHAE","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":"dc9416641673fa65171a75eb6a864b4a8099183dc1e17d5d4a1d2c142f0bf5ae","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-07-07T11:23:19Z","title_canon_sha256":"4500129191fd2f02f9c2b4f30c6f2cb8750ecb3fd2efe75f4fa39304c6233c59"},"schema_version":"1.0","source":{"id":"1407.1671","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.1671","created_at":"2026-05-18T02:48:10Z"},{"alias_kind":"arxiv_version","alias_value":"1407.1671v1","created_at":"2026-05-18T02:48:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.1671","created_at":"2026-05-18T02:48:10Z"},{"alias_kind":"pith_short_12","alias_value":"VB4HW37XGRPD","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"VB4HW37XGRPD5ZSZ","created_at":"2026-05-18T12:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"VB4HW37X","created_at":"2026-05-18T12:28:52Z"}],"graph_snapshots":[{"event_id":"sha256:21c866f1c0b7c2b18df729e7cbfddf35cced7fa56f7162045322e408ad1431a8","target":"graph","created_at":"2026-05-18T02:48:10Z","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"},"paper":{"abstract_excerpt":"Dispersion pre-compensation is shown to potentially lead to a substantial non-linearity reduction in PM-QPSK links that use a mixture of high and low dispersion fibers. However, the much larger PAPR of the pre-compensated signal poses challenging requirements on the transmitter.","authors_text":"A. Carena, F. Forghieri, G. Bosco, P. Poggiolini, V. Curri, Y. Jiang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-07-07T11:23:19Z","title":"Electronic Dispersion Pre-Compensation in PM-QPSK Systems over Mixed-Fiber Links"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.1671","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:dd647156bbc1c16b41b80fe24ce283cebcb8208863cde98a14d6a9f14036ba16","target":"record","created_at":"2026-05-18T02:48:10Z","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":"dc9416641673fa65171a75eb6a864b4a8099183dc1e17d5d4a1d2c142f0bf5ae","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-07-07T11:23:19Z","title_canon_sha256":"4500129191fd2f02f9c2b4f30c6f2cb8750ecb3fd2efe75f4fa39304c6233c59"},"schema_version":"1.0","source":{"id":"1407.1671","kind":"arxiv","version":1}},"canonical_sha256":"a8787b6ff7345e3ee659d5ed4a7b0701105cf9be92e79aecc8165a26586ff52b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a8787b6ff7345e3ee659d5ed4a7b0701105cf9be92e79aecc8165a26586ff52b","first_computed_at":"2026-05-18T02:48:10.708574Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:48:10.708574Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tjRang5xs1tmPoMZ4mfIPb3tmRVnYO5cThslz2/Y67rvLGCoRCcTC2p+wBsgHP47KBb3b+EEsovY9TLSGda1Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:48:10.709174Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.1671","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dd647156bbc1c16b41b80fe24ce283cebcb8208863cde98a14d6a9f14036ba16","sha256:21c866f1c0b7c2b18df729e7cbfddf35cced7fa56f7162045322e408ad1431a8"],"state_sha256":"4d6b30af9b0d95121236fd423a7d1b77e5d0a56c7d325117cf389c18dd55b822"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DpFuBUK9zIm6T4vwdeuMlwhePzY1Vq9dvbSxWpEWYsgn6LQV323ii6ziFcL0JWuJkV1xStzGVevmOQMBgv3jCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T12:08:25.925541Z","bundle_sha256":"b2d35109f1fb21cfb2a7244b62ae7d08a8f8381086ec9fbac50986d98fdb73d2"}}