{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:W6FVOF7XLXWTT2DCTRUYXCUF3V","short_pith_number":"pith:W6FVOF7X","canonical_record":{"source":{"id":"1805.02706","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-04-30T10:43:26Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"705194d0639357117b7814863cc537277c337cb380e21119b410b755c7ffbe19","abstract_canon_sha256":"dcadf7462347ca78bdb2f009b32eb8b25fd16f209f68da8ac650903cabf18dd9"},"schema_version":"1.0"},"canonical_sha256":"b78b5717f75ded39e8629c698b8a85dd7e87d20a352ca0313cef4a72024be052","source":{"kind":"arxiv","id":"1805.02706","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.02706","created_at":"2026-05-18T00:16:35Z"},{"alias_kind":"arxiv_version","alias_value":"1805.02706v1","created_at":"2026-05-18T00:16:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.02706","created_at":"2026-05-18T00:16:35Z"},{"alias_kind":"pith_short_12","alias_value":"W6FVOF7XLXWT","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"W6FVOF7XLXWTT2DC","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"W6FVOF7X","created_at":"2026-05-18T12:32:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:W6FVOF7XLXWTT2DCTRUYXCUF3V","target":"record","payload":{"canonical_record":{"source":{"id":"1805.02706","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-04-30T10:43:26Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"705194d0639357117b7814863cc537277c337cb380e21119b410b755c7ffbe19","abstract_canon_sha256":"dcadf7462347ca78bdb2f009b32eb8b25fd16f209f68da8ac650903cabf18dd9"},"schema_version":"1.0"},"canonical_sha256":"b78b5717f75ded39e8629c698b8a85dd7e87d20a352ca0313cef4a72024be052","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:16:35.987875Z","signature_b64":"xCcZfpQwS0M//RXFaOXBh8S1yDKZN5FXF6kfRSpD5uWI+I/fDcHuKgebtKGgNiN4lhYWHYCWHTjIqY08J1CVCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b78b5717f75ded39e8629c698b8a85dd7e87d20a352ca0313cef4a72024be052","last_reissued_at":"2026-05-18T00:16:35.987366Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:16:35.987366Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.02706","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":"2026-05-18T00:16:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4vw9Uiq3Hzf6A340hQa+rd/icQNqsgo+Djzgid70W3lCWvaXkHYBMhy5oBnavlqfkhVdgHGmkbzibv/lm0ppDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T22:37:00.027298Z"},"content_sha256":"7b33a64e10a90b94fb772772e749f22fbfde5d033db8d63af03325dc128472f2","schema_version":"1.0","event_id":"sha256:7b33a64e10a90b94fb772772e749f22fbfde5d033db8d63af03325dc128472f2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:W6FVOF7XLXWTT2DCTRUYXCUF3V","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Generation of tunable, high repetition rate optical frequency combs using on-chip silicon modulators","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"physics.app-ph","authors_text":"Kp Nagarjun, Shankar Kumar Selvaraja, Vadivukarassi Jeyaselvan, V R Supradeepa","submitted_at":"2018-04-30T10:43:26Z","abstract_excerpt":"We experimentally demonstrate tunable, highly-stable frequency combs with high repetition-rates using a single, charge injection based silicon PN modulator. In this work, we demonstrate combs in the C-band with over 8 lines in a 20-dB bandwidth. We demonstrate continuous tuning of the center frequency in the C-band and tuning of the repetition-rate from 7.5GHz to 12.5GHz. We also demonstrate through simulations the potential for bandwidth scaling using an optimized silicon PIN modulator. We find that, the time varying free carrier absorption due to carrier injection, an undesirable effect in d"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.02706","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":"2026-05-18T00:16:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vY5UlyENH/7H93X4ODCdhpic5WkR7izM7mswx7o5GtmG4lgIzjltxYsJICUZ6U0f8n8ylT5CRsuRsHyTjfIeAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T22:37:00.027661Z"},"content_sha256":"85b02f2218e896c68ef5cfd8a39bdd03965c9bc58c60b338ae9b9d0ca49b749d","schema_version":"1.0","event_id":"sha256:85b02f2218e896c68ef5cfd8a39bdd03965c9bc58c60b338ae9b9d0ca49b749d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W6FVOF7XLXWTT2DCTRUYXCUF3V/bundle.json","state_url":"https://pith.science/pith/W6FVOF7XLXWTT2DCTRUYXCUF3V/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W6FVOF7XLXWTT2DCTRUYXCUF3V/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":"2026-06-01T22:37:00Z","links":{"resolver":"https://pith.science/pith/W6FVOF7XLXWTT2DCTRUYXCUF3V","bundle":"https://pith.science/pith/W6FVOF7XLXWTT2DCTRUYXCUF3V/bundle.json","state":"https://pith.science/pith/W6FVOF7XLXWTT2DCTRUYXCUF3V/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W6FVOF7XLXWTT2DCTRUYXCUF3V/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:W6FVOF7XLXWTT2DCTRUYXCUF3V","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":"dcadf7462347ca78bdb2f009b32eb8b25fd16f209f68da8ac650903cabf18dd9","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-04-30T10:43:26Z","title_canon_sha256":"705194d0639357117b7814863cc537277c337cb380e21119b410b755c7ffbe19"},"schema_version":"1.0","source":{"id":"1805.02706","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.02706","created_at":"2026-05-18T00:16:35Z"},{"alias_kind":"arxiv_version","alias_value":"1805.02706v1","created_at":"2026-05-18T00:16:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.02706","created_at":"2026-05-18T00:16:35Z"},{"alias_kind":"pith_short_12","alias_value":"W6FVOF7XLXWT","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"W6FVOF7XLXWTT2DC","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"W6FVOF7X","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:85b02f2218e896c68ef5cfd8a39bdd03965c9bc58c60b338ae9b9d0ca49b749d","target":"graph","created_at":"2026-05-18T00:16:35Z","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":"We experimentally demonstrate tunable, highly-stable frequency combs with high repetition-rates using a single, charge injection based silicon PN modulator. In this work, we demonstrate combs in the C-band with over 8 lines in a 20-dB bandwidth. We demonstrate continuous tuning of the center frequency in the C-band and tuning of the repetition-rate from 7.5GHz to 12.5GHz. We also demonstrate through simulations the potential for bandwidth scaling using an optimized silicon PIN modulator. We find that, the time varying free carrier absorption due to carrier injection, an undesirable effect in d","authors_text":"Kp Nagarjun, Shankar Kumar Selvaraja, Vadivukarassi Jeyaselvan, V R Supradeepa","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-04-30T10:43:26Z","title":"Generation of tunable, high repetition rate optical frequency combs using on-chip silicon modulators"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.02706","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":"sha256:7b33a64e10a90b94fb772772e749f22fbfde5d033db8d63af03325dc128472f2","target":"record","created_at":"2026-05-18T00:16:35Z","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":"dcadf7462347ca78bdb2f009b32eb8b25fd16f209f68da8ac650903cabf18dd9","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-04-30T10:43:26Z","title_canon_sha256":"705194d0639357117b7814863cc537277c337cb380e21119b410b755c7ffbe19"},"schema_version":"1.0","source":{"id":"1805.02706","kind":"arxiv","version":1}},"canonical_sha256":"b78b5717f75ded39e8629c698b8a85dd7e87d20a352ca0313cef4a72024be052","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b78b5717f75ded39e8629c698b8a85dd7e87d20a352ca0313cef4a72024be052","first_computed_at":"2026-05-18T00:16:35.987366Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:16:35.987366Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xCcZfpQwS0M//RXFaOXBh8S1yDKZN5FXF6kfRSpD5uWI+I/fDcHuKgebtKGgNiN4lhYWHYCWHTjIqY08J1CVCg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:16:35.987875Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.02706","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7b33a64e10a90b94fb772772e749f22fbfde5d033db8d63af03325dc128472f2","sha256:85b02f2218e896c68ef5cfd8a39bdd03965c9bc58c60b338ae9b9d0ca49b749d"],"state_sha256":"14bdac58dd9dba6538dcc0cde37e7ac1b61521ea99ac624ee18293ecd1878140"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"suqOvHCfuKvvrKSq8oOcTHh5/NpAZBFUpixH+tjtStzVluby5aQTAcD2i8nCX1q8YLW0hpyodFmCfXyhoDv2Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T22:37:00.030117Z","bundle_sha256":"d761691bdb2d1582fbccb04961c66bdcd225d3c1bb9786d8f976061f59e30973"}}