{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:UW5RX7DKUAWJOXWKPMNT2JZ2QF","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":"49fd497dbd0766c615ab158dabcefda5620f742b8cc0f2ec65f45d3209f44484","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-03-29T15:51:38Z","title_canon_sha256":"723a59b0ca911d39a84c2d0b617a756609331fdc481917fb8dbe210e6885c769"},"schema_version":"1.0","source":{"id":"1903.12585","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.12585","created_at":"2026-05-17T23:49:53Z"},{"alias_kind":"arxiv_version","alias_value":"1903.12585v1","created_at":"2026-05-17T23:49:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.12585","created_at":"2026-05-17T23:49:53Z"},{"alias_kind":"pith_short_12","alias_value":"UW5RX7DKUAWJ","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"UW5RX7DKUAWJOXWK","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"UW5RX7DK","created_at":"2026-05-18T12:33:30Z"}],"graph_snapshots":[{"event_id":"sha256:d95476f0cf80063c96347526001ec275aee001f337bf5bbac9fe42cdd50ff0c6","target":"graph","created_at":"2026-05-17T23:49:53Z","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":"Silicon nitride based photonic integrated circuits offer a wavelength operation window in the near infrared down to visible light, which makes them attractive for life science applications. However, they exhibit significantly different behavior in comparison with better-established silicon on insulator counterparts due to the lower index contrast. Among the most important building blocks in photonic integrated circuits are broadband couplers with a defined coupling ratio. We present silicon nitride broadband asymmetric directional coupler designs with 50/50 and 90/10 splitting ratios with a ce","authors_text":"Guenther Koppitsch, Jochen Kraft, Martin Sagmeister, Moritz Eggeling, Paul Muellner, Rainer Hainberger, Stefan Nevlacsil","cross_cats":["physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-03-29T15:51:38Z","title":"Broadband SiN asymmetric directional coupler for 840 nm operation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.12585","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:bb9759f1433d66fbe955ca1a2c7f286112e2196f9f16d9bf8ad0cc466d673963","target":"record","created_at":"2026-05-17T23:49:53Z","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":"49fd497dbd0766c615ab158dabcefda5620f742b8cc0f2ec65f45d3209f44484","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-03-29T15:51:38Z","title_canon_sha256":"723a59b0ca911d39a84c2d0b617a756609331fdc481917fb8dbe210e6885c769"},"schema_version":"1.0","source":{"id":"1903.12585","kind":"arxiv","version":1}},"canonical_sha256":"a5bb1bfc6aa02c975eca7b1b3d273a815cf2cf68234fe8ee14c445695616dddc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a5bb1bfc6aa02c975eca7b1b3d273a815cf2cf68234fe8ee14c445695616dddc","first_computed_at":"2026-05-17T23:49:53.658360Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:49:53.658360Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4LNtINil0FKdGFsbYea6aMRvoyRio6aDfnza/0t6d1Nx7YadGI5mnGwjP4TOrgqYlY40dvNfe3IDWV45fFqABg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:49:53.658753Z","signed_message":"canonical_sha256_bytes"},"source_id":"1903.12585","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bb9759f1433d66fbe955ca1a2c7f286112e2196f9f16d9bf8ad0cc466d673963","sha256:d95476f0cf80063c96347526001ec275aee001f337bf5bbac9fe42cdd50ff0c6"],"state_sha256":"a3969b7472613dc481c5f3c70ea12efbe20e137f7a88350ba4d7a0aa8bb51423"}