{"id":9415,"date":"2026-10-28T15:51:01","date_gmt":"2026-10-28T15:51:01","guid":{"rendered":"https:\/\/www.westernoptronics.com\/?p=9415"},"modified":"2026-10-28T15:51:01","modified_gmt":"2026-10-28T15:51:01","slug":"elsfp-interface-qualification-fiber-mapping-polarization","status":"publish","type":"post","link":"https:\/\/www.westernoptronics.com\/ar\/elsfp-interface-qualification-fiber-mapping-polarization\/","title":{"rendered":"ELSFP Interface Qualification: Fiber Mapping, Polarization and Host Checks"},"content":{"rendered":"<article id=\"we-interface-note\">\n<style>\n#we-interface-note{--ink:#17343d;--teal:#08726a;--mint:#9bdfcc;max-width:1020px;margin:0 auto;color:#30464d;font:18px\/1.8 \"Trebuchet MS\",Verdana,sans-serif}#we-interface-note *{box-sizing:border-box}#we-interface-note .reading{max-width:780px;margin:0 auto}#we-interface-note .eyebrow{font-size:13px;letter-spacing:.12em;color:var(--teal);font-weight:bold;text-transform:uppercase}#we-interface-note .lead{font-size:23px;line-height:1.55;color:var(--ink)}#we-interface-note h2{font-size:30px;line-height:1.3;color:var(--ink);margin:2em 0 .65em}#we-interface-note h3{font-size:22px;line-height:1.4;color:var(--ink)}#we-interface-note a{color:var(--teal);text-decoration:underline;text-underline-offset:3px}#we-interface-note figure{margin:34px 0}#we-interface-note svg{display:block;width:100%;height:auto}#we-interface-note figcaption{max-width:780px;margin:12px auto;color:#52676f;font-size:15px;line-height:1.6}#we-interface-note .callout{padding:18px 22px;border-left:4px solid var(--teal);background:#f2f7f5}#we-interface-note li{margin:.6em 0}#we-interface-note .sources{font-size:15px;line-height:1.7}#we-interface-note .closing{border-top:2px solid var(--teal);padding-top:20px;margin-top:36px}#we-interface-note .map-mobile{display:none}#we-interface-note .evidence-flow{background:#f2f7f5;border:1px solid #d3e3df;padding:24px}#we-interface-note .evidence-flow .flow-title{font-size:23px;font-weight:bold;color:var(--ink);margin:0 0 18px}#we-interface-note .flow-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}#we-interface-note .flow-step{background:white;border-top:3px solid var(--teal);padding:20px;min-width:0}#we-interface-note .flow-step .step-no{font-size:13px;letter-spacing:.08em;color:var(--teal);font-weight:bold}#we-interface-note .flow-step h3{margin:7px 0;font-size:21px}#we-interface-note .flow-step p{margin:0;font-size:16px;line-height:1.6}#we-interface-note .release-line{margin:20px 0 0;color:var(--ink);font-size:17px;font-weight:bold}#we-interface-note .record{border:1px solid #d3e3df;border-radius:4px;padding:18px 22px;background:#fbfcfc}#we-interface-note .record p{margin:.5em 0}#we-interface-note .mono{font-family:Consolas,monospace;font-size:.9em;overflow-wrap:anywhere}@media(max-width:600px){#we-interface-note{font-size:17px}#we-interface-note .lead{font-size:20px}#we-interface-note h2{font-size:26px}#we-interface-note .map-desktop{display:none}#we-interface-note .map-mobile{display:block}#we-interface-note .flow-grid{grid-template-columns:1fr}#we-interface-note .evidence-flow{padding:18px}#we-interface-note .flow-step{padding:16px}#we-interface-note .record,#we-interface-note .callout{padding:15px}#we-interface-note figure{margin:26px 0}}\n<\/style>\n<div class=\"reading\">\n<p class=\"eyebrow\">WE \/ Western Optronics \u2022 Optical engineering<\/p>\n<p class=\"lead\">An ELSFP can fit the cage and deliver the expected optical power while the integration still needs a more basic answer: which light reaches which engine input, with which polarization reference?<\/p>\n<p>For teams building CPO systems, a useful interface review connects three records: the optical drawing, the harness build record and the host\u2019s resource map. This engineering note proposes a practical way to make those records agree before design release.<\/p>\n<p>Our earlier articles cover <a href=\"https:\/\/www.westernoptronics.com\/ar\/what-does-elsfp-do-in-cpo-system\/\">the ELSFP\u2019s architectural role<\/a> and <a href=\"https:\/\/www.westernoptronics.com\/ar\/elsfp-optical-engine-power-budget\/\">the CW power budget<\/a>. Here, the focus is identity and acceptance evidence, not a new power calculation.<\/p>\n<\/div>\n<figure>\n<svg class=\"map-desktop\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 920 510\" role=\"img\" aria-labelledby=\"we-map-title we-map-desc\">\n<title id=\"we-map-title\">Follow the identity of each CW feed<\/title><desc id=\"we-map-desc\">Illustrative logical map, not an OIF pinout. Source S-A follows harness route H7 to OE-2 input B; S-B follows H8 to OE-1 input A; S-C follows H9 to OE-1 input C. The host resource map should record the same three relationships. Aliases are invented.<\/desc>\n<rect width=\"920\" height=\"510\" rx=\"12\" fill=\"#17343d\"\/>\n<g font-family=\"Verdana,sans-serif\"><text x=\"40\" y=\"45\" fill=\"#9bdfcc\" font-size=\"15\">WE \/ WESTERN OPTRONICS<\/text><text x=\"40\" y=\"91\" fill=\"white\" font-size=\"29\">Follow the light. Preserve its identity.<\/text><text x=\"40\" y=\"123\" fill=\"#d4e3e5\" font-size=\"16\">Illustrative logical map \u2022 Invented aliases \u2022 Not a connector pinout<\/text>\n<g fill=\"#d4e3e5\" font-size=\"15\"><text x=\"40\" y=\"173\">SOURCE ALIAS<\/text><text x=\"347\" y=\"173\">HARNESS ROUTE<\/text><text x=\"665\" y=\"173\">ENGINE INPUT<\/text><\/g>\n<g fill=\"#284a53\"><rect x=\"40\" y=\"195\" width=\"200\" height=\"54\" rx=\"5\"\/><rect x=\"40\" y=\"274\" width=\"200\" height=\"54\" rx=\"5\"\/><rect x=\"40\" y=\"353\" width=\"200\" height=\"54\" rx=\"5\"\/><rect x=\"665\" y=\"195\" width=\"215\" height=\"54\" rx=\"5\"\/><rect x=\"665\" y=\"274\" width=\"215\" height=\"54\" rx=\"5\"\/><rect x=\"665\" y=\"353\" width=\"215\" height=\"54\" rx=\"5\"\/><\/g>\n<g stroke-width=\"3\" fill=\"none\"><path d=\"M240 222 H340 M460 222 H640\" stroke=\"#9bdfcc\"\/><path d=\"M240 301 H340 M460 301 H640\" stroke=\"#e9bd79\"\/><path d=\"M240 380 H340 M460 380 H640\" stroke=\"#a9cbe6\"\/><\/g>\n<path d=\"M640 215 L653 222 L640 229\" fill=\"#9bdfcc\"\/><path d=\"M640 294 L653 301 L640 308\" fill=\"#e9bd79\"\/><path d=\"M640 373 L653 380 L640 387\" fill=\"#a9cbe6\"\/>\n<g font-size=\"21\" fill=\"white\"><text x=\"64\" y=\"230\">S-A<\/text><text x=\"64\" y=\"309\">S-B<\/text><text x=\"64\" y=\"388\">S-C<\/text><text x=\"369\" y=\"230\">H7<\/text><text x=\"369\" y=\"309\">H8<\/text><text x=\"369\" y=\"388\">H9<\/text><text x=\"684\" y=\"230\">OE-2 \/ input B<\/text><text x=\"684\" y=\"309\">OE-1 \/ input A<\/text><text x=\"684\" y=\"388\">OE-1 \/ input C<\/text><\/g>\n<rect x=\"40\" y=\"441\" width=\"840\" height=\"42\" rx=\"4\" fill=\"#08726a\"\/><text x=\"62\" y=\"468\" fill=\"white\" font-size=\"16\">HOST RESOURCE MAP = the same source \u2192 route \u2192 destination relationships<\/text><\/g>\n<\/svg>\n<svg class=\"map-mobile\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 380 555\" role=\"img\" aria-labelledby=\"we-map-m-title we-map-m-desc\">\n<title id=\"we-map-m-title\">Three illustrative CW feed identities<\/title><desc id=\"we-map-m-desc\">Source S-A via H7 reaches OE-2 input B. Source S-B via H8 reaches OE-1 input A. Source S-C via H9 reaches OE-1 input C. These invented aliases are a logical map, not a connector pinout; the host map should match.<\/desc>\n<rect width=\"380\" height=\"555\" rx=\"10\" fill=\"#17343d\"\/><g font-family=\"Verdana,sans-serif\"><text x=\"24\" y=\"36\" fill=\"#9bdfcc\" font-size=\"13\">WE \/ WESTERN OPTRONICS<\/text><text x=\"24\" y=\"76\" fill=\"white\" font-size=\"25\">Follow each CW feed.<\/text><text x=\"24\" y=\"105\" fill=\"#d4e3e5\" font-size=\"14\">Illustrative map, not a connector pinout<\/text>\n<g fill=\"#284a53\"><rect x=\"24\" y=\"132\" width=\"332\" height=\"100\" rx=\"5\"\/><rect x=\"24\" y=\"247\" width=\"332\" height=\"100\" rx=\"5\"\/><rect x=\"24\" y=\"362\" width=\"332\" height=\"100\" rx=\"5\"\/><\/g>\n<g font-size=\"16\"><text x=\"42\" y=\"162\" fill=\"#9bdfcc\">Source S-A \u2192 harness H7<\/text><text x=\"42\" y=\"277\" fill=\"#e9bd79\">Source S-B \u2192 harness H8<\/text><text x=\"42\" y=\"392\" fill=\"#a9cbe6\">Source S-C \u2192 harness H9<\/text><\/g><g font-size=\"22\" fill=\"white\"><text x=\"42\" y=\"204\">OE-2 \/ input B<\/text><text x=\"42\" y=\"319\">OE-1 \/ input A<\/text><text x=\"42\" y=\"434\">OE-1 \/ input C<\/text><\/g><text x=\"24\" y=\"498\" fill=\"#9bdfcc\" font-size=\"16\">Host map: preserve every relationship.<\/text><text x=\"24\" y=\"528\" fill=\"#d4e3e5\" font-size=\"13\">All aliases are invented for this example.<\/text><\/g>\n<\/svg>\n<figcaption>Figure 1. Original WE logical illustration. It deliberately avoids physical ferrule positions: an assembly drawing must supply the actual positions, viewing direction and application-specific assignments. Text equivalent: S-A \u2192 H7 \u2192 OE-2\/B; S-B \u2192 H8 \u2192 OE-1\/A; S-C \u2192 H9 \u2192 OE-1\/C.<\/figcaption>\n<\/figure>\n<div class=\"reading\">\n<h2>1. Freeze the drawing\u2019s point of view<\/h2>\n<p>Start the interface record with a drawing revision and an explicit viewing direction. Label the module-side view and host-side view separately. Avoid a diagram that silently switches between looking into a connector and looking along a cable.<\/p>\n<p><a href=\"https:\/\/www.oiforum.com\/wp-content\/uploads\/OIF-ELSFP-02.0.pdf\">OIF-ELSFP-02.0<\/a> defines fiber naming, polarization orientation and DR\/FR wavelength assignments for the specified MT-12 configurations. Use its Figure 36 and Table 5 when they apply; other assignments require the applicable ELSFP CMIS definition. [1, \u00a73.4]<\/p>\n<p>Then create one traceable entry per used feed. Include the source identifier, physical fiber position, wavelength requirement, harness route and destination input. Keep the engineering alias separate from the standard\u2019s position name. An alias such as \u201cS-A\u201d helps a team discuss a path; it cannot replace a controlled pin-and-fiber drawing.<\/p>\n<p>For unused positions, record the intended disposition rather than leaving an empty cell. Ask the assembly supplier to confirm it against the selected interface specification. This turns \u201cnot connected\u201d into a reviewed design decision instead of an assumption made during build.<\/p>\n<h2>2. Separate mechanical fit from application acceptance<\/h2>\n<p>The OIF agreement explicitly notes that hard keying does not stop an 8PMF module from mating with a 4PMF port. The host must compare advertised CMIS capabilities with system needs and assign the required laser fibers. [1, \u00a73.4.1]<\/p>\n<p>For an integration review, create two sign-off lines: <strong>mechanical mating confirmed<\/strong> and <strong>application compatibility confirmed<\/strong>. A completed first line must not automatically complete the second. Record which module and firmware revisions were checked, and retain the capability readout used in the decision.<\/p>\n<p>A useful review question is: \u201cIf a mechanically compatible replacement with different capabilities arrives, what evidence causes the host to accept or reject it?\u201d Define that decision in the qualification plan before relying on a successful first installation.<\/p>\n<h2>3. Make the polarization reference measurable<\/h2>\n<p>OIF specifies an application-dependent polarization extinction ratio (PER), referenced to the line joining the module ferrule\u2019s guide-hole centers. Its TPL2 measurement definition includes a characterized test patch cord. A PER value therefore needs a reference orientation and a known test setup. [1, \u00a7\u00a73.4.1, 3.6.1]<\/p>\n<p>Request a polarization evidence sheet with five fields: the applicable requirement, the reference axis, the measurement plane, the fixture identification and the stated test conditions. Ask how the supplier accounts for the fixture\u2019s influence and measurement uncertainty. Do not turn an unqualified typical number into a guaranteed acceptance limit.<\/p>\n<p>Also separate the module qualification from the installed-path qualification. If the purchasing decision depends on the condition at the engine input, ask for evidence at that boundary or a justified correlation to it. A module-only report should be labeled as such.<\/p>\n<h2>4. Reconcile the optical map with the host map<\/h2>\n<p>OIF\u2019s <a href=\"https:\/\/www.oiforum.com\/wp-content\/uploads\/OIF-MGT-Co-Packaging-ELSFP-01.0.pdf\">management white paper<\/a> places the ELS-to-OE relationship map in the host controller. It describes provisioned maps and possible verification or discovery methods; automatic discovery is not a universal assumption. The white paper is informative, not a replacement for the applicable specifications. [2, \u00a7\u00a72, 5]<\/p>\n<p>Use Figure 1 as a documentation exercise. If the harness record says S-A reaches OE-2\/B but the host record says OE-1\/A, the review has found a conflict even before discussing optical performance. Give the discrepancy an owner and reconcile both records against observed connectivity.<\/p>\n<p>Keep evidence granular: one result per relevant feed, with fixture and assembly identifiers. \u201cLight present\u201d is a weaker record than \u201cthe identified source reaches the intended destination.\u201d Any energized verification belongs under the system supplier\u2019s approved procedures and laser-safety controls; this article is not a turn-on or connector-inspection procedure.<\/p>\n<\/div>\n<figure class=\"evidence-flow\">\n<p class=\"flow-title\">Four evidence gates before interface release<\/p>\n<div class=\"flow-grid\">\n<section class=\"flow-step\"><span class=\"step-no\">01 \/ DEFINE<\/span><h3>Controlled interface<\/h3><p>Drawing revision, view direction, physical positions and intended destinations.<\/p><\/section>\n<section class=\"flow-step\"><span class=\"step-no\">02 \/ COMPARE<\/span><h3>Module + host<\/h3><p>Mechanical fit and application capability checks, recorded separately.<\/p><\/section>\n<section class=\"flow-step\"><span class=\"step-no\">03 \/ MEASURE<\/span><h3>Optical evidence<\/h3><p>Connectivity and polarization results, with named boundaries and fixtures.<\/p><\/section>\n<section class=\"flow-step\"><span class=\"step-no\">04 \/ RECONCILE<\/span><h3>Release record<\/h3><p>Drawing, harness and host map agree; unresolved exceptions stay visible.<\/p><\/section>\n<\/div>\n<p class=\"release-line\">Release decision \u2192 evidence reviewed + exceptions resolved or formally dispositioned<\/p>\n<figcaption>Figure 2. Original WE qualification workflow, offered as an engineering review aid. These are proposed documentation gates, not OIF conformance tests or a statement that a particular product has passed.<\/figcaption>\n<\/figure>\n<div class=\"reading\">\n<h2>5. Ask for a compact, reusable evidence package<\/h2>\n<p>For a supplier review or internal design handoff, collect the following in one revision-controlled package:<\/p>\n<ol>\n<li><strong>Interface definition:<\/strong> the selected specification revisions, module and host connector drawings, and a feed-by-feed assignment list.<\/li>\n<li><strong>Assembly traceability:<\/strong> harness part and revision, endpoint labels, source and engine identifiers, and the build under evaluation.<\/li>\n<li><strong>Acceptance evidence:<\/strong> connectivity results, applicable polarization requirements and measurements, the separate power-budget report, and test conditions.<\/li>\n<li><strong>Host evidence:<\/strong> capability records, the installed resource map and the firmware revision used for the compatibility decision.<\/li>\n<li><strong>Change control:<\/strong> an owner for each exception and an explicit decision on what must be rechecked after a module, harness or firmware change.<\/li>\n<\/ol>\n<div class=\"record\"><strong>Suggested record key<\/strong><p class=\"mono\">Assembly revision \/ source ID \/ physical position \/ route ID \/ engine input \/ requirement revision \/ evidence ID<\/p><p>This is a proposed traceability format. Add fields required by your quality process; do not substitute it for a supplier\u2019s controlled interface specification.<\/p><\/div>\n<div class=\"closing\"><h2>The engineering takeaway<\/h2><p>Close the identity chain as carefully as the power budget. A useful ELSFP integration record tells the next engineer what connects where, how polarization was evaluated and why the host accepted the configuration. That makes a later replacement or revision a reviewable engineering change rather than a reconstruction of the original team\u2019s intent.<\/p><p><strong>WE \/ Western Optronics engineering perspective.<\/strong> This article provides general design-review guidance, not a claim of WE product compliance, qualification results or interoperability with a named platform.<\/p><\/div>\n<div class=\"sources\"><h2>Primary references<\/h2><ol><li><a href=\"https:\/\/www.oiforum.com\/wp-content\/uploads\/OIF-ELSFP-02.0.pdf\">OIF-ELSFP-02.0: External Laser Small Form Factor Pluggable Implementation Agreement<\/a>, January 8, 2025. Relevant sections: \u00a73.4\u20133.4.1, Figures 36\u201337, Table 5 and \u00a73.6.1. Use the full applicable specification for requirements.<\/li><li><a href=\"https:\/\/www.oiforum.com\/wp-content\/uploads\/OIF-MGT-Co-Packaging-ELSFP-01.0.pdf\">OIF: Management of External Light Sources and Co-Packaged Optical Engines<\/a>, November 1, 2022. Informative white paper; see \u00a7\u00a72 and 5 for scope and host-managed connectivity.<\/li><\/ol><p>Editorial scope: original explanatory text and figures; no OIF figure is reproduced. Interface-specific limits and procedures must come from the applicable specifications and supplier documentation.<\/p><\/div>\n<\/div>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>A practical ELSFP interface review: reconcile fiber assignments, polarization evidence and the host resource map, with original diagrams and a reusable qualification checklist.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[143],"tags":[],"class_list":["post-9415","post","type-post","status-publish","format-standard","hentry","category-optical-engineering"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ELSFP Interface Qualification: Fiber Mapping, Polarization and Host Checks - WESTERN OPTRONICS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.westernoptronics.com\/ar\/elsfp-interface-qualification-fiber-mapping-polarization\/\" \/>\n<meta property=\"og:locale\" content=\"ar_AR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ELSFP Interface Qualification: Fiber Mapping, Polarization and Host Checks - 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