Direct answer
OSFP and QSFP-DD identify module form factors and host interfaces. Choose fiber patch cords from the complete optical-module part number, then verify optical ports, fiber type, polarity and operating mode. Cross-form-factor optical links require approval for the actual module and host combination.
Separate the host package from the optical connection
An RFQ saying “800G OSFP fiber cable” is incomplete. OSFP and QSFP-DD describe the module at the host; MPO and LC describe its optical connection. NVIDIA's connector definitions explain the package distinction. Cisco's product tables show different optical ports within a package family.
This matters for AI switch interconnects, NIC links and spare-part management. The equipment owner approves the module on the host. The passive-assembly supplier works from the approved optical-side requirements. Keep the two approvals connected but separately identifiable.
Translate specific module references into fiber requirements
These Cisco examples illustrate the review process. They are not ARRANEX transceiver offerings or approval for arbitrary module pairs.
| Official example | Package | Listed optical connection | Fiber purchasing check |
|---|---|---|---|
| OSFP-800G-DR8 | OSFP | Dual MPO-12 APC | Port identity, singlemode fiber and per-fiber mapping |
| OSFP-800G-DR8P | OSFP | MPO-16 APC | 16-position interface, pins, keying and remote port |
| OSFP-2X400G-FR4 | OSFP | Dual duplex LC UPC | Two duplex paths, Tx/Rx and labels |
| QDD-2X400G-FR4 | QSFP-DD | Dual duplex LC UPC | Approved host reference and two-port operating mode |
The examples come from Cisco's OSFP data sheet and QSFP-DD800 data sheet. The OSFP document specifies pinned MPO module ports requiring corresponding unpinned cable connectors. Apply this requirement only to covered configurations.
If a product table conflicts with a note or ordering description, stop ordering that configuration and obtain the manufacturer's approved specification revision. Do not fill the gap using another module with the same package.
RFQ from the equipment outward
| Review boundary | Buyer input | Required output |
|---|---|---|
| Host | Equipment, port, software and complete module reference | Supported module and operating mode |
| Optical module | Both-end data-sheet revisions, ports and fiber types | Matching optical applications |
| Passive assembly | Connectors, fiber map, length datum and routing envelope | Reviewable drawing and BOM |
| Acceptance | Per-channel loss limits, mapping and system requirements | Separate passive and system records |
Obtain both ends before ordering. An MPO-16 port at one end does not define the remote connector, fanout or polarity. For a dual-port module, identify where P1 and P2 terminate instead of treating the two service ports as one unspecified “800G link.”
Can different packages connect through fiber?
Different packages do not automatically prevent optical interoperability. Approval depends on the optical application, rate, wavelength, channel structure and both host configurations. Ask the equipment owner to approve the module pair and associate that approval with the cable drawing.
Identical LC connectors can serve different optical applications. MPO connections can differ in fiber positions and polish. A passive jumper cannot correct an incompatible optical scheme or add unsupported host breakout modes.
Procurement FAQ
- Do all OSFP optics use MPO? No. Specific references can use MPO or LC, as the examples show.
- Can OSFP replace QSFP-DD directly in a host? Do not assume direct insertion. Follow the host-approved package, module and any dedicated conversion solution.
- Does 800G always require 16 fibers? Determine the optical connection and service mode first; single MPO, dual MPO and dual duplex LC differ.
- Does the cable supplier need the switch software version? The equipment owner checks host support; the cable supplier needs the resulting approved optical configuration and mapping.
- Can existing jumpers be reused? Review connectors, fiber, mapping, length and test records after the module pair is approved.
Related products and reading
- 800G MPO interface comparison
- AOC versus passive cabling
- 16F/32F multifiber assemblies
- Data-center interconnects
Product pages describe configuration scopes. Supply, drawings and performance require project-specific confirmation.
Contact an engineer
Prepare both-end interfaces, drawings or existing test records and contact an engineer to discuss assembly requirements and verification boundaries.
Sources and review date
Sources checked on 2026-10-13. Third-party references explain technology and specific examples, not ARRANEX performance or certification. Purchasing tables are review recommendations; example assumptions apply only to the calculations.
Sources checked: 2026-10-13