Select data center fiber from the optical-interface and channel requirements, then translate those requirements into a purchasing specification. Begin with equipment, channel length, connection layout and the allowed loss budget. Review the fiber type required by that design rather than assuming that all data center links use the same category. When comparing the listed OM3 and OM4 references, keep bandwidth type, wavelength and geometry together; a bandwidth figure alone does not establish Ethernet reach. Also distinguish coated fiber for cable manufacturing from finished assemblies. The bare-fiber table does not describe connector performance or prove the completed channel. Confirm the offered supplier specification, cable or assembly scope and documentation needed for the project’s acceptance process.
Begin with equipment and the channel definition
Record the actual optical interface and its channel requirements. Identify the path length, connection points and any splices or other loss contributions. Use those requirements to decide which fiber specifications need review. Do not build a reach claim from a general article title or the application label “data center.”
If the equipment or interface has not been selected, record that as an open decision. A fiber quotation can then be discussed with clear limits instead of silently assuming an equipment configuration.
Compare OM3 and OM4 in that context
The reference OM3 and OM4 products here both use nominal 50/125 μm geometry and include effective modal bandwidth at 850 nm. Read those specifications alongside attenuation and the exact coating requirement. Consult the comparison guide for the source-specific values.
If the design calls for a different fiber type, review that requirement directly. Do not substitute a multimode grade or a single-mode product simply because its headline specification looks attractive. The offered material must fit the actual system design.
Separate bare fiber from the finished assembly
A request for coated fiber on reels should specify optical and geometry requirements, coating, quantity and reel allocation. A finished assembly also has construction, connector and completed-assembly requirements. Keep those scopes separate so that a bare-fiber reference is not used as evidence for properties it does not describe.
Agree which supplier or project party verifies each part of the completed channel. Preserve the accepted specification and relevant records with the procurement documents.
Prepare the material approval package
Ask for the offered product sheet, traceable reel or batch information and the applicable quality report. State any additional qualification requirement before ordering. Use the RFQ checklist to carry these details into a contact request, then confirm price and delivery against the agreed specification.
What to confirm
- Optical interface and intended fiber type
- Channel length and connection layout
- Loss budget and acceptance requirements
- Bare-fiber versus assembly purchasing scope
- Offered specification and traceable records
Frequently asked questions
Does every data center link need OM4?
No universal grade is specified here. Start with the actual optical interface and channel requirements.
Can I determine reach from the OM3 or OM4 bandwidth figure?
Not from that figure alone. Use the supported requirements of the intended interface and complete channel.
Do reel specifications prove connectorized cable performance?
No. Finished assemblies require their own applicable construction and performance verification.
Sources & reference context
This guide is published by OpticFiberHub and summarizes the supplier literature identified below with editorial purchasing guidance. Product values describe the source grade, not a measured result or a conformity guarantee for a new order.
- G.652.D reference specifications — Jiangsu Nanfang Optical Fiber Product Manual, pages 3–4.
- OM3 reference specifications — Jiangsu Nanfang Optical Fiber Product Manual, pages 13–14.
- OM4 reference specifications — Jiangsu Nanfang Optical Fiber Product Manual, pages 15–16.
Quality & technical resources explains source selection, translated documents and the limits of historical batch records. Request the current specification and applicable records for the actual offered material.
Further terminology reference: The Fiber Optic Association: optical fiber fundamentals.
Single-mode standard references: ITU-T G.652 and ITU-T G.657. Supplier reference values above must not be mistaken for a reproduction of every requirement in those Recommendations.
