APPLICATION TO PURCHASE LINES
A cwdm sfp module factory quotation follows the channel plan of the mux, not a generic 1G badge. Write the project use, the fiber plant, and the delivery stages before two plants answer different wavelengths under one price.
ITU-T G.694.2 nominal CWDM spacing is 20 nm, with eighteen wavelengths from 1271 nm through 1611 nm. The upper band, 1471 nm to 1611 nm, is the common question on older G.652 fiber. The lower band, 1271 nm to 1451 nm, needs a low-water-peak fiber such as G.652.D. Ask which band the mux actually passes.
| Route | What to record | What stays a separate line |
|---|---|---|
| Metro access span | Channel in nanometers, single-mode plant, estimated loss, and whether the far end is a mux or a grey optic. | Mux insertion loss, dispersion, and any attenuation pad. Do not fold those into the SFP unit figure. |
| Campus building riser | Fiber type already pulled, connector at the panel, and the host in the closet. A 2 km campus run is not an 80 km class. | Panel jumpers and polarity. A crossed pair is an installation fault, not a module defect. |
| Data-hall handoff | Whether the handoff is single-mode CWDM or a short multimode grey link. Those two cannot share a price cell. | Cage power and airflow. A dense top-of-rack row may reject an industrial-temp part for thermal reasons even when the wavelength matches. |
| Industrial cabinet | Ambient from −40 °C to 85 °C if that is the site, ingress of the cabinet, and who accepts the module at incoming inspection. | The cabinet, the rectifier, and the runtime of the DC plant. Those are infrastructure lines, not SFP attributes. |
Delivery stages belong in the brief: document review, sample if you require one, incoming inspection, and who signs a deviation. A public ITU optical-fibre page checked on 2026-10-27 is a question source. It does not approve a channel plan. The module rows and the RFQ desk carry the same packet.
A sheet that says “CWDM 1G” without 1471, 1491, 1511, 1531, 1551, 1571, 1591, or 1611 nm is not a quotation. Ask for the nominal wavelength, the passband, and the mux slot it must occupy. Adjacent channels that your filter cannot pass are a different purchase.
Request minimum transmit power and receiver sensitivity for that channel. Add mux insertion loss, typically a few decibels depending on channel count, plus connectors. If the sum exceeds the module budget, the lower unit figure is not usable on that route. Do not publish a percentage saving from a channel the mux rejects.
OEM-coded modules may track a vendor support policy more closely. Compatible codes may widen the factory list when the exact platform accepts them. New and refurbished offers stay apart until condition, warranty months, and EEPROM history are written. This page does not rank factories and does not claim a cage test.
Background: a US integrator needed 1G CWDM optics for two metro laterals and had quotes that mixed 1471 nm with 1551 nm under one carton price. Process: the brief forced both plants to answer channel, 20 nm grid, LC duplex, commercial versus industrial temperature, DOM, quantity 64 pieces, and an Ohio destination. Result: one offer dropped the 1551 nm passband of the installed mux, so the unit figures were left unranked until the channel lists matched.
List open choices: band, exact nanometers, fiber water-peak class, temperature window, and whether a grey 1310 nm optic is allowed as an alternate. An alternate needs its own optical budget. It is not a silent substitute.
Read the evidence guide when the remaining dispute is EEPROM identity rather than the route.
QUALIFIED BUSINESS BUYERS
Factory quotations are lined up after the 1G SFP specification is written down.
Eligibility applies to qualified business buyers and is confirmed after we review your product, quantity, destination, and sourcing requirements.