CWDM4 Technology: Four Wavelengths on One Fibre Pair
CWDM4 technology carries 100G over a single fibre pair by multiplexing four coarse wavelengths, each carrying 25G, onto that pair. This guide explains the technology at concept level and links to the CWDM4 product page with a listed specification on this site.
What this page covers
This page is a guide page for CWDM4 technology. It gathers the models and guidance that belong to this line in one place, and it links to the individual product pages where a model has a listed specification. Lines that have only a title-level mention, with no detailed specification behind them, are described here at category level only and are not given a product page, because a product page without a listed specification would be guessing.
The distinction matters for buying. A category page answers which line a need belongs to and what to ask about; a product page answers the listed figures for one model. If you arrive here looking for a figure for a specific model, follow the link to that model page, and if no model page is linked, the figure is not published on this site and should be asked for in the enquiry rather than inferred from a neighbouring model.
How to specify this line
A usable enquiry for CWDM4 technology starts with the rate, the wavelength, the fibre type and the distance, because those four items decide whether a module fits the link at all. The connector and the form factor come next, followed by the operating temperature range and whether digital diagnostics are required. Buyers who send only a rate, or only a model-style name, usually need a second round of questions before a quotation can be confirmed, so including the full set in the first message saves a cycle.
Distance figures deserve special care. A distance quoted for one fibre type does not transfer to another, and a distance quoted for one wavelength does not transfer to a different wavelength. On this site every distance is tied to the fibre and wavelength it was listed with, and where the source pages disagree the conflict is flagged on the page. If a distance matters for your link, name the fibre you will actually install and ask for the figure to be confirmed against that fibre before ordering.
What to confirm before ordering
Before an order is placed, confirm the model, the rate, the wavelength, the distance, the connector and the quantity in writing, and confirm any certification document you need by name. Minimum order quantity and lead time are unavailable at company level on this site, so ask for both per model in the enquiry rather than assuming a company-wide term. Quotations are confirmed per order, and specifications are confirmed per model before payment.
Compatibility is a separate check from the optical figures. A module that matches on rate and wavelength can still fail on a host platform that does not accept it, so name the host platform in the enquiry when compatibility matters. Where this site states a compatibility position, it states the source of that position, and it does not extend a compatibility statement from one model to another. If the platform is not named, compatibility cannot be confirmed from this page alone.
How CWDM4 reaches 100G
CWDM4 reaches 100G by running four lanes in parallel, each on its own coarse wavelength, and combining them onto one fibre pair with a multiplexer inside the module. The line rate is therefore four lanes of 25.78125 gigabits per second, totalling 103.125 gigabits per second, and the host must enable RS-FEC to recover the signal. The four wavelengths sit in the 1310nm region, which is why CWDM4 modules are single-mode modules and why their reach is measured in kilometres rather than metres.
The CWDM4 product page on this site lists the module at 1310nm over up to 2km including channel insertion loss of up to 5 dB. The loss budget matters as much as the distance: a link within 2km but with excessive connector or splice loss is outside the listed budget. State the link length and the connector count in the enquiry when the loss budget is tight, and confirm the host forward error correction requirement before ordering.
Models on this page
QSFP 100G CWDM4 Module
100G single-mode CWDM4 module at 1310nm over up to 2km.
Enquiry checklist
Before sending an enquiry, note the model or the rate you need, the wavelength, the fibre type, the distance, the connector, the quantity and the application. State whether the module must be compatible with a named host platform, and name any certification document you need. Minimum order quantity and lead time are unavailable at company level and are confirmed per model in the enquiry. Quotations are confirmed per order.
Send an enquiry | Sales contact: Ms. Vicky Tian, Sales Manager, +86 19860146913 | Telephone: 86-0755-82552969 | Email: [email protected]
Frequently asked questions
How do I get a quotation?
Send an enquiry naming the model, the rate, the wavelength, the distance and the quantity you need, plus the application. Quotations are confirmed per order, and specifications are confirmed per model before payment. This site does not list fixed selling figures, and no price is shown for any model.
What certification documents can you provide?
The company states ISO 9001, CE, FC, 3C and RoHS names. Certificates are available upon request. If a buyer needs a certificate for a specific model, name the model in the enquiry so the correct document can be checked. No certificate numbers are published on this site.
Do the specifications on one page apply to the whole range?
No. Specifications are shown per model and must not be read across the whole range. Where a value is not listed for a model, the page says to confirm per model rather than filling in a generic figure, and where the source pages disagree, the page flags the conflict instead of choosing one value as fact.
What are the minimum order quantity and lead time?
At company level both are unavailable on this site and are confirmed per model in the enquiry. A single-model note, where one exists, is marked as applying to that model only and must not be read as a company-wide term.