Channel map
Reserve exact wavelengths, guard constraints and future slots.
Product guides
CWDM vs DWDM: Wavelength-System Decision Guide
Select the wavelength system from the required capacity, route physics and expansion plan—not from channel spacing alone.
CWDM uses wider channel spacing and typically simpler uncooled optics, making it attractive for moderate channel counts and passive point-to-point routes. The available bands and component loss must still fit the real link.
DWDM supports denser channel plans and an ecosystem for amplification, ROADMs and long-haul engineering. That flexibility adds wavelength control, optical-signal-to-noise, dispersion and operational requirements that must be designed together.
MingApex coordinates China-based sourcing, OEM execution and independent quality-control evidence. It is not presented as the product manufacturer or an accredited laboratory; supplier identity, method and evidence boundary remain explicit.
01 / Decision inputs
Freeze the variables before comparing options
Model the complete route and growth case before assigning wavelengths.
| Required input | What to record | How it changes the decision |
|---|---|---|
| Route length | Fibre kilometres and topology | Length drives loss, latency and amplification options. |
| Loss inventory | Fibre attenuation, connectors, splices, MUX/DEMUX and margin | Passive component loss can dominate the budget. |
| Channel requirement | Initial and five-year channel count | Growth may justify a denser system. |
| Per-channel rate | 10G/25G/100G/400G and modulation | Rate changes dispersion and OSNR tolerance. |
| Optical bands | Allowed wavelengths and existing equipment | Band conflicts can make a nominal plan unusable. |
| Active elements | Amplifiers, ROADMs, monitors and power availability | Active architecture changes operations and failure modes. |
| Operations | Wavelength inventory, sparing and field skill | Complexity must match the operating team. |
02 / Engineering comparison
Compare on measurable engineering criteria
Calculate optical physics and operating complexity as one system.
End-to-end loss
Include every passive and active element with engineering margin.
OSNR and amplification
For amplified DWDM, verify gain, noise figure and power equalization.
Dispersion and reach
Check rate-specific chromatic-dispersion and coherent/direct-detect limits.
Lifecycle operations
Define monitoring, spares, wavelength labelling and change control.
03 / Product anchors
Live product examples for a controlled starting point
These live SKUs anchor the physical family. Suitability still depends on the documented host, fibre path and validation scope.
Live product page10G SFP+ 1310nm LR 10km LC TransceiverSingle-mode LR referenceLive product page10G SFP+ 1550nm ER 40km LC TransceiverLong-reach power-budget referenceLive product page100G QSFP28 LR4 10km LC TransceiverFour-wavelength duplex-LC referenceLive product page400G QSFP-DD FR4 2km LC Transceiver400G duplex-LC thermal reference
A product page is a starting specification, not universal compatibility or lot-acceptance evidence.
04 / Decision patterns
Choose by evidence, not shorthand
Channel density is only one decision variable.
Preferred path
Choose CWDM for a bounded passive route with moderate channels, sufficient loss margin and no amplification requirement.
Conditional path
Choose DWDM when channel growth, amplification or network reconfiguration justifies the added optical and operational controls.
Stop and redesign
Stop when the route loss, band plan, dispersion or operating capability has not been measured well enough to close the design.
Revalidation trigger
Revalidate any route, MUX/DEMUX, channel rate, wavelength grid, amplifier, connector or growth-plan change.
05 / Validation path
From requirement lock to approved order line
Validate the populated channel plan at representative power and traffic conditions.
- 1
Freeze the requirement
Record the exact host, port, data rate, reach, fibre path and commercial scope for CWDM vs DWDM.
- 2
Compare complete architectures
Include optics, fibre, connectors, power, cooling, software and operational constraints—not only unit price.
- 3
Define measurable acceptance
Set loss, telemetry, link, error, traffic and documentation criteria before selecting the sample.
- 4
Validate the named configuration
Test the serialized sample on the recorded setup and close deviations with an owner and deadline.
- 5
Bridge approval to production
Match the approved identity, revision, coding and critical attributes to the production lot and repeat order.
06 / Risk control
Failure modes that invalidate the decision
Nominal-reach claim
Route loss and passive component loss are omitted.
Grid mismatch
Optics and MUX/DEMUX use different wavelength plans.
Amplifier shortcut
Gain is added without OSNR and equalization design.
Growth dead end
Initial cost ignores future channel or rate migration.
07 / Evidence
Downloadable process references
08 / Buyer questions
Guide-specific questions
What does this guide decide?
The comparison applies to the recorded fibre route, loss, connector/splice inventory, channel count, data rates and growth horizon. It is not a blanket reach promise.
What must the buyer provide?
Provide route topology, measured loss, fibre type, initial/future channels, per-channel rates, existing passive/active equipment and operations constraints.
When is the preferred path conditional?
Choose DWDM when channel growth, amplification or network reconfiguration justifies the added optical and operational controls.
What must be revalidated?
Revalidate any route, MUX/DEMUX, channel rate, wavelength grid, amplifier, connector or growth-plan change.
Connected authority paths
Continue through compatibility, quality and evidence
Controlled next step
Build the channel plan from the measured route.
Send the topology, loss inventory, channel count, rates and growth plan for a bounded CWDM/DWDM recommendation.