10G CWDM SFP+ 1270nm 20km Optical Transceiver
10G CWDM SFP+ transceiver for the 1270nm channel and duplex-LC single-mode links up to 20km, with DDM and commercial-temperature operation.
1270nm CWDM channel · 20km SMF · Duplex LC
A commercial-temperature 10G SFP+ module for adding a 1270nm service to a dual-fiber coarse wavelength-division multiplexing (CWDM) system. Confirm the host, passive-filter channel plan and full optical-loss budget before quotation.
Deployment fit
Use it for
Dual-fiber 10G CWDM links, metro access aggregation and dark-fiber capacity expansion.
Optical path
1270nm channel, single-mode fiber and duplex LC through a matching CWDM mux/demux path.
Confirm first
Host coding, software, both-end modules, channel plan, route loss, temperature and DDM requirements.
Technical specifications
| Product type | 10G CWDM SFP+ optical transceiver |
|---|---|
| Center wavelength | 1270nm |
| Data rate | 10.3Gbps nominal; supports up to 10.7Gbps |
| Maximum reach | Up to 20km over single-mode fiber; actual route loss governs |
| Optical interface | Duplex LC |
| Transmitter / receiver | CWDM DFB laser / PIN photodiode |
| Average transmit power | -3 to +2dBm |
| Receiver sensitivity | Maximum -15dBm |
| Receiver overload | Minimum +0.5dBm |
| Calculated source-limit optical budget | 12dB before fiber, mux/demux, connector, splice and engineering margins |
| Extinction ratio | Minimum 3.5dB |
| Side-mode suppression ratio | Minimum 30dB |
| Digital diagnostics | DDM/DOM supported |
| Supply voltage | 3.135 to 3.465V |
| Operating case temperature | 0 to +70°C commercial variant |
| Form-factor references | SFP+ MSA and SFF-8472 |
The 12dB optical budget is calculated from the documented transmit-power and receiver-sensitivity limits. It is not a guaranteed field margin.
Pre-order engineering checks
- Identify the exact switch, router or line-card model, software release and SFP+ port mode.
- Confirm a 1270nm channel at both ends of the dual-fiber CWDM path and verify mux/demux direction, common ports and fiber polarity.
- Calculate total loss from fiber at 1270nm, passive filters, connectors, splices and engineering margin; use measured loss when available.
- Confirm duplex LC connector polish, commercial 0 to +70°C operation, coding and DDM/DOM requirements.
Compatibility and validation
Compatibility must be validated against the exact host and software environment. Coding recognition, DDM visibility and alarm behavior are separate from optical performance.
For a sample check, confirm inventory recognition, transmit and receive power, alarms, link state, error counters and stability on the intended 1270nm CWDM path.
Frequently asked questions
Which CWDM channel should be ordered for this module?
This exact variant uses the 1270nm CWDM center wavelength. Confirm that the passive mux/demux has a matching 1270nm channel and that the same channel is shown in the approved BOM before ordering.
Do both ends use 1270nm on a dual-fiber CWDM link?
A matched dual-fiber CWDM path normally uses the corresponding 1270nm channel at both endpoints. Confirm both module labels, the mux and demux port plan, common-port direction and fiber polarity. This is not a single-fiber BiDi wavelength pair.
How should the optical budget be checked for a 20km link?
The source limits give a calculated 12dB budget from minimum transmit power of -3dBm to receiver sensitivity of -15dBm. Subtract mux/demux insertion loss, fiber attenuation at 1270nm, connector and splice loss, repair allowance and engineering margin. The 20km label is not a substitute for a route-loss calculation.
Is an attenuator required on a short or low-loss path?
Not automatically. The documented receiver overload limit is +0.5dBm. Estimate or measure received power at both ends, then add attenuation only if the expected level could exceed the receiver limit while preserving sufficient margin above sensitivity.
Is this module compatible with every 10G SFP+ port?
No. SFP+ form factor and data rate do not prove host compatibility. Confirm the device and port, software release, coding profile, monitoring expectations, protocol and any FEC setting at both endpoints.
Does this 1270nm 20km variant support DDM or DOM?
Yes. The exact commercial-temperature ordering variant includes digital diagnostic monitoring. Whether all readings are displayed and accepted still depends on the host platform, software and coding profile.
Is this the industrial-temperature version?
No. This Draft covers the commercial-temperature variant specified for 0 to +70°C. An industrial-temperature option is a separate ordering variant and must be quoted and validated separately.
What should be checked if the CWDM link does not come up?
Check host recognition, configured speed and FEC, the 1270nm channel at both ends, mux/demux direction and common ports, fiber polarity, connector cleanliness, route loss and DDM readings. Capture both-end alarms and optical power before changing components.
Review a 1270nm CWDM link before quotation
Send the host model and software, both-end modules, CWDM mux/demux channel plan, route length and measured loss, connector polish, temperature, coding/DDM expectations, quantity and required date.
Request a configuration reviewFinal specifications follow the approved quotation and product datasheet.