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Finisar FTLX3971DTC21 DWDM fixed 1.2-11.3G SFP+ 1560.61nm 40km
10 Gb/s class DWDM fixed 1.2-11.3G multirate (EML/APD) SFP+ transceiver, 1560.61nm (ITU C21), up to 40km, industrial temperature.
- Manufacturer
- Coherent Corp. (formerly Finisar / II-VI)
- Mfr part number
- FTLX3971DTC21
- Family
- FTLX3971DTC
- Category
- Fiber optic transceiver modules
- Datasheet
- FTLX3971DTC21 datasheet (PDF)
FTLX3971DTC21 specifications
| Attribute | Value |
|---|---|
| Manufacturer | Coherent Corp. (Finisar) |
| Manufacturer part number | FTLX3971DTC21 |
| Product family | FTLX3971DTC |
| Form factor | SFP+ |
| Standards / application | DWDM fixed 1.2-11.3G multirate (EML/APD) |
| Data rate | 1.2288–11.3176 Gb/s |
| Wavelength | DWDM C-band, 100 GHz, C20–C60 |
| Laser | Cooled 1550 nm EML |
| Reach | 40 km over G.652 SMF |
| Connector | Duplex LC |
| Tx output power | +1 to +4 dBm (sign of min as extracted) |
| Rx sensitivity | −24.0 dBm (0 ps/nm); −22.0 dBm (800 ps/nm) |
| Rx overload / max input | −10 dBm (<9.83 Gb/s); −7 dBm (≥9.83 Gb/s) |
| Extinction ratio | 8.2 dB |
| Supply voltage | 3.3 V (3.14–3.46 V) |
| Power dissipation | 1.6 W max |
| Operating temperature | Industrial |
| Diagnostics | Digital diagnostics via 2-wire serial interface |
| Lifecycle | Current production |
| Variant note | ITU 100 GHz channel C21 |
Optical and electrical values are from the Finisar / Coherent family datasheet; temperature grade is per part number. Confirm critical values with us before ordering.
About the Finisar FTLX3971DTC21
The Finisar FTLX3971DTC21 (now a Coherent Corp. product, formerly II-VI) is a SFP+ DWDM fixed 1.2-11.3G multirate (EML/APD) optical transceiver for 10 Gb/s class links at 1560.61nm (ITU C21) over Duplex SMF LC, with reach up to 40km. It is an industrial-temperature part. It belongs to Finisar's FTLX3971DTC family, which has 41 orderable variants that differ by temperature grade, latch, receiver build or wavelength channel. Typical uses: 10G Ethernet, 10G Fibre Channel, SONET OC-192 / OTN and DWDM metro / DCI links.
- 100 GHz spacing, DWDM C-band
- Up to 40km link length
- 1.2 through 11.3 Gb/s data rates
- Cooled 1550nm EML laser
- -40/85°C case temperature range
FTLX3971DTC21: frequently asked questions
What is the Finisar FTLX3971DTC21?
The FTLX3971DTC21 is a Finisar SFP+ transceiver for DWDM fixed 1.2-11.3G multirate (EML/APD) at 10 Gb/s class. Finisar is now part of Coherent Corp. (formerly II-VI), and the part number is unchanged. It is used for 10G Ethernet, 10G Fibre Channel, SONET OC-192 / OTN and DWDM metro / DCI links.
What is the maximum distance of the FTLX3971DTC21?
The FTLX3971DTC21 is specified for up to 40km over Duplex SMF LC. Long-reach optics may need an attenuator on short links; we can advise based on your link loss.
What is the optical power budget of the FTLX3971DTC21?
Per the Finisar family datasheet, the FTLX3971DTC21 transmits +1 to +4 dBm (sign of min as extracted) and has a receiver sensitivity of −24.0 dBm (0 ps/nm); −22.0 dBm (800 ps/nm). Maximum receiver input is −10 dBm (<9.83 Gb/s); −7 dBm (≥9.83 Gb/s).
Does the FTLX3971DTC21 support DDM / digital diagnostics?
Yes. Digital diagnostics via 2-wire serial interface. Your switch can read live temperature, voltage, laser bias and Tx/Rx power.
Which fiber and connector does the FTLX3971DTC21 use?
The FTLX3971DTC21 works at 1560.61nm (ITU C21) over Duplex SMF LC. CWDM/DWDM optics must match the channel of your mux/demux port. Both ends of a link must use the same optical standard.
Will the FTLX3971DTC21 work in my Cisco, Juniper, Arista or HPE switch?
The FTLX3971DTC21 follows the SFP+ MSA, so it fits any matching port. It carries Finisar's own EEPROM programming; switches that check the module vendor may need a configuration setting or a vendor-branded optic. Send us your switch model and we confirm before dispatch.
FTLX3971DTC21 vs FTLX3971DTC20: what is the difference?
Both are in Finisar's FTLX3971DTC family. They differ in wavelength (1560.61nm (ITU C21) vs 1561.42nm (ITU C20)). Pick the variant that matches your temperature, latch and wavelength needs.
What temperature range is the FTLX3971DTC21 rated for?
The FTLX3971DTC21 is an industrial-temperature part. Industrial grade suits outdoor cabinets, telecom huts and plant floors.
What does the FTLX3971DTC21 part number mean?
The FTLX prefix marks Finisar's 10G family (SFP+, XFP, X2, XENPAK). The I letter in the suffix usually marks the industrial temperature grade. The remaining characters identify the optical design and build variant.
Is your FTLX3971DTC21 genuine Finisar?
Yes. Next Gen Networks supplies original Finisar / Coherent modules, not third-party lookalikes or grey-market stock, and shares serial numbers on request.
What is the FTLX3971DTC21 price in India and how do I order?
The Finisar FTLX3971DTC21 price in India depends on quantity, delivery city and current stock. Next Gen Networks supplies it with a GST invoice (input tax credit ready) and pan-India dispatch from New Delhi. Send the part number, quantity and delivery city on WhatsApp +91-7827955775 or email Sales@nextgennetworks.in for a GST quote.
What power does the FTLX3971DTC21 need?
It runs from 3.3 V (3.14–3.46 V) with power dissipation of 1.6 W max.
Documents
NextGen datasheetPDF · specs, FAQ & buying guideManufacturer datasheet
Finisar / Coherent family datasheet
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