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Finisar FTL4C1QL3C 40G LR4 Lite QSFP+ 2km
40 Gb/s 40G LR4 Lite QSFP+ transceiver, CWDM 1271-1331nm, up to 2km, commercial temperature.
- Manufacturer
- Coherent Corp. (formerly Finisar / II-VI)
- Mfr part number
- FTL4C1QL3C
- Family
- FTL4C1
- Category
- Fiber optic transceiver modules
- Datasheet
- FTL4C1QL3C datasheet (PDF)
FTL4C1QL3C specifications
| Attribute | Value |
|---|---|
| Manufacturer | Coherent Corp. (Finisar) |
| Manufacturer part number | FTL4C1QL3C |
| Product family | FTL4C1 |
| Form factor | QSFP+ |
| Standards / application | QSFP+ MSA; IEEE 802.3ba 40GBASE-LR4; XLPPI (QM variants also OTU3/OTU3e1/OTU3e2) |
| Data rate | 41.2 Gb/s aggregate; 10.3 Gb/s per lane (QM: 39.8–44.6 Gb/s multirate) |
| Wavelength | 1264.5–1277.5 / 1284.5–1297.5 / 1304.5–1317.5 / 1324.5–1337.5 nm |
| Laser | Uncooled 4x10Gb/s CWDM transmitter (DFB) |
| Receiver | 4 photodetectors (PIN), 10.3 Gb/s each |
| Reach | 10 km SMF (QL 'Lite' variants: 2 km SMF) |
| Connector | Duplex LC |
| Tx output power | −7.0 to 2.3 dBm avg per lane |
| Rx sensitivity | −11.5 dBm OMA per lane (stressed −9.6 dBm, QE3C) |
| Rx overload / max input | Damage threshold 3.4 dBm per lane |
| Extinction ratio | 3.5 dB min |
| Supply voltage | 3.3 V (3.1–3.47 V) |
| Power dissipation | < 3.5 W (QW2N: < 2.8 W) |
| Operating temperature | Commercial |
| Diagnostics | Built-in digital diagnostics incl. Tx/Rx power monitoring (I2C per QSFP+ MSA) |
| Compliance | RoHS-6 |
| Lifecycle | Current production |
| Variant note | 2 km, commercial temp, Gen3 (EPS listing) |
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 FTL4C1QL3C
The Finisar FTL4C1QL3C (now a Coherent Corp. product, formerly II-VI) is a QSFP+ 40G LR4 Lite optical transceiver for 40 Gb/s links at CWDM 1271-1331nm over SMF duplex (LC), with reach up to 2km. It is a commercial-temperature part. It belongs to Finisar's FTL4C1 family, which has 13 orderable variants that differ by temperature grade, latch, receiver build or wavelength channel. Typical uses: 40G Ethernet aggregation, spine links and 4 × 10G breakout.
- Hot-pluggable QSFP+ form factor
- Uncooled 4x10Gb/s CWDM transmitter
- XLPPI electrical interface
- I2C interface per QSFP+ MSA
- Built-in digital diagnostic functions
- RoHS-6 compliant
FTL4C1QL3C: frequently asked questions
What is the Finisar FTL4C1QL3C?
The FTL4C1QL3C is a Finisar QSFP+ transceiver for 40G LR4 Lite at 40 Gb/s. Finisar is now part of Coherent Corp. (formerly II-VI), and the part number is unchanged. It is used for 40G Ethernet aggregation, spine links and 4 × 10G breakout.
What is the maximum distance of the FTL4C1QL3C?
The FTL4C1QL3C is specified for up to 2km over SMF duplex (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 FTL4C1QL3C?
Per the Finisar family datasheet, the FTL4C1QL3C transmits −7.0 to 2.3 dBm avg per lane and has a receiver sensitivity of −11.5 dBm OMA per lane (stressed −9.6 dBm, QE3C). Maximum receiver input is Damage threshold 3.4 dBm per lane.
Does the FTL4C1QL3C support DDM / digital diagnostics?
Yes. Built-in digital diagnostics incl. Tx/Rx power monitoring (I2C per QSFP+ MSA). Your switch can read live temperature, voltage, laser bias and Tx/Rx power.
Which fiber and connector does the FTL4C1QL3C use?
The FTL4C1QL3C works at CWDM 1271-1331nm over SMF duplex (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 FTL4C1QL3C work in my Cisco, Juniper, Arista or HPE switch?
The FTL4C1QL3C follows the QSFP+ 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.
FTL4C1QL3C vs FTL4C1QL1L: what is the difference?
Both are in Finisar's FTL4C1 family. They differ in build / application (40G LR4 Lite vs 40GBASE-LR4 Lite Gen2). Pick the variant that matches your temperature, latch and wavelength needs.
What temperature range is the FTL4C1QL3C rated for?
The FTL4C1QL3C is a commercial-temperature part. Choose an industrial (T) variant for outdoor or uncontrolled sites.
What does the FTL4C1QL3C part number mean?
The FTL4 prefix marks Finisar's 40G QSFP+ family. The C letter in the suffix usually marks the commercial temperature grade. The remaining characters identify the optical design and build variant.
Is your FTL4C1QL3C 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 FTL4C1QL3C price in India and how do I order?
The Finisar FTL4C1QL3C 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 FTL4C1QL3C need?
It runs from 3.3 V (3.1–3.47 V) with power dissipation of < 3.5 W (QW2N: < 2.8 W).
Documents
NextGen datasheetPDF · specs, FAQ & buying guideManufacturer datasheet
Finisar / Coherent family datasheet
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