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Finisar FTLC9551SEPM 100G SR4 QSFP28 850nm 100m
100 Gb/s 100G SR4 / 128GFC / 4x28G OTN QSFP28 transceiver, 850nm, up to 100m, commercial temperature.
- Manufacturer
- Coherent Corp. (formerly Finisar / II-VI)
- Mfr part number
- FTLC9551SEPM
- Family
- FTLC955x
- Category
- Fiber optic transceiver modules
- Datasheet
- FTLC9551SEPM datasheet (PDF)
FTLC9551SEPM specifications
| Attribute | Value |
|---|---|
| Manufacturer | Coherent Corp. (Finisar) |
| Manufacturer part number | FTLC9551SEPM |
| Product family | FTLC955x |
| Form factor | QSFP28 |
| Standards / application | QSFP28 MSA; IEEE 802.3bm 100GBASE-SR4; CAUI-4 |
| Data rate | 103.1 Gb/s aggregate; 4x 25.78125 Gb/s |
| Wavelength | 840–860 nm |
| Laser | 4x25Gb/s 850 nm VCSEL-based transmitter |
| Receiver | 4 photodetectors (PIN) |
| Reach | 70 m OM3 / 100 m OM4 (requires host FEC for max distance) |
| Connector | MPO-12 (single MPO12 receptacle) |
| Tx output power | −8.4 to 2.4 dBm avg per lane |
| Rx sensitivity | −5.2 dBm stressed OMA per lane |
| Rx overload / max input | Damage threshold 3.4 dBm per lane |
| Extinction ratio | 2 dB min |
| Supply voltage | 3.3 V (3.135–3.465 V) |
| Power dissipation | FTLC9551REPM: < 3.5 W; FTLC9558REPM: < 2.5 W |
| Operating temperature | Commercial |
| Diagnostics | I2C management/diagnostics interface |
| Compliance | RoHS-6 (2011/65/EU) |
| Lifecycle | Ask for availability |
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 FTLC9551SEPM
The Finisar FTLC9551SEPM (now a Coherent Corp. product, formerly II-VI) is a QSFP28 100G SR4 / 128GFC / 4x28G OTN optical transceiver for 100 Gb/s links at 850nm over MMF parallel (MPO), with reach up to 100m. It is a commercial-temperature part. It belongs to Finisar's FTLC955x family, which has 12 orderable variants that differ by temperature grade, latch, receiver build or wavelength channel. Typical uses: 100G Ethernet data-centre fabrics, DCI, metro aggregation and InfiniBand EDR.
- Hot-pluggable QSFP28 form factor
- Supports 103.1Gb/s aggregate bit rate
- 4x25Gb/s 850nm VCSEL-based transmitter
- 4x25G electrical interface
- Single MPO12 receptacle
- I2C management interface
FTLC9551SEPM: frequently asked questions
What is the Finisar FTLC9551SEPM?
The FTLC9551SEPM is a Finisar QSFP28 transceiver for 100G SR4 / 128GFC / 4x28G OTN at 100 Gb/s. Finisar is now part of Coherent Corp. (formerly II-VI), and the part number is unchanged. It is used for 100G Ethernet data-centre fabrics, DCI, metro aggregation and InfiniBand EDR.
What is the maximum distance of the FTLC9551SEPM?
The FTLC9551SEPM is specified for up to 100m over MMF parallel (MPO). 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 FTLC9551SEPM?
Per the Finisar family datasheet, the FTLC9551SEPM transmits −8.4 to 2.4 dBm avg per lane and has a receiver sensitivity of −5.2 dBm stressed OMA per lane. Maximum receiver input is Damage threshold 3.4 dBm per lane.
Does the FTLC9551SEPM support DDM / digital diagnostics?
Yes. I2C management/diagnostics interface. Your switch can read live temperature, voltage, laser bias and Tx/Rx power.
Which fiber and connector does the FTLC9551SEPM use?
The FTLC9551SEPM works at 850nm over MMF parallel (MPO). Both ends of a link must use the same optical standard.
Will the FTLC9551SEPM work in my Cisco, Juniper, Arista or HPE switch?
The FTLC9551SEPM follows the QSFP28 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.
FTLC9551SEPM vs FTLC9551REPM: what is the difference?
Both are in Finisar's FTLC955x family. They differ in reach (100m vs 100m (OM4)); build / application (100G SR4 / 128GFC / 4x28G OTN vs 100GBASE-SR4 Gen3). Pick the variant that matches your temperature, latch and wavelength needs.
What temperature range is the FTLC9551SEPM rated for?
The FTLC9551SEPM is a commercial-temperature part. Choose an industrial (T) variant for outdoor or uncontrolled sites.
What does the FTLC9551SEPM part number mean?
The FTLC prefix marks Finisar's 100G family (QSFP28 / CFP / CFP2 / CFP4). The C letter in the suffix usually marks the commercial temperature grade. The remaining characters identify the optical design and build variant.
Is your FTLC9551SEPM 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 FTLC9551SEPM price in India and how do I order?
The Finisar FTLC9551SEPM 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 FTLC9551SEPM need?
It runs from 3.3 V (3.135–3.465 V) with power dissipation of FTLC9551REPM: < 3.5 W; FTLC9558REPM: < 2.5 W.
Documents
NextGen datasheetPDF · specs, FAQ & buying guideManufacturer datasheet
Finisar / Coherent family datasheet
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