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Finisar FWLF1631R20 DWDM OC-48/STM-16 SFP 1561.42nm 160km
up to 2.67 Gb/s DWDM OC-48/STM-16 long-reach (2.67G), APD SFP transceiver, 1561.42nm (192.0THz, ITU ch20), up to 160km.
- Manufacturer
- Coherent Corp. (formerly Finisar / II-VI)
- Mfr part number
- FWLF1631R20
- Family
- FWLF1631R
- Category
- Fiber optic transceiver modules
- Datasheet
- FWLF1631R20 datasheet (PDF)
FWLF1631R20 specifications
| Attribute | Value |
|---|---|
| Manufacturer | Coherent Corp. (Finisar) |
| Manufacturer part number | FWLF1631R20 |
| Product family | FWLF1631R |
| Form factor | SFP |
| Standards / application | OC-48 LR-2 |
| Data rate | 0.155–2.7 Gb/s (SONET OC-3/12/48) |
| Wavelength | 100 GHz ITU grid C-band, 45 channels: ch17 191.7 THz/1563.86 nm to ch61 196.1 THz/1528.77 nm |
| Laser | Temperature-stabilized DWDM-rated low-dispersion DFB |
| Receiver | APD |
| Reach | Up to 180 km; total link budget 31–34 dB @2.5 Gb/s, BER<10⁻¹²; dispersion penalty 3.0 dB @3200 ps/nm |
| Tx output power | +3 to +7 dBm |
| Rx sensitivity | −28 dBm @2.5 Gb/s, BER<10⁻¹² |
| Rx overload / max input | −9 dBm; damage threshold +6 dBm |
| Extinction ratio | 8.2 dB |
| Supply voltage | 3.3 V (3.13–3.50 V) |
| Power dissipation | 1.25 W max (Icc 380 mA) |
| Operating temperature | −5 to 70 °C case |
| Compliance | CDRH and IEC-825 Class 1 |
| Lifecycle | Legacy / end-of-life |
| Variant note | ITU 100 GHz channel 20 (ordering table: 20 = 192.0 THz) |
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 FWLF1631R20
The Finisar FWLF1631R20 (now a Coherent Corp. product, formerly II-VI) is a SFP DWDM OC-48/STM-16 long-reach (2.67G), APD optical transceiver for up to 2.67 Gb/s links at 1561.42nm (192.0THz, ITU ch20) over SMF, with reach up to 160km. It belongs to Finisar's FWLF1631R family, which has 45 orderable variants that differ by temperature grade, latch, receiver build or wavelength channel. This is a legacy Finisar part; we help buyers find remaining stock or a current Coherent alternative. Typical uses: Gigabit Ethernet, 1/2/4G Fibre Channel SAN, SONET OC-48 / STM-16 and CWDM/DWDM metro links.
- Up to 2.7 Gb/s bi-directional data links
- Link distances up to 180 km
- High launch power (+3 dBm min)
- Temperature-stabilized DWDM-rated DFB laser transmitter
- Wavelength controlled within ±0.1 nm over life and temperature
- OC-48 LR-2 compliant
FWLF1631R20: frequently asked questions
What is the Finisar FWLF1631R20?
The FWLF1631R20 is a Finisar SFP transceiver for DWDM OC-48/STM-16 long-reach (2.67G), APD at up to 2.67 Gb/s. Finisar is now part of Coherent Corp. (formerly II-VI), and the part number is unchanged. It is used for Gigabit Ethernet, 1/2/4G Fibre Channel SAN, SONET OC-48 / STM-16 and CWDM/DWDM metro links.
What is the maximum distance of the FWLF1631R20?
The FWLF1631R20 is specified for up to 160km over SMF. 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 FWLF1631R20?
Per the Finisar family datasheet, the FWLF1631R20 transmits +3 to +7 dBm and has a receiver sensitivity of −28 dBm @2.5 Gb/s, BER<10⁻¹². Maximum receiver input is −9 dBm; damage threshold +6 dBm.
Which fiber and connector does the FWLF1631R20 use?
The FWLF1631R20 works at 1561.42nm (192.0THz, ITU ch20) over SMF. 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 FWLF1631R20 work in my Cisco, Juniper, Arista or HPE switch?
The FWLF1631R20 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.
FWLF1631R20 vs FWLF1631R17: what is the difference?
Both are in Finisar's FWLF1631R family. They differ in wavelength (1561.42nm (192.0THz, ITU ch20) vs 1563.86nm (191.7THz, ITU ch17)). Pick the variant that matches your temperature, latch and wavelength needs.
What does the FWLF1631R20 part number mean?
The FWLF prefix marks Finisar's CWDM / DWDM wavelength-specific SFP family. The remaining characters identify the optical design and build variant.
Is the FWLF1631R20 still available?
The FWLF1631R20 is a legacy Finisar part, so new production is limited or ended. Next Gen Networks helps source remaining genuine stock and can suggest a current Coherent alternative with the same reach and wavelength.
What is the FWLF1631R20 price in India and how do I order?
The Finisar FWLF1631R20 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 FWLF1631R20 need?
It runs from 3.3 V (3.13–3.50 V) with power dissipation of 1.25 W max (Icc 380 mA).
Documents
NextGen datasheetPDF · specs, FAQ & buying guideManufacturer datasheet
Finisar / Coherent family datasheet
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