DFT Telecom – High-Performance Optical Transceivers 100G QSFP28 LR 10km LC Transceiver

Features

· Compliant with IEEE 802.3ba 100GBASE-LR4 standard

· Electrical interface compliant with QSFP28 MSA and CAUI-4

· Hot-pluggable QSFP28 form factor

· 4-channel WDM design with LAN-WDM wavelengths (1295.56–1309.14 nm)

· Supports up to 10 kilometers over single-mode fiber (SMF)

· Duplex LC connector interface

· Low power consumption (<3.5W)

· Operating case temperature: 0°C to +70°C (commercial), optional -40°C to +85°C (industrial)

· Digital diagnostics monitoring via I²C interface (SFF-8636 Rev 2.10a)

· Fully RoHS compliant and lead-free

 

Applications

· 100 Gigabit Ethernet in data centers and enterprise networks

· High-speed interconnects between switches, routers, and servers

· Metro access and aggregation networks

· Cloud infrastructure and high-performance computing (HPC)

· Upgrade of existing 10G/40G network backbones

 

Product Description

The FT-QSFP28-LR-10KM is a high-performance, four-lane 100Gbps QSFP28 transceiver designed for long-reach optical communication over standard single-mode fiber. It supports link distances of up to 10 kilometers, making it ideal for cost-effective, high-density 100G deployments.

This module uses four independent optical lanes at LAN-WDM wavelengths, each transmitting and receiving at 25.78 Gbps, aggregated into a total line rate of 103.125 Gbps (CAUI-4). The transmitter employs four uncooled DFB lasers, while the receiver uses a PIN photodiode array with TIAs. All signals are routed through a duplex LC connector using wavelength division multiplexing (WDM) technology.

With full digital diagnostics capabilities and robust thermal design, this transceiver ensures reliable operation in demanding environments.

 

Optical Characteristics (Over Recommended Operating Conditions)

Parameter	Symbol	Min	Typ	Max	Unit	Notes
Data Rate per Lane	-	-	25.78	-	Gbps	PRBS 231-1
Wavelength Range	λ	1295.56	-	1309.14	nm	4-channel LAN-WDM
Channel Spacing	Δλ	4.5	-	5.0	nm	-
Average Launch Power per Lane	PT	-6.0	-3.0	+0.5	dBm	Per lane, into SMF
Tx Power Balance Across Lanes	ΔPT	-	-	3.5	dB	Max difference
Receiver Sensitivity	PR	-	-	-10.5	dBm	Per lane, BER ≤ 5×10−5
Overload (Receiver)	Psat	-	-	-1.0	dBm	Per lane
Extinction Ratio	ER	3.5	-	-	dB	-
Optical Return Loss	ORL	26	-	-	dB	Tx port

Electrical & Mechanical Specifications

· Supply Voltage: 3.3V ±5%

· Power Consumption: <3.5W

· Input/Output Interface: 4x 25.78 Gbps electrical lanes (CAUI-4)

· Differential Impedance: 100 Ω

· Connector Type: Duplex LC

· Housing: Metal enclosure with EMI shielding

· Dimensions: 18.35 mm × 13.5 mm × 107.8 mm (W×H×L)

· Weight: ~38g

· Cooling: Passive air cooling required; minimum airflow recommended

 

Digital Diagnostics (DDM/DOM)

 

Supports real-time monitoring via I²C interface per SFF-8636 Rev 2.10a, including:

· Module temperature

· Supply voltage

· Laser bias currents (Tx1–Tx4)

· Transmitted optical power (per lane)

· Received optical power (total or per lane if supported by host)

· Alarm and warning flags (high/low thresholds)
Configurable thresholds and calibration data stored internally.

 

Compliance & Standards

· Standards: IEEE 802.3ba 100GBASE-LR4

· Form Factor: QSFP28 MSA

· Management Interface: SFF-8636 Rev 2.10a

· Laser Safety: IEC 60825-1:2014 / FDA CDRH Class 1

· Electrical Safety: IEC/EN/UL 62368-1

· Environmental: RoHS 6/6 compliant

· EMI: FCC Part 15 Subpart B, CISPR 32 Class A

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 Caution: Do not view fiber ports directly. Invisible laser radiation may be present when powered. Avoid eye exposure.