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SFP+/QSFP

SFP vs QSFP
SFP QSFP
SFP (Small Form-factor Pluggable) transceiver utilizes a single channel to transmit and receive data A QSFP (Quad Small Form-factor Pluggable) combines four channels into one module to achieve four times the bandwidth.
SFP (1 Lane): Features a small footprint with a single lane for transmitting (Tx) and receiving (Rx). It traditionally uses LC duplex or SC simplex connectors. QSFP (4 Lanes): Features a wider footprint. It houses four independent transmit and four independent receive channels. It typically uses high-density MPO/MTP connectors (for parallel optics) or an internal multiplexer over LC duplex (for Wavelength Division Multiplexing).
Form Factor Primary Data Rates Common Standard / Types Typical Use Cases
SFP 1 Gbps 1G SFP Legacy enterprise links
SFP+ 10 Gbps 10G SFP+ Modern enterprise cores
SFP28 25 Gbps 25G SFP28 5G FTTA / Data centers
SFP56 50 Gbps 50G SFP56 Mid-haul wireless, specialized compute
QSFP+ 40 Gbps (4 x 10G) 40G Base-SR4 / LR4 Enterprise distribution layers
QSFP28 100 Gbps (4 x 25G) 100G Base-SR4 / LR4 Data center leaf-spine fabrics
QSFP56 200 Gbps (4 x 50G) 200G FR4 / DR4 AI clusters and cloud infrastructure
Cisco Compatible 100GBASE-SR4 QSFP28 850nm 100m DOM MPO-12/UPC MMF Optical Transceiver Module, Breakout to 4 x 25G-SR with DDM

Cisco Compatible 100GBASE-SR4 QSFP28 850nm 100m DOM MPO-12/UPC MMF Optical Transceiver Module, Breakout to 4 x 25G-SR with DDM

Up to 27.952 Gbps Data rate per channel

Maximum link length of 150m links on OM4 multimode fiber

High Reliability 850nm VCSEL technology

Electrically hot-pluggable

Digital diagnostic SFF-8636 compliant

Compliant with QSFP28 MSA

Case operating temperature range:0°C to 70°C

Power dissipation < 2.0W
KCO QSFP56 200G FR4 S SMF 2km DLC QSFP56 Optical Fiber Transceiver 200G-FR4H OSFP SMF Duplex LC 2km

KCO QSFP56 200G FR4 S SMF 2km DLC QSFP56 Optical Fiber Transceiver 200G-FR4H OSFP SMF Duplex LC 2km

- Up to 50Gbps data rate per channel by PAM4 modulation

- 4 duplex channels transmitters and receivers

- Integrated CWDM LD and PD array

- Duplex LC/UPC connecting interface compliant

- Single +3.3V power supply 6, DDM function implemented

- Hot-pluggable QSFP56 form factor

- Maximum link length of 2km via SMF fiber

- Low power dissipation:<6.5W

- International class 1 laser safety certified

- Operating temperature range: 0℃ ~ +70℃

- Compliant with ROHS
KCO QSFP56 200G LR4 S SMF 1310nm 10km DOM DLC 200GBASE-LR4 QSFP56 1310nm 10km DOM Duplex LC SMF Fiber Optic Transceivers

KCO QSFP56 200G LR4 S SMF 1310nm 10km DOM DLC 200GBASE-LR4 QSFP56 1310nm 10km DOM Duplex LC SMF Fiber Optic Transceivers

- 200GBASE-LR4 compliant, 4x 26.5625 GBd PAM4

- 200GAUI-4 compliant, 4x 26.5625 GBd PAM4

- Hot-pluggable QSFP56 form factor

- QSFP+ 28 Gb/s compliant

- Maximum link length of 10km via SMF

- Duplex LC connector

- Low power dissipation: <8.0W

- Operating temperature range: 0 to 70ºC
KCO QSFP56 200G SR4 S MMF MPO-12 100m 200Gbps QSFP56 OSFP Multimode 100m MTP MPO Fiber Optic Transceiver

KCO QSFP56 200G SR4 S MMF MPO-12 100m 200Gbps QSFP56 OSFP Multimode 100m MTP MPO Fiber Optic Transceiver

- Hot Pluggable QSFP56 Transceiver

- Supports 212,5Gbps aggregate bit rate

- Up to 53.125Gbps data rate per channel

- SFF-8665 compliant QSFP56 port;

- SFF-8636 compliant I2C management

- Compliant with IEEE802.3cd 200GBASE-SR4

- MPO-12 connector receptacle with UPC end-face

- Maximum link length of 100m on OM4 MMF

- Single 3.3V Power Supply

- Low power dissipation (<4.5W)

- Operating case temperature range:0°C to 70 °C

- RoHS compliant
KCO-QDD-400G-SR8-S MMF 850nm 100m DOM MPO-16/APC

KCO-QDD-400G-SR8-S MMF 850nm 100m DOM MPO-16/APC

Compatible 400GBASE-SR8 QSFP-DD Optical Transceiver Module Breakout to 2 × 200G-SR4 and 8 × 50G-S

- Hot pluggable QSFP-DD form factor

- Supports 400Gb/s aggregate bit rate

- Up to 53.125Gbps data rate per channel

- Maximum link length of 70m on OM3 and 100m on OM4

- MPO connector receptacle

- Case temperature range: 0 ~ +70℃

- Power dissipation: <10W

- Single 3.3V power supply

- Compatibility Validated in Arista/NVIDIA/Cisco RoCE Networking

- High Bandwidth

- Low Latency

- Compliant to QSFP-DD MSA

- Compliant with IEEE 802.3cd

- RoHS complaint
KCO QDD 400G FR S 4*100G PAM4 SMF 1310nm 2KM MPO-12 QDD-4x100G-FR-S

KCO QDD 400G FR S 4*100G PAM4 SMF 1310nm 2KM MPO-12 QDD-4x100G-FR-S

Compatible 400GBASE-FR QSFP-DD 4*100G PAM4 Optical Transceiver Module 1310nm 2Km DOM MPO-12/APC Fiber Optic Equipment

- QSFP-DD MSA compliant

- MPO-12 connector with 8° angled end-face

- Power consumption <11 W

- Operating case temperature 0 to 70 ºC

- CMIS 4.0 management interface

- Breakout Mode • 4x 100GBASE-FR1 compliant 53.125GBd PAM4 • 100GAUI-2 compliant 2x 26.5625 GBd PAM4

- Aggregation Mode • 400GBASE-FR4 compliant 4x 53.125GBd PAM4 • 400GAUI-8 compliant 8x 26.5625 GBd PAM4
KCO-QDD-400G-DR4 400GBASE-DR4 QSFP-DD PAM4 1310nm 500m DOM MPO-12/APC SMF Optical Transceiver Module, Breakout to 4 x 100G-DR

KCO-QDD-400G-DR4 400GBASE-DR4 QSFP-DD PAM4 1310nm 500m DOM MPO-12/APC SMF Optical Transceiver Module, Breakout to 4 x 100G-DR

- Compliant with QSFP-DD MSA

- Four Parallel 1310nm Optical Lanes

- IEEE 802.3bs 400GBASE-DR4 Specification Compliant

- Compliant with RoHS Requirement

- Up to 500m Transmission on SMF with FEC

- 8×53. 125Gb/s Electrical Interface (400GAUI-8)

- Data Rate 4* 106.25Gbps (PAM4) Optical Interface

- Case Temperature Range: 0 to 70。C

- Maximum Power Consumption 10W

- MPO-12 Connector

- Built-in Digital Diagnostic Functions
KCO-QDD-400G-LR4-S 400GBASE-LR4 QSFP-DD PAM4 1310nm 10km DOM Duplex LC/UPC SMF Optical Transceiver Module

KCO-QDD-400G-LR4-S 400GBASE-LR4 QSFP-DD PAM4 1310nm 10km DOM Duplex LC/UPC SMF Optical Transceiver Module

- Compliant to QSFP-DD MSA

- 4 CWDM lanes MUX/DEMUX design

- Duplex LC connector

- Up to 10km transmission on single mode fiber (SMF) with FEC

- 8×53.125Gb/s electrical interface (400GAUI- 8)

- Data Rate 106.25Gbps (PAM4) per channel

- Case temperature range: 0 ~ +70℃

- Maximum power consumption 9W

- RoHS complaint
400GBASE-SR4.2 QSFP-DD PAM4 850nm 100m DOM MPO-12/UPC MMF Optical Transceiver Module, Breakout to 4 x 100G-SR1.2

400GBASE-SR4.2 QSFP-DD PAM4 850nm 100m DOM MPO-12/UPC MMF Optical Transceiver Module, Breakout to 4 x 100G-SR1.2

- QSFP-DD MSA

- 8x 53.125Gb/s Electrical Interface(400GAUI-8) Compliant

- Up to 150m OM5 MMF transmission

- MPO-12 Optical Connector

- RoHS Compliant

- Single 3.3 V Power Supply

- Maximum Power Consumption 12W

- Operating Case Temperature: 0°C to 70°C
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The usage of SFP and QSFP on FTTH and FTTA Solution

 Design Metric  FTTH (Fiber-to-the-Home)  FTTA (Fiber-to-the-Antenna)
 Edge Module (SFP)  GPON / XGS-PON SFP (Simplex SC)  25G SFP28 eCPRI (Duplex or BiDi LC)
 Core Module (QSFP)  QSFP28 / QSFP-DD Network Uplinks  QSFP28 Port-to-SFP28 Radio Breakouts
 Primary Protocol  Ethernet / ATM Layering  CPRI (4G) / eCPRI (5G Packetized)
 Temp Requirement  Commercial (0°C to 70°C) inside CO  Industrial (-40°C to 85°C) up the mast
 Usage [ Central Office OLT ] ===( QSFP Uplink )===> [ Core Switch ]
|
( PON SFP )
|
[ Passive Splitter ] ——> [ Home ONT / ONU ]		  [ BBU Hub / DU ] ===( QSFP28 Breakout )===> [ 4x SFP28 Tower Ports ]
||
( Vertical Trunk )
||
[ 25G SFP28 RRU ]
 FTTH networks rely heavily on Passive Optical Network (PON) topologies to distribute internet from a Central Office (CO) to individual homes  The SFP28 (25G) Standard: Modern 5G Macro cells run on 25G SFP28 transceivers built specifically for eCPRI (Enhanced Common Public Radio Interface) protocols.
 OLT Side: Optical Line Terminal (OLT) chassis use specialized PON SFP modules (GPON, XGS-PON, or 25G-PON). These are unique because they are BiDi (Bidirectional) simplex SFPs—using a single SC connector to transmit on one wavelength (e.g., 1490nm) and receive on another (e.g., 1310nm) to serve up to 32 or 64 homes over one fiber strand.  Industrial Hardening: SFTs deployed up the tower must be Industrial Temperature rated (-40°C to 85°C) to survive extreme seasonal weather. They are integrated into ruggedized outdoor housings like FullAXS or ODVA before being plugged directly into the Remote Radio Unit (RRU)
 ONT/ONU Side: The client-side optical network terminal inside the home or business often utilizes standard 1G SFP or 10G SFP+ modules plugged into a residential gateway.  BiDi & CWDM: To save weight and fiber resources on the tower asset, technicians frequently use BiDi SFP28 or CWDM SFP28 modules, allowing multiple frequency bands to share fewer glass strands.
 QSFP Usage (The Central Office Core: Home users do not use QSFP modules. Instead, QSFP28 (100G) or QSFP-DD (400G/800G) transceivers are used inside the Central Office. They aggregate the massive combined traffic coming from dozens of PON SFP line cards and route it upstream out to the broader internet core.  Breakout Deployments: Instead of running 24 individual SFP cables, a high-density baseband router will utilize QSFP28 (100G) ports in breakout mode. A single QSFP28 port maps out to a 1-to-4 breakout MPO trunk cable, efficiently delivering four independent 25G eCPRI channels straight up to four separate tower radios.

Process
Process
Process
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