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SEESUO ’s DWDM SFP is a series of optical transceiver modules operating at DWDM C-band (100GHz channel spacing) wavelengths over single-Mode Fiber (SMF). They are designed for use in Fast Ethernet, Gigabit Ethernet, 1G Fibre Channel, and SONET/SDH links, compliant with the SFP MSA. SEESUO supplies OEM service and Third-Party(Cisco, Juniper, HP, Dell etc.) compatible fiber optic transceivers.


● RoHS-6  compliant 

● Compliant with SFP MSA

● Compliant with  FC-PI 13.0 

● Compliant with IEEE Std 802.3

● Single +3.3V power supply

● Built-in digital diagnostic functions

● DWDM 100GHz ITU Grid C Band Available

● Transmission distance up to 120km over SMF

● Supports data rates from 100Mb/s to 1.25Gb/s

● Can be used with single fiber DWDM system or dual fiber DWDM system

● Operating Case Temperature: Standard: 0~70°C; Extended: -20~85°C; Industrial: -40~85°C


● Fast Ethernet

● Gigabit Ethernet

● 1X Fibre Channel




● DWDM Networks

1.25Gbps SFP Duplex WDM CWDM DWDM Transceiver Module Fully compatible with Cisco, HP, Alcatel, H3C, Huawei, Juniper, ZTE, Zyxel, D-Link, Extreme, Nortel, Netgear, Enterasys, Founfry, Adtran, Brocadem Marconi, Finisar etc. 

SEESUO  is one of the largest and best 1.25gbps sfp duplex wdm cwdm dwdm transceiver module manufacturers and suppliers with rich experience. Welcome to buy our high quality products or wholesale our customized 1.25gbps sfp duplex wdm cwdm dwdm transceiver module in stock with our factory.

The SFP transceivers are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA) and SFF-8472. The transceiver consists of five sections: the LD driver, the limiting amplifier, the digital diagnostic monitor, the DFB laser, and the PIN . The module data link up to 80KM in 9/125um single mode fiber. It offers a simple and convenient way to interface PCBs to single mode fiber optic cables in Dense Wavelength Division Multiplexing (DWDM) applications. It is a high performance, cost effective module for serial optical data communication applications.

The optical output can be disabled by a TTL logic high-level input of Tx Disable, and the system also can disable the module via I2C. Tx Fault is provided to indicate the degradation of the laser. Loss of signal (LOS) output is provided to indicate the loss of an input optical signal of the receiver or the link status with the partner. The system can also get the LOS (or Link)/Disable/Fault information via I2C register access.

Absolute Maximum Ratings

Parameter Symbol Min Max Unit
Supply Voltage Vcc -0.5 4 V
Storage Temperature Ts -40 +85 °C
Operating Humidity 5 85 %

Recommended Operating Conditions

Parameter Symbol Min Typical Max Unit
Operating Case Temperature Tc 0   +70 °C
Power Supply Voltage Vcc 3.13 3.3 3.47 V
Power Supply Current Icc     500 mA
Data Rate     1.25   Gbps
Fiber Length 9/125μm core SMF   80 km



What is compatible with 1.25 g SFP?

1.25G-SFP-20DI SFP Transceiver is fully compliant to SFP Multi Source Agreement INF-8074i. Consequently, it means that module is compatible with 80% of networking equipment, where is not implemented a special algorithm for protection against third party modules.

What is DWDM SFP?

Dense Wavelength Division Multiplexing (DWDM) Small Form-Factor Pluggable (SFP) transceiversprovide the high speeds and physical compactness that today's networks require while delivering the deployment flexibility and inventory control that network administrators demand.

What is the difference between CWDM and DWDM SFP?

Compared to DWDM, CWDM is easier to deploy and manage as it needs fewer optical hardware components. Additionally, CWDM uses wider wavelength spacing, which helps bring down costs. CWDM systems generally use 8, 16, or 32 channels, while DWDM systems can support up to 96 channels.

1.25G DWDM SFP transceiver supports up to 120km link lengths over single-mode fiber (SMF) via an LC duplex connector. Each SFP transceiver module is designed for single mode fiber and operates at a nominal wavelength of 100GHz or 50GHz ITU Grid, C Band DWDM wavelength. Featuring low power consumption, the hot swappable 1.25G SFP transceiver is ideal for Internet Service Provider (ISP) Gigabit Ethernet communication links, Enterprise LAN & SAN Networks, Data Center LAN & SAN Networks and other optical links. "If you need a large quantity of 1g dwdm sfp transceiver product - Mail us through our E-mail at sales@seesuo.com or request a quote at live chat and our sales manager will contact you shortly."
Product Model Rate Wavelength Distance Connector Cable Type DDM Frequency
SS-SFP1G-40D1XX-L 1.25G C17 1563.86nm~C61 1528.77nm 40km LC SMF With DDM 50Ghz
SS-SFP1G-80D1XX-L 1.25G C17 1563.86nm~C61 1528.77nm 80km LC SMF With DDM 50GHz
SS-SFP1G-120D1XX-L 1.25G C17 1563.86nm~C61 1528.77nm 120km LC SMF With DDM 50GHz
SS-SFP1G-40D2XX-L 1.25G C17 1563.86nm~C61 1528.77nm 40km LC SMF With DDM 100GHz
SS-SFP1G-80D2XX-L 1.25G C17 1563.86nm~C61 1528.77nm 80km LC SMF With DDM 100GHz
SS-SFP1G-120D2XX-L 1.25G C17 1563.86nm~C61 1528.77nm 120km LC SMF With DDM 100GHz
  • Up to 1.25Gbps
  • Wavelength selectable to C-band and L-band ITU-T grid wavelengths
  • Suitable for use in 50GHz/100GHz channel spacing DWDM systems
  • DWDM SFP MSA Compliant
  • Low Power Dissipation
  • Compatible with RoHS
  • Single 3.3V power supply
  • Operating case temperature: Standard:  0 to +70°C
  • Gigabit Ethernet
  • Fiber Channel
  • Metro/Access Networks
  • Switched backplane applications
  • Router/Server interface
  • Other optical transmission systems
  • 10 pcs Transceivers pack with one plastic box.
  • 4 plastic boxes pack with one antistatic bag.
  • OEM Manufacturer
    SEESUO supports OEM manufacturing by producing products according to the designs and specifications provided by the client. We strictly adhere to commercial confidentiality principles to protect the client's brand and privacy.
  • ODM Manufacturer
    SEESUO has extensive research and development experience and high-quality production management capabilities. We can develop and manufacture products specifically for our clients' brands according to their needs.
  • Customized production
    SEESUO offers highly customized product research and development and manufacturing services with a flexible production model. We are able to meet the small-batch customized production needs of some high-end clients.
  • R&D cooperation
    SEESUO is capable of adapting to the rapidly changing market demands and can collaborate with customers in research and development. We invest resources in R&D to meet customers' specialized requirements and build a strong brand moat.
  • function testing
  • compatibility testing
  • industrial production line
  • adaptive testing
  • data rate testing
  • final inspection
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