2.5G/1.25G CSFP

C-LIGHT independently developed 1.25G CSFP optical module supports a variety of transmission distances, including 2km, 15km, 40km, 80km and 120km, and can provide a transmission rate of up to 1.25Gb/s. Its communication protocol complies with 802.3z, Gigabit Ethernet 1000BASE-2BX10, the interface protocol complies with SFF-8472, and the encapsulation protocol complies with CSFP MSA option2. 1.25G SFP optical modules are widely used in network equipment interconnection, data centers and cloud computing, enterprise networks and campus networks, and industrial Ethernet. C-LIGHT has more than 15 years of rich experience in the field of optical communications, focusing on providing spot supply and customized services, and is committed to providing customers with high-quality optical module solutions. In addition, the 1.25G CSFP optical module is compatible with more than 100 brands of switches, and guarantees to provide original after-sales service to help customers effectively control costs.

3-year warranty Long term maintenance

Technical Support Professional free technical guidance

100% detection Each module is 100% tested

Spot stock Always in stock, short delivery time

Technical Support

Product Details

2.5G/1.25G CSFP Dual-Rate Optical Transceiver for High-Density Fiber Networks

Form Factor	Part No.	Fiber Type	Data Rate	Wavelength	Distance	Connector	Case Temperature	Note
CSFP	CLCSFP25BD141580D	SMF	2.5G	Tx1490nm/Rx1550nm	80km	Dual BIDl	Com./Ind.
CSFP	CLCSFP25BD151480D	SMF	2.5G	Tx1550nm/Rx1490nm	80km	Dual BIDI	Com./Ind.
CSFP	CLCSFP25BD131460D	SMF	2.5G	Tx1310nm/Rx1490nm	60km	Dual BIDI	Com./Ind.
CSFP	CLCSFP25BD141360D	SMF	2.5G	Tx1490nm/Rx1310nm	60km	Dual BIDI	Com./Ind.
CSFP	CLCSFP25BD131440D	SMF	2.5G	Tx1310nm/Rx1490nm	40km	Dual BIDl	Com./Ind.
CSFP	CLCSFP25BD141340D	SMF	2.5G	Tx1490nm/Rx1310nm	40km	Dual BIDI	Com./Ind.
CSFP	CLCSFP25BD131420D	SMF	2.5G	Tx1310nm/Rx1490nm	20km	Dual BIDI	Com./Ind.
CSFP	CLCSFP25BD141320D	SMF	2.5G	Tx1490nm/Rx1310nm	20km	Dual BIDI	Com./Ind.
CSFP	CLCSFPGEBD141580D	SMF	1.25G	Tx1490nm/Rx1550nm	80km	Dual BIDl	Com./Ind.
CSFP	CLCSFPGEBD151480D	SMF	1.25G	Tx1550nm/Rx1490nm	80km	Dual BIDI	Com./Ind.
CSFP	CLCSFPGEBD131460D	SMF	1.25G	Tx1310nm/Rx1490nm	60km	Dual BIDI	Com./Ind.
CSFP	CLCSFPGEBD141360D	SMF	1.25G	Tx1490nm/Rx1310nm	60km	Dual BIDI	Com./Ind.
CSFP	CLCSFPGEBD131440D	SMF	1.25G	Tx1310nm/Rx1490nm	40km	Dual BIDI	Com./Ind.
CSFP	CLCSFPGEBD141340D	SMF	1.25G	Tx1490nm/Rx1310nm	40km	Dual BIDI	Com./Ind.
CSFP	CLCSFPGEBD131540D	SMF	1.25G	Tx1310nm/Rx1550nm	40km	Dual BIDI	Com./Ind.
CSFP	CLCSFPGEBD151340D	SMF	1.25G	Tx1550nm/Rx1310nm	40km	Dual BIDI	Com./Ind.
CSFP	CLCSFPGEBD131420D	SMF	1.25G	Tx1310nm/Rx1490nm	20km	Dual BIDI	Com./Ind.
CSFP	CLCSFPGEBD141320D	SMF	1.25G	Tx1490nm/Rx1310nm	20km	Dual BIDI	Com./Ind.	Data Sheet
CSFP	CLCSFPGEBD131520D	SMF	1.25G	Tx1310nm/Rx1550nm	20km	Dual BIDI	Com./Ind.
CSFP	CLCSFPGEBD151320D	SMF	1.25G	Tx1550nm/Rx1310nm	20km	Dual BIDI	Com./Ind.

2.5G/1.25G CSFP Dual-Rate Optical Transceiver Overview

C-LIGHT 2.5G/1.25G CSFP optical transceivers are compact dual-channel optical modules designed for high-density fiber network deployments. Supporting both 1.25G and 2.5G configurations, the CSFP platform combines compact packaging with bidirectional optical transmission to help increase connectivity within limited equipment space.

The product family uses single-mode fiber and provides transmission options from 20km to 80km. Different Tx/Rx wavelength combinations, including 1310nm, 1490nm, and 1550nm, are used to create matched dual-BiDi configurations for different network distances and optical architectures.

2.5G/1.25G CSFP Dual-Rate Optical Transceiver Key Features

Dual-Rate Platform

The product family includes both 1.25G and 2.5G optical configurations, providing flexible options for different network equipment and access requirements.

CSFP Compact Form Factor

The CSFP design provides a compact optical solution intended for equipment requiring higher port density within a limited physical footprint.

Dual BiDi Architecture

The listed configurations use dual BiDi optical interfaces, enabling bidirectional transmission through wavelength-based optical channels.

20km to 80km Reach

The current product portfolio includes 20km, 40km, 60km, and 80km transmission configurations.

Multiple Wavelength Combinations

The modules use 1310nm, 1490nm, and 1550nm transmit and receive wavelength combinations according to the selected configuration.

Single-Mode Fiber

The listed 1.25G and 2.5G configurations are designed for single-mode fiber transmission.

Commercial and Industrial Options

The product specifications provide commercial and industrial case-temperature selections for different deployment environments.

High-Density Network Deployment

The compact CSFP platform is suitable for network equipment where increasing optical port density is an important consideration.

2.5G/1.25G CSFP Dual-Rate Optical Transceiver Applications

Access Network Equipment

CSFP modules can provide compact optical connectivity for access equipment where space and port density are important design considerations.

Network Equipment Interconnection

The modules can be used to establish optical links between compatible network devices across different fiber distances.

Data Center Connectivity

The compact form factor can support optical connectivity in equipment environments where rack and front-panel space need to be used efficiently.

Enterprise Networks

1.25G and 2.5G CSFP configurations provide flexible optical options for enterprise network infrastructure with different bandwidth requirements.

Campus Networks

Medium- and long-distance configurations can be deployed in campus environments where fiber links connect buildings or distributed network equipment.

Industrial Ethernet

The industrial-temperature options provide an alternative for compatible industrial networking equipment operating under wider environmental conditions.

High-Density Access Platforms

CSFP technology is particularly useful for platforms that need to increase subscriber or fiber connectivity without proportionally increasing equipment footprint.

Fiber Network Expansion

The combination of dual-rate operation and multiple optical reaches provides additional flexibility when expanding existing fiber infrastructure.

Why Choose C-LIGHT 2.5G/1.25G CSFP Dual-Rate Optical Transceiver?

Two-Speed Product Family

The same CSFP product platform covers 1.25G and 2.5G options, making it easier to select a suitable module for different network generations.

Compact High-Density Design

CSFP technology is designed around compact optical integration, making it suitable for equipment that needs to accommodate a high number of fiber connections.

Extended Optical Reach

20km, 40km, 60km, and 80km configurations provide coverage for medium- and long-distance single-mode fiber links.

Flexible Wavelength Pairing

Different combinations of 1310nm, 1490nm, and 1550nm wavelengths allow the transmit and receive channels to be matched for the selected optical link.

Multi-Vendor Compatibility

C-LIGHT states that its 1.25G CSFP optical modules are compatible with switches from more than 100 brands.

Quality-Controlled Manufacturing

C-LIGHT states that every module undergoes initial testing, final testing, and factory inspection as part of its three-step quality-control process.

Customized Optical Solutions

C-LIGHT provides customized solutions according to network requirements, optical specifications, equipment compatibility, and deployment conditions.

Long-Term Technical Support

C-LIGHT provides technical guidance, spot supply, compatibility support, after-sales service, and long-term maintenance for optical networking deployments.

2.5G/1.25G CSFP Dual-Rate Optical Transceiver FAQ

Q1. What is a 2.5G/1.25G CSFP optical transceiver?

A 2.5G/1.25G CSFP optical transceiver is a compact optical module family supporting 1.25G and 2.5G transmission configurations in a CSFP form factor, with dual-BiDi optical connectivity for compatible network equipment.

Q2. What data rates are available?

C-LIGHT currently lists both 1.25G and 2.5G configurations in the 2.5G/1.25G CSFP product family.

Q3. What transmission distances are available?

The current Product Details table includes 20km, 40km, 60km, and 80km configurations.

Q4. What fiber type does the CSFP use?

The listed configurations use single-mode fiber.

Q5. Which wavelengths are used?

The available configurations use 1310nm, 1490nm, and 1550nm transmit and receive wavelengths in different combinations.

Q6. What does Dual BiDi mean in the product specification?

Dual BiDi refers to the bidirectional optical configuration using separate transmit and receive wavelength channels within the CSFP module architecture.

Q7. Which protocols are supported?

According to the C-LIGHT product page, the communication protocol complies with 802.3z and Gigabit Ethernet 1000BASE-2BX10, the interface protocol complies with SFF-8472, and the encapsulation protocol complies with CSFP MSA Option 2.

Q8. Why use CSFP instead of a standard SFP?

CSFP is designed for compact, high-density optical deployments. Its dual-channel architecture can provide more optical connectivity within a similar equipment footprint, making it useful for access and high-density network platforms.

2.5G/1.25G CSFP Dual-Rate Optical Transceiver Solution Summary

C-LIGHT 2.5G/1.25G CSFP optical transceivers combine dual-rate capability, compact packaging, and dual-BiDi optical connectivity for high-density fiber networks. With 1.25G and 2.5G configurations, single-mode fiber support, multiple wavelength combinations, and transmission distances from 20km to 80km, the product family provides flexible options for access networks, enterprise infrastructure, data centers, campus networks, and industrial Ethernet applications.