Cisco Compatible QSFP-40G-ER4 | 40GBASE-ER4 QSFP+ Transceiver LC SMF 40km

Cisco Compatible QSFP-40G-ER4 40GBASE-ER4 QSFP+ Optical Transceiver (LC Duplex, 1310nm, 40km)

Product Overview

The Cisco compatible QSFP-40G-ER4 optical transceiver is a high-performance 40Gbps module designed for extended-range transmission over single-mode fiber (SMF). Utilizing LAN-WDM technology, it multiplexes four optical lanes into a single duplex fiber pair, enabling efficient high-speed communication over long distances.

Operating in the 1310nm wavelength range, this module supports transmission distances up to 40 kilometers, making it ideal for telecom backbone networks, metro infrastructure, and long-distance data center interconnect (DCI) applications.

Key Features

Supports aggregate data rate of 40Gbps (4 × 10Gbps lanes)

LAN-WDM technology (4 wavelengths multiplexed)

Transmission distance up to 40km over SMF

LC Duplex connector

Fully compliant with QSFP+ MSA and IEEE 802.3ba 40GBASE-ER4

Hot-pluggable QSFP+ form factor

Built-in Digital Diagnostic Monitoring (DDM/DOM)

High-performance optical design for long-haul transmission

Low power consumption (<4.5W)

100% compatible with Cisco platforms (custom coding available)

RoHS compliant and Class 1 laser safety certified

Technical Specifications

Parameter	Specification
Form Factor	QSFP+
Data Rate	40Gbps (4 × 10Gbps)
Wavelength	LAN-WDM (~1270–1330nm)
Fiber Type	Single-Mode Fiber (SMF)
Max Distance	40km
Connector	LC Duplex
Transmitter Type	DFB Laser (WDM)
Receiver Type	APD Photodiode
Lane Configuration	4 Tx / 4 Rx
Output Power	-2 ~ +5 dBm
Receiver Sensitivity	≤ -20 dBm
Extinction Ratio	> 4 dB
Power Consumption	< 4.5W
Operating Temperature	0°C to 70°C (Commercial)
Storage Temperature	-40°C to 85°C
Protocols Supported	IEEE 802.3ba, QSFP+ MSA
Digital Diagnostics	Yes (DDM/DOM Supported)

Applications

Long-distance 40G Ethernet transmission

Telecom backbone and metro networks

Data center interconnect (DCI) over extended distances

Enterprise WAN connectivity

High-capacity switch and router uplinks

Carrier-grade optical infrastructure

Compatibility

This module is fully compatible with Cisco switches and routers and can be custom-coded for other major networking platforms such as Huawei, Juniper, HPE, Arista, and more.

Why Choose This QSFP-40G-ER4 Module?

Enables 40G transmission up to 40km over SMF

Efficient WDM technology for high-speed long-distance links

Cost-effective alternative to original Cisco optics

Fully tested for compatibility and reliability

OEM/ODM support including labeling and coding customization

Reliable supply for telecom and enterprise deployments

Ordering Information

Part Number	Description
QSFP-40G-ER4-C	40GBASE-ER4 QSFP+ Transceiver, LC, SMF, 40km

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