The 100G QSFP28 ER transceiver is built for long-haul 100G connections where standard LR4 (10km) falls short. It complies with the 100G 4WDM‑40 MSA and IEEE 802.3‑2018 (CAUI‑4 electrical interface), making it a drop‑in solution for 40km links over standard single‑mode fiber. Below is a breakdown of what makes this module a solid choice for metro networks, campus backbones, and data center interconnects.

Features

Compliant with QSFP28 Standard:
SFF-8661 Revision 1.9, SFF-8636 Revision 2.10a
Compliant with 100G 4WDM-40 MSA technical specification rev 1.0
High speed I/O electrical interface (CAUI-4) compliant with IEEE 802.3-2018
Single 3.3V Supply Voltage
Maximum power consumption 4.5W
0-70 ºC Case Operating Temperature
LAN WDM EML laser and APD Receiver Array
QSFP28 MSA package with duplex LC connector
Two Wire Serial Interface with Digital Diagnostic Monitoring
Complies with EU Directive 2011/65/EU (RoHS compliant)
Class 1 Laser

Why Choose Our 100G QSFP28 ER?

When you need to connect two sites 30‑40km apart – such as a data centre to a disaster recovery facility or a metro ring aggregation point – the 100G QSFP28 ER eliminates the cost and complexity of external optical amplifiers. Its APD receiver provides ample margin even over older fiber plants with higher loss. For shorter links, our LR4 or CWDM4 modules may be more cost‑effective. But for true extended reach, this 100G QSFP28 ER delivers reliable, standards‑based performance.

FAQ

Q1: What is the actual maximum distance of this ER4 module? Is it 30km or 40km?

A1: The module is designed for 40km reach. Some vendors offer an "ER4 Lite" version for 30km with lower power consumption. Our standard ER4 fully supports 40km on standard single‑mode fiber. Check the part number or datasheet – if it says "40km", you can rely on that distance with sufficient link budget.

Q2: How does the APD receiver help compared to a normal PIN receiver?

A2: An APD (avalanche photodiode) internally amplifies the weak optical signal before it reaches the transimpedance amplifier. This gives much higher sensitivity. That extra sensitivity is what allows the module to work over 40km without needing an external optical amplifier.

Q3: Do you offer pre‑sales compatibility testing for specific switches?

A3: Yes. We can provide sample modules for you to test with your switch model and firmware version. We also maintain a compatibility list covering major brands. If your switch is not listed, send us the details – we can often provide a matching coded module.

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