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Why 100G QSFP28 ER4 Lite DML Is Suitable for DCI Network?

The form factor of 100G optical transceivers constantly upgrade toward smaller size, the requirement for power consumption is lower, while the lower cost is a relentless pursuit of the industry.

In general, there are form factors such as CFP/CFP2/CFP4 and QSFP28 for 100G optical transceivers. Among them, the QSFP28 is the dominant 100G form factor. This post will introduce the 100G QSFP28 ER4 Lite for DCI to us.

The Evolution of the 100G Form Factor

Why 100G QSFP28 ER4 Lite DML Is Suitable for DCI Network?

100G QSFP28 ER4 Lite is compliant to QSFP MSA, IEEE 802.3ba 100GBASE-ER4 Lite and OTU4. IEEE 802.3ba defines that the 100GBASE-ER4 series have a BER requirement of better than 1E-12 w/o FEC for optical modules. Since the receiver sensitivity of 100GBASE-ER is not satisfied with the existing APD technology, the SOA size is too large for the QSFP28 series. Some providers in the industry of optical transceiver defined a non-standard 100GBASE-ER4 Lite with QSFP28 package that the largest transmission distance is up to 30km without FEC. The receiver sensitivity of 100GBASE-ER4 Lite 30km has no clear definition in IEEE802.3ba. The average of OMA sensitivity is around -17dBm(BER 1E-12@25.78125G bps) based on the current level of 100G APD ROSA.

Why 100G QSFP28 ER4 Lite DML Is Suitable for DCI Network?

The Gigalight 100G QSFP28 ER4 Lite DML 40km optical transceiver is designed for 100G Ethernet 100GBASE-ER4. It meets the 100GE 4WDM-40 MSA standard. The receiver adopts APD optical detector with high sensitivity, and its sensitivity is less than -16.5dBm. The high-performance cooled LAN-WDM DFB transmitters and high-sensitivity APD receivers provide superior performance for 100 Gigabit Ethernet applications up to 30km links without FEC and up to 40km links with FEC.

The 100G QSFP28 ER4 Lite optical transceiver for DCI network of data centers provides a convenient choice for long-distance interconnection between data centers with 100G ports. It is an economical solution for DCI optical interconnection between distributed data centers.

Why 100G QSFP28 ER4 Lite DML Is Suitable for DCI Network?

Features of 100G QSFP28 ER4 Lite

  • Hot-pluggable QSFP28 form-factor
  • 4 channels full-duplex transceiver module
  • Transmitter: 4x cooled LAN-WDM DFB
  • Receiver: 4x25Gb/s APD ROSA
  • Internal CDR circuits on both receiver and transmitter channels
  • Compliant with QSFP MSA, IEEE 802.3ba 100GBASE-ER4 Lite and OTU4
  • Data rate up to 112Gbps
  • Reach up to 30km (FEC-disabled) or 40km (FEC-enabled) over G.652 SMF
  • Low power consumption < 3.8W
  • Duplex LC receptacles
  • Operating case temperature range 0°C to 70°C
  • 3.3V power supply voltage
  • RoHS compliant (lead-free)


Gigalight owns professional product research and development and professional supply chain management team. The 100G QSFP28 series were provided by Gigalight, which has not only a good quality certificate but also the price is more affordable, which is recognized as a cost-effective product.

This is an original article wrote by Lafite. If reproduced, please indicate the source: https://www.gigalight.com/community/why-100g-qsfp28-er4-lite-dml-is-suitable-for-dci-network/

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