FS 100G Single Lambda Transceivers Recommendation

Updated on Aug 12, 2022


100G single lambda transceiver applies PAM4 modulation to transmit 100G data over a single wavelength. The optics are winning more popularities as they enable operators to migrate to 400G in an easy way. So FS introduces three types of 100G single lambda transceivers, 100GBASE-DR QSFP28, 100GBASE-FR QSFP28, 100GBASE-LR QSFP28.

Features and Spcifications

FS generic 100G-DR / FR / LR transceiver modules include a gearbox chip to convert the 4 x 25G NRZ electrical signals to a 1 x 100G PAM-4 optical signal. The transmission distance can reach up to 10km over duplex LC single mode fiber cables. They are designed with COB (chip on board) packaging. Functions like host FEC and EMC (Electro Magnetic Compatibility) can be supported. The following table shows more specific features of these FS QSFP28 transceivers.

Part Number QSFP28-DR-100G QSFP28-FR-100G QSFP28-LR-100G
Wavelength 1310nm 1310nm 1310nm
Max Cable Distance 500m 2km 10km
Transmitter Type EML EML EML
Receiver Type PIN PIN PIN
DDM/DOM Supported Supported Supported
Commercial Temperature Range 0 to 70°C (32 to 158°F) 0 to 70°C (32 to 158°F) 0 to 70°C (32 to 158°F)
TX Power -2.9~4dBm -2.4~4dBm -1.4~4.5dBm
Receiver Sensitivity <-5.9dBm <-6.4dBm <-7.7dBm
Powerbudget 3dB 4dB 6.3dB
Power Consumption 4.5W ≤4.5W ≤4.5W
Extinction Ratio 3.5dB >3.5dB >3.5dB
CDR (Clock and Data Recovery) TX & RX Built-in CDR TX & RX Built-in CDR TX & RX Built-in CDR
Transmit and Dispersion Penalty 3.4dB 3.4dB 3.4dB
Protocols IEEE 802.3cd 100GBASE-DR Specification compliant 100G Lambda MSA 100G-FR Specification compliant 100G Lambda MSA 100G-LR Specification compliant


QSFP28-DR-100G single lambda optical transceiver supports up to 500m, which is suitable for the data center leaf-spine connectivity where the fiber length seldom exceeds 100m. It also enables the migration from 100G to 400G.

Figure1: QSFP28-DR-100G solution



QSFP28-FR-100G has the same reach of 2km over duplex SMF and uses duplex LC connectors with 100G CWDM4 transceiver. It's very popular in data centers. Because it has the same reach, fiber, and connector as 100G CWDM4, it can be used in the applications that 100G CWDM4 module is used, such as high-performance computing networks, enterprise core and distribution layer applications. By the way, QSFP28-FR-100G also allows you to upgrade to 400G with 400GBASE-XDR4 QSFP-DD module and MTP-LC breakout cable.

Figure2: QSFP28-FR-100G solution


QSFP28-LR-100G, with the max reach of 10km distance, can be used to connect different buildings that may not even be in the same city. So it's a good choice for campus networks building.


FS 100G Single lambda Modules Help Seamless Migration to 400G

The main differences among FS 100G-DR / FR / LR transceiver modules are tx power, receiver sensitivity, powerbudget, transmission distance which is the biggest difference. Different distances may be used in different environments. From the above comparison, I hope it would be helpful for you to make a wise decision when choosing these FS QSFP28 optics.

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