100GBASE-FR1 Application Overview


100GBASE-DR, 100GBASE-FR1, 100GBASE-LR1, 100BASE-LR4, 100BASE-ZR, and 100BASE-ER4
100GBASE-FR1: 100 Gb/s PAM4 serial transmission at 1310 nm over 2 single‑mode optical fibers, with reach up to at least 2 km

100GBASE-FR1 supports long wavelength 4‑level pulse amplitude modulated (PAM4) serial transmission over duplex (2‑fiber) single-mode optical fiber cabling. The application’s equivalent symbol rate is 106.25 GBd per lane (PAM4 maps pairs of bits into a single symbol) and the supported distance varies according to the type of single‑mode cable used. Network equipment interface connections include a duplex optical fiber connector and a standard socket into which physical (PHY) layer transceiver modules may be plugged.

  • Connector type: LC
  • Transceiver module: QSFP28
  • Defined in clause 140 of the IEEE 802.3 Standard for Ethernet
  • Initially published as IEEE Std 802.3cu™: Physical Layers and Management Parameters for 100 Gb/s and 400 Gb/s Operation over Single‑Mode Fiber at 100 Gb/s per Wavelength in 2021

Optical Fiber Cabling (Channel) Characteristics:

Parameter OS1a Indoor/Outdoor OS2
Operating wavelength: 1310 nm
Insertion loss (max): 4.0 dB
Cabled fiber attenuation (max): 1.0 dB/km 0.5 dB/km 0.4 dB/km
Operating range2: 2 m to 1 km1 2 m to 2 km 2 m to 2 km
1 Operating range for cabled fibers having more than 0.5 dB/km attenuation is not specified by IEEE 802.3. This calculation is provided for information only.
2 Maximum operating ranges are calculated using a 3.0 dB connection and splice loss allocation.

Key Application Capabilities:

  • Defines a 100 Gb/s PHY for operation over at least 2 km of SMF
  • Supports full-duplex operation only
  • Preserves the Ethernet frame format utilizing the Ethernet MAC
  • Preserves minimum and maximum FrameSize of current 802.3 Standard for Ethernet
  • Provides appropriate support for optical transport networks (OTNs)
  • Supports a BER of better than or equal to 10-12 at the MAC/PLS service interface (or the frame loss ratio equivalent)

Related Applications:

The IEEE P802.3cu Task Force also specified the following 100 Gb/s per wavelength Ethernet applications:

Application    Operating    Wavelength Media Operating Range1
100GBASE-LR1 1310 nm Single-mode up to 10 km
400GBASE-FR4 1310 nm Single-mode up to 2 km
400GBASE-LR4-6 1310 nm Single-mode up to 6 km
1 Supported distance varies according to the type of optical fiber cable used.

Back to TIA FOTC IEEE 802.3 Single-mode Optical Fiber Ethernet Standards Explorer