100GBASE-LR1 Application Overview


100GBASE-DR, 100GBASE-FR1, 100GBASE-LR1, 100BASE-LR4, 100BASE-ZR, and 100BASE-ER4
100GBASE-LR1: 100 Gb/s PAM4 serial transmission at 1310 nm over 2 single‑mode optical fibers, with reach up to at least 10 km

100GBASE-LR1 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): 6.3 dB
Cabled fiber attenuation (max): 1.0 dB/km 0.5 dB/km 0.4 dB/km
Operating range2: 2 m to 4 km1 2 m to 8 km1 2 m to 10 km
1 Operating range for cabled fibers having other than 0.4 dB/km attenuation is not specified by IEEE 802.3. These calculations are provided for information only.
2 Maximum operating ranges are calculated using a 2.0 dB connection and splice loss allocation.

Key Application Capabilities:

  • Defines a 100 Gb/s PHY for operation over at least 10 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-FR1 1310 nm Single-mode up to 2 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