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400ZR and 400G OpenZR+

Overview

The 400ZR is an Optical Interworking Forum (OIF) standard for transporting 400GbE over long distances through fiber-optic patch cables. The standard defines the solution to transport 400GbE optical signals using a single wavelength.

The primary application of 400ZR optics is to interconnect data centers within a distance of up to 120 km. Data centers require high bandwidth, high speed, and low latency networks. The 400ZR optical module meets these requirements.

400G OpenZR+ (model numbers: QDD-400-ZR-M, JCO400-QDD-ZR-M, QDD-400G-ZR-M-HP, and JCO400-QDD-ZR-M-HP) is an extension of 400ZR specifications to improve performance and adheres to OpenZR+ MSA standard.

Some characteristics of the 400ZR and 400G OpenZR+ optics are:

  • Configuration of different speeds and negotiation between capacity and reach. For example, on the QDD-400G-ZR-M and JCO400-QDD-ZR-M transceivers, 400 Gbps can support a nominal reach of 500 km, 300 Gbps up to 900 km, and 200 Gbps up to 2000 km. Exact reach depends on an optical line system that is in use (400G OpenZR+ optics only).
  • Capacity to carry the signals across long distances through fiber-optic patch cables with periodic optical amplification.
  • Fully C-band tunable and dense wavelength-division multiplexing. We support 75-GHz and 100-GHz channel spacings.
  • Ability to operate in amplified and unamplified modes.
  • Support for 400 Gbps speed. You can use the port as one 400GbE interface or channelize it to operate from one up to four 100GbE interfaces.

Transceiver Specifications

Form Factor

Juniper's coherent 400G transceivers make use of the QSFP56-DD form factor (commonly referred as QSFP-DD). For more information on the QSFP-DD form factor, see QSFP-DD.

Juniper 400ZR and 400G OpenZR+ Transceivers

For a list of all 400G optics and their supported platforms for 400ZR and 400G OpenZR+, see Hardware Compatibility Tool.

Connector Types

Juniper’s coherent 400G transceivers support Duplex LC PC/UPC connector type. For more information, see Connector Types.

Patch Cable Type and Length

Juniper’s 400G coherent optics utilize SMF to achieve extended reach across high-density optical links. For information on compatible fiber media and patch cable lengths, see Patch Cable and Length.

Breakout Capabilities

Juniper's coherent 400G transceivers operate over single-mode fiber (SMF) using duplex optical connectors (commonly LC). Unlike conventional Ethernet optics that rely on multiple parallel optical lanes and support physical breakout cables, coherent modules transmit traffic on a single modulated optical wavelength.

These optics provide muxponder-like functionality by mapping client traffic into a single coherent carrier and support software-selectable operating rates (such as 100 GbE, 200 GbE, or 400 GbE). The selected mode adjusts parameters such as modulation format and forward error correction to optimize link reach and meet optical signal-to-noise ratio (OSNR) requirements.

Because the transmission uses a single coherent wavelength, the optical signal cannot be physically split into multiple interfaces using breakout cables. Any separation of transported Ethernet traffic occurs only after coherent demodulation at the receiving system. The receiving platform may then map the received client traffic to logical interfaces or, depending on platform capabilities, to separate physical Ethernet interfaces.

The 400G OpenZR+ coherent transceivers support the following rate selections:

  • 1 x 100GbE

  • 2 x 100GbE

  • 3 x 100GbE

  • 4 x 100GbE

  • 1 x 400GbE

Licensing

You need a Juniper Coherent Optics or Third-party Coherent Optics Software License to use the 400ZR and 400G OpenZR+ coherent DWDM transceivers on Juniper devices. For information about the licensing model for the coherent 400ZR and 400G OpenZR+ optics, see Software Licenses for Juniper Coherent Optics. For additional information about License management, see Licensing Guide. You can also contact your Juniper Account Team or Juniper Partner.