• Silver-colored arista qdd-400g-zrp2 tunable coherent sfp+ transceiver modules with blue handles and metallic connectors
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Arista

Arista QDD-400G-ZRP2 | 400G ZR+ Tunable Coherent Transceiver, >120km, LC

QDD-400G-ZRP2

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Description

The Arista QDD-400G-ZRP2 is a 400GBASE-ZR+ QSFP-DD digital coherent tunable transceiver designed for high-capacity data center interconnect and metro networks. Featuring OpenZR+ compliance, it supports multiple modulation formats including 100G DP-QPSK, 200G DP-QPSK, 300G DP-8QAM, and 400G DP-16QAM for flexible deployment over distances exceeding 120km with optical amplification. This C-band tunable transceiver delivers carrier-grade reliability for regional DCI and long-haul IP-over-DWDM applications.

Features

OpenZR+ MSA 2.0 compliant for multi-vendor interoperability
- C-band tunable coherent DWDM transmission (ITU grid compatible)
- Multiple modulation formats: DP-QPSK, DP-8QAM, DP-16QAM for distance/capacity optimization
- Advanced O-FEC (OpenFEC) algorithm for superior error correction performance
- Configurable transmit parameters including modulation scheme, baud rate, and filter shaping
- 7nm coherent DSP ASIC technology for high integration and low power
- Ultra-narrow linewidth tunable laser assembly (ITLA) for high spectral purity
- High-responsivity coherent receiver with advanced detection
- Flexible line rates from 100G to 400G on a single transceiver
- Host interface flexibility: 1x 400GbE or 1-4x 100GbE configurable
- Hot-pluggable QSFP-DD form factor
- Real-time digital diagnostics monitoring (DDM) via CMIS interface
- No inline chromatic dispersion compensation required
- Suitable for IP-over-DWDM applications without external transponders
- Designed for regional DCI, metro aggregation, and long-haul backbone networks

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

Form Factor: QSFP-DD
- Data Rate: 100G / 200G / 300G / 400G (line side)
- Host Interface: 1x 400GbE or 4x 100GbE
- Wavelength: C-band tunable, 1528.77nm to 1567.13nm
- Connector: Duplex LC
- Fiber Type: Single-mode fiber (SMF)
- Transmission Distance: >120km (amplified), up to 450km at 400G (ZR+), up to 2000km at 100G (ZR+)
- Modulation Formats: 100G DP-QPSK, 200G DP-QPSK, 300G DP-8QAM, 400G DP-16QAM
- Baud Rate: ~60 GBaud
- FEC: O-FEC (high-performance forward error correction)
- Power Consumption: Typical 21W, Maximum 22.5W (at 400GbE mode)
- Digital Diagnostic Monitoring: DOM/DDM supported
- Operating Temperature: Commercial (0°C to 70°C)
- Standards Compliance: OpenZR+ MSA 2.0, OIF-400ZR-02.0, OIF-CMIS-05.2, OIF-C-CMIS-01.2, QSFP-DD Hardware Rev 6.3, IEEE 802.3-2018

FAQs

Q: What is the difference between ZR and ZR+ transceivers?
A: The QDD-400G-ZRP2 is a ZR+ transceiver that offers greater flexibility than standard ZR modules. While 400ZR supports up to 120km at 400G only, the ZR+ variant supports multiple modulation formats (QPSK, 8QAM, 16QAM) enabling operation at 100G, 200G, 300G, and 400G with extended distances up to 2000km at lower rates when amplified. ZR+ also features advanced O-FEC and configurable transmit parameters for optimized long-haul performance.

Q: Can this transceiver support both single 400G and breakout configurations?
A: Yes, the QDD-400G-ZRP2 supports flexible host configurations including a single 400GbE interface or 1-4x 100GbE interfaces. This allows the transceiver to adapt to different network architectures and enables backward compatibility with 100G infrastructure while supporting future 400G upgrades.

Q: What distances can this transceiver achieve at different data rates?
A: Distance capability depends on modulation format and amplification: at 400G using 16QAM it can reach >120km to 450km (amplified); at 300G using 8QAM up to 600km; at 200G using QPSK up to 1000km; and at 100G using QPSK up to 2000km. These extended ranges make it suitable for regional and long-haul DCI applications.

Q: Which Arista platforms support the QDD-400G-ZRP2?
A: Platform support for digital coherent optics is specific. Refer to Arista's 400ZR DCI Solution Data Sheet and Transceiver and Cable Guide for the complete list of compatible switches and routers. The QSFP-DD port may need to be configured for 2x 100G mode when using breakout configurations.

Q: Is this transceiver interoperable with other vendors' OpenZR+ modules?
A: Yes, the QDD-400G-ZRP2 is compliant with the OpenZR+ MSA 2.0 specification, which ensures multi-vendor interoperability. This allows it to interoperate with other OpenZR+ compliant transceivers and DWDM infrastructure for flexible DCI deployments across regional and metro networks.

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