400G QSFP-DD Multirate Coherent Tunable DWDM ZR+ with dual CDR 480 km*, C-Band, LC-Duplex, Singlemode

Universal Multirate coherent tunable QSFP-DD Transceiver
Compliant to OpenZR+ MSA
Use FLEXBOX in combination with FLEXSOX to configure to almost any vendor
For 400GBASE-ZR+ Ethernet links
Integrated Clock-Data-Recovery (CDR)
DP-16QAM modulated signal
Supports multirate 100G/200G/300G/400G
Tx & Rx wavelength required to be the same (one local oscillator)
Supported Data Rates: 425 Gbit/s
Up to 480 km via Singlemode OS2
LC-Duplex Connector
  • Coherent DWDM
  • 480 km
  • 425 G
  • equalizer Tunable
  • 100G ETH
  • 200G ETH
  • 300G ETH
  • 400G ETH
  • 4x 100G ETH
Part number
4-6 weeks after ordering

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Line Rate Power Dissipation Tx Power Rx Input OSNR Chromatic Dispersion PMD Baud Rate FEC Modulation MSA format
400G 23 W -10 ~ -6 dBm -12 dBm 24 dB/0.1nm 20.000 ps/nm 20 ps 60.1385468 Gbd oFEC DP-16QAM OpenZR+ MSA
300G 23 W -10 ~ -6 dBm -15 dBm 21  dB/0.1nm 40.000 ps/nm 25 ps 60.1385468 Gbd oFEC DP-8QAM  
200G 22 W -9 ~ -5 dBm -18 dBm 16 dB/0.1nm 50.000 ps/nm 25 ps 60.1385468 Gbd oFEC DP-QPSK  
100G 16 W -8 ~ -4 dBm -18 dBm 12.5 dB/0.1nm 100.000 ps/nm 30 ps 30.069273 GBd oFEC DP-QPSK  


Form Factor QSFP-DD
Connector / Polish LC-Duplex PC
Interface Singlemode DWDM
Compliance Code ZR+
Distance 480 km
Temperature Range 0°C - 70°C
Bandwidth 425 Gbit/s
Digital Diagnostic Management (DDM) Yes, internally calibrated
Power Consumption 23 W
Inbuilt FEC No
Powerbudget (dB) 6 dB
Transmit min/max per lane -10 dBm / -6 dBm
Receiver min/max per lane -12 dBm / 0 dBm (overload) @400G
Wavelength TX (Typical) tunable Coherent DWDM
TX Tunable Range 1528.77 - 1567.13 nm
Wavelength RX (Range) 1528.8 - 1567.1 nm
Laser EML
Receiver Type Coherent
Modulation DP-16QAM @400G
Chromatic Dispersion Tolerance 0 ps/nm to 20,000 ps/nm @400G
Supported Protocols 300G Ethernet, 4x 100G Ethernet, 400G Ethernet, 200G Ethernet, 100G Ethernet

Configure Transceiver Using Your FLEXSOX

It's that easy to use
1. Slide-In
2. Insert A Transceiver
  • Insert a Universal Transceiver into the corresponding slot
3. Select And Configure
  • Choose vendor and compatibility
  • Press play
  • Configuration only takes a few seconds
4. Use With Device
  • Use the transceiver in your device. That's it!
  • Need it for another device? - Re-configure it again and again


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  • MSA Standard compatible
Your vendor / compatibility is missing?

What customers say

On more than one occasion the flexbox significantly saved time for me by not having to scrub a deployment session but simply reconfigure a transceiver and carry on. This alone is a good reason that secures the flexbox a non-negotiable place in my datacenter-go-bag. However what really sets flexoptix apart is not them solving an irritating problem we all know. No. It is their vast inventory and know-how paired with impeccable QA. If I have a need for transceivers it is my single go-to source for procurement. They have exactly what I need in stock even before I know I need it, and when I need it, I can trust the order is in my hands in no time. Every single time. I can configure and deploy without doubt and without delay. It is rare to find such a valuable and dependable partner that reliably takes away a whole set of problems while offering decent pricing and a customer support that is above reproach.
Michael Horn Telecommunications Infrastructure Security Professional

The SFPs easily integrated with our existing network equipment, ensuring cross-vendor compatibility. The build quality is very good.
Connecting to the FLEXBOX with an Android phone took only a few seconds, and configuring the SFPs was a breeze. We really liked the ability to configure multiple SFPs at once. Shipping is incredibly fast. Support is friendly, technical and helpful.

Sebastian Giss System Engineer/cyon.ch
Your FLEXBOX rocks. On our Linux workstations we can easily change the vendor and thus save costs. In addition, we are also convinced by the product quality, the support and the handling of the order. Thank you!
Martin Verges Managing director, croit GmbH
FLEXBOX allows us to reduce the amount of spare transceivers we keep for our diverse hardware systems, thereby keeping overall cost low.
Sven Gebhardt Head of Platforms & Services, grandcentrix GmbH