400G ZR + QSFP-DD High Tx Output Power

The 400G ZR+ QSFP-DD (High Tx Output Power) is a coherent pluggable transceiver for metro/region DCI and OSNR-challenging routes. It integrates a digital coherent DSP (DCO) and operates in the C-band DWDM ITU grid over LC-duplex fiber with a 400GAUI-8 host interface. Compared with standard ZR modules, the High Tx variant delivers increased launch power (model-dependent), providing extra link margin for longer spans, ROADM cascades, and paths with higher filter/insertion loss. It supports OIF 400ZR and optional OpenZR+ profiles (vendor-dependent) for extended reach.

• Standards & Modes

  • OIF 400ZR interoperability; optional OpenZR+ profiles (platform/model dependent)

  • Line modulation: DP-16QAM (ZR); additional QPSK/16QAM profiles for ZR+ (where supported)

  • Management: CMIS 4.0+ with DOM/diagnostics and alarms

• Optics & Reach

  • Band/Channel: C-band DWDM, ITU-T grid (75/100 GHz filter compatibility)

  • Connector/Fiber: LC-duplex, OS2 SMF

  • Typical reach: ~120 km (ZR); extended reach and ROADM traversal with ZR+ profiles (network- and profile-dependent)

  • High Tx Output Power: higher launch levels for improved OSNR and margin on multi-element paths (exact dBm depends on version)

• Performance & Power

  • Payload: 400 GbE

  • Integrated SD-FEC in-module for long-reach performance

  • Typical module power: ~16–20 W (platform/environment dependent)

• Reliability & Environment

  • Case temperature: 0 to +70 °C (commercial); extended range on request

  • Laser safety: Class 1 (IEC 60825-1) • RoHS/REACH compliant

• Use Cases

  • 400G DCI over dark fiber with higher span loss or multiple filters

  • DWDM MUX/DEMUX point-to-point with EDFA chains

  • ROADM networks requiring additional launch margin (ZR+ profiles)

Design note: High-power launch may require VOA/attenuation on short spans to avoid receiver saturation. Verify channel plan, attenuation, OSNR, CD/PDL, and EDFA gain/tilt against your DWDM design.