Introduction to the 400G QSFP-DD
The 400G QSFP-DD Digital Coherent Optics (DCO) transceiver is designed to support multi-rate coherent transmission for metro, regional, and
data center interconnect (DCI) applications.On the host side, the module supports either a single IEEE 400GE Ethernet signal or n × 100GE Ethernet
signals (n = 1, 2, or 4), which are multiplexed onto a single line interface. On the line side, this 400G QSFP-DD transceiver supports 400G 16QAM,
200G 16QAM, 200G QPSK, and 100G QPSK modulation, along with extended C-band operation and polarization diversity coherent detection.
The module uses an MSA-compliant QSFP-DD Type 2A form factor, measuring 93.26 mm × 18.35 mm × 8.5 mm.It conforms to the Common Management Interface Specification (CMIS) and the extensions defined in the OIF Coherent CMIS Implementation Agreement.A 76-pin connector provides the electrical interface to the system board. The module comprises a transmitter (Tx) unit, a receiver (Rx) unit, and several control units.
An internal microcontroller (MCU) supports modulator control, software management, alarm reporting, and performance monitoring.
Functions of the 400G QSFP-DD
Multi-Rate Coherent Transmission
Supports 400G, 200G and 100G coherent optical interfaces based on OpenZR+ MSA. The supported line-side modulation modes include 400G 16QAM, 200G 16QAM, 200G QPSK and 100G QPSK.
Full C-Band Tunability
Supports full C-band tunability and flexible grid operation. The specified optical frequency range is 190.7–196.65 THz, with a default channel frequency of 193.1 THz.
Compact QSFP-DD Form Factor
Features a QSFP-DD Type 2A form factor with dimensions of 93.26 × 18.35 × 8.5 mm. The module is hot-pluggable and uses a 76-pin connector to connect to the system board.
Host Interface Compatibility
Supports a host interface for a single IEEE 400GE Ethernet signal or \(n \times 100GE\) Ethernet signals, where \(n = 1, 2, 4\). The listed electrical interfaces include 400GAUI-8, 4×100GAUI-2, 2×100GAUI-2, 2×CAUI-4, 100GAUI-2 and CAUI-4.
Duplex LC Connector
The optical module is compatible with duplex LC connectors. Its coherent optical interface supports multiple transmission rates and modulation modes as specified in the product manual.
Metro, Regional & DCI Applications
The module supports multi-rate coherent transmission for metro and regional networks and data center interconnect applications, as described in the product manual.
Information Form
| Parameter | Conditions | Symbol | Min. | Max. | Unit |
|---|---|---|---|---|---|
| Rx signal input power | — | PRx,sig | -12 | 0 | dBm |
| OSNR tolerance | 400G 16QAM ZR+ | — | 23.5 | — | dB/0.1 nm |
| 200G 16QAM ZR+ | — | 19.5 | — | ||
| 200G QPSK ZR+ | — | 15 | — | ||
| 100G QPSK ZR+ | — | 12 | — | ||
| CD tolerance (OSNR penalty < 0.5 dB) | 400G 16QAM ZR+ | — | — | 9 | ns/nm |
| 100G QPSK ZR+ | — | — | 39 | ||
| PMD tolerance (OSNR penalty < 0.5 dB) | 400G 16QAM ZR+ | — | — | 23 | ps |
| 100G QPSK ZR+ | — | — | 30 | ||
| Tolerance to change in SOP (OSNR penalty < 1.25 dB) | 100G QPSK ZR+ | — | — | 1000 | krad/s |
| Rx signal input power transient amplitude | Peak excursion from steady state (within Rx signal input power range) | — | -7 | +7 | dB |
| Rx reflectance | — | — | — | -27 | |
| Rx signal input power monitor range | — | PRx,mon(s) | -22 | 1 | dBm |
| Rx signal input power monitor accuracy | — | δPRx,mon(s) | -2 | +2 | dB |
FAQ
What is a 400G QSFP-DD optical transceiver?
A 400G QSFP-DD optical transceiver is a high-speed optical module designed for 400G data transmission. This 400G QSFP-DD ZR+ coherent optical module supports a 400GE host interface and coherent optical transmission at 400G, 200G, and 100G based on the OpenZR+ MSA.
What applications does the 400G QSFP-DD ZR+ optical module support?
The 400G QSFP-DD optical module supports metro and regional networks as well as data center interconnect (DCI) applications. Its multi-rate coherent transmission capability enables operation at 400G, 200G, or 100G, depending on the selected mode.
What are the key specifications of this 400G optical transceiver?
This 400G optical transceiver features a QSFP-DD Type 2A form factor, full C-band tunability with a flex-grid interface, duplex LC connectors, and a maximum power consumption of 21 W. It operates with a 3.3 V power supply and has an operating case temperature range of 0°C to 70°C.
What data rates does the 400G QSFP-DD transceiver support?
The 400G QSFP-DD transceiver supports coherent optical transmission at 400G, 200G, and 100G based on the OpenZR+ MSA. On the host side, it supports IEEE 400GE Ethernet or n×100GE Ethernet, where n = 1, 2, or 4.
What connector does the 400G QSFP-DD optical module use?
This 400G QSFP-DD optical module uses duplex LC connectors for its optical interface. Before deployment, verify that the module’s optical characteristics and supported operating mode meet the requirements of your network equipment and link design.
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