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800G ZR+ Pro QSFP-DD Coherent Optical Transceiver
The C-LIGHT CL800GQDDZR+ is an 800G coherent optical transceiver designed for high-capacity DWDM transmission, data center interconnects, and advanced optical transport networks. Combining C-band tunable optics, an integrated EDFA, and support for multiple coherent operating modes, it provides a flexible interface for 400G and 800G optical networking applications.
1. Product Overview
As data center interconnect bandwidth continues to increase, coherent optical technology provides a practical way to transport high-capacity Ethernet signals over single-mode fiber. The C-LIGHT CL800GQDDZR+ integrates coherent transmission technology into a QSFP-DD package, bringing 800G-class optical connectivity into compatible high-density network platforms.
Designed around the 800ZR+ application, this module also supports 800ZR and 400ZR++ operating modes. Its tunable C-band transmitter, integrated EDFA, and adjustable output power make it suitable for optical systems that require configurable wavelength and transmission-power settings.
2. Key Features and Advantages
800G Coherent Transmission
Supports 800ZR and 800ZR+ operating modes using 16QAM modulation, as well as a 400ZR++ QPSK mode. This provides multiple coherent application options within one product platform.
C-Band Tunable Wavelength
Supports a tunable frequency range from 191.3 to 196.1 THz, with flexible DWDM frequency adjustment. The datasheet specifies 150 GHz grid-spacing support and 0.1 GHz fine-tuning.
Integrated EDFA
An internal EDFA supports adjustable transmit optical power. The specified tunable output range is -10 to +1 dBm across the C-band, with output up to +4 dBm at 193.7 THz.
Flexible Client Signal Support
Supports 100GbE, 200GbE, 400GbE, and 800GbE client signals, allowing the module to address different high-speed optical transport requirements.
QSFP-DD Type 2B Package
Complies with the QSFP-DD MSA using a Type 2B package with a closed-top heatsink, designed for compatible high-density host equipment.
Advanced Operational Functions
Supports ingress LF hold-off time configuration and hitless firmware upgrade, helping simplify selected operational and maintenance tasks.
3. Main Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | CL800GQDDZR+ |
| Product Type | 800G ZR+ Pro Coherent Optical Transceiver |
| Package | QSFP-DD, Type 2B, closed-top heatsink |
| Supported Client Signals | 100GbE / 200GbE / 400GbE / 800GbE |
| Applications | 800ZR / 800ZR+ / 400ZR++ |
| Frequency Range | 191.3-196.1 THz, C-band |
| DWDM Tuning | 150 GHz grid-spacing support; 0.1 GHz fine-tuning step; flexible DWDM grid specification of 3.125 GHz |
| Integrated Amplifier | EDFA |
| Transmit Optical Power | -10 to +1 dBm tunable across C-band; up to +4 dBm at 193.7 THz |
| Optical Connector | Duplex LC |
| Power Supply | Single 3.3 V |
| Typical Power Consumption | 29 W for 800GbE ZR+ |
| Operating Case Temperature | 0°C to 75°C |
| Compliance | QSFP-DD MSA, OIF 800ZR IA, OpenROADM MSA Version 7.0, RoHS 2 |
4. Coherent Operating Modes: 800ZR, 800ZR+, and 400ZR++
One important feature of the CL800GQDDZR+ is its support for multiple coherent operating modes. The datasheet specifies different modulation formats, baud rates, and FEC arrangements according to the selected application.
| Operating Mode | Modulation | Baud Rate | FEC |
|---|---|---|---|
| 800ZR | 16QAM | 118 GBd | OFEC |
| 800ZR+ | 16QAM | 118 GBd | OFEC |
| 800ZR+ Extended Mode | PCS-16QAM | 124 GBd | SDFEC |
| 400ZR++ | QPSK | 118 GBd | OFEC |
These operating modes provide different transmission configurations for 400G and 800G coherent applications. The actual operating mode, FEC compatibility, and optical-line requirements must be matched with the connected equipment.
5. Transmission Distance and DWDM Capability
The CL800GQDDZR+ is designed for coherent transmission over single-mode fiber. Its tunable C-band operation allows wavelength selection within the supported frequency range, making it suitable for DWDM systems where channel planning and optical-line compatibility are essential.
| Application | Published Reach in Datasheet | Optical Technology |
|---|---|---|
| 800G | 480 km; chromatic-dispersion support listed up to 850 km | Coherent 16QAM |
| 400G | 2,400 km | Coherent QPSK |
6. Typical Applications
800G Data Center Interconnect (DCI)
Connects high-capacity data center sites over single-mode fiber using tunable coherent DWDM channels. It is suitable for DCI designs that require 800G-class interfaces and compatible optical transport infrastructure.
Metro and Regional DWDM Networks
Supports high-capacity optical transport across metro and regional networks where tunable C-band wavelengths and coherent transmission are required.
Optical Transport Infrastructure
Its OIF 800ZR IA and OpenROADM MSA Version 7.0 compliance makes it relevant to compatible coherent optical transport architectures and open optical networking environments.
400G to 800G Network Evolution
Support for 400ZR++ and 800ZR/800ZR+ operating modes provides options for network designs using different coherent capacity requirements, subject to host and line-system compatibility.
7. Standards and System Integration
The CL800GQDDZR+ is designed around established coherent optical and module-interface specifications. These standards help define the module's physical package, optical functionality, and interoperability requirements.
QSFP-DD MSA: Defines the module interface and packaging requirements. This product uses a Type 2B closed-top heatsink design.
OIF 800ZR IA: Supports the 800ZR coherent optical interoperability framework.
OpenROADM MSA Version 7.0: Supports the stated OpenROADM specification alignment.
RoHS 2: Meets the stated restricted-substance compliance requirement.
Before deployment, verify the host switch or transport platform's QSFP-DD support, coherent mode, firmware, optical power limits, cooling arrangement, and supported line-system configuration. Standards compliance alone does not establish compatibility with every device or DWDM system.
8. Why Choose C-LIGHT CL800GQDDZR+?
C-LIGHT CL800GQDDZR+ combines high-capacity coherent transmission with tunable C-band operation in a QSFP-DD package. Its integrated EDFA, adjustable transmit power, multiple coherent modes, and support for 100G through 800G client signals make it a flexible product option for compatible optical transport designs.
C-LIGHT CL800GQDDZR+ at a Glance
800G ZR+ Pro QSFP-DD coherent optical transceiver.
Supports 800ZR, 800ZR+, and 400ZR++ applications.
C-band tunable DWDM operation.
Integrated EDFA with adjustable transmit optical power.
100GbE, 200GbE, 400GbE, and 800GbE client-signal support.
Duplex LC optical interface.
0°C to 75°C operating case temperature.
Hitless firmware upgrade support.
Designed and supplied by C-LIGHT for high-capacity coherent optical networking applications.
9. Conclusion
The C-LIGHT CL800GQDDZR+ 800G ZR+ Pro is a coherent QSFP-DD optical transceiver developed for high-capacity DWDM transmission and data center interconnect applications. With C-band wavelength tuning, integrated EDFA, configurable transmit power, and support for 800ZR, 800ZR+, and 400ZR++ modes, it addresses multiple coherent transmission requirements within one product family.
For deployment, the host platform, coherent operating mode, FEC configuration, optical line system, and target transmission distance should be evaluated together to ensure the module operates within the intended system design.
Looking for an 800G Coherent Optical Solution?
Contact C-LIGHT for product specifications, host compatibility evaluation, and application support for the CL800GQDDZR+ 800G ZR+ Pro QSFP-DD coherent transceiver.
Contact C-LIGHT Download Product Datasheet
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