March 10, 2026, Shenzhen, China. – GIGALIGHT, a company committed to differentiated technologies, has recently announced the launch of its latest 400G QSFP-DD PSM DWDM4 optical module based on the O-Band (original band). This new product further expands the company’s O-Band DWDM product portfolio and provides a cost-effective new solution for 400G DWDM links.

1. Introduction to the ColorX 400G QSFP-DD PSM DWDM4 O-Band Silicon Photonics Module

The product is based on 4×100G PAM4 silicon photonics modulation technology, covering 16 wavelengths with a 200 GHz channel spacing.

O-band (1310 nm window) DWDM technology, leveraging its natural zero-dispersion characteristics, redefines a cost-efficient DCI interconnection standard for 400GE.

Key Features:

• DCM-Free Operation:
  Operating in the zero-dispersion region of the O-band, eliminating the need for expensive and bulky dispersion compensation modules (DCM). This significantly simplifies line card design and reduces insertion loss.
• Ultra-Low Power Consumption:
  Utilizing advanced silicon photonics integration technology, the module achieves industry-leading power efficiency (power consumption < 11 W), making it ideal for high-density data center deployments.
• Ultra-Low Latency:
  By eliminating the DSP-based dispersion compensation used in coherent modules, the transmission latency of the optical module is significantly reduced.

2. Application Scenarios of the ColorX 400G QSFP-DD PSM DWDM4 O-BAND Silicon Photonics Module

• Metro Access and Aggregation Networks: Provides a cost-effective solution for 5G fronthaul and enterprise private line services.
• Data Center Interconnect (DCI): Supports short- to medium-reach transmission within 30 km, meeting the requirements of distributed computing infrastructure.
• Open Optical Networks: Decouples from white-box equipment, improving network deployment flexibility.

15 km Data Center Interconnect (without SOA amplifier).

30 km Data Center Interconnect (with SOA amplifier)

30 km Data Center Interconnect (with SOA amplifier)

3. Industry Value of the ColorX O-BAND Optical Modules

According to the Product Director of Eoptolink:
“O-Band has unique advantages in metro network scenarios due to its dispersion characteristics. The newly launched 400G DWDM4 module addresses the urgent market demand for cost-effective DWDM solutions for short- and medium-reach transmission, and is particularly suitable for data center interconnect (DCI), telecom edge network upgrades, and various niche markets that require high cost-performance solutions.”

Product roadmap:

ColorX O-BAND 100G QSFP28 DWDM1 – a complementary and breakthrough solution to 100G coherent technology.
ColorX O-BAND 200G QSFP-DD PSM DWDM4 – a complementary and breakthrough solution to 200G coherent technology.
ColorX O-BAND 400G QSFP-DD PSM DWDM4 – a complementary and breakthrough solution to 400G coherent technology.
ColorX O-BAND 800G QSFP-DD PSM DWDM4 – a complementary and breakthrough solution to 800G coherent technology.
ColorX O-BAND 800G OSFP PSM DWDM4 – a complementary and breakthrough solution to 800G coherent technology.

We believe that Eoptolink’s O-BAND DWDM technology journey will bring new value and fresh possibilities to users and the entire industry.

About GIGALIGHT

As an open optical networking explorer, GIGALIGHT integrates the design, manufacturing, and sales of both active and passive optical devices and subsystems. The company’s product portfolio includes optical modules, silicon photonics modules, liquid-cooled modules, passive optical components, active optical cables, direct attach copper cables, coherent optical communication modules, and OPEN DCI BOX subsystems. GIGALIGHT focuses on serving applications such as data centers, 5G transport networks, metropolitan WDM transmission, ultra-HD broadcast and video, and more. It stands as an innovative designer of high-speed optical interconnect hardware solutions.