Immersion Liquid-Cooled Optical Transceivers for AI and High-Density Data Centers

The rapid growth of artificial intelligence, high-performance computing, and hyperscale data centers is creating an unprecedented demand for computing power and network bandwidth.

As GPU density continues to increase, traditional air cooling can become increasingly difficult and inefficient. More AI infrastructure operators are therefore evaluating or deploying immersion liquid cooling to improve thermal management, increase rack density, and reduce the energy required for cooling.

But moving servers and networking equipment into an immersion environment creates a new challenge:

Can the optical interconnect continue to operate reliably inside dielectric cooling fluid?

For Taiwan manufacturer Optech, the answer is not limited to supplying standard optical transceivers.

Optech provides Immersion Liquid-Cooled Optical Transceiver solutions and supports customized designs for customers building next-generation AI, HPC, cloud, and high-density data center infrastructure.

From product configuration and mechanical design to material selection, compatibility coding, optical performance verification, and project-specific customization, Optech can work with customers to develop optical connectivity solutions suitable for immersion cooling environments.

Optech solutions can cover high-speed applications including:

• 100G optical connectivity
• 200G optical connectivity
• 400G optical connectivity
• 800G optical connectivity
• 1.6T next-generation optical interconnects
• DAC, AOC, AEC, and related high-speed interconnect requirements

For eligible projects, Taiwan-origin and TAA options are also available.

What Is an Immersion Liquid-Cooled Optical Transceiver?

An immersion liquid-cooled optical transceiver is an optical module designed or adapted to operate in an environment where networking equipment is partially or fully submerged in a dielectric cooling liquid.

Unlike conventional data centers, where airflow removes heat from switches, servers, GPUs, and optical modules, immersion cooling transfers heat directly into a specially engineered non-conductive fluid.

The liquid absorbs heat from electronic components much more efficiently than air and transfers that heat to an external cooling system.

However, standard optical modules are normally designed for air-cooled environments.

When optical transceivers are used in immersion systems, engineers must consider factors such as:

• Cooling-fluid compatibility
• Material stability
• Connector and cable compatibility
• Mechanical sealing
• Adhesive compatibility
• Optical interface protection
• Module temperature behavior
• Long-term exposure to dielectric fluid
• Corrosion resistance
• Label durability
• Firmware and platform compatibility

This means an immersion-ready optical module requires more than simply placing a conventional transceiver into liquid.

Why Immersion Cooling Is Becoming Important for AI Infrastructure

Modern AI clusters concentrate enormous amounts of computing power into a relatively small physical footprint.

GPU systems designed for large language model training, inference, scientific computing, and generative AI can consume significant electrical power and generate substantial heat.

As server and switch density increases, cooling becomes a major infrastructure challenge.

Immersion cooling offers several potential advantages.

Higher Rack Density

Traditional air-cooled data centers are limited by how much heat fans and air-conditioning systems can remove from a rack.

Immersion cooling can support much higher thermal density, allowing operators to deploy more computing power in the same physical space.

Improved Thermal Efficiency

Liquid can transfer heat more efficiently than air.

By bringing the cooling medium directly into contact with heat-generating components, immersion systems can reduce dependence on high-speed fans and complex airflow management.

Reduced Fan Power

In some immersion architectures, server and switch fans can be reduced or eliminated, helping decrease system-level power consumption.

More Stable Component Temperatures

Immersion cooling can help maintain a more consistent thermal environment, potentially reducing large temperature fluctuations.

For high-speed optical transceivers operating at 400G, 800G, and 1.6T, stable thermal conditions can be especially valuable.

Better Support for Future AI Hardware

As GPU platforms and high-speed switches continue increasing in power density, liquid cooling is becoming an increasingly important technology for next-generation AI infrastructure.

Why Standard Optical Transceivers May Not Be Suitable for Immersion Cooling

A conventional optical transceiver is normally developed for operation in air.

Its housing, adhesives, labels, gaskets, optical interface, PCB materials, thermal pads, and other components may not have been selected for continuous exposure to dielectric fluids.

Several issues can therefore occur when a standard transceiver is used in immersion cooling.

Material Compatibility

Some cooling fluids can interact with plastics, adhesives, coatings, elastomers, or cable jackets over extended periods.

Material compatibility must therefore be evaluated carefully.

Optical Connector Reliability

LC, MPO/MTP, or other optical interfaces must maintain stable optical performance even when the surrounding environment changes.

Contamination or fluid migration near optical mating surfaces must be considered during system design.

Label and Marking Durability

Conventional module labels may not be designed for prolonged liquid exposure.

For immersion applications, labeling materials and printing methods may need to be changed.

Thermal Design Differences

Traditional pluggable modules use airflow and heatsinks to dissipate heat.

In immersion systems, heat transfer behaves differently.

Mechanical and thermal design may therefore need to be optimized for direct liquid contact.

Long-Term Reliability

A module that works for several hours in immersion fluid is not necessarily suitable for continuous production operation.

Long-term stability needs to be considered at the component, module, and system levels.

Optech Immersion Liquid-Cooled Optical Transceiver Solutions

Optech understands that immersion-cooled data centers often require project-specific solutions rather than off-the-shelf optics.

For this reason, Optech can work with customers on both standard product adaptation and customized optical transceiver development.

Depending on the project requirements, solutions may include:

400G Optical Transceivers

400G optical modules remain important for AI server connectivity, switch uplinks, and data center network infrastructure.

Possible form factors include:

• QSFP-DD
• QSFP112
• OSFP

800G Optical Transceivers

800G has become a major interconnect speed for modern AI and GPU cluster fabrics.

Optech can support 800G optical solutions for applications involving:

• AI switch-to-switch connectivity
• GPU networking
• Spine-leaf architectures
• InfiniBand networks
• Ethernet AI fabrics
• High-density data center networks

1.6T Optical Transceivers

As AI networks move toward 200G-per-lane architectures, 1.6T optics are becoming increasingly important.

Optech's high-speed optical roadmap includes 1.6T solutions for next-generation AI and HPC infrastructure.

For immersion-cooled AI systems, 1.6T optics provide a path toward combining extremely high bandwidth density with advanced thermal-management architectures.

Customization Capability Is Critical for Immersion Applications

One of the most important differences between conventional optics and immersion-ready optics is the need for customization.

Every immersion system can be different.

Customers may use different:

• Cooling fluids
• Tank designs
• Switch platforms
• Cable routing architectures
• Fiber connector types
• Operating temperatures
• Rack layouts
• Module speeds
• Network protocols

For this reason, Optech can work with customers to review project-specific requirements and provide customized solutions.

Optech Customization Capabilities

Depending on project requirements, customization can include:

Mechanical Design

Housing, heatsink, pull-tab, latch, and structural elements can be evaluated for immersion environments.

Material Selection

Materials can be reviewed based on the cooling fluid specified by the customer.

This may include:

• Housing materials
• Plastics
• Elastomers
• Adhesives
• Cable jackets
• Label materials
• Protective coatings

Optical Interface Configuration

Optech can support multiple optical connector architectures, depending on module type and network design.

Examples include:

• LC
• MPO/MTP
• Dual LC
• Dual MPO/MTP
• Parallel single-mode optics
• Wavelength-multiplexed optics

Firmware and EEPROM Coding

High-speed optics must often be coded for specific networking platforms.

Optech can provide compatibility-oriented firmware and EEPROM configuration based on the customer's switch, NIC, or network environment.

Customized Labeling

For immersion applications, customers may require:

• Fluid-resistant labels
• Customized serial numbers
• Customer logos
• Product traceability
• Country-of-origin marking
• TAA documentation

Cable and Breakout Design

Some immersion systems require specialized cable routing or breakout architectures.

Optech can work with customers on custom optical and copper interconnect designs for these environments.

Key Benefits of Optech Immersion Liquid-Cooled Optical Transceivers

1. Designed for High-Density AI Infrastructure

Immersion cooling is particularly suitable for high-power environments such as:

• AI training clusters
• GPU farms
• HPC systems
• Supercomputing centers
• Cloud infrastructure

Optech's high-speed optics can support the corresponding network bandwidth requirements.

2. High-Speed Connectivity from 100G to 1.6T

Optech's broad optical portfolio enables customers to design immersion-cooled networks across multiple generations of connectivity.

Instead of sourcing different speeds from multiple vendors, customers can work with one optical supplier across the network.

3. Custom Engineering Support

Immersion projects often require modifications that cannot be addressed by a standard catalog product.

Optech can work with customers from initial requirement analysis through sample qualification and production.

4. Compatibility-Focused Development

Optech has experience supporting optical compatibility across major networking platforms.

For immersion projects, firmware and EEPROM configuration can be matched to the customer's target platform.

5. Flexible Connector and Reach Options

Different AI network zones require different optical reaches.

Optech can support short-, medium-, and longer-reach optical architectures using parallel optics or wavelength-division multiplexing.

6. Taiwan Manufacturing

For customers seeking diversified optical supply chains, Optech provides Taiwan-based manufacturing and technical support.

7. TAA Options Available

For eligible product configurations and procurement projects, Optech can support Taiwan-origin and TAA-related requirements.

Final compliance should be confirmed based on the specific manufacturing configuration and procurement rules.

Typical Application Scenarios

AI Training Clusters

Large GPU clusters require high-bandwidth, low-latency communication between servers and switches.

Immersion cooling can improve thermal management while Optech high-speed optics provide the required network connectivity.

Potential speeds include:

400G → 800G → 1.6T

depending on the generation of GPU and switching infrastructure.

High-Performance Computing

HPC clusters often operate at extremely high compute density.

Immersion cooling can help reduce thermal limitations while high-speed optical interconnects connect compute, storage, and switching layers.

Hyperscale Data Centers

Hyperscale operators continuously seek to increase compute density while improving energy efficiency.

Immersion liquid cooling combined with high-speed optical transceivers can support large-scale network expansion.

GPU Cloud Infrastructure

GPU cloud providers need flexible systems that can accommodate rapid changes in server and GPU density.

Immersion-ready optical solutions can help support next-generation GPU cloud architecture.

Edge AI Data Centers

Space-constrained edge facilities may benefit from immersion cooling because it allows high compute density within a limited footprint.

High-speed pluggable optics can then connect these facilities to core or cloud networks.

Research and Supercomputing Centers

Universities, laboratories, and research institutions increasingly deploy large AI and HPC systems.

Immersion cooling combined with high-speed optics can support dense computing environments while maintaining high network bandwidth.

Telecommunications and Network Infrastructure

Immersion cooling may also be considered in specialized telecom, edge, or industrial environments where equipment density or environmental conditions make conventional air cooling difficult.

Immersion Cooling and 800G / 1.6T AI Networks

The transition from 400G to 800G and 1.6T creates a particularly strong case for advanced thermal management.

As lane rates increase from 100G PAM4 toward 200G PAM4, transceiver power density becomes increasingly important.

In a traditional air-cooled environment, higher-power optical modules can add additional heat near the switch faceplate.

When dozens of high-speed modules are installed in one switch, thermal density can become significant.

Immersion cooling changes the thermal environment around both the switch and the transceiver.

For future AI infrastructure, this creates the potential to combine:

Higher compute density + higher switch density + higher optical bandwidth

This is why immersion-compatible optics are becoming an increasingly important part of next-generation data center planning.

Single-Phase vs Two-Phase Immersion Cooling

Immersion cooling systems can generally be divided into two architectures.

Single-Phase Immersion Cooling

In a single-phase system, electronic equipment is submerged in dielectric fluid that remains in liquid form during operation.

The heated fluid is circulated through a heat exchanger and returned to the tank.

Single-phase systems are commonly considered for:

• AI servers
• GPU systems
• HPC infrastructure
• High-density data centers

Two-Phase Immersion Cooling

In a two-phase system, the cooling liquid can boil at a controlled temperature.

Heat from electronic components causes the fluid to vaporize, and the vapor then condenses on a cooling surface and returns to the tank.

The requirements for material compatibility can differ significantly between single-phase and two-phase systems.

For this reason, customers should provide the exact cooling architecture and coolant information when discussing an immersion optical transceiver project with Optech.

What Information Should Customers Provide for a Custom Immersion Project?

Because immersion cooling systems vary widely, Optech recommends providing detailed technical information during the quotation and engineering stage.

Important information includes:

• Optical transceiver speed
• Required form factor
• Target networking platform
• Switch or NIC model
• Ethernet or InfiniBand protocol
• Transmission distance
• Fiber type
• Connector type
• Cooling-fluid manufacturer and model
• Single-phase or two-phase cooling
• Operating temperature
• Expected immersion duration
• Required cable length
• Required annual quantity
• Sample quantity
• Label requirements
• Serial-number requirements
• TAA requirements

With this information, Optech can evaluate the project and recommend an appropriate solution.

Why Choose Optech for Immersion Cooling Optics?

Immersion cooling is not a one-size-fits-all application.

Customers need a supplier that understands both high-speed optical networking and customization.

Optech provides:

• High-speed optical transceivers from established speeds to 800G and 1.6T
• Experience with AI and HPC networking applications
• Immersion cooling project support
• Customized mechanical and material design capability
• Firmware and compatibility configuration
• Optical testing
• Sample qualification
• Customized cables and breakout solutions
• OEM / ODM support
• Taiwan manufacturing
• TAA options for eligible configurations
• Project-based technical support
• Volume production capability

For customers developing next-generation liquid-cooled AI infrastructure, Optech can participate from prototype evaluation through mass production.

From Prototype to Volume Production

Immersion cooling projects often begin with engineering samples.

A typical project process may include:

Requirement Review → Product Selection → Custom Design → Sample Production → Fluid Compatibility Evaluation → Platform Testing → Customer Qualification → Volume Production

This project-based workflow allows customers to validate both optical and mechanical performance before moving into larger deployments.

Optech welcomes customers to provide their immersion cooling requirements for joint evaluation.

Taiwan Manufacturing and TAA Options

For customers working on U.S. government, public-sector, research, education, or regulated procurement projects, country-of-origin requirements can be important.

Optech is a Taiwan-based optical transceiver manufacturer and can provide Taiwan-origin and TAA options for eligible configurations.

Depending on the project, Optech can also support documentation requirements such as:

• Country of origin
• Product serial-number records
• Manufacturing information
• Customized labeling
• Product traceability
• Compliance documentation

Final TAA status should always be confirmed according to the specific product configuration and applicable procurement requirements.

Ready for Your Immersion Cooling Project?

As AI infrastructure continues moving toward higher power density and higher network bandwidth, immersion liquid cooling and next-generation optical interconnects are increasingly becoming part of the same system design.

Optech can support customers with Immersion Liquid-Cooled Optical Transceivers, customized high-speed interconnects, and project-specific engineering services.

Whether your project requires:

• 400G
• 800G
• 1.6T
• OSFP
• QSFP-DD
• QSFP112
• Custom optical modules
• Custom breakout solutions
• Immersion-compatible cables
• Special labeling
• Platform-specific coding
• TAA options

Optech welcomes your inquiry.

Contact Optech for samples, customized development, project pricing, compatibility evaluation, and volume orders.

FAQ

1. What is an immersion liquid-cooled optical transceiver?

An immersion liquid-cooled optical transceiver is an optical module designed or customized for operation in equipment that is submerged in dielectric cooling liquid. Compared with standard air-cooled modules, material compatibility, thermal behavior, optical interfaces, mechanical design, and long-term exposure to cooling fluid must be considered.

2. Can a standard optical transceiver simply be submerged in cooling liquid?

Not necessarily. A conventional transceiver may contain materials, labels, adhesives, plastics, or other components that have not been evaluated for long-term exposure to a specific dielectric fluid.

For production deployment, the exact coolant and operating environment should be evaluated.

3. Does Optech provide immersion liquid-cooled optical transceivers?

Yes. Optech has relevant high-speed optical products and can work with customers on immersion cooling applications, including customized optical transceiver and high-speed interconnect requirements.

4. What speeds can Optech support?

Depending on the project and platform, Optech's portfolio can cover optical connectivity from established network speeds through 400G, 800G, and next-generation 1.6T solutions.

5. Can Optech customize the module for a specific cooling fluid?

Optech can evaluate project-specific requirements based on the coolant, mechanical architecture, target switch, optical reach, connector type, and operating conditions.

Customers should provide the exact cooling-fluid specification during project evaluation.

6. What information is needed for an immersion transceiver project?

Customers should ideally provide the target module speed, form factor, switch/NIC model, coolant type, single- or two-phase system, transmission distance, connector type, operating temperature, quantity, and TAA requirements.

7. Are immersion optics suitable for AI data centers?

Yes. Immersion cooling is particularly relevant to high-density AI environments because GPU servers and high-speed switches can generate significant heat.

400G, 800G, and 1.6T optical connectivity can support the high-bandwidth network requirements of these systems.

8. What are the main advantages of immersion cooling?

Potential benefits include higher rack density, improved heat-transfer efficiency, reduced dependence on server fans, more stable component temperatures, and better support for high-power AI infrastructure.

Actual benefits depend on the cooling architecture and data center design.

9. Can Optech provide custom cables for immersion applications?

Optech can work with customers on customized high-speed interconnect solutions, including optical and copper cable requirements, breakout architectures, connector configurations, and project-specific cable lengths.

10. Does Optech support NVIDIA-compatible immersion optical solutions?

Optech has experience with high-speed optical compatibility for AI networking environments. For a specific NVIDIA platform, customers should provide the exact switch, NIC, protocol, firmware, reach, and cooling architecture so the correct configuration can be evaluated.

11. Are Optech immersion optical transceivers TAA compliant?

Optech can provide Taiwan-origin and TAA options for eligible product configurations and projects. Final compliance must be confirmed based on the specific manufacturing configuration and applicable procurement requirements.

12. Can Optech provide samples before mass production?

Yes. Customized immersion projects can begin with engineering samples for customer qualification before moving into volume production.

13. Can Optech support OEM and ODM projects?

Yes. Optech can work with customers on OEM/ODM requirements including product configuration, coding, labeling, serial-number control, mechanical customization, and project-specific optical interconnect design.

14. Why choose Optech for immersion cooling optical transceivers?

Optech combines high-speed optical transceiver manufacturing, AI/HPC networking experience, customization capability, platform compatibility support, Taiwan manufacturing, and TAA options. This allows customers to work with Optech from early sample evaluation through volume deployment.

Conclusion

As AI data centers move toward increasingly powerful GPU platforms, cooling and networking can no longer be planned independently.

Higher compute density leads to higher thermal density, while AI workloads simultaneously require 400G, 800G, and eventually 1.6T optical connectivity.

Immersion Liquid-Cooled Optical Transceivers provide an important bridge between these two requirements.

For customers developing immersion-cooled AI, HPC, cloud, or high-density data center infrastructure, Optech provides not only high-speed optical products but also customization capability, compatibility engineering, sample qualification, Taiwan manufacturing, and TAA options.

From a standard high-speed optical module to a project-specific immersion-ready interconnect solution, Optech is ready to work with customers from prototype to volume production.

Contact Optech today for samples, customized immersion cooling solutions, pricing, and volume orders.