Optical Performance Is Thermal Performance
Co-packaged optics puts a laser and an ASIC in the same thermal domain, where a wavelength shift of a fraction of a nanometer can take a link out of specification. Thermal design here is inseparable from optical link performance.
Why thermal decides the outcome here
Laser wavelength and output power are direct functions of junction temperature, and CPO packaging places that laser next to a switching ASIC that can swing tens of watts under bursty network traffic. Thermal stability, not just thermal capacity, is the design target.
- Maintaining laser junction temperature stability within ±1–2 °C
- Thermoelectric cooler (TEC) sizing and control-loop design
- Thermal-optical coupling and wavelength drift
- CPO cross-talk between laser and ASIC thermal domains
- Transient thermal response under bursty network traffic
- Laser diode junction temperature stability
- TEC heat-pumping capacity and control response
- Thermal-optical coupling (temperature-dependent refractive index)
- Co-package conductive coupling between laser and ASIC
- Transient thermal response to variable data-rate loading
- Telcordia GR-468 (reliability of optoelectronic devices)
- OIF implementation agreements (co-packaged optics)
- IEEE 802.3 (Ethernet physical layer, thermal-adjacent requirements)
Simulation shows the design. Measurement proves it.
Paid engineering engagements for this industry.
- 01
TEC sizing and thermal-optical coupling simulation
- 02
CPO cross-talk analysis between laser and ASIC domains
- 03
Transient thermal characterization under bursty traffic profiles
Hold the laser's thermal envelope steady, and the link stays in spec.
Talk to a thermal specialist about TEC sizing and thermal-optical coupling for your CPO module.
Talk to a Thermal Specialist →