Optical Communication Patent Landscape for Co-Packaged Optics

Overview of Technical Issues:

Your query requests a patent landscape overview for co-packaged optics rather than identifying a specific technical problem to solve. To conduct meaningful functional analysis and extract key technical contradictions, I need you to clarify which specific technical challenge in co-packaged optics you want to address—for example: thermal crosstalk between electronic and optical components causing wavelength drift and signal degradation, insufficient optical alignment stability under thermal cycling, inadequate heat dissipation at high power densities, or manufacturing integration difficulties between different material systems.

Solution directions generated for this problem

Problem Direction 1 :

ImproveThermal isolation effectiveness
VS
ConstraintManufacturing integration complexity

Inspiration 1 : Cross-domain reference

Application Principle: #1 Segmentation
Cross-domain applicability Assess applicability
Multi-functional composite structure for extreme environments
Innovative Solution Refine solution

Pre-fabricated thermal isolation tile array with self-alignment features for co-packaged optics

Modular thermal tiles simplify assembly
How to solve :
  • Fabricate thermal isolation tiles at wafer scale with embedded silicon alignment posts (±0.3μm tolerance) and aerogel cores (thermal conductivity 0.015 W/m·K) pre-bonded to 0.6mm silicon frames
  • tiles undergo independent quality inspection (thermal resistance ≥200 K/W, dimensional tolerance ±1μm) before assembly
  • During package assembly, place pre-qualified tiles between electronic and photonic dies using passive mechanical registration — alignment posts mate with corresponding recesses on die edges, eliminating active alignment tools and reducing assembly steps from 15 to 6
  • Apply low-temperature eutectic bonding (150–180°C, 2–5 MPa pressure, 30s dwell) to attach tiles permanently
  • eutectic AuSn solder ensures <50μm bond-line thickness and hermetic sealing without thermal damage to photonic components
Expected Effect : Temperature variation <0.15°C; yield 70→82%; assembly time −60%
Risk Control :
  • tile-to-die interface void formation exceeding 5% area
  • alignment post shear strength below 15N threshold
  • aerogel moisture absorption during storage degrading thermal performance

Problem Direction 2 :

ImproveHeat dissipation capacity
VS
ConstraintThermal management system volume

Inspiration 1 : Cross-domain reference

Application Principle: #17 Another dimension
Cross-domain applicability Assess applicability
Rotating electrical machine
Innovative Solution Refine solution

Vertical through-substrate micro-channel heat extraction for co-packaged optics

Vertical micro-channel array through substrate beneath dies extracts heat downward instead of lateral spreading
How to solve :
  • Fabricate vertical micro-channel array (diameter 200-300μm, pitch 500μm) through silicon substrate directly beneath electronic and photonic dies using deep reactive ion etching (DRIE), achieving >15 channels/mm²
  • coat channel walls with copper electroplating (10-15μm thickness, thermal conductivity ≥380 W/m·K) to enhance vertical heat conduction, then seal channels with working fluid (deionized water or dielectric coolant) under vacuum (<10 Pa) to form embedded heat pipes with phase-change heat transfer coefficient 5000-8000 W/m²·K
  • integrate micro-channels into existing substrate layer without adding thickness, routing heat vertically to bottom-side heat sink while maintaining package thickness at 2.0-2.2mm and original footprint, eliminating need for top-side spreaders that add 1.5mm thickness
Expected Effect : Junction temp <85°C at 100W load; package thickness maintained at 2mm; heat extraction efficiency +55% vs baseline
Risk Control :
  • DRIE process uniformity across wafer (±5% depth tolerance required)
  • copper plating adhesion under thermal cycling 0-70°C
  • vacuum sealing integrity over 10-year lifespan

Problem Direction 3 :

ImproveThermal isolation effectiveness
VS
ConstraintHeat dissipation capacity

Inspiration 1 : Cross-domain reference

Application Principle: #1 Segmentation
Cross-domain applicability Assess applicability
Thermally optimized phase change memory cells and methods of fabricating the same
Innovative Solution Refine solution

Pre-fabricated thermal isolation tile array with integrated alignment features for co-packaged optics

Modular thermal barriers pre-fabricated at wafer level with embedded alignment marks
How to solve :
  • Fabricate thermal isolation tiles (0.6mm × 0.6mm × 0.15mm) from low-conductivity aerogel-polymer composite (≤5 W/m·K lateral, ≥200 W/m·K vertical via embedded copper pillars) at wafer scale with photolithography-defined alignment notches (±0.2μm tolerance)
  • During assembly, place pre-qualified tiles between electronic and photonic dies using passive vision alignment — notches mate with die-edge features, reducing active alignment steps from 15 to 6 and enabling parallel tile placement in 8-cavity fixtures
  • Tiles bond via pre-applied solder bumps (SAC305, reflow at 245°C for 90s) on tile underside, eliminating in-situ barrier deposition and multi-step curing — single reflow cycle bonds tiles and establishes thermal paths simultaneously
Expected Effect : Thermal crosstalk <0.18°C; assembly yield 72%; process steps reduced to 9; alignment time −65%
Risk Control :
  • tile-to-die co-planarity deviation >5μm causing bond voids
  • solder reflow temperature damaging photonic components
  • tile inventory management for multi-variant products

Problem Direction 4 :

ImproveThermal isolation effectiveness
VS
ConstraintMust not deteriorate

Inspiration 1 : Cross-domain reference

Application Principle: #3 Local quality
Cross-domain applicability Assess applicability
Hydrofluoropropene blowing agents for thermoplastics
Innovative Solution Refine solution

Spatially-graded thermal composite with orthogonal conductivity zones

Spatially-graded composite assigns distinct thermal properties to vertical and lateral zones
How to solve :
  • Fabricate vertical thermal pillars using electroplated copper (≥380 W/m·K) or CVD diamond (≥1000 W/m·K) directly beneath each die footprint, diameter 0.6–1.2mm, pitch 1.5–2.0mm, extending from die backside to heat sink interface
  • Fill inter-pillar lateral gaps with aerogel-polymer composite (silica aerogel 15–25 vol% in epoxy matrix, lateral conductivity <0.5 W/m·K, thickness 0.8–1.5mm) to block crosstalk between electronic and photonic zones
  • Pattern pillar layout using photolithography-defined electroplating masks on silicon interposer, inject aerogel composite via vacuum-assisted resin transfer at 60–80°C, cure at 120°C for 2 hours, achieving ±50μm pillar position tolerance and <5% void fraction in aerogel matrix
Expected Effect : Vertical heat extraction >500 W/m·K, lateral crosstalk <0.15°C, package thickness 2.2mm, 40% better than homogeneous spreaders
Risk Control :
  • pillar-to-die interface delamination under thermal cycling
  • aerogel moisture absorption degrading insulation
  • pillar electroplating uniformity affecting conductivity
Patsnap Eureka Solution