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Calculator
Atlasresearch

Workspace

WorkspacePokedexHPC MapPortfolioCalendarTaiwan RevenueMemory
Calculators
  • 01AI Factory
  • 02CPO Stack
  • 03HBM Bridge
  • 04GPU Cloud TCO
  • 05Inference Tokens
  • 06Power Bottleneck
  • 07Custom ASIC
  • 08OCS TAM
  • 09N3 Allocation
  • 10Optical TAM
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Calculators/CPO Stack

Jason's Chips

Subscribe or sign in with your Substack email for live inputs, outputs, and saved scenarios.

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Inputs

Scale-up add-on

Revenue

Last calculated: Not yet

Calculator 02Optical interconnect math

CPO Stack Calculator

Convert accelerator shipments into scale-out ports, CPO switch boxes, external laser sources, optical engines, high-power CW laser chips, and optical-stack revenue.

Sensitivity

CPO eligible XPUs

100K

10% of 1.00M XPUs

Active scale-out ports

200K

2.00 active ports / XPU

CPO switch boxes

1.9K

1,563 leaf boxes x 1.20

ELS modules

33.8K

18.0 ELS / switch

High-power CW lasers

270K

8 CW chips / ELS

Optical stack revenue

$267M

$91.3M source revenue at selected share

Unit bridge

XPUs to lasers

CPO XPUs

100K

Attach-filtered base

Scale-out ports

200K

0.8T each

Switch boxes

1.9K

1.20x leaf + spine

ELS + OEs

33.8K / 135K

4.00 OE / ELS blended

Bandwidth

Aggregate fabric160.0 Pbps
Port speed0.8T
Ports / switch128

Scale-up contribution

Scale-up OEs0
Scale-up ELS0
ELS / XPU0.034

Revenue bridge

CPO optical stack bill

$267M

42%
32%
9%
15%
2%
CategoryUnitsASPRevenue% of stack
CPO switch / package premium1.9K$60.0K$113M42%
External laser source modules33.8K$2.5K$84.4M32%
High-power CW laser chips270K$85$23.0M9%
Optical engine content135K$300$40.5M15%
FAU and optical attach135K$45$6.1M2%

Sensitivity analysis

Adoption rate x ELS per switch

Adoption \ ELS / switch14.016.018.0 base20.022.0
0%$0$0$0$0$0
5%$116M$125M$133M$142M$151M
10% base$232M$249M$267M$284M$301M
15%$348M$374M$400M$425M$451M
20%$464M$499M$533M$567M$601M

This grid isolates the two most important swing variables for the scale-out CPO revenue bridge: how much of the XPU base attaches to CPO, and how many ELS modules each CPO switch box requires.

Assumptions

Q3450

Generation1.6T OE / 800G ports
Preset note144x800G switch chassis, modeled with 18 ELS and 4 active OEs per ELS.
ELS / switch18.0
OE / ELS4.00
CW chips / ELS8
ELS / XPU0.034
Source share85%

Saved scenarios

CY26 scale-out base

1.00M XPUs / 33.8K ELS

$267M

SN6800 adoption ramp

2.50M XPUs / 300K ELS

$1.57B

Scale-up optical attach

3.00M XPUs / 304K ELS

$1.99B