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APD20B1/C1 on Carrier
25 Gb/s Avalanche Photodiode with Integrated Lens

Bottom-illuminated, 25 Gb/s avalanche photodiode (APD) chip with integrated backside lens mounted onto ceramic carrier. This innovative APD provides low noise multiplication and a high gain-bandwidth product which enables the design of high sensitivity 25G receivers. Typical applications include 28 Gbaud PAM-4, 100GBASE-ER4 and 25G EPON.
The integrated backside lens focuses the incoming light beam on the topside detecting area, enabling an easy and efficient optical coupling.
The APD is flip-chip bonded on a metallized ceramic submount with a T-shaped, coplanar GSG, or a Y-shaped contact layout. The large pads allow placement of multiple bonds.


  • Low noise multiplication
  • High gain-bandwidth product
  • Enabling high sensitivity 25G receivers
  • Large lens diameter of 100 μm
  • High responsivity: 0.8 A/W
  • Flip-chip soldered onto ceramic carrier
  • Customized versions available on request

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