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Side Illuminated Low Entry Monitor Photodiode


Side illuminated monitor photodiode chip that has an angled side facet and a large active area for monitoring the optical output emitted from the backside of edge-emitting lasers that are mounted p-side down. This low entry, side illuminated monitor photodiode is optimized for monitoring FP or DFB lasers used in single-mode data- and telecom applications as well as EDFA pump lasers. The monitor diode offers excellent responsivity in the wavelength region from 980 to 1620 nm.

The incoming laser light, emitted from a p-down mounted edge emitting laser, is refracted by the angled side facet onto the active area. Thanks to this unique side facet, a bulky and expensive “wrap-around” submount is not required.


  • Side illuminated, low entry InGaAs monitor photodiode
  • Light-entry facet angle: 27°
  • Low bias voltage: 1.5 V

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