Method for obtaining linear spectral responsivity of InGaAs-photodetector in the NIR wavelength range

Andrei Pokatilov*, Martin Parker, Toomas Kubarsepp, Viktor Vabson, Riho Vendt, Ilmar Ansko, Farshid Manoocheri

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)


A simple linear interpolation of the spectral responsivity of a special type detector has been obtained in the range from 960 nm to 1550 nm. The detector consisted of three InGaAs-based photodiodes arranged in reflection trap detector mode. In such a detector, the photodiodes are mounted in a configuration where the non-absorbed reflected light from the first photodiode is directed to the subsequent photodiode having totally five reflections in the detector. As a result, the overall reflectance of the trap detector is smaller than that of a single photodiode improving responsivity performance significantly. The trap detector was calibrated in the wavelength range from 840 nm to 1700 nm. We found that in the near infrared (NIR) spectral range from 960 nm to 1550 nm the responsivity of our trap detector is almost linear function of on the wavelength: the deviation of measured responsivity values from fitted line was within ±0.8 %.

Original languageEnglish
Title of host publicationProceedings of the 15th Biennial Baltic Electronics Conference, BEC 2016
Number of pages4
ISBN (Electronic)9781509013937
Publication statusPublished - 14 Nov 2016
MoE publication typeA4 Article in a conference publication
EventBiennial Baltic Electronics Conference - Tallinn, Estonia
Duration: 3 Oct 20165 Oct 2016
Conference number: 15

Publication series

NameProceedings of the biennial Baltic Electronics Conference
PublisherTallinn University of Technology
ISSN (Print)1736-3705
ISSN (Electronic)2382-820X


ConferenceBiennial Baltic Electronics Conference
Abbreviated titleBEC 2016


  • infrared
  • quantum detectors
  • radiometry
  • spectral properties

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