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Spectrally resolved, broadband frequency response characterization of photodetectors using continuous-wave supercontinuum sources
Author(s): Vishal Choudhury; Roopa Prakash; K. P. Nagarjun; V. R. Supradeepa
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Paper Abstract

A simple and powerful method using continuous wave supercontinuum lasers is demonstrated to perform spectrally resolved, broadband frequency response characterization of photodetectors in the NIR Band. In contrast to existing techniques, this method allows for a simple system to achieve the goal, requiring just a standard continuous wave(CW) high-power fiber laser source and an RF spectrum analyzer. From our recent work, we summarize methods to easily convert any high-power fiber laser into a CW supercontinuum. These sources in the time domain exhibit interesting properties all the way down to the femtosecond time scale. This enables measurement of broadband frequency response of photodetectors while the wide optical spectrum of the supercontinuum can be spectrally filtered to obtain this information in a spectrally resolved fashion. The method involves looking at the RF spectrum of the output of a photodetector under test when incident with the supercontinuum. By using prior knowledge of the RF spectrum of the source, the frequency response can be calculated. We utilize two techniques for calibration of the source spectrum, one using a prior measurement and the other relying on a fitted model. Here, we characterize multiple photodetectors from 150MHz bandwidth to >20GHz bandwidth at multiple bands in the NIR region. We utilize a supercontinuum source spanning over 700nm bandwidth from 1300nm to 2000nm. For spectrally resolved measurement, we utilize multiple wavelength bands such as around 1400nm and 1600nm. Interesting behavior was observed in the frequency response of the photodetectors when comparing broadband spectral excitation versus narrower band excitation.

Paper Details

Date Published: 20 February 2018
PDF: 6 pages
Proc. SPIE 10513, Components and Packaging for Laser Systems IV, 105131O (20 February 2018); doi: 10.1117/12.2289494
Show Author Affiliations
Vishal Choudhury, Indian Institute of Science (India)
Roopa Prakash, Indian Institute of Science (India)
K. P. Nagarjun, Indian Institute of Science (India)
V. R. Supradeepa, Indian Institute of Science (India)


Published in SPIE Proceedings Vol. 10513:
Components and Packaging for Laser Systems IV
Alexei L. Glebov; Paul O. Leisher, Editor(s)

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