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    Ultra-wide frequency response measurement of an optical system with a DC photo-detector

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    Type
    Article
    Authors
    Kuntz, Katanya B.
    Wheatley, Trevor A.
    Song, Hongbin
    Webb, James G.
    Mabrok, Mohamed
    Huntington, Elanor H.
    Yonezawa, Hidehiro
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Date
    2017-01-09
    Online Publication Date
    2017-01-09
    Print Publication Date
    2017-01-23
    Permanent link to this record
    http://hdl.handle.net/10754/622912
    
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    Abstract
    Precise knowledge of an optical device's frequency response is crucial for it to be useful in most applications. Traditional methods for determining the frequency response of an optical system (e.g. optical cavity or waveguide modulator) usually rely on calibrated broadband photo-detectors or complicated RF mixdown operations. As the bandwidths of these devices continue to increase, there is a growing need for a characterization method that does not have bandwidth limitations, or require a previously calibrated device. We demonstrate a new calibration technique on an optical system (consisting of an optical cavity and a high-speed waveguide modulator) that is free from limitations imposed by detector bandwidth, and does not require a calibrated photo-detector or modulator. We use a low-frequency (DC) photo-detector to monitor the cavity's optical response as a function of modulation frequency, which is also used to determine the modulator's frequency response. Knowledge of the frequency-dependent modulation depth allows us to more precisely determine the cavity's characteristics (free spectral range and linewidth). The precision and repeatability of our technique is demonstrated by measuring the different resonant frequencies of orthogonal polarization cavity modes caused by the presence of a non-linear crystal. Once the modulator has been characterized using this simple method, the frequency response of any passive optical element can be determined to a fine resolution (e.g. kilohertz) over several gigahertz.
    Citation
    Kuntz KB, Wheatley TA, Song H, Webb JG, Mabrok MA, et al. (2017) Ultra-wide frequency response measurement of an optical system with a DC photo-detector. Optics Express 25: 573. Available: http://dx.doi.org/10.1364/OE.25.000573.
    Sponsors
    This work was supported financially by the Australian Research Council Centres of Excellence scheme number CE110001027, the Office of Naval Research (ONR), and Industry Canada. The authors would like to thank Greg Milford for lending us the RF signal generator, and Darryl Budarick, Rick Whyte, Shane Brandon, and Mitchell Sinclair for much appreciated technical support. We would also like to thank David Moilanen for fruitful discussions.
    Publisher
    The Optical Society
    Journal
    Optics Express
    DOI
    10.1364/OE.25.000573
    arXiv
    1611.01794
    Additional Links
    https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-2-573
    http://arxiv.org/pdf/1611.01794
    ae974a485f413a2113503eed53cd6c53
    10.1364/OE.25.000573
    Scopus Count
    Collections
    Articles; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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