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Improved peak power method for measuring frequency responses of photodetectors in a self‐heterodyne system

An improved peak power method for measuring frequency responses of photodetectors in a self‐heterodyne system consisting of a distributed Bragg reflector laser is proposed.The time‐resolved spectrum technique is used to measure the peak power of the beat signal and the intrinsic linewidth of beat signal for calibration. The experimental results show that the impact of the thermal‐induced frequency drift, which is the main reason for producing an error in measurement by conventional peak power method and spectrum power method, can be removed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2199–2203, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25448