Journal
OPTICS LETTERS
Volume 43, Issue 10, Pages 2233-2236Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.43.002233
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Funding
- Research University grant of Universiti Teknologi Malaysia (UTM) [GUP 17H57]
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A microwave photonics instantaneous frequency measurement receiver was conceived and practically demonstrated. The system is based on phase modulation inside a Sagnac loop and therefore needs no bias voltage, resulting in no DC bias drifts. The system provides a DC output whose amplitude is a function of input signal frequency, and thus no high-frequency photo-detector is required. Furthermore, the system exhibits a very good sensitivity without the aid of any sort of electrical noise cancellation techniques, such as lock-in amplification. This makes the system response faster, which would be another benefit for electronic warfare applications. Less than 6% measurement error was achieved over a 0.01-40 GHz frequency range for -30 dBm RF level. Also, a 10% error was achieved at -51 dBm RF power level. (C) 2018 Optical Society of America
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