Microwave photonics instantaneous frequency measurement receiver based on a Sagnac loop

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 functi...

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Bibliographic Details
Published in:Optics letters 2018-05, Vol.43 (10), p.2233-2236
Main Authors: Emami, Hossein, Hajihashemi, Mohammadreza, Alavi, Sayed Ehsan, Supaat, Abu Sahmah Mohd
Format: Article
Language:English
Subjects:
Bias
Electrical noise
Electronic warfare
Electronics
Error analysis
IFM receivers
Microwave photonics
Phase modulation
Photonics
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Summary: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.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.43.002233