Broadband and Remote Electromagnetic Spectrum Sensing Based on Photonic Electric Field Sensor Chip
Round 1
Reviewer 1 Report
The authors have demonstrated a LiNbO3-based photonic electric field sensor chip. The sensor chip can achieve electromagnetic spectrum sensing up to 26.5 GHz. Through using this sensor chip, remote electromagnetic spectrum sensing up to 70 km is demonstrated. The manuscript is well written, and the experimental results are sound. Hence, this manuscript can be accepted for publication in Photonics after some minor revision.
1. In the experiment of remote sensing, the standard electric field is generated by using a TEM cell with a semi-open structure. Hence, the electromagnetic wave cannot be confined in the cell absolutely. How to guarantee that the measured signal is from the sensor chip instead of the free space radiation in the experiment?
2. In the experiment of remote sensing, the measured power should decrease linearly with the increasing fiber length in theory. However, the measured power deviates a little from the theoretical value. What is the main reason?
Author Response
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Reviewer 2 Report
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