TY - JOUR
T1 - Wideband High-Speed and High-Accuracy Instantaneous Frequency Measurement System
AU - Huang, Chongjia
AU - Chan, Erwin Hoi Wing
AU - Hao, Peng
AU - Wang, Xudong
N1 - Publisher Copyright:
© 2009-2012 IEEE.
PY - 2023/6/1
Y1 - 2023/6/1
N2 - A new photonic-assisted instantaneous frequency measurement system is presented. It overcomes the latency problem in the reported structures based on the frequency-to-time mapping technique or the frequency-to-power mapping technique that involves a long length of fiber, and at the same time, enables the incoming microwave signal frequency to be measured over a wide frequency range with only small errors. The system generates three low-frequency signals. The phases of the three low-frequency signals are compared. One of the two low-frequency signal phase differences is used to estimate the incoming microwave signal frequency unambiguously over a wide frequency range and the other is used to provide accurate microwave signal frequency measurement. A proof-of-concept experiment is set up. Experimental results show, by measuring the phase difference of two low-frequency signals, the frequency of the input microwave signal can be determined unambiguously in 15 GHz and 500 MHz frequency ranges with errors below ±220 MHz and ±10 MHz respectively. Hence, by using two low-frequency signal phase differences, the input microwave signal frequency can be determined accurately over a wide frequency range. The new photonic-assisted frequency measurement system has a fast response time, which is an order of magnitude shorter than that of the systems based on the frequency-to-time mapping technique and the frequency-to-power mapping technique with a kilometer-long fiber.
AB - A new photonic-assisted instantaneous frequency measurement system is presented. It overcomes the latency problem in the reported structures based on the frequency-to-time mapping technique or the frequency-to-power mapping technique that involves a long length of fiber, and at the same time, enables the incoming microwave signal frequency to be measured over a wide frequency range with only small errors. The system generates three low-frequency signals. The phases of the three low-frequency signals are compared. One of the two low-frequency signal phase differences is used to estimate the incoming microwave signal frequency unambiguously over a wide frequency range and the other is used to provide accurate microwave signal frequency measurement. A proof-of-concept experiment is set up. Experimental results show, by measuring the phase difference of two low-frequency signals, the frequency of the input microwave signal can be determined unambiguously in 15 GHz and 500 MHz frequency ranges with errors below ±220 MHz and ±10 MHz respectively. Hence, by using two low-frequency signal phase differences, the input microwave signal frequency can be determined accurately over a wide frequency range. The new photonic-assisted frequency measurement system has a fast response time, which is an order of magnitude shorter than that of the systems based on the frequency-to-time mapping technique and the frequency-to-power mapping technique with a kilometer-long fiber.
KW - fiber optics links and subsystems
KW - Frequency measurement
KW - microwave measurement
KW - Microwave measurement
KW - Modulation
KW - Optical fibers
KW - Optical polarization
KW - Optical reflection
KW - Optical signal processing
KW - Radio frequency
KW - radio frequency photonics
UR - http://www.scopus.com/inward/record.url?scp=85153405148&partnerID=8YFLogxK
U2 - 10.1109/JPHOT.2023.3267143
DO - 10.1109/JPHOT.2023.3267143
M3 - Article
AN - SCOPUS:85153405148
SN - 1943-0655
VL - 15
SP - 1
EP - 8
JO - IEEE Photonics Journal
JF - IEEE Photonics Journal
IS - 3
M1 - 7100408
ER -