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Chin. Phys. B, 2022, Vol. 31(4): 044202    DOI: 10.1088/1674-1056/ac40ff

Switchable instantaneous frequency measurement by optical power monitoring based on DP-QPSK modulator

Yu-Lin Zhu(朱昱琳), Bei-Lei Wu(武蓓蕾), Jing Li(李晶), Mu-Guang Wang(王目光), Shi-Ying Xiao(肖世莹), and Feng-Ping Yan(延凤平)
Institute of Lightwave Technology, Key Laboratory of All Optical Network and Advanced Telecommunication of EMC, Beijing Jiaotong University, Beijing 100044, China
Abstract  We propose and analyze an instantaneous frequency measurement system by using optical power monitoring technique with improved resolution. The primary component adopted in the proposal is a dual-polarization quadrature phase shift keying (DP-QPSK) modulator which is used to modulate the microwave signal that has a designed time delay and phase shifting. The generated optical signal is sent to polarization beam splitter (PBS) in DP-QPSK modulator. Owing to the complementary transmission nature of polarization interference introduced by PBS, the frequency information is converted into the optical power and the relationship between the amplitude comparison function (ACF) and microwave frequency to be measured is established. Thus, the frequency of the microwave signal can be easily measured through monitoring the optical powers of the two output ports of the PBS. Furthermore, by adjusting the direct current (DC) biases of the DP-QPSK modulator instead of changing the electrical delay, the measurement range and resolution can be switched. In this paper, the basic principle of the instantaneous frequency measurement system is derived in detail, and simulation has been performed to investigate the resolution, the measurement range, and the influence of imperfection devices. The proposed scheme is wavelength-independent and its measurement range is switchable, which can avoid the laser wavelength drifting problem and thus greatly increasing the system flexibility.
Keywords:  microwave photonics      DP-QPSK modulator      instantaneous frequency measurement  
Received:  23 June 2021      Revised:  06 October 2021      Accepted manuscript online:  08 December 2021
PACS:  42.40.My (Applications)  
  42.79.-e (Optical elements, devices, and systems)  
  42.81.-i (Fiber optics)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61801017, U2006217, 62005011, and 61620106014), Beijing Municipal Natural Science Foundation (Grant No. 4212009) and the Fundamental Research Funds for the Central Universities (Grant No. 2020JBM010).
Corresponding Authors:  Bei-Lei Wu     E-mail:

Cite this article: 

Yu-Lin Zhu(朱昱琳), Bei-Lei Wu(武蓓蕾), Jing Li(李晶), Mu-Guang Wang(王目光), Shi-Ying Xiao(肖世莹), and Feng-Ping Yan(延凤平) Switchable instantaneous frequency measurement by optical power monitoring based on DP-QPSK modulator 2022 Chin. Phys. B 31 044202

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