Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Approach for Microwave Frequency Measurement Based on a Single Photonic Chip Combined with a Phase Modulator and Microring Resonator

  • Zhang, Jiahong (Faculty of Information Engineering and Automation, Kunming University of Science and Technology) ;
  • Zhu, Chuyi (Faculty of Information Engineering and Automation, Kunming University of Science and Technology) ;
  • Yang, Xiumei (Faculty of Information Engineering and Automation, Kunming University of Science and Technology) ;
  • Li, Yingna (Faculty of Information Engineering and Automation, Kunming University of Science and Technology) ;
  • Zhao, Zhengang (Faculty of Information Engineering and Automation, Kunming University of Science and Technology) ;
  • Li, Chuan (Faculty of Information Engineering and Automation, Kunming University of Science and Technology)
  • Received : 2018.08.08
  • Accepted : 2018.11.04
  • Published : 2018.12.25
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Abstract

A new approach for identification of a microwave frequency using an integrated optical waveguide chip, combined with a phase modulator (PM) and two microring resonators (MRRs), is proposed, theoretically deduced, and verified. By wavelength tuning to set the PM under the condition of a double side band (DSB), the measurement range can be started from the dc component, and the measurement range and response slope can be adjusted by designing the radius and transmission coefficient of the MRR. Simulations reveal that the amplitude comparison function (ACF) has a monotonic relationship from dc to 32.5 GHz, with a response slope of 5.15 dB under conditions of DSB modulation, when the radius values, transmission coefficients, and the loss factors are designed respectively as $R_1=400{\mu}m$, $R_2=600{\mu}m$, $t_1=t_2=0.63$, and ${\gamma}_1={\gamma}_2=0.66$. Theoretical calculations and simulation results both indicate that this new approach has the potential to be used for measuring microwave frequencies, with the advantages of compact structure and superior reconfigurability.

Keywords

KGHHD@_2018_v2n6_576_f0001.png 이미지

FIG. 1. Schematic diagram of the proposed IFM approach: fm, the microwave frequency to be measured; PMF, polarization maintaining fiber; SMF, single mode fiber; PD, photodetector; PC, personal computer.

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FIG. 2. Response of the two photonic MRRs, under the four modulation conditions: (a) optical carrier suppression (OCS), (b) double side band (DSB), (c) upper side band (USB), (d) lower side band (LSB).

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FIG. 3. Response of the designed MRRs for (a) t = 0.63 and (b) t = 0.75.

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FIG. 4. MRR frequency responses together with the ACF, under modulation conditions of (a) OCS, (b) DSB, (c) USB, and (d) LSB.

TABLE 1. Simulation results for the proposed IFM approach

KGHHD@_2018_v2n6_576_t0001.png 이미지

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