Current Optics and Photonics

Optical Society of Korea (한국광학회)
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X-band Microwave Photonic Filter Using Switch-based Fiber-Optic Delay Lines

  • Received : 2017.10.17
  • Accepted : 2017.11.21
  • Published : 2018.02.25
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Abstract

An X-band microwave photonic (MWP) filter using switch-based fiber-optic delay lines has been proposed and experimentally demonstrated. It is composed of two electro-optic modulators (EOMs) and $2{\times}2$ optical MEMS-switch-based fiber-optic delay lines. By changing time-delay difference and coefficients of each wavelength signal by using fiber-optic delay lines and an electro-optic modulator, respectively, a bandpass filter or a notch filter can be implemented. For an X-band MWP filter with four channel elements, fiber-optic delay lines with the unit time-delay of 50 ps have been experimentally realized and the frequency responses corresponding to the time-delays has been measured. The measured frequency response error at center frequency and the time-delay difference error were 180 MHz at 10 GHz and 3.2 ps, respectively, when the fiber-optic delay line has the time-delay difference of 50 ps.

Keywords

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FIG. 1. Schematic diagram of the proposed fiber optic delay line based microwave photonic filter with negative or positive coefficients.

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FIG. 2. Experimental setup for the frequency response measurement of the proposed microwave photonic filter.

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FIG. 3. Measured waveforms with time-delay difference generated by the fiber optic delay line (a) CROSS-BAR state (b) BAR-CROSS state. The EOM1 and EOM2 are biased at 2.0 V.

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FIG. 4. The frequency responses of the proposed filter when VEOM1 = 2.0 V, VEOM2 = 4.0 V and the columns of the fiber optic delay line are in the (a) CROSS-BAR states (b) BAR-CROSS states (c) CROSS-CROSS states. Theory (solid line) and Experiment (dot).

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FIG. 5. The frequency responses of the proposed filter when VEOM1 = 2.0 V, VEOM2 = 2.0 V and the columns of the fiber optic delay line are in the (a) CROSS-BAR states (b) BAR-CROSS states (c) CROSS-CROSS states. Theory (solid line) and Experiment (hole).

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