Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Tunable Photonic Microwave Delay Line Filter Based on Fabry-Perot Laser Diode

  • Heo, Sang-Hu (Department of Electronic Engineering, Chosun University) ;
  • Kim, Junsu (School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology) ;
  • Lee, Chung Ghiu (Department of Electronic Engineering, Chosun University) ;
  • Park, Chang-Soo (School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology)
  • Received : 2017.12.14
  • Accepted : 2018.01.08
  • Published : 2018.02.25
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Abstract

We report the physical implementation of a tunable photonic microwave delay line filter based on injection locking of a single Fabry-Perot laser diode (FP-LD) to a reflective semiconductor optical amplifier (RSOA). The laser generates equally spaced multiple wavelengths and a single tapped-delay line can be obtained with a dispersive single mode fiber. The filter frequency response depends on the wavelength spacing and can be tuned by the temperature of the FP-LD varying lasing wavelength. For amplitude control of the wavelengths, we use gain saturation of the RSOA and the offset between the peak wavelengths of the FP-LD and the RSOA to decrease the amplitude difference in the wavelengths. From the temperature change of total $15^{\circ}C$, the filter, consisting of four flat wavelengths and two wavelengths with slightly lower amplitudes on both sides, has shown tunability of about 390 MHz.

Keywords

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FIG. 1. Schematic diagram of the proposed PMF.

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FIG. 2. Block diagram for the generation of multiple wavelengths. FP-LD: Fabry-Perot laser diode, RSOA: reflective semiconductor optical amplifier.

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FIG. 3. Optical spectrum after being modified by gain saturation and offset.

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FIG. 4. Experimental Setup (FP-LD: Fabry-Perot laser diode, PC: Polarization controller, RSOA: Reflective semiconductor optical amplifier, EDFA: Erbium-doped fiber amplifier, OBPF: Optical band-pass filter, SMF: Standard single-mode fiber, PD: Photodiode).

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FIG. 5. Measured optical spectra of (a) the FP-LD and (b) the RSOA. The bias currents of the FP-LD and the RSOA are 14.43 mA and 18 mA, respectively.

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FIG. 6. Wavelength tuning and corresponding frequency responses of the proposed PMF with their calculated results (dashed lines) due to temperature control of the FP-LD. (a) and (b): for = 15°C. (c) and (d): for = 20°C. (e) and (f): for = 25°C , (g) and (h): for = 30°C. The center wavelength is shifted by an amount of ~10 nm from 15 to 30°C.

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FIG. 6. Wavelength tuning and corresponding frequency responses of the proposed PMF with their calculated results (dashed lines) due to temperature control of the FP-LD. (a) and (b): for = 15°C. (c) and (d): for = 20°C. (e) and (f): for = 25°C , (g) and (h): for = 30°C. The center wavelength is shifted by an amount of ~10 nm from 15 to 30°C (Continue).

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FIG. 7. Frequency shift of the RF passbands due to temperature control of the FP-LD. The passband numbers are denoted in Fig. 4(b), (d), (f), and (h).

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FIG. 8. Optical filter response for simulation.

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FIG. 9. Simulation of the frequency response for a PMF incorporating unequal wavelength components. Total dispersion:181.22 ps/nm.

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