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Photonics Research, Volume. 8, Issue 8, 1360(2020)

Reconfigurable time-stretched swept laser source with up to 100 MHz sweep rate, 100 nm bandwidth, and 100 mm OCT imaging range Editors' Pick

Dongmei Huang1,2, Feng Li1,2、*, Chao Shang2,3,4, Zihao Cheng1,2, and P. K. A. Wai1,2
Author Affiliations
  • 1Photonics Research Centre, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China
  • 2The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China
  • 3Photonics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong SAR, China
  • 4Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Science, Beijing Jiaotong University, Beijing 100044, China
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    Experimental setup of the swept laser. WDM, wavelength division multiplexer; EDF, erbium-doped fiber; PBS, polarizing beam splitter; Components, Faraday rotator, wave plate, and polarizing beam splitter; OC, optical coupler; EDFA, erbium-doped fiber amplifier; VOA, variable optical attenuator; PC, polarization controller; PPG, pulse/pattern generator; MOD, optical modulator; CFBG, chirped fiber Bragg grating; DCF, dispersion compensation fiber; PD, photodetector; OSA, optical spectrum analyzer; OSC, oscilloscope.

    Fig. 1. Experimental setup of the swept laser. WDM, wavelength division multiplexer; EDF, erbium-doped fiber; PBS, polarizing beam splitter; Components, Faraday rotator, wave plate, and polarizing beam splitter; OC, optical coupler; EDFA, erbium-doped fiber amplifier; VOA, variable optical attenuator; PC, polarization controller; PPG, pulse/pattern generator; MOD, optical modulator; CFBG, chirped fiber Bragg grating; DCF, dispersion compensation fiber; PD, photodetector; OSA, optical spectrum analyzer; OSC, oscilloscope.

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    Schematic diagram of the point spread function and imaging range measurement system. SOA, semiconductor optical amplifier; OSC, oscilloscope; OC, optical coupler; BPD, balanced photodetector; CIR, circulator; PC, polarization controller; VODL, variable optical delay line.

    Fig. 2. Schematic diagram of the point spread function and imaging range measurement system. SOA, semiconductor optical amplifier; OSC, oscilloscope; OC, optical coupler; BPD, balanced photodetector; CIR, circulator; PC, polarization controller; VODL, variable optical delay line.

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    Output performance of the mode-locked laser. (a) Spectrum, (b) pulse train, and (c) autocorrelation trace of the femtosecond laser source.

    Fig. 3. Output performance of the mode-locked laser. (a) Spectrum, (b) pulse train, and (c) autocorrelation trace of the femtosecond laser source.

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    Output performance of the 100 MHz swept source by time stretching in a CFBG. (a) The reflectivity, input, and output spectra of the CFBG used in experiment. (b) The output stretched waveform from the CFBG. (c) Filtered spectra and (d) waveforms of the swept signal when the central wavelength is tuned from 1525 to 1575 nm. (e) The swept trace λ(t) obtained from (c) and (d) with parabolic fitting of t(λ). (f) Roll-off performance of the SS-OCT with PSFs measured at different optical delays. (g) OCT axial resolution in air.

    Fig. 4. Output performance of the 100  MHz swept source by time stretching in a CFBG. (a) The reflectivity, input, and output spectra of the CFBG used in experiment. (b) The output stretched waveform from the CFBG. (c) Filtered spectra and (d) waveforms of the swept signal when the central wavelength is tuned from 1525 to 1575 nm. (e) The swept trace λ(t) obtained from (c) and (d) with parabolic fitting of t(λ). (f) Roll-off performance of the SS-OCT with PSFs measured at different optical delays. (g) OCT axial resolution in air.

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    Output performance of the 25 MHz swept source by time stretching in DCF. (a) The output spectrum of swept source with a reconfigured sweep rate of 25 MHz. (b) The waveforms before and after time stretching in DCF. (c) The swept trace λ(t) with parabolic fitting from 1525 to 1605 nm. (d) Roll-off performance of the SS-OCT with PSFs measured at different optical delays. (e) OCT axial resolution in air.

    Fig. 5. Output performance of the 25 MHz swept source by time stretching in DCF. (a) The output spectrum of swept source with a reconfigured sweep rate of 25 MHz. (b) The waveforms before and after time stretching in DCF. (c) The swept trace λ(t) with parabolic fitting from 1525 to 1605 nm. (d) Roll-off performance of the SS-OCT with PSFs measured at different optical delays. (e) OCT axial resolution in air.

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    Output performance of 2.5 MHz swept source by time stretching in DCF. (a) The output spectrum of the swept source with a reconfigured sweep rate of 2.5 MHz. (b) The waveforms before and after time stretching in DCF. (c) The swept trace λ(t) with parabolic fitting from 1525 to 1605 nm. (d) Roll-off performance of the SS-OCT with PSFs measured at different optical delays. (e) OCT axial resolution in air.

    Fig. 6. Output performance of 2.5 MHz swept source by time stretching in DCF. (a) The output spectrum of the swept source with a reconfigured sweep rate of 2.5 MHz. (b) The waveforms before and after time stretching in DCF. (c) The swept trace λ(t) with parabolic fitting from 1525 to 1605 nm. (d) Roll-off performance of the SS-OCT with PSFs measured at different optical delays. (e) OCT axial resolution in air.

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    • Table 1. Performance of Swept Laser Sources with Different Configurations

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      Table 1. Performance of Swept Laser Sources with Different Configurations

      Sweep RateDispersion ElementPulse FWHM10 dB BandwidthSensitivityAxial Resolution6 dB Roll-Off Length
      100 MHzCFBG, −10 km G.652, −165 ps/nm8.4 ns49.7 nm80 dB36 μm5.7 mm
      25 MHzDCF, −20 km G.652, −322 ps/nm23.9 ns95 nm77 dB25 μm13.6 mm
      2.5 MHzDCF, −200 km G.652, −3306  ps/nm214.2 ns75 nm95 dB22 μm111 mm
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    Dongmei Huang, Feng Li, Chao Shang, Zihao Cheng, P. K. A. Wai, "Reconfigurable time-stretched swept laser source with up to 100 MHz sweep rate, 100 nm bandwidth, and 100 mm OCT imaging range," Photonics Res. 8, 1360 (2020)

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    Paper Information

    Category: Lasers and Laser Optics

    Received: Feb. 7, 2020

    Accepted: Jun. 17, 2020

    Published Online: Aug. 6, 2020

    The Author Email: Feng Li (enlf@polyu.edu.hk)

    DOI:10.1364/PRJ.390076

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology