• Title/Summary/Keyword: Wavelength-Swept Fiber Laser

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Broadband Wavelength-swept Raman Laser for Fourier-domain Mode Locked Swept-source OCT

  • Lee, Hyung-Seok;Jung, Eun-Joo;Jeong, Myung-Yung;Kim, Chang-Seok
    • Journal of the Optical Society of Korea
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    • v.13 no.3
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    • pp.316-320
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    • 2009
  • A novel broadband wavelength-swept Raman laser was used to implement Fourier-domain mode locked (FDML) swept-source optical coherence tomography (SS-OCT). Instead of a conventional semiconductor optical amplifier, this study used broadband optical fiber Raman amplification, over 50 nm centered around 1545 nm, using a multi-wavelength optical pumping scheme, which was implemented with the four laser diodes at the center wavelengths of 1425, 1435, 1455 and 1465 nm, respectively, and the maximum operating power of 150 mW each. The operating swept frequency of the laser was determined to 16.7 kHz from the FDML condition of 12 km optical fiber in the ring cavity. The OCT images were obtained using the novel broadband wavelengthswept Raman laser source.

Development of Wavelength Swept Laser by using the two SOAs parallel configuration (SOA 2개의 병렬연결을 통한 파장 가변 레이저 개발)

  • Kim, Hoon-Sup;Eom, Jin-Seob
    • Journal of Industrial Technology
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    • v.28 no.B
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    • pp.235-238
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    • 2008
  • In this paper, we have developed wavelength swept laser system for the swept source optical coherence tomography(SS-OCT). A laser is constructed by using the two SOAs parallel configuration, fiber Fabry-Perot tunable filter(FFP-TF). The wavelength sweeps are repetitively generated with the repetition period of 50Hz. The wavelength tuning range of the laser is more than FWHM of 80nm centered at the wavelength of 1310nm and the line-width of the source is 0.12 nm.

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Optical frequency domain reflectometry based on Wavelength swept mode locked fiber laser (Wavelength Swept 모드 록킹된 광섬유 레이저를 이용한 광주파수 영역에서 반사계)

  • 오명숙;박희수;김병윤
    • Proceedings of the Optical Society of Korea Conference
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    • 2003.07a
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    • pp.204-205
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    • 2003
  • We demonstrate a novel OFDR system with compactness and short measurement time based on the use of a wavelength-swept mode-locked fiber laser. The optical source uses an intra-cavity tunable Fabry-Perot filter as a tuning element. The fiber laser sweeps 20 nm in less than 10 ms. Spatial resolution of 100 fm and total measurement range of several centimeters are demonstrate

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Construction of High-Speed Wavelength Swept Mode-Locked Laser Based on Oscillation Characteristics of Fiber Fabry-Perot Tunable Filter (광섬유 패브리-페로 파장가변 필터의 공진특성에 기반한 고속 파장가변 모드잠김 레이저의 제작)

  • Lee, Eung-Je;Kim, Yong-Pyung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.7
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    • pp.1393-1397
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    • 2009
  • A high-speed wavelength swept laser, which is based on oscillation characteristics of a fiber Fabry-Perot tunable filter, is described. The laser is constructed by using a semiconductor optical amplifier, a fiber Fabry-Perot tunable filter, and 3.348 km fiber ring cavity. The wavelength sweeps are repeatatively generated with the repetition period of 61 kHz which is the first parallel oscillation frequency of the Fabry-Perot tunable filter for the low power consumption. Mode-locking is implemented by 3.348 km fiber ring cavity for matching the fundamental of cavity roundtrip time to the sweep period. The wavelength tuning range of the laser is 87 nm(FWHM) and the average output power is 1.284 mW.

Fabrication and Output Characteristics of a High-Speed Wavelength Swept Mode-Locked Laser (고속 파장가변 모드잠김 레이저의 제작 및 출력특성)

  • Lee, Eung-Je;Kim, Yong-Pyung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.6
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    • pp.1117-1121
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    • 2007
  • We demonstrate a wavelength swept mode-locked ring laser for the frequency domain optical coherence tomography(FD OCT). A laser is constructed by using a semiconductor optical amplifier, fiber Fabry-Perot tunable filter and 2.6 km fiber ring cavity. Mode-locking is implemented by 2.6 km fiber ring cavity for matching the fundamental or harmonic of cavity roundtrip time to a sweep period. The wavelength sweeps are repetitively generated with the repetition period of 77.2 kHz which is the parallel resonance frequency of Fabry-Perot tunable filter for the low driving current consumption of the fiber Fabry-Perot tunable filter. The wavelength tuning range of the laser is more than FWHM of 61 nm centered at the wavelength of 1320 nm and the linewidth of the source is $0.014{\pm}0.002$ nm.

Wavelength-Swept Cascaded Raman Fiber Laser around 1300 nm for OCT Imaging

  • Lee, Hyung-Seok;Lee, Hwi Don;Jeong, Myung-Yung;Kim, Chang-Seok
    • Journal of the Optical Society of Korea
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    • v.19 no.2
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    • pp.154-158
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    • 2015
  • We experimentally demonstrated a novel wavelength-swept laser using a cascaded Raman gain around 1310 nm. A 1064/1310 wavelength division multiplexing (WDM) coupler and coupled fiber Bragg gratings mirrors at 1064, 1117, 1175, 1240 nm are effectively used to increase the power efficiency in a laser ring cavity with highly non-linear fiber (HNLF) of 2 km. Linear wavelength sweeping is demonstrated with the 100 Hz triangular driving signal to fiber Fabry-Perot tunable filter (FFP-TF) around the 1310 nm region. The measured sweeping range and output power were 27 nm and 2.1 mW, respectively, which are suitable for optical coherence tomography (OCT) imaging.

Characterization of Wavelength Swept Laser with a Scanning Frequency at 1300 nm (1300 nm 대역 파장 훑음 레이저의 훑음 주파수에 따른 출력 특성)

  • Lee, Byoung-Chang;Oh, Min-Hyun;Jeon, Min-Yong
    • Korean Journal of Optics and Photonics
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    • v.20 no.3
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    • pp.189-194
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    • 2009
  • We demonstrate a ring type wavelength swept laser incorporating a fiber Fabry-Perot tunable filter in a laser cavity using 1300 nm semiconductor optical amplifier as a gain medium. The output characteristics of the wavelength swept laser according to the applied scanning frequencies are analyzed in the temporal and spectral domain. The output of the wavelength swept laser decreases dramatically as the scanning frequency increases. And there is a significant peak power imbalance between the forward scan and the backward scan as the scanning frequency increases. Its use in practical applications might be limited.

Sweeping Automatic Linearization for Wavelength Swept Laser Used in Structure Safety Monitoring (구조물 안전 모니터링용 파장 스위핑 레이저를 위한 스위핑 자동 선형화)

  • Lee, Duk-Kyu;Eom, Jinseob
    • Journal of Sensor Science and Technology
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    • v.29 no.1
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    • pp.51-58
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    • 2020
  • In this study, a novel method for sweeping automatic linearization of wavelength swept laser is proposed. Through the test performed on the implemented laser, the linear sweeping is held up well with a 97% decrease in nonlinearity, and 60 nm sweeping range, 1 kHz sweeping frequency, and 8.8 mW average optical power were obtained. The proposed method uses fiber Bragg grating array, optical-electronic conversion circuit, FPGA embedded module, and a LabVIEW program to generate new compensated wave patterns which were applied to the fiber Fabry-Perot tunable filter. Linear sweeping can reduce the cumbersome and time-consuming recalibration process required for nonlinear sweeping. Additionally, the proposed method provides more accurate measurement results for the structure safety monitoring system.

FBG sensor system for condition monitoring of wind turbine blades (풍력터빈 블레이드 상태 감시용 광섬유격자 센서시스템)

  • Kim, Dae-Gil;Kim, Hyunjin;Song, Minho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.8
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    • pp.75-82
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    • 2013
  • We propose a fiber grating sensor system for condition monitoring of large scale wind turbine blades. For the feasibility test of the proposed sensor system, a down-scaled wind turbine has been constructed and experimented. Fiber grating sensors were attached on a blade surface for distributed strain and temperature measurements. An optical rotary joint was used to transmit optical signals between the FBG sensor array and the signal processing unit. Instead of broadband light source, we used a wavelength-swept fiber laser to obtain high output power density. A spectrometer demodulation is used to alleviate the nonlinear wavelength tuning problem of the laser source. With the proposed sensor system we could measure dynamic strain and temperature profiles at multi-positions of rotating wind turbine blades.

Sweeping Linearization of Wavelength Swept Laser using PID Control (PID 제어를 이용한 파장 스위핑 레이저의 스위핑 선형화)

  • Eom, Jinseob
    • Journal of Sensor Science and Technology
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    • v.29 no.6
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    • pp.412-419
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    • 2020
  • In this study, a PID control method for sweeping automatic linearization of a wavelength swept laser is proposed. First, the closedloop transfer function embodying the PID control is derived. Through the simulation of the function, Kp = 0.022, Ki = 0.008, Kd = 0.002 were obtained as the best PID coefficients for fast linear sweeping. The performance test using the PID coefficients showed that linear sweeping was held up well with a 98.7% decrement in nonlinearity after the 10th feedback, and 45 nm sweeping range, 1 kHz sweeping frequency, and 8.8 mW average optical power were obtained. The equipment consists of a fiber Bragg grating array, an optical-electronic conversion circuit, and a LabVIEW FPGA program. Every 5s, automatic feedback and PID control generate a new compensated waveform and produce a better linear sweeping than before. Compared with nonlinear sweeping, linear sweeping can reduce the cumbersome and time-consuming recalibration processes and produce more accurate measurement results.