High resolution laser LIDAR utilising two-section distributed feedback semiconductor laser as a coherent source

Burrows, E.C.; Liou, K.‐Y.

doi:10.1049/el:19900378

Cited by 35 publications

(13 citation statements)

References 3 publications

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“…The key component of an FMCW imaging system is therefore a broadband and precisely controllable swept frequency source. The wide gain bandwidth of the semiconductor quantum well media, the narrow linewidth of a single mode semiconductor laser (SCL), and the ability to electronically control the lasing frequency using the injection current make the SCL an attractive candidate for a wideband swept-frequency source for FMCW imaging [4][5][6][7]. However, the bandwidth and the speed of demonstrated linear frequency sweeps have been limited by the inherent non-linearity of the frequency modulation response of the SCL vs. the injection current, especially at high speeds.…”

Section: Introductionmentioning

confidence: 99%

Precise control of broadband frequency chirps using optoelectronic feedback

et al. 2009

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Abstract:We demonstrate the generation of wideband frequency sweeps using a semiconductor laser in an optoelectronic feedback loop. The rate and shape of the optical frequency sweep is locked to and determined by the frequency of a reference electronic signal, leading to an agile, high coherence swept-frequency source for laser ranging and 3-D imaging applications. Using a reference signal of constant frequency, a transformlimited linear sweep of 100 GHz in 1 ms is achieved, and real-time ranging with a spatial resolution of 1.5 mm is demonstrated. Further, arbitrary frequency sweeps can be achieved by tuning the frequency of the input electronic signal. Broadband quadratic and exponential optical frequency sweeps are demonstrated using this technique.

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Section: Introductionmentioning

confidence: 99%

Precise control of broadband frequency chirps using optoelectronic feedback

et al. 2009

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“…The ideal source should operate in single mode and have long coherence length and high output power. Submicrometer resolution over shorter distances has been reported by some authors, 6 and others have achieved a maximum range of more then 18 km. 7 The modulation of the optical frequency can often be realized by modulating a current to the modulation section of the laser.…”

Section: Laser Sources System and Performancementioning

confidence: 73%

Using a discrete thermal model to obtain a linear frequency ramping in a frequency-modulated continuous-wave system

Nordin

Hyyppä

2005

Opt. Eng

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Abstract. The lasing wavelength of a single-section distributed feedback ͑DFB͒ laser diode can be modulated by modulating the drive current. This makes it possible to utilize the DFB laser diode in a frequencymodulated continuous wave ͑FMCW͒ range and velocity measuring system. In FMCW, the frequency of the laser is ramped, and the frequency difference between the reflected wave and a local-oscillator wave is monitored. For maximum performance the frequency ramping should be linear. Due to thermal phenomena, a linear ramping of the current seldom results in a linear ramping of the optical frequency. We have derived a discrete thermal model, using resistors and capacitors, of our laser module. The thermal model was then used as a starting point to model the frequency behavior of the laser and to derive modulation currents that resulted in a linear frequency ramping at some different modulation frequencies. © 2005 Society of Photo-Optical Instrumentation Engineers.

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“…Among these, two representative applications will be discussed briefly. A most promising application with a significant performance gain by using wavelength tunable laser diodes is the optical radar technique for distance measurements [9,10,11]. Due to the large frequency tuning range of several hundred GHz in the optical domain, one can expect an appreciably improved resolution as compared to microwave radar, particularly at short distances [12,13,14].…”

Section: Applications For Wavelength Tunable Laser Diodesmentioning

confidence: 99%

Wavelength Tunable Laser Diodes and Their Applications

Amann¹

1995

Trends in Optical Fibre Metrology and Standards

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Single mode laser diodes with an electronically tunable wavelength are among the key components needed for advanced applications in optical communications, measurement and sensing. In particular, these devices may be used as wavelength controllable transmitters in wavelength division multiplexing or as local oscillators in optical receivers using the coherent detection technique. Furthermore, distance measurements with a high accuracy and large repetition frequency as well as threedimensional viewing are feasible using the frequency modulated continuous wave radar technique in the optical domain. Also numerous measurement techniques in optoelectronics and fiber optics can be performed by means of wavelength tunable lasers. This paper reviews the recent progress made on electronically wavelength tunable laser diodes in the InGaAsP material system at 1.5 11m wavelength. The operation principles and technological approaches of the various device concepts are presented and the laser parameters relevant for anticipated applications, such as tuning range, spectral linewidth and wavelength access, are discussed.The continuous and discontinuous tuning modes are introduced, compared and the physical limitations with respect to the maximum tuning ranges are commented on. Particular attention is paid to device handling and the effort needed for wavelength control which are most important for practical applications.

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High resolution laser LIDAR utilising two-section distributed feedback semiconductor laser as a coherent source

Cited by 35 publications

References 3 publications

Precise control of broadband frequency chirps using optoelectronic feedback

Precise control of broadband frequency chirps using optoelectronic feedback

Using a discrete thermal model to obtain a linear frequency ramping in a frequency-modulated continuous-wave system

Wavelength Tunable Laser Diodes and Their Applications

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