Utilizing GaalAs Laser Diodes As A Source For Frequency Modulated Continuous Wave (FMCW) Coherent Laser Radars

Slotwinski, A.; Goodwin, F. E.; Simonson, Dana L.

doi:10.1117/12.976378

Cited by 16 publications

(9 citation statements)

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“…1, the range can be calculated from the frequency shift corresponding to the distance according to (1) where is the speed of light, and the output beat frequencies as shown in Fig. 1, and the modulation cycle.…”

Section: A Frequency Modulationmentioning

confidence: 99%

“…This phenomena, usually referred to as the "self-mixing-effect," is due to the fact that the photodiode delivers a current proportional to the squared sum of the two electrical fields w1 and w2. The most common type of lasers used are diode lasers of DFB or DBR type, CO or Nd:YAG [1]- [14]. Systems can be built either as classical open Michelson interferometers or with optical fibers.…”

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confidence: 99%

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Single-stage photodiode op-amp solution suited for a self-mixing fmcw system

Nordin¹,

Hyyppä²

2003

IEEE Trans. Instrum. Meas.

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Abstract-The current delivered by the photodiode in a self-mixing frequency modulated continuous wave or optical frequency domain reflectometry system consists of a dc-current resulting from the local oscillator, the reflected signal, dark current in the photodiode, and current generated from background light. The current also contains the useful harmonic signal with a beat frequency corresponding to the range and radial velocity of a target. To avoid saturation and clipping due to the dc current generated in the photodiode, it is desirable to minimize the gain at dc while maintaining a high gain in the beat frequency region. We have investigated some different solutions and present a modified current-to-voltage converter using bootstrapping and added voltage gain, which addresses this problem using only one OP-amp and no dc shorting inductors.Index Terms-Frequency modulated continuous wave (FMCW), operation amplifier, optical frequency domain reflectometry (OFDR), photodiode, transimpedance amplifier.

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Section: A Frequency Modulationmentioning

confidence: 99%

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confidence: 99%

Single-stage photodiode op-amp solution suited for a self-mixing fmcw system

Nordin¹,

Hyyppä²

2003

IEEE Trans. Instrum. Meas.

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“…Continuously wavelength tunable lasers are also useful for various measurement and sensing applications [6,7,8]. Among these, two representative applications will be discussed briefly.…”

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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“…The mapper computes distance based on the FMCW radar technique using a semiconductor laser operating in a single longitudinal mode as the energy source [7]. The laser is frequency modulated by thennally tuning its wavelength via the injection current which is varied such that the output optical frequency is swept linearly as a function of time.…”

Section: Frequency Modulated Continuous Wave Coherent Laser Radarmentioning

confidence: 99%

<title>Topographic characterization</title>

1993

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The National Aeronautics and Space Administration (NASA), other government agencies, and private industry have requirements to map and analyze 3-dimensional surfaces of varying regularity and material composition. This requires a high fidelity, 3-dimensional description of the work space. In cases where complete and current information about the space is not available, topographic characterization allows on-line initialization and/or modification of the work space database. The mapping environment is often challenging with regard to lighting, radiation, temperature, atmosphere, and causticity. This paper describes a system that provides topographic characterization based on fusing intensity and depth information, and describes the application of this technique for inspection of Shuttle thermal tiles.

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Utilizing GaalAs Laser Diodes As A Source For Frequency Modulated Continuous Wave (FMCW) Coherent Laser Radars

Cited by 16 publications

References 0 publications

Single-stage photodiode op-amp solution suited for a self-mixing fmcw system

Single-stage photodiode op-amp solution suited for a self-mixing fmcw system

Wavelength Tunable Laser Diodes and Their Applications

<title>Topographic characterization</title>

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