Results 261 to 270 of about 80,084 (309)
Some of the next articles are maybe not open access.
Phase noise and linewidth in an InGaAsP DFB laser
Journal of Lightwave Technology, 1986Measurements and calculations of interferometrically demodulated phase noise in an InGaAsP DFB laser are reported. The results led to a novel method of laser linewidth measurement. The effect of this noise on a DPSK coherent system is considered.
R. Tkach, A. Chraplyvy
exaly +2 more sources
Laser phase noise reduction for industrial interferometric applications
Applied Optics, 2004Laser ultrasound is a technique used for the ultrasonic inspection of composites during manufacturing of advanced jet fighters. With this technique laser interferometry is used to detect ultrasonic displacements generated by a laser. In theory, the signal-to-noise ratio is proportional to the square root of the collected detection light.
Marc, Dubois +2 more
exaly +3 more sources
Theory of Interferometric Analysis of Laser Phase Noise*
Journal of the Optical Society of America, 1966The line width of a well-stabilized laser operating far above threshold is determined by random fluctuations of the phase. This paper discusses several types of experiments which can give information about the details of this phase random process. In order to study the laser phase noise experimentally the laser signal (containing phase noise only) must
J A Armstrong
exaly +2 more sources
Conversion of laser phase noise to amplitude noise in an optically thick vapor
Journal of the Optical Society of America B: Optical Physics, 1998As laser light propagates through a resonant vapor, laser phase noise (PM) is converted to laser intensity noise (AM) because of the sensitivity of atomic coherence to laser phase fluctuations. In experiments reported here it is shown that this PM-to-AM conversion process is highly efficient and can cause the relative intensity noise of transmitted ...
J C Camparo
exaly +2 more sources
Reducing the phase noise in diode lasers
Optics Letters, 2019Diode lasers are widely used in atomic physics given their narrow linewidth and wavelength tunability. Nevertheless, although they present low noise for their intensity, excessive noise in the phase limits their application in quantum optics. Looking for reduction of this phase noise, we built and characterized a ring laser, using a semiconductor ...
R. L. Rincon Celis, M. Martinelli
openaire +2 more sources
Characterization of phase noise in semiconductor lasers
Applied Physics Letters, 1982Phase noise in semiconductor lasers has been investigated by many authors in the range of low frequencies (<1 MHz). In this letter we present for the first time phase noise measurements extended up to frequencies greater than 1 GHz. Experimental results showing the power spectral density Sφ̇(ω) of the instantaneous frequency φ̇(t) and the ...
S. Piazzolla, P. Spano, M. Tamburrini
openaire +1 more source
Comparison of laser phase and suppression of noise
AIP Conference Proceedings, 1986The sensitivity and accuracy of the usual methods for comparing the phases of two beams of light are affected by the intensity noise of environment and light source, although they can be improved by a lock-in circuit only for a periodic signal.
Xuan-Min Yang, Ming Yi, Zong-Hua Huan
openaire +1 more source
Effects of colored noise on the intensity and phase in a laser system
Physics Letters A, 2001zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Luo, Xiaoqin, Zhu, S., Chen, Xianfeng
openaire +1 more source
Laser Phase Noise Tolerance of Probabilistically-Shaped Constellations
Optical Fiber Communication Conference, 2018We numerically confirmed that required-OSNR gain was obtained by probabilistically-shaped 64/256 QAM compared with uniformly-shaped 16/64 QAM in not only arbitrary white Gaussian noise condition but also in phase noise condition.
Seiji Okamoto +3 more
openaire +2 more sources
Phase noise in semiconductor lasers
Journal of Lightwave Technology, 1986The subject of phase noise in semiconductor lasers is reviewed. The description of noise in lasers and those aspects of phase noise that are relevant to optical communications are emphasized. The topics covered include: Langevin forces; laser linewidth above threshold and below threshold; line structure due to relaxation oscillations; phase ...
openaire +1 more source