Interferometric noise reduction in fiber-optic links by superposition of high frequency modulation

The reduction of interferometric noise by superposition of high frequency modulation is analyzed. It is shown that the nature of this reduction is due to a redistribution of noise energy from baseband to higher frequencies where it can be discarded by low-pass filtering. Detailed analysis revealed the dependence of the noise reduction factor on the product f/sub 0 tau /, and the modulation index of the high frequency superimposed modulation. The proper choice of parameters can lead to complete elimination of the converted phase noise from the system. >

[1]  H. E. Rowe,et al.  Signals and Noise in Communication Systems , 1965 .

[2]  J. Armstrong,et al.  Theory of Interferometric Analysis of Laser Phase Noise , 1966 .

[3]  W. Harth.  Large-signal direct modulation of injection lasers , 1973 .

[4]  Klaus Petermann,et al.  Semiconductor laser noise in an interferometer system , 1981 .

[5]  Joseph W. Goodman,et al.  Spectral Structure Of Phase-Induced Intensity Noise In Recirculating Delay Lines , 1983, Other Conferences.

[6]  R. Epworth,et al.  Reproducible modal noise measurements in system design and analysis , 1983 .

[7]  L. Ewell,et al.  Increased received power and decreased modal noise by preferential excitation of low-order modes in multimode optical-fiber transmission systems , 1986 .

[8]  B. Moslehi.  Noise power spectra of optical two-beam interferometers induced by the laser phase noise , 1986 .

[9]  D. Renner,et al.  Long-wavelength semiconductor lasers , 1987, IEEE Journal of Quantum Electronics.

[10]  Leonid G. Kazovsky,et al.  Interferometric conversion of laser phase noise to intensity noise by single-mode fibre-optic components , 1987 .

[11]  Niloy K. Dutta,et al.  Long wavelength semiconductor lasers , 1988, Technical Digest., International Electron Devices Meeting.

[12]  N. Cheung,et al.  Effects of phase-to-intensity noise conversion by multiple reflections on gigabit-per-second DFB laser transmission systems , 1989 .

[13]  N. Cheung,et al.  Observation of equivalent Rayleigh scattering mirrors in lightwave systems with optical amplifiers , 1990, IEEE Photonics Technology Letters.

[14]  M. Tur,et al.  Phase-induced intensity noise in optical interferometers excited by semiconductor lasers with non-Lorentzian lineshapes , 1990 .