Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1993-08-18
1996-08-27
Boudreau, Leo
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359161, H04B 1004
Patent
active
055506674
ABSTRACT:
A laser (2) of an optical transmitter (1) for the transmission of an analog broadband signal for CATV in particular, can be amplitude-modulated in two different manners with an intelligence signal (N). Direct modulation can lead to an undesired additional frequency modulation. With indirect modulation by means of an optical intensity modulator (3), Brillouin scattering occurs at powers of approximately 10 mW in an optical fiber of the transmission path connected to the optical transmitter (1). Both modulations lead to distortions of the transmitted signal. In order to avoid the disadvantages of both modulations in a technically simple fashion, the carrier emitted from a laser (2) is indirectly modulated with an intelligence signal (N) and the laser (2) also faintly directly modulated with an energy-dispersing signal (V). The faint direct modulation leads to a constant, limited wave length alteration of the optical signal, such that Brillouin scattering is reduced, simultaneously with the avoidance of dispersion distortions.
REFERENCES:
patent: 5210633 (1993-05-01), Trisno
patent: 5293545 (1994-03-01), Huber
patent: 5315426 (1994-05-01), Aoki
patent: 5327279 (1994-07-01), Farina et al.
G. E. Bodeep et al "Semiconductor Lasers Versus External Modeulators: A Comparison of Nonlinear Distortion for Lightwaves Sub-carrier CATV Applications", IEEE Photonics Technology Letters, vol. 1, No. 11, Nov. 1989, pp. 401-403.
D. Cotter et al "Suppression of Stimulated Brillouin Scattering During Transmission of High-Powered Narrowband Laser Light in Monomode Fibre", Electronics Letters, 22nd Jul. 1982, vol. 18, No. 15, pp. 638-640.
Bulow Henning
Heidemann Rolf
Krimmel Heinz
Otterbach Jurgen
ALCATEL N.V.
Boudreau Leo
Negash Kinfe-Michael
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