Optical: systems and elements – Prism – With reflecting surface
Patent
1993-01-29
1994-12-06
Goldstein, Herbert
Optical: systems and elements
Prism
With reflecting surface
359154, 359182, H04B 1012
Patent
active
053716256
ABSTRACT:
When digital signals are transmitted over optical fibers (3), which have a considerable chromatic dispersion at the wavelength being used, the length of the transmission path is very limited when the digital signal to be transmitted is converted into an optical signal by means of intensity modulation. If frequency modulation (also called FSK=Frequency Shift Keying) is used instead of the intensity modulation, the bridgeable path can be greatly increased, but requires a suitable optical receiver at the receiving end. The invention utilizes a simple optical receiver (4), which is not sensitive to frequency modulation, but to intensity modulation. This is possible, because an intensity variation is created, due to the chromatic dispersion of the optical fiber (3) and the resulting running time differences of signal portions at different wavelengths (.lambda..sub.0, .lambda..sub.1) from the initial frequency modulation during the transmission over the optical fiber (3), which process is contained in the digital signal.
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Mittrich Martin
Wedding Berthold
ALCATEL N.V.
Goldstein Herbert
Negash Kinfe-Michael
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