Intensity modulated digital optical communications using a frequency modulated signal laser

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5416629
SERIAL NO

07985184

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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In long distance digital and frequency modulation systems that use optical sources having optical frequency chirp, degradation due to optical dispersion in the transmission fiber is overcome by filtering the laser wavelength representative of one of the binary levels (e.g., binary '0'). An optical source such as a DFB laser is directly frequency modulated by a digital data stream. A first digital level is represented by a first intensity of the modulated carrier corresponding to a carrier wavelength .lambda..sub.1 and a second digital level is represented by a second intensity of the modulated carrier corresponding to a carrier wavelength .lambda..sub.2. A wavelength selective reflector is used to filter the wavelength .lambda..sub.1 from the modulated carrier. The modulated carrier, from which wavelength .lambda..sub.1 has been filtered, is then coupled to an optical communication path for transmission. In one embodiment the wavelength selective reflector is coupled to the laser output using an optical circulator. In another embodiment, a directional coupler is used.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
GENERAL INSTRUMENT CORPORATION (GIC-4)HORSHAM, PA63
LEVEL 3 COMMUNICATIONS, LLCBROOMFIELD, CO644

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Huber, David R Warrington, PA 46 3014

Cited Art Landscape

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Patent Citation Ranking

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