US Patent No: 5,416,629

Number of patents in Portfolio can not be more than 2000

Intensity modulated digital optical communications using a frequency modulated signal laser

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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
LEVEL 3 COMMUNICATIONS, LLCBROOMFIELD, CO428

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Huber, David R Annapolis, MD 49 2891

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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EZCONN CORPORATION (1)
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VERIZON LABORATORIES INC. (1)
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Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
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XTERA COMMUNICATIONS, INC. (11)
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THE REGENTS OF THE UNIVERSITY OF MICHIGAN (6)
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6,115,403 Directly modulated semiconductor laser having reduced chirp 71 1997
 
Clark-MXR, Inc. (1)
5,572,355 Optical system for stretching, compressing and amplifying ultrashort optical pulses 14 1995
 
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7,436,871 Method and device for performing wavelength modulation with Distributed Bragg Reflector (DBR) laser 0 2004
 
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LUCENT TECHNOLOGIES INC. (1)
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MR. STEVEN Z. JURISTA (1)
7,747,171 Method and apparatus for alleviating slope-induced impairments to chirped optical signals propagating in an optical transmission system 0 2002
 
NOLA SEMICONDUCTOR LLC (1)
6,546,160 Transceiver for wavelength multiplexing processes 4 2000
 
OPTICAL HORIZONS CORPORATION (1)
6,963,685 Power source for a dispersion compensation fiber optic system 59 2002
 
Other [Check patent profile for assignment information] (2)
6,104,851 Transmission system comprising a semiconductor laser and a fiber grating discriminator 64 1998
8,792,531 Optical beam steering for tunable laser applications 0 2008

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