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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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
LEVEL 3 COMMUNICATIONS, LLCBROOMFIELD, CO502

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Huber, David R Warrington, PA 46 2963

Cited Art Landscape

Patent Info (Count) # Cites Year
 
TELCORDIA TECHNOLOGIES, INC. (1)
* 4,813,756 Etalon filters for optical channel selection in wavelength division multiplexed fiber systems 55 1988
 
AT&T Bell Laboratories (1)
* 5,048,909 Adiabatic reflection apparatus 50 1990
 
STC PLC (1)
* 4,953,939 Optical fibre transmission systems 63 1987
 
VERIZON LABORATORIES INC. (1)
* 5,105,295 Four level FSK optical signal transmission with optical decoding and direct detection 8 1990
 
EZCONN CORPORATION (1)
* 4,860,294 Integrated-optical arrangement for bidirectional optical message or signal transmission 24 1988
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
AZNA CORPORATION (4)
7,663,762 High-speed transmission system comprising a coupled multi-cavity optical discriminator 13 2002
* 2004/0008,933 High-speed transmission system comprising a coupled multi-cavity optical discriminator 48 2002
7,054,538 Flat dispersion frequency discriminator (FDFD) 47 2003
* 2004/0218,890 Flat dispersion frequency discriminator (FDFD) 1 2003
 
THE REGENTS OF THE UNIVERSITY OF MICHIGAN (6)
6,985,283 Fiber-optic compensation for dispersion, gain tilt, and band pump nonlinearity 5 1999
6,335,820 Multi-stage optical amplifier and broadband communication system 51 1999
6,356,384 Broadband amplifier and communication system 100 2000
6,760,509 SNR booster for WDM systems 2 2001
6,580,548 Broadband amplifier and communication system 5 2001
6,693,738 Broadband amplifier and communication system 4 2001
 
Other [Check patent profile for assignment information] (2)
* 6,104,851 Transmission system comprising a semiconductor laser and a fiber grating discriminator 65 1998
* 2005/0175,356 Multi-ring resonator implementation of optical spectrum reshaper for chirp managed laser technology 52 2004
 
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
 
LUCENT TECHNOLOGIES INC. (2)
6,940,889 Optical pulse source for long haul optical communication systems 1 2002
* 2002/0131,470 Optical pulse source for long haul optical communication systems 0 2002
 
BANDWIDWITH SOLUTIONS, INC. (1)
6,374,006 Chirped period gratings for raman amplification in circulator loop cavities 74 1999
 
CIENA CORPORATION (1)
* 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 15 1995
 
LUMENTUM OPERATIONS LLC (1)
* 5,608,825 Multi-wavelength filtering device using optical fiber Bragg grating 73 1996
 
FINISAR CORPORATION (82)
7,630,425 Optical beam steering for tunable laser applications 14 2004
* 2005/0129,072 Optical beam steering for tunable laser applications 10 2004
7,406,267 Method and apparatus for transmitting a signal using thermal chirp management of a directly modulated transmitter 16 2004
* 2005/0111,852 Method and apparatus for transmitting a signal using thermal chirp management of a directly modulated transmitter 4 2004
7,376,352 Chirp managed laser fiber optic system including an adaptive receiver 15 2004
7,356,264 Chirp managed laser with electronic pre-distortion 14 2004
7,352,968 Chirped managed, wavelength multiplexed, directly modulated sources using an arrayed waveguide grating (AWG) as multi-wavelength discriminator 13 2004
7,280,721 Multi-ring resonator implementation of optical spectrum reshaper for chirp managed laser technology 40 2004
* 2006/0228,120 MULTI-RING RESONATOR IMPLEMENTATION OF OPTICAL SPECTRUM RESHAPER FOR CHIRP MANAGED LASER TECHNOLOGY 1 2004
* 2005/0169,638 Chirp managed laser fiber optic system including an adaptive receiver 4 2004
* 2005/0169,642 Chirp managed laser with electronic pre-distortion 1 2004
7,536,113 Chirp managed directly modulated laser with bandwidth limiting optical spectrum reshaper 12 2005
7,187,821 Carrier suppression using adiabatic frequency modulation (AFM) 15 2005
* 2006/0002,718 Chirp managed directly modulated laser with bandwidth limiting optical spectrum reshaper 40 2005
7,433,605 Adiabatic frequency modulated transmitter with negative chirp 12 2005
* 2005/0286,829 Adiabatic frequency modulated transmitter with negative chirp 1 2005
7,564,889 Adiabatically frequency modulated source 15 2005
* 2006/0018,666 Adiabatically frequency modulated source 38 2005
7,555,225 Optical system comprising an FM source and a spectral reshaping element 13 2005
7,406,266 Flat-topped chirp induced by optical filter edge 19 2005
* 2006/0029,396 Flat-topped chirp induced by optical filter edge 2 2005
7,558,488 Reach extension by using external Bragg grating for spectral filtering 19 2005
* 2005/0271,392 Reach extension by using external bragg grating for spectral filtering 0 2005
7,505,694 Thermal chirp compensation systems for a chirp managed directly modulated laser (CML™) data link 12 2005
* 2006/0078,338 Thermal chirp compensation systems for a chirp managed directly modulated laser (CML.TM.) data Link 13 2005
7,742,542 Phase correlated quadrature amplitude modulation 12 2005
* 2006/0039,502 Phase correlated quadrature amplitude modulation 1 2005
7,477,851 Power source for a dispersion compensation fiber optic system 13 2005
* 2006/0233,556 Power source for a dispersion compensation fiber optic system 38 2005
* 2007/0012,860 Optical source with ultra-low relative intensity noise (RIN) 1 2006
7,492,976 Flat dispersion frequency discriminator (FDFD) 13 2006
* 2006/0274,993 Flat dispersion frequency discriminator (FDFD) 42 2006
7,639,955 Method and apparatus for transmitting a signal using a chirp managed laser (CML) and an optical spectrum reshaper (OSR) before an optical receiver 14 2006
* 2007/0147,847 Method and apparatus for transmitting a signal using a chirp managed laser (CML) and an optical spectrum reshaper (OSR) before an optical receiver 1 2006
7,480,464 Widely tunable, dispersion tolerant transmitter 12 2006
* 2007/0183,792 Widely tunable, dispersion tolerant transmitter 0 2006
7,502,532 Multi-ring resonator implementation of optical spectrum reshaper for chirp managed laser technology 15 2007
* 2008/0002,990 Multi-ring resonator implementation of optical spectrum reshaper for chirp managed laser technology 12 2007
7,542,683 Chirp Managed Laser (CML) transmitter 12 2007
7,613,401 Optical FM source based on intra-cavity phase and amplitude modulation in lasers 17 2007
* 2007/0286,608 Optical FM source based on intra-cavity phase and amplitude modulation in lasers 13 2007
7,609,977 Optical transmission using semiconductor optical amplifier (SOA) 14 2007
* 2008/0159,751 Optical transmission using semiconductor optical amplifier (SOA) 19 2007
7,809,280 Chirp-managed, electroabsorption-modulated laser 14 2007
* 2008/0193,143 Chirp-managed, electroabsorption-modulated laser 5 2007
7,657,179 Wavelength division multiplexing source using multifunctional filters 18 2007
* 2008/0166,130 Wavelength division multiplexing source using multifunctional filters 0 2007
7,697,186 Spectral response modification via spatial filtering with optical fiber 12 2007
7,962,045 Optical transmitter having a widely tunable directly modulated laser and periodic optical spectrum reshaping element 4 2007
7,941,057 Integral phase rule for reducing dispersion errors in an adiabatically chirped amplitude modulated signal 3 2007
* 2008/0166,134 Optical Transmitter Having a Widely Tunable Directly Modulated Laser and Periodic Optical Spectrum Reshaping Element 13 2007
* 2008/0159,747 Integral Phase Rule for Reducing Dispersion Errors in an Adiabatically Chirped Amplitude Modulated Signal 12 2007
7,991,297 Chirped laser with passive filter element for differential phase shift keying generation 0 2008
* 2008/0247,763 CHIRPED LASER WITH PASSIVE FILTER ELEMENT FOR DIFFERENTIAL PHASE SHIFT KEYING GENERATION 12 2008
8,131,157 Method and apparatus for generating signals with increased dispersion tolerance using a directly modulated laser transmitter 0 2008
* 2008/0181,619 Method and apparatus for generating signals with increased dispersion tolerance using a directly modulated laser transmitter 12 2008
7,962,044 Temperature stabilizing packaging for optoelectronic components in a transmitter module 4 2008
* 2008/0187,325 TEMPERATURE STABILIZING PACKAGING FOR OPTOELECTRONIC COMPONENTS IN A TRANSMITTER MODULE 12 2008
8,027,593 Slow chirp compensation for enhanced signal bandwidth and transmission performances in directly modulated lasers 0 2008
7,991,291 WDM PON based on DML 5 2008
7,860,404 Optical FM source based on intra-cavity phase and amplitude modulation in lasers 11 2008
* 2009/0060,526 OPTICAL FM SOURCE BASED ON INTRA-CAVITY PHASE AND AMPLITUDE MODULATION IN LASERS 15 2008
7,869,473 Directly modulated laser with isolated modulated gain electrode for improved frequency modulation 5 2008
* 2009/0238,224 Directly Modulated Laser with Isolated Modulated Gain Electrode for Improved Frequency Modulation 2 2008
7,697,847 Dispersion compensator for frequency reshaped optical signals 13 2008
7,616,902 Power source for a dispersion compensation fiber optic system 12 2008
7,760,777 DBR laser with improved thermal tuning efficiency 13 2008
* 2009/0041,073 DBR LASER WITH IMPROVED THERMAL TUNING EFFICIENCY 3 2008
8,260,150 Passive wave division multiplexed transmitter having a directly modulated laser array 1 2008
7,907,648 Optical FM source based on intra-cavity phase and amplitude modulation in lasers 4 2008
* 2008/0240,180 OPTICAL FM SOURCE BASED ON INTRA-CAVITY PHASE AND AMPLITUDE MODULATION IN LASERS 32 2008
7,778,295 DBR laser with improved thermal tuning efficiency 13 2008
8,204,386 Chirped laser with passive filter element for differential phase shift keying generation 2 2008
* 2009/0003,842 CHIRPED LASER WITH PASSIVE FILTER ELEMENT FOR DIFFERENTIAL PHASE SHIFT KEYING GENERATION 12 2008
7,925,172 High power, low distortion directly modulated laser transmitter 0 2008
7,813,648 Method and apparatus for compensating for fiber nonlinearity in a transmission system 3 2008
8,792,531 Optical beam steering for tunable laser applications 0 2008
* 2008/0291,950 OPTICAL BEAM STEERING FOR TUNABLE LASER APPLICATIONS 11 2008
8,199,785 Thermal chirp compensation in a chirp managed laser 0 2009
* 2010/0329,666 THERMAL CHIRP COMPENSATION IN A CHIRP MANAGED LASER 1 2009
8,160,455 Method and apparatus for generating signals with increased dispersion tolerance using a directly modulated laser transmitter 1 2009
* 8,781,336 Optical filter for use in a laser transmitter 0 2012
 
NITRIC BIOTHERAPEUTICS, INC. (1)
* 2011/0071,491 Current Concentration System and Method for Electrokinetic Delivery of Medicaments 0 2010
 
JDS UNIPHASE CORPORATION (1)
* 5,657,153 Optical amplifier with complementary modulation signal inputs 29 1995
 
CORNING INCORPORATED (2)
* 7,436,871 Method and device for performing wavelength modulation with Distributed Bragg Reflector (DBR) laser 0 2004
* 2006/0120,416 Method and device for performing wavelength modulation with distributed bragg reflector (DBR) laser 3 2004
 
XTERA COMMUNICATIONS, INC. (12)
6,567,430 Raman oscillator including an intracavity filter and amplifiers utilizing same 10 1999
6,359,725 Multi-stage optical amplifier and broadband communication system 77 1999
6,370,164 Broadband sagnac raman amplifiers and cascade lasers 46 2000
6,631,025 Low-noise distributed Raman amplifier using bi-directional pumping using multiple Raman orders 24 2001
6,760,148 Nonlinear polarization amplifiers in nonzero dispersion shifted fiber 18 2001
6,600,592 S+ band nonlinear polarization amplifiers 5 2001
6,574,037 All band amplifier 42 2001
6,885,498 Multi-stage optical amplifier and broadband communication system 19 2001
6,833,946 Optical amplification using polarization diversity pumping 10 2002
* 2003/0058,899 Optical amplification using polarization diversity pumping 3 2002
6,714,342 Low-noise distributed Raman amplifier using bi-directional pumping using multiple Raman orders 2 2003
6,919,986 Nonlinear polarization amplifiers in nonzero dispersion shifted fiber 1 2003
 
FUJI XEROX CO., LTD. (1)
* 6,366,375 Optical-signal transmission apparatus and method, and signal processing apparatus 37 1998
 
Nola Semiconductor LLC (1)
* 6,546,160 Transceiver for wavelength multiplexing processes 6 2000
 
OPTICAL HORIZONS CORPORATION (2)
6,963,685 Power source for a dispersion compensation fiber optic system 59 2002
* 2004/0008,937 Power source for a dispersion compensation fiber optic system 3 2002
* Cited By Examiner