Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2006-03-28
2006-03-28
Dang, Hung Xuan (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S291000, C359S292000, C359S571000, C359S572000, C359S573000
Reexamination Certificate
active
07019883
ABSTRACT:
An dynamic optical filter10is provided to selectively attenuate or filter a wavelength band(s) of light (i.e., optical channel(s)) or a group(s) of wavelength bands of an optical WDM input signal12.The optical filter is controllable or programmable to selectively provide a desired filter function. The optical filter10includes a spatial light modulator36,which comprises an array of micromirrors52that effectively forms a two-dimensional diffraction grating mounted in a retro-reflecting configuration. Each optical channel14is dispersed separately or overlappingly onto the array of micro-mirrors52along a spectral axis or direction55such that each optical channel or group of optical channels are spread over a plurality of micromirrors to effectively pixelate each of the optical channels or input signal. Each channel14or group of channels may be selectively attenuated by flipping or tilting a selected number of micromirrors to thereby deflect a portion of the incident radiation away from the return optical path. The micro-mirrors operate in a digital manner by flipping between a first and second position in response to a control signal56provided by a controller58in accordance with an attenuation algorithm and an input command60.The switching algorithm may provide a bit (or pixel) map or look-up table indicative of the state of each of the micro-mirrors52of the array to selectively attenuate the input signal and provide a modified output signal38at optical fiber40.
REFERENCES:
patent: 4626066 (1986-12-01), Levinson
patent: 4710732 (1987-12-01), Hornbeck
patent: 4799795 (1989-01-01), Fateley
patent: 4819084 (1989-04-01), Bark
patent: 5121239 (1992-06-01), Post
patent: 5158420 (1992-10-01), Weyer
patent: 5166766 (1992-11-01), Grudkowski et al.
patent: 5504575 (1996-04-01), Stafford
patent: 5696614 (1997-12-01), Ishikawa et al.
patent: 5699462 (1997-12-01), Fouquet et al.
patent: 5729386 (1998-03-01), Hwang
patent: 5774604 (1998-06-01), McDonald
patent: 5777781 (1998-07-01), Nam et al.
patent: 5915063 (1999-06-01), Colbourne et al.
patent: 5960133 (1999-09-01), Tomlinson
patent: 6097859 (2000-08-01), Solgaard et al.
patent: 6128077 (2000-10-01), Jovin et al.
patent: 6160928 (2000-12-01), Schroeder
patent: 6204946 (2001-03-01), Aksyuk et al.
patent: 6222954 (2001-04-01), Riza
patent: 6246818 (2001-06-01), Fukushima
patent: 6263127 (2001-07-01), Dragone et al.
patent: 6275623 (2001-08-01), Brophy et al.
patent: 6434291 (2002-08-01), Kessler et al.
patent: 6459484 (2002-10-01), Yokoi
patent: 6525863 (2003-02-01), Riza
patent: 6671295 (2003-12-01), Gutin
patent: 2001/0046350 (2001-11-01), Tedesco
patent: 2002/0009257 (2002-01-01), Bouevitch et al.
patent: 2002/0081070 (2002-06-01), Tew
patent: 1 052 868 (2000-11-01), None
patent: WO 01/11419 (2001-02-01), None
patent: WO 01/18577 (2001-03-01), None
Texas Instruments, Provisional Pat. Appl. No. 60/250,520 Filed Nov. 30, 2000, Ref from Publication No. 2002/0081070, Tew.
S. Yuan et al., “General Formula for Coupling-loss Characterization of Single-Mode Fiber Collimators by Use of Gradient-Index Rod Lenses, Applied Optics”, vol. 38. No. 15, May 20, 1999, pp. 3214-3222.
N. Riza, “Reconfigurable Optical Wireless”, IEEE Lasers and Electro-Optics Society 1999 Annual Meeting, vol. 1, pp. 70-71.
N. Riza et al., “Digitally Controlled Fault-Tolerant Multiwavelength Programmable Fiber-Optic Attenuator Using a Two-Dimensional Digital Micromirror Device”, 1999 Optical Society of America.
N. Riza et al., “Multiwavelength Three Dimensional 2×2 Fiber-Optic Switch Structure Using Small Tilt Micro-Mirrors”, SPIE vol. 3749, pps 470-471.
G. Love, “Liquid-crystal Phase Modulator For Unpolarized Light”, Applied Optics, vol. 32, No. 13, May 1, 1993, pps 2222-2223.
N. Riza et al., “Synchronous Amplitude and Time Control for an Optimum Dynamic Range Variable Photonic Delay Line”, Applied Optics, vol. 38, No. 11, Apr. 10, 1999, 2309-2318.
N. Riza et al., “Robust Packaging of Photonic RF Modules Using Ultra-Thin Adaptive Optical Interconnect Devices”, SPIE vol. 3160, pps. 170-176.
N. Riza et al., “Demonstration of a Liquid-crystal adaptive alignment tweeker for high-speed Infrared Band Fiber-Fed Free-space Systems”, Opt. Eng. 37(6), Jun. 1998, 1876-1880.
M. D. Johnson et al., “Two-axis Micromirror Scanner”, SPIE vol. 3787, Jul. 1999, pps. 88-95.
H. Laor et al., “Performance of a S76×576 Optical Cross Connect”, National Fiber Optic Engineers Conference, Sep. 26-30, 1999, pps. 276-281.
Patent Abstract of Japan, F. Nobuhiro, “Optical Demultiplexer”, Publication No. 62264009 Publication Date, Nov. 17, 1987.
Davis Michael
Dunphy James
Kersey Alan D.
Moon John
Pinto Joseph
CiDRA Corporation
Dang Hung Xuan
Martinez Joseph
LandOfFree
Dynamic optical filter having a spatial light modulator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dynamic optical filter having a spatial light modulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamic optical filter having a spatial light modulator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3613795