Patents by Inventor Weiti Wu
Weiti Wu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6822786Abstract: An all fiber optical filter is formed by stretching an optical fiber. The all fiber filter includes a core, an inner cladding, and an outer cladding. A core index of refraction is greater than an outer cladding index of refraction. The outer cladding index of refraction is greater than an inner cladding index of refraction. The all fiber optical filter attenuates a portion of an optical signal by transferring optical energy from the core to the outer cladding by evanescent coupling. The all fiber optical filter has a compact structure, which prevents bending and provides stable temperature performance. The all fiber optical filter is preferably used in Wavelength Division Multiplexing (WDM) systems for gain flattening of gain responses from Erbium Doped Fiber Amplifiers (EDFAs). Alternatively, the all fiber optical filter is used in other applications where optical filtering or attenuation is needed.Type: GrantFiled: December 12, 2001Date of Patent: November 23, 2004Assignee: SDO Communications Corp.Inventors: Weiti Wu, Yu-Li Ko
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Patent number: 6636667Abstract: A tunable optical fiber grating package with a supporting assembly and an optical fiber portion having at least one grating between a first end and a second end of the fiber portion is provided. The first end and the second end of the fiber portion define a longitudinal direction and the at least one grating has an optical characteristic that varies with strain of the fiber portion. The supporting assembly has a first supporting member formed of a material having ultra low CTE, a second supporting member formed of a material having a negative CTE and a tuning means for changing the dimension of the first supporting member substantially along the longitudinal direction. The first supporting member and the second supporting member are bonded together.Type: GrantFiled: December 6, 2001Date of Patent: October 21, 2003Assignee: Oplink Communications Inc.Inventors: Qinglin Wang, Weiti Wu
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Patent number: 6621960Abstract: A method of fabricating multiple superimposed Bragg gratings in the core of a portion of a photosensitive fiber is provided where only one common phase-mask is used. The multiple superimposed Bragg gratings are inscribed in the portion of the photosensitive fiber by applying different predetermined longitudinal stresses to the portion for each corresponding writing. The different predetermined longitudinal stresses are applied to the portion of the photosensitive fiber by stretching the portion along its longitudinal axis bi-directionally and simultaneously such that the centers of all fiber Bragg gratings imprinted in the portion are substantially superimposed at the center of the portion of the photosensitive fiber.Type: GrantFiled: January 24, 2002Date of Patent: September 16, 2003Assignee: Oplink Communications, Inc.Inventors: Qinglin Wang, Weiti Wu, Weizhong Li
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Publication number: 20030138207Abstract: A method of fabricating multiple superimposed Bragg gratings in the core of a portion of a photosensitive fiber is provided where only one common phase-mask is used. The multiple superimposed Bragg gratings are inscribed in the portion of the photosensitive fiber by applying different predetermined longitudinal stresses to the portion for each corresponding writing. The different predetermined longitudinal stresses are applied to the portion of the photosensitive fiber by stretching the portion along its longitudinal axis bi-directionally and simultaneously such that the centers of all fiber Bragg gratings imprinted in the portion are substantially superimposed at the center of the portion of the photosensitive fiber.Type: ApplicationFiled: January 24, 2002Publication date: July 24, 2003Inventors: Qinglin Wang, Weiti Wu, Weizhong Li
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Publication number: 20030108287Abstract: A tunable optical fiber grating package with a supporting assembly and an optical fiber portion having at least one grating between a first end and a second end of the fiber portion is provided. The first end and the second end of the fiber portion define a longitudinal direction and the at least one grating has an optical characteristic that varies with strain of the fiber portion. The supporting assembly has a first supporting member formed of a material having ultra low CTE, a second supporting member formed of a material having a negative CTE and a tuning means for changing the dimension of the first supporting member substantially along the longitudinal direction. The first supporting member and the second supporting member are bonded together.Type: ApplicationFiled: December 6, 2001Publication date: June 12, 2003Inventors: Qinglin Wang, Weiti Wu
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Publication number: 20020110318Abstract: An all fiber optical filter is formed by stretching an optical fiber. The all fiber filter includes a core, an inner cladding, and an outer cladding. A core index of refraction is greater than an outer cladding index of refraction. The outer cladding index of refraction is greater than an inner cladding index of refraction. The all fiber optical filter attenuates a portion of an optical signal by transferring optical energy from the core to the outer cladding by evanescent coupling. The all fiber optical filter has a compact structure, which prevents bending and provides stable temperature performance. The all fiber optical filter is preferably used in Wavelength Division Multiplexing (WDM) systems for gain flattening of gain responses from Erbium Doped Fiber Amplifiers (EDFAs). Alternatively, the all fiber optical filter is used in other applications where optical filtering or attenuation is needed.Type: ApplicationFiled: December 12, 2001Publication date: August 15, 2002Inventors: Weiti Wu, Yu-Li Ko
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Publication number: 20020041434Abstract: An all fiber optical filter is formed by stretching an optical fiber. The all fiber filter includes a core, an inner cladding, and an outer cladding. A core index of refraction is greater than an outer cladding index of refraction. The outer cladding index of refraction is greater than an inner cladding index of refraction. The all fiber optical filter attenuates a portion of an optical signal by transferring optical energy from the core to the outer cladding by evanescent coupling. The all fiber optical filter has a compact structure, which prevents bending and provides stable temperature performance. The all fiber optical filter is preferably used in Wavelength Division Multiplexing (WDM) systems for gain flattening of gain responses from Erbium Doped Fiber Amplifiers (EDFAs). Alternatively, the all fiber optical filter is used in other applications where optical filtering or attenuation is needed.Type: ApplicationFiled: December 12, 2001Publication date: April 11, 2002Inventors: Weiti Wu, Yu-Li Ko, Gary Chung
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Patent number: 6362916Abstract: An all fiber optical filter is formed by stretching an optical fiber. The all fiber filter includes a core, an inner cladding and an outer cladding. A core index of refraction is greater than an outer cladding index of refraction. The outer cladding index of refraction is greater than an inner cladding index of refraction. The all fiber optical filter attenuates a portion of an optical signal by transferring optical energy from the core to the outer cladding by evanescent coupling. The all fiber optical filter has a compact structure, which prevents bending and provides stable temperature performance. The all fiber optical filter is preferably used in Wavelength Division Multiplexing (WDM) systems for gain flattening of gain responses from Erbium Doped Fiber Amplifiers (EDFAs). Alternatively, the all fiber optical filter is used in other applications where optical filtering or attenuation is needed.Type: GrantFiled: February 9, 1999Date of Patent: March 26, 2002Assignee: Fiver LaboratoriesInventors: Weiti Wu, Yu-Li Ko, Gary Chung
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Publication number: 20020003654Abstract: An all fiber optical filter is formed by stretching an optical fiber. The all fiber filter includes a core, an inner cladding, and an outer cladding. A core index of refraction is greater than an outer cladding index of refraction. The outer cladding index of refraction is greater than an inner cladding index of refraction. The all fiber optical filter attenuates a portion of an optical signal by transferring optical energy from the core to the outer cladding by evanescent coupling. The all fiber optical filter has a compact structure, which prevents bending and provides stable temperature performance. The all fiber optical filter is preferably used in Wavelength Division Multiplexing (WDM) systems for gain flattening of gain responses from Erbium Doped Fiber Amplifiers (EDFAs). Alternatively, the all fiber optical filter is used in other applications where optical filtering or attenuation is needed.Type: ApplicationFiled: February 9, 1999Publication date: January 10, 2002Inventors: WEITI WU, YU-LI KO, GARY CHUNG
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Patent number: 6049645Abstract: The present invention provides fiber optic couplers for use with at least three optic fibers. The optic fibers arranged in a linear array, that is, the optic fibers are coupled side by side. The fibers along either end of the linear-array are coupled only to a single fiber, while the remaining fibers are generally coupled between only two adjacent fibers. Generally, at least one of the fibers has a propagation constant different that the other fibers. Such variations in the propagation constant are used to vary the coupling coefficients among the fibers of the linear-array, thereby providing a repeatable mechanism, to vary coupled power ratios among the fibers of the coupler. Theoretical calculations and empirical experience have shown that varying the propagation constant of fibers among a linear-array, generally by pre-pulling the fibers by varying amounts, allows repeatable manufacturing of 1.times.3, 1.times.4, 4.thrfore.3, 1.times.N and even N.times.N fiber couplers having even coupled power ratios.Type: GrantFiled: December 8, 1997Date of Patent: April 11, 2000Assignee: E-Tek Dynamics, Inc.Inventors: Jing-Jong Pan, Ming Shih, Weiti Wu, Yu-Li Ko, Donna S. Yu
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Patent number: 5764830Abstract: The present invention provides fiber optic couplers for use with at least three optic fibers. The optic fibers arranged in a linear array, that is, the optic fibers are coupled side by side. The fibers along either end of the linear-array are coupled only to a single fiber, while the remaining fibers are generally coupled between only two adjacent fibers. Generally, at least one of the fibers has a propagation constant different than the other fibers. Such variations in the propagation constant are used to vary the coupling coefficients among the fibers of the linear-array, thereby providing a repeatable mechanism, to vary coupled power ratios among the fibers of the coupler. Theoretical calculations and empirical experience have shown that varying the propagation constant of fibers among a linear-array, generally by pre-pulling the fibers by varying amounts, allows repeatable manufacturing of 1.times.3, 3.times.3, 1.times.4, 4.times.4, 1.times.N and even N.times.Type: GrantFiled: November 13, 1996Date of Patent: June 9, 1998Assignee: E-Tek Dynamics, Inc.Inventors: Jing-Jong Pan, Ming Shih, Weiti Wu, Yu-Li Ko, Donna S. Yu