Abstract: The present invention relates to an optical fiber having a normalized frequency applicable to a broadband optical device, and to a broadband, polarization-independent, low-loss optical fiber device made by using the aforementioned optical fiber. The optical fiber of the present invention has a normalized frequency value V, structural parameters of which including a core radius, a core refractive index and a cladding refractive index are adjusted to minimize the beat dispersion between first and second modes in a predetermined frequency range. Various optical fiber devices may be achieved if the aforementioned optical fiber is used along with acoustic wave generating means and a mode dropper or a mode selective coupler.
Type:
Grant
Filed:
December 19, 2000
Date of Patent:
September 16, 2003
Assignee:
Ultraband Fiber Optics, Inc.
Inventors:
Yeon Wan Koh, Jin Ha Kim, Bong Wan Lee, Seok Hyun Yun, Byoung Yoon Kim, Kyung Hwan Oh
Abstract: An acousto-optic filter has a non-birefringent single mode optical fiber with a longitudinal axis, a core and a cladding in a surrounding relationship to the core. The optical fiber has multiple cladding modes and a single core mode that is guided along the core. An acoustic wave propagation member has a proximal end and a distal end coupled to the optical fiber. The acoustic wave propagation member propagates an acoustic wave from the proximal to the distal end and launches a flexural wave in the optical fiber. At least one acoustic wave generator is coupled to the proximal end of the acoustic wave propagation member.
Type:
Grant
Filed:
October 22, 1999
Date of Patent:
July 24, 2001
Assignee:
Ultraband Fiber Optics
Inventors:
Byoung Yoon Kim, Seok Hyun Yun, Bong Wan Lee
Abstract: An acousto-optic filter has a non-birefringent single mode optical fiber with a longitudinal axis, a core and a cladding in a surrounding relationship to the core. The optical fiber has multiple cladding modes and a single core mode that is guided along the core. An acoustic wave propagation member has a proximal end and a distal end coupled to the optical fiber. The acoustic wave propagation member propagates an acoustic wave from the proximal to the distal end and launches a flexural wave in the optical fiber. At least one acoustic wave generator is coupled to the proximal end of the acoustic wave propagation member.
Type:
Grant
Filed:
May 15, 2000
Date of Patent:
June 26, 2001
Assignee:
Ultraband Fiber Optics
Inventors:
Byoung Yoon Kim, Seok Hyun Yun, Bong Wan Lee
Abstract: An acousto-optic filter has a non-birefringent single mode optical fiber with a longitudinal axis, a core and a cladding in a surrounding relationship to the core. The optical fiber has multiple cladding modes and a single core mode that is guided along the core. An acoustic wave propagation member has a proximal end and a distal end coupled to the optical fiber. The acoustic wave propagation member propagates an acoustic wave from the proximal to the distal end and launches a flexural wave in the optical fiber. At least one acoustic wave generator is coupled to the proximal end of the acoustic wave propagation member.
Type:
Grant
Filed:
October 22, 1999
Date of Patent:
May 15, 2001
Assignee:
Ultraband Fiber Optics
Inventors:
Byoung Yoon Kim, Seok Hyun Yun, Bong Wan Lee