Patents by Inventor Kejian Guan
Kejian Guan 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: 7130121Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: GrantFiled: March 20, 2006Date of Patent: October 31, 2006Assignee: Lightwaves 2020, Inc.Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Publication number: 20060158718Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: ApplicationFiled: March 20, 2006Publication date: July 20, 2006Applicant: Lightwaves 2020, Inc.Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Patent number: 7044660Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: GrantFiled: July 21, 2005Date of Patent: May 16, 2006Assignee: Lightwaves 2020, Inc.Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Publication number: 20050280888Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: ApplicationFiled: July 21, 2005Publication date: December 22, 2005Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Patent number: 6922281Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: GrantFiled: May 3, 2002Date of Patent: July 26, 2005Assignee: Lightwaves 2020, Inc.Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Publication number: 20030206335Abstract: An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section.Type: ApplicationFiled: May 3, 2002Publication date: November 6, 2003Applicant: Lightwaves 2020, Inc.Inventors: Jing-Jong Pan, Xiangdong Qiu, Kejian Guan, Mingjie Zhang
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Patent number: 6445499Abstract: An optical circulator having a dual fiber collimator and a single fiber collimator is described. The circulator provides a non-reciprocal functionality that directs input signals from a first fiber of the dual fiber collimator to the single fiber collimator. Input signals from the single fiber collimator are directed to a second fiber of the dual fiber collimator. The circulator includes birefringent wedges that change the angle of signals from the single fiber collimator to direct the signals to the second fiber of the dual fiber collimator. Because the circulator includes two collimators rather than three collimators, the circulator is more compact than a circulator having three collimators.Type: GrantFiled: December 31, 1999Date of Patent: September 3, 2002Assignee: JDS Uniphase CorporationInventors: Kok-Wai Chang, Kejian Guan, Yong Zhang
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Patent number: 6317250Abstract: A method and apparatus for optically isolating multiple core optical fibers while at the same time substantially reducing polarization mode dispersion, is disclosed. A multiple core fiber is optically coupled to optical birefringent elements, reciprocal and non-reciprocal rotators, and through a lens assembly to a multiple core optical fiber output.Type: GrantFiled: September 12, 2000Date of Patent: November 13, 2001Assignee: E-Tek Dynamics, Inc.Inventors: Kejian Guan, Kok Wai Chang
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Patent number: 6246518Abstract: The isolator core having a walk-off crystal, a non-reciprocal rotator coupled to the walk-off crystal, and a reciprocal rotator coupled to the walk-off crystal.Type: GrantFiled: March 25, 1999Date of Patent: June 12, 2001Assignee: E-Tek Dynamics, Inc.Inventors: Kok Wai Chang, Kejian Guan