Patents by Inventor Alfred T. Schremer
Alfred T. Schremer 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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Publication number: 20100099209Abstract: A laser and electroabsorption modulator (EAM) are monolithically integrated through an etched facet process. Epitaxial layers on a wafer include a first layer for a laser structure and a second layer for an EAM structure. Strong optical coupling between the laser and the EAM is realized by using two 45-degree turning mirrors to route light vertically from the laser waveguide to the EAM waveguide. A directional angled etch process is used to form the two angled facets.Type: ApplicationFiled: December 17, 2009Publication date: April 22, 2010Inventors: Alex A. Behfar, MaIcolm R. Green, Alfred T. Schremer
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Publication number: 20100091810Abstract: A laser and electroabsorption modulator (EAM) are monolithically integrated through an etched facet process. Epitaxial layers on a wafer include a first layer for a laser structure and a second layer for an EAM structure. Strong optical coupling between the laser and the EAM is realized by using two 45-degree turning mirrors to route light vertically from the laser waveguide to the EAM waveguide. A directional angled etch process is used to form the two angled facets.Type: ApplicationFiled: December 17, 2009Publication date: April 15, 2010Inventors: Alex A. Behfar, Malcolm R. Green, Alfred T. Schremer
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Patent number: 7656922Abstract: A laser and electroabsorption modulator (EAM) are monolithically integrated through an etched facet process. Epitaxial layers on a wafer include a first layer for a laser structure and a second layer for an EAM structure. Strong optical coupling between the laser and the EAM is realized by using two 45-degree turning mirrors to route light vertically from the laser waveguide to the EAM waveguide. A directional angled etch process is used to form the two angled facets.Type: GrantFiled: April 14, 2005Date of Patent: February 2, 2010Assignee: Binoptics CorporationInventors: Alex A. Behfar, Malcolm R. Green, Alfred T. Schremer
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Publication number: 20100015743Abstract: A photonic device incorporates an epitaxial structure having an active region, and which includes a wet etch stop layer above, but close to, the active region. An etched-facet ridge laser is fabricated on the epitaxial structure by dry etching followed by wet etching. The dry etch is designed to stop before reading the depth needed to form the ridge. The wet etch completes the formation of the ridge and stops at the wet etch stop layer.Type: ApplicationFiled: September 25, 2009Publication date: January 21, 2010Inventors: Alex A. Behfar, Alfred T. Schremer, Cristian B. Stagarescu
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Patent number: 7606277Abstract: A photonic device incorporate an epitaxial structure having an active region, and which includes a wet etch stop layer above, but close to, the active region. An etched-facet ridge laser is fabricated on the epitaxial structure by dry etching followed by wet etching. The dry etch is designed to stop before reading the depth needed to form the ridge. The wet etch completes the formation of the ridge and stops at the wet etch stop layer.Type: GrantFiled: December 26, 2006Date of Patent: October 20, 2009Assignee: Binoptics CorporationInventors: Alex A. Behfar, Cristian B. Stagarescu, Alfred T. Schremer
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Patent number: 7598527Abstract: A laser and detector integrated on corresponding epitaxial layers of a single chip cooperate with on-chip and/or external optics to couple light of a first wavelength emitted by the laser to a single external device such as an optical fiber and to simultaneously couple light of a different wavelength received from the external device to the detector to provide bidirectional photonic operation. Multiple lasers and detectors may be integrated on the chip to provide multiple bidirectional channels. A monitoring photodetector is fabricated in the detector epitaxy adjacent one end of the laser.Type: GrantFiled: January 5, 2006Date of Patent: October 6, 2009Assignee: Binoptics CorporationInventors: Alex A. Behfar, Cristian B. Stagarescu, Malcolm R. Green, Alfred T. Schremer, Jr.
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Patent number: 7569860Abstract: A laser (22) and detector (24) integrated on corresponding epitaxial layers of a single chip (20) cooperate with on-chip and/or external optics (62) to couple light of a first wavelength emitted by the laser to a single external device such as an optical fiber (60) and to simultaneously couple light of a different wavelength received from the external device to the detector to provide bidirectional photonic operation. Multiple lasers and detectors may be integrated on the chip to provide multiple bidirectional channels.Type: GrantFiled: January 19, 2005Date of Patent: August 4, 2009Assignee: BinOptics CorporationInventors: Alex A. Behfar, Malcolm Green, Alfred T. Schremer
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Publication number: 20080151955Abstract: A photonic device incorporate an epitaxial structure having an active region, and which includes a wet etch stop layer above, but close to, the active region. An etched-facet ridge laser is fabricated on the epitaxial structure by dry etching followed by wet etching. The dry etch is designed to stop before reading the depth needed to form the ridge. The wet etch completes the formation of the ridge and stops at the wet etch stop layer.Type: ApplicationFiled: December 26, 2006Publication date: June 26, 2008Applicant: BinOptics CorporationInventors: Alex A. Behfar, Alfred T. Schremer, Cristian B. Stagarescu
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Patent number: 7245645Abstract: A surface-emitting laser, in which light is emitted vertically at one end from a near 45°-angled facet, includes a second end having a perpendicular facet from which light is emitted horizontally, for monitoring. The surface-emitting laser comprises a divergence-compensating lens on the surface above the near 45°-angled facet.Type: GrantFiled: October 14, 2004Date of Patent: July 17, 2007Assignee: BinOptics CorporationInventors: Alex A. Behfar, Alfred T. Schremer, Cristian B. Stagarescu
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Patent number: 7012291Abstract: Three-dimensional structures of arbitrary shape are fabricated on the surface of a substrate through a series of processing steps wherein a monolithic structure is fabricated in successive layers. A first layer of photoresist material is spun onto a substrate surface and is exposed in a desired pattern corresponding to the shape of a final structure, at a corresponding cross-sectional level in the structure. The layer is not developed after exposure; instead, a second layer of photoresist material is deposited and is also exposed in a desired pattern. Subsequent layers are spun onto the top surface of prior layers and exposed, and upon completion of the succession of layers each defining corresponding levels of the desired structure, the layers are all developed at the same time leaving the three-dimensional structure.Type: GrantFiled: July 17, 2003Date of Patent: March 14, 2006Assignee: BinOptics CorporationInventors: Alex Behfar, Alfred T. Schremer, Cristian B. Stagarescu
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Publication number: 20040184506Abstract: Unidirectionality of lasers is enhanced by forming one or more etched gaps (78, 80) in the laser cavity. The gaps may be provided in any segment of a laser, such as any leg of a ring laser, or in one leg (62) of a V-shaped laser (60). A Brewster angle facet at the distal end of a photonic device coupled to the laser reduces back-reflection into the laser cavity. A distributed Bragg reflector is used at the output of a laser to enhance the side-mode suppression ratio of the laser.Type: ApplicationFiled: March 18, 2004Publication date: September 23, 2004Inventors: Alex A. Behfar, Alfred T. Schremer, Cristian B. Stagarescu
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Patent number: 6792025Abstract: An integrated semiconductor laser device capable of emitting light of selected wavelengths includes multiple ring lasers of different cavity lengths coupled in series or in parallel to a common output to produce an output beam having a wavelength corresponding to the selected ring lasers.Type: GrantFiled: August 23, 2002Date of Patent: September 14, 2004Assignee: BinOptics CorporationInventors: Alex Behfar, Alfred T. Schremer, Jr., Cristian B. Stagarescu
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Publication number: 20040028327Abstract: Three-dimensional structures of arbitrary shape are fabricated on the surface of a substrate through a series of processing steps wherein a monolithic structure is fabricated in successive layers. A first layer of photoresist material is spun onto a substrate surface and is exposed in a desired pattern corresponding to the shape of a final structure, at a corresponding cross-sectional level in the structure. The layer is not developed after exposure; instead, a second layer of photoresist material is deposited and is also exposed in a desired pattern. Subsequent layers are spun onto the top surface of prior layers and exposed, and upon completion of the succession of layers each defining corresponding levels of the desired structure, the layers are all developed at the same time leaving the three-dimensional structure.Type: ApplicationFiled: July 17, 2003Publication date: February 12, 2004Applicant: BinOptics CorporationInventors: Alex Behfar, Alfred T. Schremer, Cristian B. Stagarescu
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Patent number: 6653244Abstract: Three-dimensional structures of arbitrary shape are fabricated on the surface of a substrate through a series of processing steps wherein a monolithic structure is fabricated in successive layers. A first layer of photoresist material is spun onto a substrate surface and is exposed in a desired pattern corresponding to the shape of a final structure, at a corresponding cross-sectional level in the structure. The layer is not developed after exposure; instead, a second layer of photoresist material is deposited and is also exposed in a desired pattern. Subsequent layers are spun onto the top surface of prior layers and exposed, and upon completion of the succession of layers each defining corresponding levels of the desired structure, the layers are all developed at the same time leaving the three-dimensional structure.Type: GrantFiled: September 19, 2001Date of Patent: November 25, 2003Assignee: BinOptics CorporationInventors: Alex Behfar, Alfred T. Schremer, Cristian B. Stagarescu
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Publication number: 20030054578Abstract: Three-dimensional structures of arbitrary shape are fabricated on the surface of a substrate through a series of processing steps wherein a monolithic structure is fabricated in successive layers. A first layer of photoresist material is spun onto a substrate surface and is exposed in a desired pattern corresponding to the shape of a final structure, at a corresponding cross-sectional level in the structure. The layer is not developed after exposure; instead, a second layer of photoresist material is deposited and is also exposed in a desired pattern. Subsequent layers are spun onto the top surface of prior layers and exposed, and upon completion of the succession of layers each defining corresponding levels of the desired structure, the layers are all developed at the same time leaving the three-dimensional structure.Type: ApplicationFiled: September 19, 2001Publication date: March 20, 2003Applicant: BinOptics CorporationInventors: Alex Behfar, Alfred T. Schremer, Cristian B. Stagarescu
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Patent number: 5172382Abstract: Polarization self-modulation of a laser produces high-frequency optical modulation without the use of high-speed electronics. This is accomplished by inserting into a laser cavity a polarization converter, which rotates the polarization of the laser light periodically as the light passes through the converter as it circulates in the cavity. The frequency of the modulation is determined by the cavity length. In one configuration, a quarter-wave retardation plate is used as the intracavity polarization converter in a Fabry-Perot laser. In a second embodiment, the converter is an electro-optic crystal which acts as an electronically-controllable half-wave retardation plate.Type: GrantFiled: February 5, 1991Date of Patent: December 15, 1992Assignee: Cornell Research Foundation, Inc.Inventors: Wei-Hung Loh, Alfred T. Schremer, Yukihiro Ozeki, Chung L. Tang