Patents by Inventor Alex A. Behfar

Alex A. Behfar 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).

  • Publication number: 20080298413
    Abstract: A method and structure for producing lasers having good optical wavefront characteristics, such as are needed for optical storage includes providing a laser wherein an output beam emerging from the laser front facet is essentially unobstructed by the edges of the semiconductor chip in order to prevent detrimental beam distortions. The semiconductor laser structure is epitaxially grown on a substrate with at least a lower cladding layer, an active layer, an upper cladding layer, and a contact layer. Dry etching through a lithographically defined mask produces a laser mesa of length lc and width bm. Another sequence of lithography and etching is used to form a ridge structure with width won top of the mesa. The etching step also forming mirrors, or facets, on the ends of the laser waveguide structures. The length ls and width bs of the chip can be selected as convenient values equal to or longer than the waveguide length lc and mesa width bm, respectively.
    Type: Application
    Filed: July 10, 2008
    Publication date: December 4, 2008
    Inventors: Alex A. Behfar, Wilfried Lenth
  • Publication number: 20080219316
    Abstract: A surface emitting laser (100) and a monitoring photodetector (MPD) 158 are mounted in a TO (transistor outline package) can (150) on the same plane as one another. Light from a rear facet (108) of the laser is directed to the MPD through a polymer light guide (164).
    Type: Application
    Filed: March 5, 2008
    Publication date: September 11, 2008
    Inventors: Joseph J. Vandenberg, Norman S. Kwong, Alex A. Behfar
  • Patent number: 7408183
    Abstract: A method and structure for producing lasers having good optical wavefront characteristics, such as are needed for optical storage includes providing a laser wherein an output beam emerging from the laser front facet is essentially unobstructed by the edges of the semiconductor chip in order to prevent detrimental beam distortions. The semiconductor laser structure is epitaxially grown on a substrate with at least a lower cladding layer, an active layer, an upper cladding layer, and a contact layer. Dry etching through a lithographically defined mask produces a laser mesa of length lc and width bm. Another sequence of lithography and etching is used to form a ridge structure with width w on top of the mesa. The etching step also forming mirrors, or facets, on the ends of the laser waveguide structures. The length ls and width bs of the chip can be selected as convenient values equal to or longer than the waveguide length lc and mesa width bm, respectively.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: August 5, 2008
    Assignee: Binoptics Corporation
    Inventors: Alex A. Behfar, Wilfried Lenth
  • Publication number: 20080151955
    Abstract: 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: Application
    Filed: December 26, 2006
    Publication date: June 26, 2008
    Applicant: BinOptics Corporation
    Inventors: Alex A. Behfar, Alfred T. Schremer, Cristian B. Stagarescu
  • Publication number: 20080019408
    Abstract: A process for fabricating lasers capable of emitting blue light wherein a GaN wafer is etched to form laser waveguides and mirrors using a temperature of over 500° C. and an ion beam in excess of 500 V in CAIBE, and wherein said laser waveguide has inwardly angled sidewalls.
    Type: Application
    Filed: July 18, 2007
    Publication date: January 24, 2008
    Applicant: BinOptics Corporation
    Inventor: Alex A. Behfar
  • Patent number: 7245645
    Abstract: 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: Grant
    Filed: October 14, 2004
    Date of Patent: July 17, 2007
    Assignee: BinOptics Corporation
    Inventors: Alex A. Behfar, Alfred T. Schremer, Cristian B. Stagarescu
  • Patent number: 7042630
    Abstract: A ring cavity laser has at least two facets and a mechanism is provided to produce unidirectional propagation and light emission at a first wavelength. A source of laser light at a second wavelength is injected into the cavity to reverse the direction of propagation and to produce emission at the second wavelength.
    Type: Grant
    Filed: July 16, 2003
    Date of Patent: May 9, 2006
    Assignee: Binoptics Corp.
    Inventor: Alex A. Behfar
  • Publication number: 20040184506
    Abstract: 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: Application
    Filed: March 18, 2004
    Publication date: September 23, 2004
    Inventors: Alex A. Behfar, Alfred T. Schremer, Cristian B. Stagarescu
  • Patent number: 6510467
    Abstract: A method for increasing the rate of transfer of web page data files having embedded data files between users of an Internet service and an Internet server. The method is implemented from a set of instructions read by a computer from a diskette. The executed method assigns a first communication channel of the computer to transfer a first data file between the server and the user. The data file is checked for the identity of embedded files, and the identity and address of the embedded files are stored in a table. The embedded files are thereafter transferred through the first communication channel and a second communication channel following transfer of the first data file. In the event that a data transfer of a file becomes stalled, an additional channel is assigned to simultaneously transfer the stalled file with the channel carrying the stalled file.
    Type: Grant
    Filed: January 6, 1999
    Date of Patent: January 21, 2003
    Assignee: International Business Machines Corporation
    Inventors: Alex A. Behfar, Richard L. Ehrlickman, Muhammed I. Hussain
  • Patent number: 6326285
    Abstract: A method of forming multiple SOI wafers from a plurality of individual wafers each having a first side and a second side. The method includes forming an oxide surface on the first side on each of the plurality of individual wafers and forming a hydrogen rich region at a preselected depth on the second side on each of the plurality of individual wafers. The wafers are then bonded into a stacked configuration and heat treated to fracture the wafers at the hydrogen rich regions. This fracture forms at least two SOI wafers.
    Type: Grant
    Filed: February 24, 2000
    Date of Patent: December 4, 2001
    Assignee: International Business Machines Corporation
    Inventors: Alex A. Behfar, Kris V. Srikrishnan
  • Patent number: 6174175
    Abstract: An electrical connector or interposer for making connection in a high density device electronic environment. The connector is made of a high density array of nickel columns held in a layer of polyimide with each column extending beyond the opposing surfaces of said layer of polyimide. The connector may be used to make temporary or permanent connection to electrical contacts without alignment. Connection may be accomplished by loading forces sufficient to form either an indentation or a penetration of solder ball contacts. Contact to a single chip or a full wafer of chips is facilitated for testing.
    Type: Grant
    Filed: April 29, 1999
    Date of Patent: January 16, 2001
    Assignee: International Business Machines Corporation
    Inventors: Alex A. Behfar, Dale Curtis McHerron, Charles Hampton Perry