Patents by Inventor Ari Tervonen

Ari Tervonen 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).

  • Amplification of an optical WDM signal
    Patent number: 6359730
    Abstract: The invention relates to a method for amplifying an optical signal and to an amplifier unit (OFA) to which an optical input signal comprising a plurality of wavelength channel signals each at its dedicated wavelength is supplied. In the method, (a) demultiplexing is carried out to separate each wavelength channel signal from the input signal, (b) a first multiplexing is carried out, combining each separated wavelength channel signal with a separate pump signal, (c) each combination of a wavelength channel signal and pump signal is guided to its dedicated amplifier means (FA1 . . . FA4), and (d) the pump signals are separated from the amplified wavelength channel signals obtained from the amplifier means and a second multiplexing is carried out, combining the amplified wavelength channel signals into an outgoing WDM signal.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: March 19, 2002
    Assignee: Nokia Network Oy
    Inventor: Ari Tervonen
  • Amplification of an optical WDM signal
    Publication number: 20010048547
    Abstract: The invention relates to a method for amplifying an optical signal and to an amplifier unit (OFA) to which an optical input signal comprising a plurality of wavelength channel signals each at its dedicated wavelength is supplied. In the method, (a) demultiplexing is carried out to separate each wavelength channel signal from the input signal, (b) a first multiplexing is carried out, combining each separated wavelength channel signal with a separate pump signal, (c) each combination of a wavelength channel signal and pump signal is guided to its dedicated amplifier means (FA1 . . . FA4), and (d) the pump signals are separated from the amplified wavelength channel signals obtained from the amplifier means and a second multiplexing is carried out, combining the amplified wavelength channel signals into an outgoing WDM signal.
    Type: Application
    Filed: March 30, 2001
    Publication date: December 6, 2001
    Inventor: Ari Tervonen
  • Method of producing optical waveguides by an ion exchange technique on a glass substrate
    Patent number: 5160523
    Abstract: The invention relates to a method of producing waveguides by an ion exchange technique on a glass substrate. In order to be able to alleviate the tolerances allowed for the ion exchange technique, the waveguides are formed in the invention by diffusing ions which increase the refractive index away from a waveguide formed previously on the glass substrate and being wider than the optical waveguides to be produced, by using the ion exchange technique and a positive-type ion exchange mask.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: November 3, 1992
    Assignee: Oy Nokia AB
    Inventors: Seppo Honkanen, Ari Tervonen
  • Method of producing optical waveguides
    Patent number: 5035734
    Abstract: The invention relates to a method of producing optical waveguides by ion exchange technique in a glass substrate (1), the ion exchange between a source of ions (such as AgNO.sub.3) and the glass substrate (1) taking place within glass substrate surface areas (6) which do not comprise any ion exchange mask. In the method of the invention, the ion exchange mask is formed by depletion areas (5A, 5B) formed in the surface of the glass substrate.
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: July 30, 1991
    Assignee: Oy Nokia Ab
    Inventors: Seppo Honkanen, Simo Tammela, Ari Tervonen