1
Gang Paul Chen, Avishay Eyal, Anthony S Kewitsch, Victor Leyva, George A Rakuljic: System and method for fabricating components of precise optical path length. October 1, 2002: US06459487 (109 worldwide citation)

Optical components, particularly microoptic glass components used in synthesizing birefringence in filter systems based on polarization interferometer techniques, are fabricated using systems and methods which provide accurate frequency periodicity measurements. These measurements are derived from d ...


2
George A Rakuljic, Amnon Yariv: Photorefractive systems and methods. Accuwave Corporation, Merchant Gould Smith Edell Welter & Schmidt, August 8, 1995: US05440669 (85 worldwide citation)

A new type of holographic recording in photorefractive crystals is disclosed, termed orthogonal data storage, in which counterpropagating, reflection mode holograms are wavelength multiplexed to form gratings lying along a common axis. It is shown that this configuration provides substantial improve ...


3
George A Rakuljic, Victor Leyva: Methods and devices for using photorefractive materials at infrared wavelengths. Accuwave Corporation, Merchant Gould Smith Edell Welter & Schmidt, February 13, 1996: US05491570 (57 worldwide citation)

A method of writing plane holographic gratings Bragg-matched for reflection in the infrared in a photorefractive material using shorter wavelength light through a face perpendicular to the grating planes. The writing beam wavelength is selected to be within the photorefractive sensitivity range of t ...


4
Victor Leyva, George A Rakuljic: Fixing method for narrow bandwidth volume holograms in photorefractive materials. Accuwave Corporation, Merchant Gould Smith Edell Welter & Schmidt, August 2, 1994: US05335098 (42 worldwide citation)

An improved method for storing permanent holographic gratings in photorefractive materials for use in narrow band filters such as the H.sub.60 filter, as well as the filters themselves. The invention also provides an improved method of controlling the electric field and the nature of the photorefrac ...


5
Anthony S Kewitsch, George A Rakuljic, Amnon Yariv: Wavelength selective optical couplers. Arroyo Optics, Jones Tullar & Cooper PC, September 8, 1998: US05805751 (41 worldwide citation)

A wavelength selective optical fiber coupler having various applications in the field of optical communications is disclosed. The coupler is composed of dissimilar waveguides in close proximity. A light induced, permanent index of refraction grating is recorded in the coupler waist. The grating filt ...


6
Anthony S Kewitsch, George A Rakuljic, Amnon Yariv: Wavelength selective optical devices. Arroyo Optics, Jones Tullar & Cooper PC, February 23, 1999: US05875272 (36 worldwide citation)

Wavelength selective devices and subsystems having various applications in the field of optical communications are disclosed. These devices and subsystems are composed of bi-directional grating assisted mode couplers. The high add/drop efficiency and low loss of this coupler enable low loss waveleng ...


7
Anthony S Kewitsch, George A Rakuljic, Amnon Yariv: Wavelength selective optical routers. Arroyo Optics, Jones Tullar & Cooper P C, March 13, 2001: US06201909 (32 worldwide citation)

Using the wavelength selectivity and low loss characteristics of optical couplers, in which index of refraction gratings in a non-evanescent waveguide merged region reflect only a selected wavelength band, signal switching and control systems of novel characteristics are provided for multi-wavelengt ...


8
Anthony S Kewitsch, George A Rakuljic: Electronically phase-locked laser systems. Telaris, Jones Tullar & Cooper P C, December 7, 2010: US07848370 (29 worldwide citation)

Semiconductor diode lasers are phase-locked by direct current injection and combined to form a single coherent output beam. The optical power is amplified by use of fiber amplifiers. Electronically control of the optical phases of each emitter enables power efficient combining of output beams to be ...


9
Anthony S Kewitsch, George A Rakuljic, Amnon Yariv: Wavelength selective optical couplers. Arroyo Optics, Jones Tullar & Cooper P C, September 18, 2001: US06289699 (27 worldwide citation)

A wavelength selective optical fiber coupler having various applications in the field of optical communications is disclosed. The coupler is composed of dissimilar waveguides in close proximity. A light induced, permanent index of refraction grating is recorded in the coupler waist The grating filte ...


10
Anthony S Kewitsch, George A Rakuljic, Doruk Engin, Seth J Greenberg, Phil A Willems, Xiaolin Tong: Methods of fabricating grating assisted coupler devices. Arroyo Optics, Jones Tullar & Cooper P C, January 2, 2001: US06169830 (23 worldwide citation)

Advantageous methodologies are disclosed for embedding periodic patterns in optical waveguide elements such as optical fibers. Polarization independence in an elongated waist region of an add/drop coupler can be established by measuring polarization characteristics during fusion and elongation, and ...