Omniguide Communications

Massachusetts Institute of Technology

Omniguide, Inc.

Cambrius, Inc.

Maksim Skorobogatiy

Steven G Johnson

Marin Soljacic

Ori Weisberg

Yoel Fink

Mihai Ibanescu

Torkel Engeness

John Dimitris Joannopoulos

Steven Alan Jacobs

Lori Pressman

Wesley A King

Emilia G Anderson

Rokan Ahmad

Michael Hong Lim

Uri Kolodny

Dale G Fried

Jean-Francois Viens

Evan J Reed

James S Foresi

John D Joannopolous

In general, in one aspect, the invention features an apparatus that includes a photonic crystal fiber configured to guide a mode of electromagnetic radiation at a wavelength, &#x3bb;, along a waveguide axis. The fiber includes a core extending along the waveguide axis, and a confinement region extending along the waveguide axis and surrounding the core. The confinement region includes alternating layers of a first and a second dielectric material having thicknesses dand dand different refractive indices nand n, respectively. The thickness of at least one of the alternating layers of the first material differs from thickness dor at least one of the alternating layers of the second material differs from thickness d, where dand dcorrespond to a quarter-wave condition for the two dielectric materials given by d=&#x3bb;/(4&#x221a;{square root over (n&#x2212;1)}) and d=&#x3bb;/(4&#x221a;{square root over (n&#x2212;1)}), respectively. The photonic crystal fiber has an attenuation for the guided mode at the wavelength &#x3bb; that is reduced by a factor of about two or more relative to an attenuation for a reference fiber that is identical to the photonic crystal fiber except that the reference fiber has alternating layer thicknesses corresponding to the quarter-wave condition.

Photonic crystal waveguides and systems using such waveguides

A device for converting frequency of electromagnetic radiation includes a nonlinear medium that forms a moving grating in the nonlinear medium by introducing at opposite ends of the nonlinear medium a first set of electromagnetic radiation having varying frequencies. Electromagnetic radiation is inputted into the nonlinear medium at a first frequency and extracted at a second frequency from the nonlinear medium. The moving grating in the nonlinear medium allows for electromagnetic radiation to be converted into the second frequency.

Shock-wave modulation and control of electromagnetic radiation

An optical waveguide including: a dielectric core region extending along a waveguide axis; and a dielectric confinement region surrounding the core about the waveguide axis, the confinement region comprising a photonic crystal structure having a photonic band gap, wherein during operation the confinement region guides EM radiation in at least a first range of frequencies to propagate along the waveguide axis, wherein the core has an average refractive index smaller than about 1.3 for a frequency in the first range of frequencies, and wherein the core a diameter in a range between about 4&#x3bb; and 80&#x3bb;, wherein &#x3bb; is a wavelength corresponding to a central frequency in the first frequency range.

Low-loss photonic crystal waveguide having large core radius

By judicious engineering of grating parameters such as tooth shape, duty cycle and phase offset, the grating strengths and effective indices of the polarization modes of a grated waveguide are adjusted over a wide range of values to achieve a desired level of polarization sensitivity, or insensitivity. In the typical example, the physical geometry of the grating teeth is adjusted so that degenerate behavior (n=nand &#x3ba;=&#x3ba;) is obtained for two polarization modes; the effective refractive indices and grating strengths are matched for the TE and TM polarization modes. In the current embodiment the sidewall gratings are used in which the tooth profile is selected in order to equalize the grating strength for each polarization mode.

Periodic electromagnetic waveguide structures with controlled polarization properties

High index-contrast fiber waveguides, materials for forming high index-contrast fiber waveguides, and applications of high index-contrast fiber waveguides are disclosed.

High index-contrast fiber waveguides and applications

An optical waveguide having a working mode with a tailored dispersion profile, the waveguide including: (i) a dielectric confinement region surrounding a waveguide axis, the confinement region comprising a photonic crystal having at least one photonic bandgap, wherein during operation the confinement region guides EM radiation in a first range of frequencies to propagate along the waveguide axis; (ii) a dielectric core region extending along the waveguide axis and surrounded by the confinement region about the waveguide axis, wherein the core supports at least one guided mode in the first frequency range; and (iii) a dielectric dispersion tailoring region surrounded by the confinement region about the waveguide axis, wherein the dispersion tailoring region introduces one or more additional modes in the first range of frequencies that interact with the guided mode to produce the working mode.

Photonic crystal optical waveguides having tailored dispersion profiles

An optical waveguide including: a dielectric core region extending along a waveguide axis; and a dielectric confinement region surrounding the core about the waveguide axis, the confinement region comprising a photonic crystal structure having a photonic band gap, wherein during operation the confinement region guides EM radiation in at least a first range of frequencies to propagate along the waveguide axis, wherein the core has an average refractive index smaller than about 1.3 for a frequency in the first range of frequencies, and wherein the core a diameter in a range between about 4 &lgr; and 80 &lgr;, wherein &lgr; is a wavelength corresponding to a central frequency in the first frequency range.

Growing community of inventors

Brighton, MA, United States of America

Maksim Skorobogatiy