Massachusetts Institute of Technology

Other

3m Innovative Properties Company

Patrick C Chou

Hermann A Haus

James Francis Brennan, Iii

Rajeev J Ram

John Michael Fini

Dwayne L LaBrake

Erich P Ippen

Harry L T Lee

Dwayne L Labrake

A real-time optical compensating apparatus reduces the PMD in an optical fiber by determining the principal states of polarization of the optical fiber and delaying one principal state of polarization with respect to the other.

Compensating polarization mode dispersion in fiber optic transmission systems

A method and apparatus are provided for generating short (e.g., picosecond) pulses using a 2 section 1553 nm DBR laser without gain switching nor external modulation. The center wavelength of the DBR section is modulated at 0.5 GHz to generate a constant amplitude frequency modulated optical wave Large group velocity dispersion is then applied with a chirped fiber Bragg grating to convert the FM signal to a pulse stream.

Method and apparatus for generating frequency modulated pulses

Compensating polarization mode dispersion in fiber optic transmission system

A method and an apparatus for stretching an optical pulse and shaping its spectrum. The method includes the step of: providing a an optical fiber element having a first long length fiber Bragg grating having a refractive index perturbation of varying periodicity. The optical pulse is launched into the fiber Bragg grating, wherein the Bragg grating reflects the pulse in a chromatically dispersed output. The reflected output is coupled with an optical modulator programmed to temporally modify the amplitude of the chromatically dispersed output to attenuate selected optical frequencies in a desired pattern. The apparatus for stretching and arbitrarily shaping the spectrum of an optical pulse with a desired wavelength resolution &Dgr;&lgr;,includes a routing optical device and an optical fiber element having a Bragg grating. The routing optical device routs energy between different waveguides, and has an input port to receive the optical pulse.

Method and apparatus for arbitrary spectral shaping of an optical pulse

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Fremont, CA, United States of America

Patrick C Chou