University of Southern California

Case Western Reserve University

Kai-Ming Feng

Alan Eli Willner

Jin-Xing Cai

Jack L Feinberg

Victor E Grubsky

Dmitry S Starodubov

Sanggeon Lee

Shouhua Huang

Reza Khosravani

Xingyu Zou

David Arthur Smith

Jin-Xin Cai

Alan E Wilner

Jiangde Peng

Dmtry Starodubov

Techniques and devices based on a wave-guiding element which has a spatial grating pattern that is an oscillatory variation along its optic axis. The wave-guiding element is configured to receive an input optical signal and to produce an output optical signal by reflection within a Bragg reflection band produced by the spatial grating pattern so as to produce time delays of different reflected spectral components as a nonlinear function of spatial positions along said optic axis at which the different reflected spectral components are respectively reflected. Such a wave-guiding element may be a nonlinearly chirped fiber grating A control unit may be engaged to the wave-guiding element and is operable to change a property of the spatial grating pattern along the optic axis to tune at least relative time delays of the different reflected spectral components nonlinearly with respect to wavelength.

Tuning of optical dispersion by using a tunable fiber bragg grating

A dynamic power equalization module ( ) for an optical network is provided. It includes a module input ( ) for receiving an optical transmission ( ) containing a combination of different channels (C -C ). Each channel (C -C ) has a different characteristic wavelength (&lgr; -&lgr; ) and different varying power. A power equalization device that is polarization insensitive is connected between the module input ( ) and a module output ( ). The power equalization device is driven by RF acoustic signals ( ). A feedback loop ( ) receives at least a portion of output from the module output ( ) and generates, based upon a comparison of relative powers of the different channels (C -C ), the RF acoustic signals ( ) which drive the power equalization device. The power equalization device is driven such that it dynamically controls transmission of the different channels (C -C ) to substantially equalize power differentials therebetween. The power equalization device includes a parallel array of acousto-optic modulators (AO -AO ).

Dynamic power equalization of many wavelength-division-multiplexed channels in a fiber-optic system

A nonlinearly chirped fiber grating for achieving tunable dispersion compensation, dispersion slope compensation, polarization mode dispersion, chirp reduction in directly modulated diode lasers, and optical pulse manipulation. A dynamical dispersion compensation mechanism can be implemented in a fiber communication system based on such a nonlinearly chirped fiber grating.

Disperson compensation by using tunable nonlinearly-chirped gratings

A nonlinearly chirped fiber grating for achieving tunable dispersion compensation, chirp reduction in directly modulated diode lasers, and optical pulse manipulation. A dynamical dispersion compensation mechanism can be implemented in a fiber communication system based on such a nonlinearly chirped fiber grating.

Tunable nonlinearly chirped grating

Growing community of inventors

Alhambra, CA, United States of America

Kai-Ming Feng