Michael R. Matthews

Dispersion and dispersion-slope correction with a fiber Bragg grating over the full C-band

Long-length wide-bandwidth fiber Bragg gratings for use as dispersion compensators that cover the full C-band have been fabricated. These devices are shown to work well in a 10 Gbit/s NRZ optical communications system.

Dispersion correction with a robust fiber grating cover the full c-band at 10-gb/s rates with <0.3-dB power penalties

Robust wide-bandwidth fiber Bragg gratings have been produced for use as dispersion compensators that yield <0.3-dB power penalties due to distortion over an 80-km transmission fine of nonzero dispersion-shifted fiber in a 10-Gb/s nonreturn-to-zero optical communications system.

Polarization mode dispersion in chirped fiber Bragg gratings

We clarify the relationship between group delay ripple and differential group delay in birefringent, chirped fiber Bragg gratings and relate this information to polarization mode dispersion. We illustrate that a grating can be characterized completely by measuring the grating phase ripple and fiber birefringence with careful selection of measurement system parameters. The impact of these imperfections on device performance as dispersion compensators in optical communications systems is explored with system testbed simulations and measurements.

Simple model of errors in chirped fiber gratings

A simple etalon based model is presented to show the origin of the wavelength-dependent ripples in the group delay and phase, and in the intensity of optical signals reflected from chirped fiber gratings. The simplicity of the model allows intuitive understanding of the effects, and quantitative predictions. We derive accurate scaling laws that allow the experimenter to make quantitative connections between the grating writing process parameters and grating performance.

PMD measurement of dispersion compensation grating and its effect on system penalty estimation

Both direction and magnitude of the PMD vector of dispersion compensation grating must be considered when estimating its system penalty. We propose high bandwidth measurements to obtain 1st order PMD in these devices.