Abstract:
Fiber Bragg gratings of low reflectivity are given a squared reflectivity function in the form of a tophat configuration having a flat top and lacking undesirable side lobes (12). Such a reflectivity function for a fiber Bragg grating is achieved by interfering a diffracted beam (20) with a plane wavefront beam so as to impose a sinc function on the resulting interference pattern that imprints the grating on an optical fiber (10).
Abstract:
A Mach-Zehnder filter is provided with a strongly aperiodic transfer function including a broad, sharply defined passband. The filter can be used in conjunction with optical amplifiers.
Abstract:
A combination of dispersion flattened single mode optical waveguide fiber (14) and soliton signal pulses (18, 20) yields an optimum telecommunication system capacity. The dispersion flattenend fiber (14) serves to relax tolerances on soliton center wavelength and intensity. In addition, the inventive combination facilitates the design and use of long haul systems using optical amplifiers (16).