Novel bulk optic multichannel resonator device for close packed wavelength multiplexing.

A simple bulk optic structure is described that is suitable for multiplexing or demultiplexing many closely spaced wavelengths of light. Aside from input/output coupling hardware, the structure is comprised of a single glass, high finesse, Fabry-Perot etalon with a low efficiency diffraction grating etched into one face. The device concept provides a capability for multiplexing ratios in excess of 10, channel frequency separations smaller than 1 GHz, and can be designed to support optical networks having a total communication capacity in excess of 100 GHz. A laboratory model of the multiplexer was constructed and evaluated to demonstrate concept feasibility. The demonstration model, adjusted to demultiplex nine channels separated by 2.2 GHz for a total capacity of 20 GHz, exhibited a throughput optical coupling of -7 dB and a signal-to-crosstalk ratio greater than 15 dB.

Echelon grating multiplexers for hierarchically multiplexed fiber-optic communication networks.

Echelon gratings have many beneficial properties when used as the dispersing mechanism of a fiber-optic wavelength multiplexer including high optical dispersion, high optical efficiency, greatly reduced sensitivity to polarization, simultaneous utility on many wavelength bands, and a capability for hierarchical multiplexing. The use of echelon multiplexers in a hierarchical environment is discussed, and a prototype echelon multiplexer is constructed and used to demonstrate the unique capabilities of this device for creating wavelength division multiplexing systems.

Velocity synchronized fourier transform hologram camera system.

Methods for recording holograms of hypervelocity particles were studied. It was assumed that the particle would move an appreciable distance during the exposure time. The problem was to find a method of maintaining stationary hologram interference fringes as the object moved within the field of view. A Fourier transform method employing an interferometer and using a reference beam produced by back reflection from the object was found to be conceptually correct. The stationarity of the approach was demonstrated experimentally. It was also proven possible to change arbitrarily the position of the reconstructed image relative to the hologram axis.