We examine a method of digital holography to analyze three- dimensional (3D) scenes. We present a method for recognizing objects in 3D scenes using single exposure digital holography that can be used to detect the presence and position of a three-dimensional object within the scene as well as detect if it has an out of plane rotation. The use of a single hologram allows for a more practical implementation in real world applications such as those involving moving targets or those applications where noise is involved. Correlation methods are used to recognize the 3D reference object within the 3D scene and detect the position of that object.
We explore the effect of auxiliary cavities on various schemes used in modeling fiber laser systems having a main cavity and an auxiliary. These include the effects of incorporating a) passive elements and b) active elements in the auxiliary cavity for actively modelocked, passively modelocked, as well as Raman fiber lasers. The focus is on the enhancement of laser performance including stability, pulse compression and pulse repetition rate. The study shows that incorporating external cavity greatly enhances the operating range as well as performance of fiber laser systems. Pulse widths ranging from femtosecond to picoseconds (20fs to 20ps) have been reported, pulse repetition rates from kilohertz to gigahertz (40KHz to 40GHz), and noise reduction and instability reduction (30 to 140 dBc/Hz) have been reported. In addition incorporating auxiliary cavity allows for design flexibility using cavity dynamics, parametric control, nonlinear effects, pulse shaping, gain switching, and noise dynamics.
There is demand for high-sped all-optical networks for the next generation internet that can transport the data header and packet of information at rates of between 40-100 Gb/s. Such networks will require high bandwidth and high-speed data transport. DWFM has been proposed as a viable scheme to implement such networks. Recently we reported the generation of optical subcarrier frequencies having bandwidth of the order of 2.5-3 terahertz. We prose a scheme for the design of high-density optical networks, in which the header is carried over the subcarrier frequencies and the packets are carried over the optical wavelengths. This scheme has many advantages, for example, it can allow for separate processing of header and packet, as well as provide higher bandwidth and high-speed data transport. We shall discuss the generation scheme for the terahertz optical subcarriers, a modulation scheme for these carriers, and how they are multiplexed in an all-optical network architecture.
We demonstrate generation of gigahertz to terahertz optical subcarrier radio frequencies in semiconductor optical amplifiers. The circuit arrangement consists of a laser diode riven below its lasing threshold to generate spontaneous emission spectrum. The spontaneous emissions are passed in a saturation driven semiconductor optical amplifier with low-end reflectivity. A fraction of the output signal emerging from the amplifier is fed back into the input of the amplifier. By appropriately arranging the phases of the input and the feedback signals, beat frequencies up to 3.75 THz were generated.
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