摘要:
A coherence multiplexed optical signal transmission system in which modulation is introduced into the system by modulating the optical carrier or source signal, rather than by modulating the optical path length of an interferometer arm. The system comprises a transmitter and receiver interconnected by an optical bus. The transmitter comprises a plurality of transmitter interferometers, each transmitter interferometer including a modulated optical source. The transmitter interferometers have optical path length differences that are greater than the coherence length of the associated source, and that differ from one another by an amount greater than the source coherence length. The receiver comprises a plurality of receiver interferometers having path length differences matching those of the transmitter interferometers. Multiplexing and demultiplexing means are provided for coupling optical radiation between the bus and the interferometers. A detection system is provided that includes an output terminal associated with each receiver interferometer. For each receiver interferometer, an output signal is produced at the associated output terminal when the optical radiation coupled into the receiver interferometer includes a component that has passed through a transmitter interferometer having an output path length difference equal to the optical path length difference of the receiver interferometer, to within the coherence length of the associated source.
摘要:
A programmable optical arithmetic/logic device employs a first and second plurality of positionally encoded optical light paths. For arithmetic operations, these light paths represent residue numbers. The arithmetic/logic device includes first and second reordering units which are responsive to a third and fourth plurality of light sources serving to select one of a plurality of arithmetic or logic operations to be performed by the arithmetic/logic device. The arithmetic/logic device further employs an optical arithmetic/logic unit which is identically constructed for all of the selectable arithmetic/logic operations and which implements an optical table look-up function to obtain the desired output. Finally, the arithmetic/logic device used an output reordering device to reorder the output of the arithmetic/logic unit depending upon the originally selected arithmetic/logic operation. For arithmetic operations, the final output is provided as an output residue number representation.
摘要:
A semiconductor device is disclosed in which a long interaction path length is provided for a non-invasive probe beam. In a preferred embodiment, mirror surfaces are etched in the surface of the semiconductor substrate which are used to reflect the probe beam along the longest dimension of a charge carrier region of the semiconductor device. Interaction between the probe beam and the charge carriers present in the region is thereby enhanced.
摘要:
A fully optical A/D converter is disclosed in which the difference in light intensity from two outputs of a two-arm interferometer in each channel is detected. The difference in light intensity is varied in accordance with a phase shift in the light passing through one arm of the interferometer. The phase shift is accomplished by the use of a non-linear optical material, the optical properties of which are altered based on the characteristics of an input optical signal to be digitized. Thus, the difference in light intensity corresponds to the magnitude of the input optical signal.
摘要:
A technique for producing an integrated optics waveguide having a large index of refraction difference with respect to an otherwise similar waveguide that does not utilize the invention. A proton exchange region is formed in a lithium niobate substrate, and a titanium waveguide is formed in the substrate within the proton exchange region. The dimensions of the waveguide and proton exchange region are selected such that substantially all of the field of the lowest guided mode of the waveguide is contained within the proton exchange region. By utilizing such a waveguide as one arm of an interferometer formed in the substrate, a large optical path length difference between the interferometer arms may be created.
摘要:
A lamp that produces an infinitely variable range of time, space, and color patterns. The lamp includes a plurality of colored light sources that produce light in at least two different visual spectrums, a single modulation device that generates a modulation scheme for each of the plurality of light sources, a display screen, and a mask that masks off at least a portion of light illuminating the display screen. The generated modulation scheme is produced at a predefined intensity level. A controller selectively alters delivery of the modulation scheme to each of the plurality of light sources. A first switch allows a user to select one of a plurality of modulation schemes. A second switch allows a user to alter the predefined intensity level. A third switch allows a user to select one of a plurality of modulation rates.
摘要:
An apparatus for analyzing an integrated circuit to which one or more test signals are applied. An example apparatus includes an objective lens that views reflections from the integrated circuit, a device that houses at least two optical fibers, a component that receives reflections from the objective lens and directs the received reflections to the device, and a photo-diode that receives a reflection received by the device. The apparatus includes a beam splitter that directs reflections from the integrated circuit to a detector. A processing device generates an image signal based on a signal received from the detector and a display outputs an image based on the image signal. The component includes a scan mirror that reflects the collimated reflections to a collimating lens that focuses the reflections from the scan mirror toward the device.
摘要:
A large, thin, variable focus lens that would be practical in a variety of applications, such as eyeglasses. An example of the present invention is a surface that can be deformed to a desirable shape in a simple, controllable fashion. In particular, a surface shape with desirable optical properties is achievable. The surface has the ability to produce a reflective or refractive surface with a variable optical power.
摘要:
An avalanche semiconductor switch device utilizes trigger input. The integrated trigger input is a charge carrier injector which injects charge carriers directly into the avalanche semiconductor switch device. The avalanche semiconductor switch device includes: an active, semi-insulating layer; an anode; a cathode; and an injector disposed on the anode contact. The injector serves to switch the device into a state of very high conductance when a positive bias is applied to the injector. The integrated trigger input allows low power optical sources to be used with the avalanche semiconductor switch device further back in the trigger chain. The injector may inject holes or electrons. The injector may be integrated on one side of the substrate.
摘要:
An encryption and decryption system performs encryption and decryption using the residue number system. A binary input signal is converted into residue number system representation in a binary to residue converter. Pseudo random numbers, generated from pseudo random number generators, are then added to the converted input signal in modular, that is, residue number system, adders. The outputs of the modular adders are converted into binary or mixed radix digit representation and are then transmitted to the location of a decrypter. The transmitted binary or mixed radix digit signal is converted back into residue number system representation in another converter and is then decrypted by subtracting the pseudo random number sequence. This decrypted signal is then converted into binary representation. The binary representation of the decrypted signal resembles the input signal.