Abstract:
A spectral-domain optical coherence tomography system using a cross-dispersed spectrometer is disclosed. The interfered optical signal is dispersed by a grating into several orders of diffraction, and these orders of diffraction are separated by an additional dispersive optical element. The spectral interferogram is recorded by a set of linear detector arrays, or by a two-dimensional detector array.
Abstract:
Methods for generating a customized spectral profile, which can be used to generate a corresponding filter. A trial source spectrum is generated. An uncorrected lamp source spectrum is determined. One or more optical indices are calculated using the trial source spectrum or the uncorrected lamp source spectrum, and one or more of the optical indices are optimized by varying the trial source spectrum to generate the customized spectral profile.
Abstract:
There is provided spectral discrimination apparatus for use in a scanning optical microscope, the spectral discrimination apparatus comprising dispersive means (31) and frequency selective means including a rotatable disc (36) or discs. The discs are formed with apertures or spiral slots which, on rotation of the disc or discs, controls the frequency of light transmitted by the apparatus. The apparatus includes a detector (39) for receiving light from the frequency selective means. The, or each, rotatable disc (36) is positioned at an aperture plane after the dispersive means (31), although this is not essential if the rotatable disc has its outer periphery shaped to provide a cam surface engaged by a cam follower. There is also provided a method of spectral discrimination in a scanning optical microscope, comprising dispersing the light and passing the light through frequency selective means in which the form of rotating discs controls the frequency of transmitted light.
Abstract:
Eine Spektrometer-Anordnung (10) enthält eine Strahlungsqeulle (11) mit kontinuierlichem Spektrum, einen Vormonochromator (2) zur Erzeugung eines Spektrums mit relativ geringer Lineardispersion aus welchem ein Spektrenausschnitt selektierbar ist, dessen spektrale Bandbreite kleiner oder gleich der Bandbreite des freien Spektralbereiches derjenigen Ordnung im Echelle-Spektrum ist, in der die Mittenwellenlänge des selektierten Spektrenausschnitts mit maximaler Blazeeffektivität messbar ist, ein Echelle-Spektrometer (4) mit Mitteln zur Wellenlängenkalibrierung, einen Eintrittsspalt (21) an dem Vormonochromator (2), eine Zwischenspalt-Anordnung (3) mit einem Zwischenspalt und einen ortsauflösenden Strahlungsempfänger (5) in der Austrittsebene des Spektrometers zur Detektion von Wellenlängen-Spektren. Die Anordnung ist dadurch gekennzeichnet, daβ die Breite des Zwischenspalts (3) gröβer ist, als das durch den Vormonochromator am Ort des Zwischenspaltes entstehende monochromatische Bild des Eintrittspaltes und Mittel zur Kalibrierung des Vormonochromators vorgesehen sind, durch welche die auf den Detektor abgebildete Strahlung der Strahlungsquelle mit kontinuierlichen Spektrum auf eine Referenzposition kalibrierbar ist.
Abstract:
An optical system for performing a spectral analysis of test samples comprising is provided. The optical system comprises a photonic energy source, an optical emission processing system, a received light optical processing system, an optical detector and a digital signal processing system. The photonic energy source emits electromagnetic radiation and is controlled by a digital signal processing system. The optical emission processing system receives electromagnetic radiation from the photonic energy source and transmits one or more illumination wavelengths to a test sample, wherein the optical emission processing system is controlled by the digital signal processing system. The received light optical processing system collects and isolates one or more wavelengths of received electromagnetic radiation from the test sample and transmits the isolated one or more wavelengths of received electromagnetic radiation to an optical detector. The received light optical processing system is also controlled by the digital signal processing system. The optical detector senses and converts the isolated one or more wavelengths of received electromagnetic radiation into an electrical signal which is transmitted to the digital signal processing system. The digital signal processing system performs matched filtering of the electrical signal received from the optical detector and additionally controls the functionality of the photonic energy source, the optical emission processing system and the received light optical processing system.
Abstract:
A wavelength division multiplexer/demultiplexer (WDM) for use in an optical network and in an optical performance monitor that minimizes increases in insertion losses over temperature variations. The WDM has a structure for holding at least one optical component. A diffraction grating assembly having a substrate is held in relation to the at least one optical component by the structure. A lens assembly having a focal length is held in relation to the at least one optical component. The coefficient of thermal expansion of the lens assembly and structure are approximately equal. The lens assembly is constructed from a material chosen to minimize its variance in focal length over temperature. The grating assembly has an angular dispersion that changes with temperature and the product of the focal length and angular dispersion remains constant over temperature. The WDM further comprises a prism having a change in index of refraction with temperature that is approximately equal to a negative of a coefficient of thermal expansion of the substrate. The substrate has a coefficient of thermal expansion approximately equal to a negative of a coefficient of thermal expansion of air.
Abstract:
Light from an object (152) moving through an imaging system (154) is collected, dispersed, and imaged onto a time delay integration (TDI) detector (148) that is inclined relative to an axis of motion of the object, producing a pixilated output signal. In one embodiment, the movement of the image object over the TDI detector (148) is asynchronous with the movement of the output signal producing an output signal that is a composite of the image of the object at varying focal point along the focal plane. In another embodiment, light from the object is periodically incident on the inclined TDI, producing a plurality of spaced apart images and corresponding output signals that propagate across the TDI detector (148). The inclined plane enables images of FISH probes or other components within an object to be produced at different focal point, so that the 3D spatial relationship between the FISH probes or components can be resolved.
Abstract:
A device for monitoring wavelength division multiplexed optical signals for use in an optical network and in an optical performance monitor. A device has a structure for supporting components of the device. An optical component is supported at one end of the structure for transmitting the optical signals. A diffraction grating is supported at an opposing end of the structure for diffracting the optical signals from the optical component. An optical sensor is supported in relation to the diffraction grating by the structure for monitoring the optical signals. A telephoto lens assembly is supported by the structure and disposed between the optical sensor and the diffraction grating, the lens assembly having a focal length for focusing the optical signals in relation to the optical sensor. Thermal effects on the structure are balanced against thermal effects on the lens assembly. A prism is disposed between the lens assembly and diffraction grating. The prism is configured to anamorphically compress the diffracted optical signals. Thermal effects on the diffraction grating are balanced against thermal effects on the lens and prism.
Abstract:
An optical performance monitoring device and corresponding diffraction grating are disclosed for utilization within a fiber optic communications network. The diffraction grating includes a substrate and reflective material adjacent the substrate, wherein the diffraction grating is substantially polarization insensitive over a wavelength range of approximately 30nm.
Abstract:
A device for monitoring wavelength division multiplexed optical signals for use in an optical network and in an optical performance monitor. A device has a structure for supporting components of the device. An optical component is supported at one end of the structure for transmitting the optical signals. A diffraction grating is supported at an opposing end of the structure for diffracting the optical signals from the optical component. An optical sensor is supported in relation to the diffraction grating by the structure for monitoring the optical signals. A telephoto lens assembly is supported by the structure and disposed between the optical sensor and the diffraction grating, the lens assembly having a focal length for focusing the optical signals in relation to the optical sensor. Thermal effects on the structure are balanced against thermal effects on the lens assembly. A prism is disposed between the lens assembly and diffraction grating. The prism is configured to anamorphically compress the diffracted optical signals. Thermal effects on the diffraction grating are balanced against thermal effects on the lens and prism.