Abstract: A system comprises of a pulse oximeter and diffusing wave spectroscopy (DWS) apparatus to perform pulse oximetry measurements. To calculate oxygen saturation, the pulse oximeter utilizes a pulse wave which is measured by an apparatus other than the pulse oximeter itself. In one embodiment, the different apparatus mentioned above is the diffusing wave spectroscopy (DWS) apparatus.

Abstract: There is provided herewith an apparatus, probe, and method for the combination of near-infrared spectroscopy (NIRS) and diffuse correlation spectroscopy (DCS). The apparatus, probe and method allow for the simultaneous detection of NIRS and DCS.

Abstract: The present disclosure relates in general to Diffuse Correlation Spectroscopy system for obtaining an autocorrelation function, and more particular, to a correlator and method for controlling a sampling time period and data length used for calculating an autocorrelation function. The correlator may include, a sampling gate circuit which is open during a variable time period and provides a data sample, a correlation circuit which calculates a correlation function from the data sample provided from the sampling gate circuit, and a parameter determining circuit which determines a sampling time period to be used by the sampling gate circuit based on the correlation function.

Abstract: Exemplary apparatus and methods are provided for analyzing a medium. The apparatus, which may be a diffusing wave spectroscopy apparatus, comprises a first beam splitter for splitting a light from the laser light source into an excitation light and a reference light. The excitation light is directed on to a first portion of the medium and then multiply scattered light is collected at a second portion of the medium, the second portion being different from the first portion. The reference light, which has been attenuated, is combined with the multiply scattered light and either a power spectrum or an autocorrelation function is calculated.

Abstract: One or more spectrally encoded endoscopy (SEE) devices, systems, methods and storage mediums for characterizing, examining and/or diagnosing, and/or measuring viscosity of, a sample or object using speckle detection are provided. Examples of such applications include imaging, evaluating and diagnosing biological objects, such as, but not limited to, for Gastro-intestinal, cardio and/or ophthalmic applications, and being obtained via one or more optical instruments. Preferably, the SEE devices, systems methods and storage mediums include or involve speckle intensity autocorrelation function(s). One or more embodiments involve a serial time-encoded 2D imaging system with speckle detection to reconstruct images, store reconstructed images of the sample or object, and/or measure viscosity of the sample or object.

Abstract: A system comprises of a pulse oximeter and diffusing wave spectroscopy (DWS) apparatus to perform pulse oximetry measurements. To calculate oxygen saturation, the pulse oximeter utilizes a pulse wave which is measured by an apparatus other than the pulse oximeter itself. In one embodiment, the different apparatus mentioned above is the diffusing wave spectroscopy (DWS) apparatus.

Abstract: The present disclosure relates in general to Diffuse Correlation Spectroscopy system for obtaining an autocorrelation function, and more particular, to a correlator and method for controlling a sampling time period and data length used for calculating an autocorrelation function. The correlator may include, a sampling gate circuit which is open during a variable time period and provides a data sample, a correlation circuit which calculates a correlation function from the data sample provided from the sampling gate circuit, and a parameter determining circuit which determines a sampling time period to be used by the sampling gate circuit based on the correlation function.

Abstract: A DWS apparatus includes a coherent light source, a photodetector, a control unit which can measure an intensity autocorrelation function, a measuring unit which can measure a source-detector distance to obtain source-detector distance data, and a calibrating unit which adjusts the intensity autocorrelation function by using the source-detector distance data. The calibrating unit calibrates the intensity autocorrelation function by adjusting the time constant of the autocorrelation function based on a comparison of the source-detector distance to the time constant of the intensity autocorrelation function.

Abstract: One or more spectrally encoded endoscopy (SEE) devices, systems, methods and storage mediums for characterizing, examining and/or diagnosing, and/or measuring viscosity of, a sample or object using speckle detection are provided. Examples of such applications include imaging, evaluating and diagnosing biological objects, such as, but not limited to, for Gastro-intestinal, cardio and/or ophthalmic applications, and being obtained via one or more optical instruments. Preferably, the SEE devices, systems methods and storage mediums include or involve speckle intensity autocorrelation function(s). One or more embodiments involve a serial time-encoded 2D imaging system with speckle detection to reconstruct images, store reconstructed images of the sample or object, and/or measure viscosity of the sample or object.

Abstract: Exemplary apparatus and methods are provided for analyzing a medium. The apparatus, which may be a diffusing wave spectroscopy apparatus, comprises a first beam splitter for splitting a light from the laser light source into an excitation light and a reference light. The excitation light is directed on to a first portion of the medium and then multiply scattered light is collected at a second portion of the medium, the second portion being different from the first portion. The reference light, which has been attenuated, is combined with the multiply scattered light and either a power spectrum or an autocorrelation function is calculated.

Abstract: There is provided herewith an apparatus, probe, and method for the combination of near-infrared spectroscopy (NIRS) and diffuse correlation spectroscopy (DCS). The apparatus, probe and method allow for the simultaneous detection of NIRS and DCS.

Abstract: An optical tomography device 1 is provided as one capable of obtaining tomographic information of a measuring object with higher accuracy. In the optical tomography device 1, numerical apertures of reception fibers 12, 13 are different from each other. Therefore, the device has a configuration wherein the reception fibers 12, 13 receive two kinds of respective light beams with different solid angle distributions, whereby the device can also obtain angular information, in addition to intensity information of light emerging from a measuring object 100. As a result, the accuracy is enhanced for an analysis about the tomographic information of the measuring object.

Abstract: An optical tomography device 1 is provided as one capable of obtaining tomographic information of a measuring object with higher accuracy. In the optical tomography device 1, numerical apertures of reception fibers 12, 13 are different from each other. Therefore, the device has a configuration wherein the reception fibers 12, 13 receive two kinds of respective light beams with different solid angle distributions, whereby the device can also obtain angular information, in addition to intensity information of light emerging from a measuring object 100. As a result, the accuracy is enhanced for an analysis about the tomographic information of the measuring object.

Abstract: An optical line monitoring apparatus and optical line monitoring system which can measure a reflectance distribution in an optical line with a high spatial resolution in a short time are provided. An optical line monitoring apparatus 14A provided in a station 10A comprises an OCDR measurement section 15 for carrying out OCDR measurement, an OTDR measurement section 16 for carrying out OTDR measurement, an optical switch 13 for selectively connecting one of the OCDR measurement section 15 and OTDR measurement section 16 to the optical coupler 12, a control section 17, and a storage device 18. The control section 17 performs a predetermined arithmetic operation according to an OCDR measurement result acquired by causing the OCDR measurement section 15 to carry out the OCDR measurement and an OTDR measurement result acquired by causing the OTDR measurement section 16 to carry out the OTDR measurement.

Abstract: An optical line monitoring apparatus and optical line monitoring system which can measure a reflectance distribution in an optical line with a high spatial resolution in a short time are provided. An optical line monitoring apparatus 14A provided in a station 10A comprises an OCDR measurement section 15 for carrying out OCDR measurement, an OTDR measurement section 16 for carrying out OTDR measurement, an optical switch 13 for selectively connecting one of the OCDR measurement section 15 and OTDR measurement section 16 to the optical coupler 12, a control section 17, and a storage device 18. The control section 17 performs a predetermined arithmetic operation according to an OCDR measurement result acquired by causing the OCDR measurement section 15 to carry out the OCDR measurement and an OTDR measurement result acquired by causing the OTDR measurement section 16 to carry out the OTDR measurement.

Abstract: A dental diagnostic OCT system capable of diagnosis of dental caries existing at the approximal surfaces of teeth, comprising a light source, a beam splitter, a mirror, a photo detector, a lens, an optical fiber, and a probe. A filler having a refractive index larger than the refractive index of air and smaller than that of an object of diagnosis is to be filled between the tip portion of the probe and approximal surfaces of teeth, i.e., objects of diagnosis. The light output from the tip portion of the probe is irradiated to the objects of diagnosis via the filler, and the sample light occurring upon such irradiation is input into the tip portion of the probe via the filler. The intensity of light which the beam splitter outputs by combining the sample light and the reference light is detected by the photo detector, and thereby the teeth as the objects of diagnosis are diagnosed.

Abstract: The present invention relates to an optical amplifier with a structure for more effectively suppressing the over/undershoot in transient responses in high-speed AGC. This optical amplifier is an optical device for amplifying signal light inputted therein, and comprises a rare-earth-element-doped optical fiber, an optical coupler, a light-receiving section, a pumping light source, and a control section. In particular, as a typical structure of the optical amplifier, the rare-earth-element-doped optical fiber has a cutoff wavelength ?c set longer than the pumping light wavelength ?p but shorter than the signal light wavelength ?s, and mainly allows a pumping light component in a fundamental mode to propagate therethrough.

Abstract: An object of the present invention is to provide an optical measuring device and optical measuring method capable of locally irradiating a measuring object with light and efficiently receiving reflection, scattered light, fluorescence, etc. from the measuring object. An optical measuring device according to the present invention has a light emitting portion; an irradiation waveguide for guiding light from the light emitting portion toward an object; a receiving waveguide for guiding light from the object; and a light receiving portion for receiving the light having been guided through the receiving waveguide; and is characterized in that a numerical aperture at a receiving end of the receiving waveguide is larger than a numerical aperture at an emission end of the irradiation waveguide.

Abstract: The present invention relates to an optical amplifier with a structure for more effectively suppressing the over/undershoot in transient responses in high-speed AGC. This optical amplifier is an optical device for amplifying signal light inputted therein, and comprises a rare-earth-element-doped optical fiber, an optical coupler, a light-receiving section, a pumping light source, and a control section. In particular, as a typical structure of the optical amplifier, the rare-earth-element-doped optical fiber has a cutoff wavelength ?c set longer than the pumping light wavelength ?p but shorter than the signal light wavelength ?s, and mainly allows a pumping light component in a fundamental mode to propagate therethrough.

Abstract: A Raman amplifier can easily reduce the gain variation in Raman amplification even when the power of an input signal varies. The Raman amplifier is provided with (a) an optical fiber that Amplifies an input lightwave to produce an output lightwave, (b) a pump-lightwave-supplying means that supplies pump lightwaves having a plurality of wavelengths to the optical fiber, and (c) a control unit that controls only the power of the pump lightwave having the shortest wavelength among the pump lightwaves so that the average value of the gain of the Raman amplification by the optical fiber in an intended wavelength range can be maintained constant.