Abstract:
A method that allows a plurality of variables to be measured with the aid of an integrated optical sensor module. Because all the components necessary for carrying out the method are integrated on the same substrate, the sensor becomes small, compact, stable, malfunction-free and economical. The sensor module substantially comprises a sensor field, an analyzer, and an information field. The method comprises making the variables to be measured interact in sensor fields with guided waves, analyzing the effect on the wave, determining from that the value of the measuring variables, and displaying the results in the information field.
Abstract:
In an integrated optical interference method, polarized laser light is incoupled into a planar waveguide, propagates in the waveguide as a guided wave, which consists of two mutually coherent, orthogonally polarized modes, interacts at least once with the sample, which is applied to the surface of a section of the waveguide called measuring section, and subsequently is outcoupled out of the waveguide. The time dependent phase difference .DELTA..PHI.(t) between the two orthogonal polarization components of the outcoupled light is measured with a device comprising photodetectors and polarization optical components.
Abstract:
The invention is directed to a method for determining the refractive index (n) of a substance wherein monochromatic light is conducted to a single-mode wave guide integrated into a substrate. The wave guide is brought into contact with the substance to be measured along a segment of predetermined length. In this way, the effective refractive index in this segment of the wave guide is changed. This effect is utilized for measuring the refractive index of the measured substance. The change of the effective refractive index causes a phase displacement of the light travelling through this measuring segment. This phase displacement is measured as a phase difference to a light component not influenced by the measuring substance. This measurement is preferably made interferometrically.
Abstract:
A fuel control device, system using the device and method of making the same are provided, the device comprising a housing having a passage therethrough for interconnecting a fuel source with a main burner, a throttle valve unit disposed in the passage for throttling fuel flow through the passage to the burner, and a selector operatively interconnected to the throttle valve unit to operate the same, the throttle valve unit comprising a pair of members one of which is substantially stationary and the other of which is rotatable relative to the one member, the one member having a face and having an aperture interrupting the face thereof and passing therethrough, the other member having a face disposed in sliding engagement with the face of the one member for controlling the effective opening of the aperture for fuel flow therethrough, the selector being operatively interconnected to the other member to rotate the same relative to the one member and thereby control the flow of fuel through the passage, the other member having an opening interrupting the face thereof and being adapted to overlap the aperture in various positions therewith for controlling fuel flow therethrough, the other member comprising a plug valve member.
Abstract:
The present disclosure relates to an optical wavelength measuring device using an absorption-type optical fiber-based multiple optical fiber filter modules, an optical sensor system having the same, and an optical measurement method. The An optical wavelength measuring device includes a first optical splitter splitting the signal light provided from the optical fiber sensor into first and second split lights, a first optical detection unit detecting the first split light output from the first optical splitter, a polarization controller installed on an optical path of the second split light output from the first optical splitter, and controlling a polarization state of the second split light, a second optical detection unit detecting the second split light which is polarization-controlled by the polarization controller, and a calculation module calculating an optical wavelength of the signal light according to a physical quantity applied to the optical fiber sensor.
Abstract:
An optical signal processor having a monolithic prism supporting one or more channels, and constructed from a first glass block joined to a second glass block at a beam splitter interface. The monolithic prism has thin film beam splitters and filters (such as I and Q filters) either deposited directly on the prism or attached to it. The beam splitter interface, and the thin film beam splitters and filters are arranged relative to each other so that a portion of the return-ranging collimated encoded beam from an external optical sensor is reflected to all the filters. And detectors are connected over the filters to detect particular components of the collimated encoded beam which are passed through the respective filters.
Abstract:
The present invention provides a method and apparatus for monitoring optical signals with an expanded frequency resolution. The invention permits high-resolution measurements of optical signal spectrums while retaining wide bandwidth operation through appropriate control circuitry. An interferometer having a periodic frequency response formed of equally spaced narrow-band peaks is used to sweep the entire signal spectrum. The interferometer frequency response is incrementally tuned in cycles so that each of its frequency response peaks cyclically scans a particular spectral band of the signal spectrum. During each cycle, the interferometer isolates multiple spectrally resolved portions of the optical signal spectrum where each portion originates from a different spectral band. In this way, a high-resolution measurement of the entire signal spectrum can be obtained. The invention may be network protocol independent and can be incorporated into an optical spectrum analyzer or directly into any optical terminal. The invention can be used for signal spectrum monitoring applications including link quality monitoring (LQM) in optical communications networks to monitor various transmission parameters such as such as carrier wavelengths, optical signal-to-noise ratios (SNR), amplified spontaneous emissions (ASE), noise levels, optical non-linearities or other signal baseband information such as data rates and formats.
Abstract:
An integrated optical Mach-Zehnder interferometer has two arms (11, 12) having different geometric path lengths. A first arm 11 includes arcuate segments (113, 114, 115, 116) and linear segments (111, 112) and the second arm 12 includes a mirror image arcuate segment (123, 124, 125, 126) for each arcuate segment of the first arm 11 and the total length of the straight segments (121) of the second arm 12 is less than the total length of the straight segments (111, 112) of the first arm 11. The integrated optical Mach-Zehnder interferometer is used as a demultiplexer with a 2.times.2 coupler at the output and as a multiplexer with a reversed beam path. The phase difference of both arms is directly proportional to the difference of the geometric path lengths.
Abstract:
A wavemeter fabricated using integrated optics technology. A waveguide structure is formed in a substrate, the structure including signal and reference waveguides and means for coupling an optical input signal into both waveguides. Means are provided for varying the optical path length of the signal waveguide with respect to the reference waveguide in response to a control signal. Optical signals passing through the waveguides are coupled to a detection system that produces a feedback signal having a characteristic that is a function of the optical path length difference between the waveguides, and of the wavelength of the optical input signal. A control system receives the feedback signal and produces the control signal such that the feedback signal characteristic is driven towards a predetermined value. The control signal then provides a measure of the wavelength of the optical input signal.
Abstract:
A fuel control device, system using the device and method of making the same are provided, the device comprising a housing having a passage therethrough for interconnecting a fuel source with a main burner, a throttle valve unit disposed in the passage for throttling fuel flow through the passage to the burner, and a selector operatively interconnected to the throttle valve unit to operate the same, the throttle valve unit comprising a pair of members one of which is substantially stationary and the other of which is rotable relative to the one member, the one member having a face and having an aperture interrupting the face thereof and passing therethrough, the other member having a face disposed in sliding engagement with the face of the one member for controlling the efffective opening of the aperture for fuel flow therethrough, the selector being operatively interconnected to the other member to rotate the same relative to the one member and thereby control the flow of fuel through the passage, the other member having an opening interrupting the face thereof and being adapted to overlap the aperture in various positions therewith for controlling fuel flow therethrough, the other member comprising a plug valve member.