摘要:
The optical switching device includes an optical layer (5) provided with at least one optical waveguide (11) having an entrance (13) and an outlet (15) and at least one other optical waveguide (21) provided in the optical layer (5) with another outlet (23); a piezoelectric layer (7) arranged on the optical layer (5); electrodes (9) for producing an acoustic wave provided on the piezoelectric layer (7); and a device for performing a Bragg light deflection with optical frequency shift by one of activating and deactivating the electrodes to optically couple the entrance (13) of the at least one optical waveguide (11) with one or the other of the outlets (15, 23). The invention also relates to an optical by-pass circuit which is a combination of two optical switching devices.
摘要:
A method and a system for detecting the spatial movement state of moving objects, e.g., vehicles. Due to a, for example, non-cartesian arrangement of four rotational rate sensors and/or acceleration sensors, it is also possible to obtain a redundant signal in addition to the desired useful signal indicating the spatial movement state, e.g., the rotational movement and/or acceleration in space; if this redundant signal is large enough in comparison with the rotational rate actually applied, it may be used for detection of the size of the error and the defective sensor. The four sensors are mounted, for example, on a sensor platform forming a three-sided truncated pyramid so that all possible three-way combinations of sensors are mutually linearly independent. The accuracy about the vertical axis is defined by the angle of inclination of the side faces of the truncated pyramid.
摘要:
The thermooptic modulator includes a wave guide (1) having a switching section (4), a refracting section (5) bordering the switching section (4) and extending transversely to a signal propagation direction (14) in the wave guide and a first heating element (8) extending on the refracting section (5) along a boundary (6) between the wave guide (1) and the refracting section (5). In order to improve signal suppression when the modulator is switched to an impermable state, a second heating element (9) is provided extending on the wave guide (1) along the boundary (6).
摘要:
A component is provided for an impedance change in a coplanar waveguide which includes two grounding conductors and a signal line lying between the grounding conductors, as well as a conducting connecting element, which has a covering surface for the two grounding conductors and the signal line, and is electrically insulated, so that in each case a capacitor is formed. The connecting element and the lines are situated and arranged so that the respective capacitor between the grounding conductors and the connecting element has an invariable capacitance, but the capacitor between the connecting element and the signal line has a variable capacitance. A structure is also provided in which in an exactly opposite way, the respective capacitor between the grounding conductors and the connecting element has a variable capacitance, but the capacitor between the connecting element and the signal line has an invariable capacitance. Furthermore, a method for producing such a component is also provided.
摘要:
An optical sensor for detecting wetting of a surface (11), In particular of a vehicle window, has at least one transmitter (13) and at least one receiver (15) for electromagnetic waves, the surface being located in a sensor region (16) between the at least one transmitter (13) and the at least one receiver (15). The development of wetting on the sensor region (16) of the surface (11) causes a signal change. The optical sensor has a light-carrying element (18), in which the electromagnetic waves are guided bidirectionally into the sensor region (16) and out of the sensor region (16), and a retroreflector (10) is disposed in the sensor region (16) in such a way that it returns the electromagnetic waves, reflected before the surface (11), back to the surface (11) and from there to the light-carrying element (18).
摘要:
A method is proposed for producing three-dimensional structures, especially microlenses, in a substrate using an etching process, at least one original shape having a known original surface shape being present initially on the substrate in a plurality of places. The etching process has at least one first etching removal rate a1 and a second etching removal rate a2 which are material-dependent, and of which at least one is changeable as a function of time. The original shape is converted to a target shape by the etching process, the original surface shape of the original shape and the target surface shape of the target shape to be reached being known before the beginning of the etching process. In order to achieve the target surface shape, at least one of the etching rates a2 or a1 is set by a change of at least one etching parameter calculated before the beginning of the etching process as a function of the etching time.
摘要:
A measurement bridge circuit includes a first branch and a second branch. The first branch contains a first resistor which is sensitive to measured variables and an invariable resistor connected in series. A first tap point is located between the first resistor and the invariable resistor. The second branch contains a second resistor which is sensitive to measured variables and a variable resistor arrangement connected in series. The variable resistor arrangement includes a first component having an invariable electrical resistance value and a second component having a variable electrical resistance value. The second component is connected in parallel with the first component in order to vary a total electrical resistance value for the variable resistor arrangement. A second tap point is located between the second resistor and the variable resistor arrangement.
摘要:
A measurement bridge circuit includes a first branch and a second branch. The first branch contains a first resistor which is sensitive to measured variables and an invariable resistor connected in series. A first tap point is located between the first resistor and the invariable resistor. The second branch contains a second resistor which is sensitive to measured variables and a variable resistor arrangement connected in series. The variable resistor arrangement includes a first component having an invariable electrical resistance value and a second component having a variable electrical resistance value. The second component is connected in parallel with the first component in order to vary a total electrical resistance value for the variable resistor arrangement. A second tap point is located between the second resistor and the variable resistor arrangement.
摘要:
The optical signal transmission system includes one or more optical wave guide switches (11 to 15) for switching between transmission paths for transmission of light signals and an optical level adjusting device (16 to 24) connected with the one or more optical wave guide switches in at least one of the transmission paths. The optical level adjusting device (16 to 24) controls its own light transmittance with a thermooptic device (22,24) and the one or more optical wave guide switches (11 to 15) switch between transmission paths by a similar thermooptic device (14,15). The one or more optical wave guide switches and the optical level adjusting device are arranged in an integrated thermooptic circuit in a common substrate.
摘要:
In the case of the above devices, exact adjustment is very important; however, the devices ought to be very compact. It is not sufficient to utilize the silicon etching technique for the precision. The optical transmitting element (LD) is situated on a first carrier (T1), the optical receiving element (PD) and the transmission fiber (Fa) are situated on a third carrier. Provided in between them is a second carrier (T2) which is transparent to the wavelength of the light emitted by the transmitting element (LD). The carriers are structured by means of anisotropic etching in order to make possible the accommodation of the individual components. In addition, the carriers lie flat on one another and can thus be adjusted. A monitor diode (MD) is provided. Application of the arrangement in all transmission systems having optical waveguides.