Abstract:
An electro-optical single-sideband modulator comprising: an electro-optical substrate; a bimodal optical waveguide structure formed in the substrate to support different optical modes having associated optical frequencies and optical propagation constants and comprising an optical input to receive an input optical carrier signal having an optical frequency, and a pair of optical outputs to output corresponding SSB modulated optical signals, each having an optical frequency spectrum with a single side lobe; and an electrode structure formed on the substrate to receive an input electrical modulating signal having an associated electrical frequency and electrical propagation constant, and to responsively apply an electrical field to the bimodal optical waveguide structure.
Abstract:
An arrangement for the resonant frequency doubling of multimode laser radiation with resonators is provided, including mirrors and an optically nonlinear material. The arrangement ensures a dispersion-free tuning of the length of a passive resonator, and enables the frequency doubling of a multimode laser, which is resonant simultaneously for all modes of the laser radiation, and which is achieved by pairs of mutually oppositely disposed movable elements of an optically transparent material, such as prisms (P1, P2). The prisms are brought into the beam path of the resonator (R), formed from mirrors (M1 to M4) and optically nonlinear material (BBO). The prisms are movable elements (P1, P2) which are connected to adjusting elements such as piezoactuators, so that the optical length of the resonator (R) can be tuned and compensation for dispersion attained.
Abstract:
A thermo-optic wave-guide switch. The switch selectively switches the paths of an optical signal. The thermo-optic wave-guide switch includes a multi-mode wave-guide having an input port, a first output port and a second output port, and a thin film heater formed on the side of the multi-mode wave-guide. When the thin film heater does not provide the multi-mode wave-guide with heat and a signal is received by the input port, the first output port outputs the signal in a cross state according to the self-image theorem, and when the thin film heater provides the multi-mode wave-guide with heat and a signal is received by the input port, the second output port outputs the signal in a bar state.
Abstract:
An electro-holographic light field generator device comprises surface acoustic wave (SAW) optical modulators arranged in different directions. Specifically, some embodiments have SAW modulators arranged in pairs, nose-to-nose with each other, and have output couplers that provide face-fire light emission. These SAW modulators also possibly include SAW sense transducers and/or viscoelastic surface material to reduce crosstalk.
Abstract:
Disclosed herein is an optical modulator (1) coupled to an optical fiber (7) and providing a modulated optical signal based on the input optical signal received from the optical fiber; the optical modulator (1) is provided with an electro-optical substrate (3) and an optical waveguide structure (2) formed in the substrate (3) and having an input branch (6) coupled to the optical fiber (7), an output branch (10) outputting the modulated optical signal, and a first and a second arms (12a, 12b) branching off from the input branch (6) and merging into the output branch (10). In particular, the input branch (6) is configured so as to be at least bimodal, and the optical fiber (7) is so arranged with respect to the input branch (6) to excite a first and at least a second optical propagation mode and to provide the first and second optical propagation modes with respective given amounts of optical power, to compensate for different optical losses of the first and second arms (12a, 12b).
Abstract:
Disclosed herein is an optical modulatqr (1) coupled to an optical fiber (7) and providing a modulated optical signal based on the input optical signal received from the optical fiber; the optical modulator (1) is provided with an electro-optical substrate (3) and an optical waveguide structure (2) formed in the substrate (3) and having an input branch (6) coupled to the optical fiber (7), an output branch (10) outputting the modulated optical signal, and a first and a second arms (12a, 12b) branching off from the input branch (6) and merging into the output branch (10). In particular, the input branch (6) is configured so as to be at least bimodal, and the optical fiber (7) is so arranged with respect to the input branch (6) to excite a first and at least a second optical "propagation mode and to provide the first and second optical propagation modes with respective given amounts of optical power, to compensate for different optical losses of the first and second arms (12a, 12b).
Abstract:
A set−reset flip−flop of all−optical operation. A set light is inputted through a set port. Then, a multimode interference portion in a waveguide oscillates only in a set mode. As a result, a noninverted output Q is produced from a noninverted output port. Even if the input of the set light is turned off, the output state is maintained. When a reset light is inputted through a reset port, the multimode interference portion stops its oscillation in the set mode and causes oscillation in a reset mode. Thus, an inverted output Q−bar is generated from an inverted output port. Even if the reset light input is turned off, the output state is maintained.
Abstract:
The invention concerns a pumped fibre laser comprising essentially a doped fibre (1), Said laser is mainly characterised in that the doped fibre is multimode (1) and it also comprises a spatial mode converting device (3) receiving the beam. Said multimode fibre has a core with diameter greater than 30 micrometers, even greater than 50 micrometers.