Abstract:
An optical switch includes a substrate, a ring resonator formed on the substrate, a first waveguide formed on the substrate in optical coupling with the ring resonator, the first waveguide being configured to guide a WDM signal, an optical detector configured to detect an optical signal component in said ring resonator, a temperature regulator driven in response to an output signal of the optical detector, the temperature regulator being configured to change a temperature of the ring resonator, the ring resonator having a resonant wavelength corresponding to a wavelength of an optical signal component that constitutes the WDM signal, the ring resonator, the optical detector and the temperature regulator constituting together a feedback control system that locks the resonant wavelength of the ring resonator to the wavelength of the optical signal component in the WDM signal.
Abstract:
Systems and methods are presented for modulating a beam of radiation, such that the modulated beam exhibits substantially null residual amplitude modulation (RAM). An electro-optical modulator is presented that includes a waveguide, a first region associated with the waveguide and a second region associated with the waveguide. The waveguide is designed to guide a beam of radiation. A first electric potential applied to the first region causes a first modulation to the beam of radiation while a second electric potential applied to the second region causes a second modulation to the beam of radiation. The first modulation combined with the second modulation provides substantially null residual amplitude modulation of the beam of radiation.
Abstract:
Disclosed is an optical delay element that makes use of a line-defect waveguide of a photonic crystal, in which long optical delay time and small group speed dispersion are rendered compatible with each other and in which waveform distortion that might otherwise be produced in processing an ultra-high speed signal is eliminated. Two line-defect waveguides 5 and 11, having different pillar diameters and group velocity dispersions of opposite signs, are interconnected by a line-defect waveguide 8, the pillar diameters of which are gradually varied from one 5 of the line-defect waveguides to the other line-defect waveguide 11, such as to compensate for group speed dispersion as well as to maintain an optical delay effect.
Abstract:
An optical switch includes a substrate, a ring resonator formed on the substrate, a first waveguide formed on the substrate in optical coupling with the ring resonator, the first waveguide being configured to guide a WDM signal, an optical detector configured to detect an optical signal component in said ring resonator, a temperature regulator driven in response to an output signal of the optical detector, the temperature regulator being configured to change a temperature of the ring resonator, the ring resonator having a resonant wavelength corresponding to a wavelength of an optical signal component that constitutes the WDM signal, the ring resonator, the optical detector and the temperature regulator constituting together a feedback control system that locks the resonant wavelength of the ring resonator to the wavelength of the optical signal component in the WDM signal.
Abstract:
A liquid crystal display includes a backlight. The backlight includes a plurality of waveguides to selectively direct light. A set of selection elements in combination with the backlight selectively direct light to the front of the display.
Abstract:
A coplanar waveguide includes a substrate, a signal line formed on the substrate, a pair of ground conductors formed on the substrate on mutually opposite sides of the signal line, a signal line insulating film disposed between the signal line and the substrate, and a ground conductor insulating film disposed between the pair of ground conductors and the substrate. No corresponding insulating film is present on the substrate between the signal line and the ground conductors. Even if a silicon substrate is used, the attenuation characteristics of the coplanar waveguide are comparable to the attenuation characteristics of coplanar waveguides formed on compound semiconductor substrates.
Abstract:
Methods of attenuating, delaying the phase, and otherwise controlling an optical signal propagating along a waveguide are provided. According to one method, a variable optical attenuator structure is provided comprising a waveguide core, a cladding, an electrooptic polymer, and a set of control electrodes. The core, the cladding, and the electrooptic polymer are configured such that an increase in the index of refraction of the polymer causes a substantial portion of an optical signal propagating along the waveguide core to couple into a relatively high index region of the electrooptic polymer above the waveguide core, so as to inhibit return of the coupled signal to the waveguide core. Another embodiment of the present invention introduces a phase delay in the coupled optical signal and permits return of the coupled signal to the waveguide core. An additional embodiment contemplates the use of a ridge waveguide structure to enable control of the optical signal. Additional embodiments are disclosed and claimed.
Abstract:
Methods of attenuating, delaying the phase, and otherwise controlling an optical signal propagating along a waveguide are provided. According to one method, a variable optical attenuator structure is provided comprising a waveguide core, a cladding, an electrooptic polymer, and a set of control electrodes. The core, the cladding, and the electrooptic polymer are configured such that an increase in the index of refraction of the polymer causes a substantial portion of an optical signal propagating along the waveguide core to couple into a relatively high index region of the electrooptic polymer above the waveguide core, so as to inhibit return of the coupled signal to the waveguide core. Another embodiment of the present invention introduces a phase delay in the coupled optical signal and permits return of the coupled signal to the waveguide core. An additional embodiment contemplates the use of a ridge waveguide structure to enable control of the optical signal. Additional embodiments are disclosed and claimed.
Abstract:
Generally, an embodiment of the present invention provides an optical input/output (I/O) chip that is fabricated separately and distinctly from an electrical integrated circuit chip having core circuitry thereon. The electronic and optical I/O chips are later electrically connected (e.g., using packing technology) to form a hybrid optical-electronic chip system that utilizes optical I/O components on the optical I/O chip to communicate at least some of the I/O signals into and out of the electrical integrated circuit on the distinct electronic chip.
Abstract:
A tunable optical signal device and method of using the same having at least two filter elements, each of said filter elements being made of a material having an adjustable parameter, wherein the adjustable parameter is maintained at slightly different values for adjacent filter elements.