Patent application number | Description | Published |
20090097120 | TUNABLE FILTER - A light is incident on a refractive diffraction grating | 04-16-2009 |
20090153984 | OPTICAL FILTER AND TUNABLE FILTER - A light from an optical fiber is incident on a dispersive element via an optical circulator and an optical fiber. The dispersive element disperses the incident light toward directions different depending on wavelength to apply the dispersed lights to a lens. The lens focuses the lights at positions different for each wavelength of the light. The patterning plate has desired reflection characteristics. The lights reflected on the patterning plate are multiplexed by the dispersive element through the identical path to be emitted from an optical fiber via the optical circulator. Desired characteristics can be obtained by arbitrarily changing a pattern with reflection characteristics of the patterning plate. In addition, a characteristic of the optical filter can be changed by moving the patterning plate. | 06-18-2009 |
20110268445 | OPTICALLY VARIABLE FILTER ARRAY APPARATUS - In an optically variable filter array apparatus, WDM-signal light beams of m channels ranging in wavelength from λ | 11-03-2011 |
20110293281 | OPTICALLY VARIABLE FILTER ARRAY APPARATUS - In an optically variable filter array apparatus, WDM-signal light beams of m channels ranging in wavelength from λ | 12-01-2011 |
20120020664 | WAVELENGTH SELECTIVE LIGHT CROSS CONNECT DEVICE - A wavelength selective light cross connect device | 01-26-2012 |
20120120475 | OPTICALLY VARIABLE FILTER APPARATUS AND FILTER CHARACTERISTIC CONTROL METHOD THEREOF - Light from an optical fiber is incident on a frequency dispersion element. The frequency dispersion element disperses the incident light into light beams in different directions according to their frequencies and directs the dispersed light beams to a lens. The lens develops the incident light beams over an xy plane according to their frequencies in a strip-like form. A frequency selective element has pixels arranged in a frequency dispersion direction and brings pixels located at positions corresponding to the frequency to be selected into a reflective state. A light beam selected by the frequency selective element is emitted from an optical fiber through the same path. By changing reflection characteristics of the frequency selective element according to each pixel, optical filter characteristics can be desirably changed so as to achieve change of passband width and frequency shift. | 05-17-2012 |
20120128355 | WAVELENGTH SELECTIVE OPTICAL SWITCH DEVICE - In a wavelength selective optical switch device that disperses a WDM light beam according to their wavelengths. Dispersed light beams is applied to a wavelength selecting element. Incident light beams are separately reflected in different directions according to their wavelengths by use of the multi-level optical phased array. In the optical phased array, even when the number of multi levels is small, by setting the maximum phase shift amount of the phased array to be at least 1.5 π and less than 2.0 π, wavelength dependence is reduced, thereby reducing crosstalk. In this manner, the wavelength dependence, in turn, crosstalk can be reduced. | 05-24-2012 |
20140016079 | WAVELENGTH SELECTIVE OPTICAL SWITCH - A wavelength selective optical switch includes an incidence/emergence unit that includes an input port at which signal light made up of light of numerous wavelengths is incident and an output port at which light signals of selected wavelengths are emergent, a wavelength dispersion element that spatially disperses signal light according to a wavelength of the signal light, and synthesizes reflected light, a condenser element that condenses light dispersed by the wavelength dispersion element on a two-dimensional plane, a space phase modulator arranged so as to receive incident light deployed on an xy plane made up of an x-axis direction deployed according to wavelength and a y-axis direction orthogonal to the x-axis direction, and having numerous pixels arranged in a lattice on the xy plane, and a space phase modulator drive unit. | 01-16-2014 |
20140072257 | WAVELENGTH SELECTIVE OPTICAL SWITCH - A wavelength selective optical switch includes a light input/output unit having a plurality of input/output ports, a polarization plane-independent wavelength dispersion element that splits incident light input from the optical input/output unit into spatially different angles for each wavelength, and synthesizes emergent light from different directions and outputs the light to the optical input/output unit, a condenser element that condenses the light split by the wavelength splitting element, a polarization splitter that splits incident light incident via the condenser element according to a polarization component to result in first and second light beams, aligns a polarization direction by rotating a polarization direction of one of the beams, and synthesizes the incident light by rotating one polarization direction of the emergent light of the same wavelength among the first and second reflected light beams, and a space phase modulation element. | 03-13-2014 |