Abstract: The optical fiber sensor system includes a light source unit including a light source and a polarization controller, a modulation unit having an optical path and a coil and configured to modulate light passing though the optical path according to stress applied to the coil, an optical coupler configured to branch the measured light into clockwise light and counterclockwise light, and output interference light, a polarization separator configured to separate the interference light into a first component and a second component having polarization states orthogonal to each other, and a detection unit having a first light detector and configured to detect stress by converting the first component into a first electrical signal. The polarization controller controls a polarization state of light output from the light source so that the first electrical signal is proportional to the stress.

Abstract: A wavelength selective switch 1A includes a light input/output unit 10, a dispersive element 20, and a light deflection element 30 disposed side by side on a predetermined axis C. The light input/output unit 10 has a first portion 10a in which light enters and exits a light input/output port 11 by an optical axis inclined with respect to the predetermined axis C, and a second portion 10b in which light enters and exits a light input/output port 12 by an optical axis inclined with respect to the predetermined axis C. A light entry/exit angle of the light input/output port 11 with the predetermined axis C as a reference and a light entry/exit angle of the light input/output port 12 with the predetermined axis C as a reference differ from each other.

Abstract: A wavelength selective switch includes a wavelength dispersive element that divides a beam input from an input port, a beam director that deflects a wavelength component, and a free space optical system that optically couple a input/output unit, the wavelength dispersive element, and the beam director. The free space optical system converts a shape of the beam such that a size extending in a second plane is relatively smaller than a size extending in a first plane, and to have a long axis and a short axis in a third plane. The long axis is inclined with respect to the first direction. The beam director includes a beam directing region in which a plurality of beam directing elements are arranged. The beam directing region deflects the respective wavelength components toward the predetermined output port. The beam directing region is provided to correspond to the shape of the beam.

Abstract: A wavelength selective switch 1A includes a first port 11 and second ports 12a to 12d; a wavelength dispersive element 15; and a phase modulation element 17. Wavelength components L21 to L23 deflected by the phase modulation element 17 are respectively incident to the desired second ports 12b to 12d. A first control voltage pattern is supplied to the phase modulation element 17 in such a way that when the optical path of a wavelength component is switched from one to another of the second ports, the amount of phase modulation of a pre-switching phase modulation pattern is reduced while the period of a diffraction grating is maintained, and thereafter, a second control voltage pattern is supplied to the phase modulation element 17 so as to present a post-switching phase modulation pattern.

Abstract: In an optical path control device, a light input section 1 forms optical apertures 61a, 61b to output dispersed beams L2a, L2b, respectively, so that propagation angles of the dispersed beams L2a, L2b in an YZ plane are different from each other, at a focal position on the dispersive element 5 side of an optical power element 6. The dispersed beams L2a, L2b propagating at their respective angles different from each other in the YZ plane are individually coupled to optical deflectors 7a, 7b, respectively.

Abstract: An light input/output unit has at least three first ports, including a first input port for inputting light and a first output port for outputting light; at least three second ports, including a second input port for inputting light and a second output port for outputting light; and an alignment port for inputting and outputting alignment light. An optical axis of the input/output light of the first port and an optical axis of the input/output light of the second port differ from each other. The dispersive element changes the optical axes of input/output lights of the first and second ports by an angle corresponding to a wavelength. The light deflective element has a first part for directing the light from the first input port to the first output port and a second part for directing the light from the second input port to the second output port.

Abstract: An interferometric optical fiber sensor system comprises a light source, a first coupler optically connected to the light source, a first optical path for inputting measurement light, a second optical path for inputting reference light, a second coupler for combining the first and second optical paths together, a photodetector for measuring modulation of the measurement light and the reference light, and a coil for modulating with a stress exerted thereon the measurement light and the reference light. The first optical path has an optical length equal to that of the second optical path. The first optical path has a first delay line, while the second optical path has a second delay line. The coil is disposed between the first delay line and the second coupler and between the second delay line and the first coupler.

Abstract: A signal processing element that modulates beam from an input/output unit, an optical substrate mounting the signal processing element, and a temperature controller that controls a temperature of the signal processing element are included, the signal processing element includes an incidence surface on which the beam is incident, a modulation layer that modulates the beam from the incidence surface, and a driving substrate for controlling the modulation of the beam arranged on the opposite side of the incidence surface, the temperature controller is arranged opposite the driving substrate, the incidence surface is connected to the optical substrate by a first connection portion, the driving substrate is connected to the temperature controller by a second connection portion, and an area on the temperature controller side of the second connection portion is more greatly deformed than that on the driving substrate side according to change in volume of the temperature controller.

Abstract: An optical device comprises an input/output port including an input port and an output port arranged in a first direction, a dispersive element dispersing an optical signal input from the input port in accordance with the wavelength in a second direction perpendicular to the first direction so as to generate a plurality of wavelength components, a light deflection element including pixels arranged in the first direction configured to present a phase modulation pattern for independently phase-modulating each of the wavelength components, and the phase modulation pattern including a first pattern for deflecting each of the wavelength components toward the output port, and a second pattern different from the first pattern, and an anamorphic converter configuring a beam spot of the wavelength components incident on the light deflection element to an elliptical shape relatively larger in the first direction than in the second direction.

Abstract: A wavelength selective switch includes a light input and output part in which light input/output ports are arranged in a predetermined direction, the light input/output ports including a first port for inputting light, a second port for outputting the light, and at least one third port for inputting or outputting the light, a wavelength dispersive element optically coupled to the light input and output part, and a phase modulation element which includes a plurality of pixels performing phase modulation and diffractively deflects an optical path of the light arriving from the first port via the wavelength dispersive element by presenting a diffraction-grating-shaped phase modulation pattern, and the light input/output ports are arranged so that a 1st order light of the light is incident on the second port, and the first port and the third port are spaced from an optical axis of a ?1st order light of the light.

Abstract: In an optical path control device 100, dispersed lights L2 in a flat shape in which a spot size in an arrangement direction (y-axis direction) of light deflection component elements to deflect light is relatively larger enter a light deflection element 7 and thus, the dispersed lights L2 can be deflected precisely and efficiently. Particularly in the optical path control device 100, the spot size thereof is converted by an anamorphic converter 2 arranged prior to the dispersive element 5. Thus, the degree of flexibility of optical design can be increased such as being able to arrange various optical components subsequent to the dispersive element 5.

Abstract: A signal processing element that modulates beam from an input/output unit, an optical substrate mounting the signal processing element, and a temperature controller that controls a temperature of the signal processing element are included, the signal processing element includes an incidence surface on which the beam is incident, a modulation layer that modulates the beam from the incidence surface, and a driving substrate for controlling the modulation of the beam arranged on the opposite side of the incidence surface, the temperature controller is arranged opposite the driving substrate, the incidence surface is connected to the optical substrate by a first connection portion, the driving substrate is connected to the temperature controller by a second connection portion, and an area on the temperature controller side of the second connection portion is more greatly deformed than that on the driving substrate side according to change in volume of the temperature controller.

Abstract: A wavelength selective switch includes a wavelength dispersive element that divides a beam input from an input port, a beam director that deflects a wavelength component, and a free space optical system that optically couple a input/output unit, the wavelength dispersive element, and the beam director. The free space optical system converts a shape of the beam such that a size extending in a second plane is relatively smaller than a size extending in a first plane, and to have a long axis and a short axis in a third plane. The long axis is inclined with respect to the first direction. The beam director includes a beam directing region in which a plurality of beam directing elements are arranged. The beam directing region deflects the respective wavelength components toward the predetermined output port. The beam directing region is provided to correspond to the shape of the beam.

Abstract: An light input/output unit has at least three first ports, including a first input port for inputting light and a first output port for outputting light; at least three second ports, including a second input port for inputting light and a second output port for outputting light; and an alignment port for inputting and outputting alignment light. An optical axis of the input/output light of the first port and an optical axis of the input/output light of the second port differ from each other. The dispersive element changes the optical axes of input/output lights of the first and second ports by an angle corresponding to a wavelength. The light deflective element has a first part for directing the light from the first input port to the first output port and a second part for directing the light from the second input port to the second output port.

Abstract: A wavelength selective switch includes a light input and output part in which light input/output ports are arranged in a predetermined direction, the light input/output ports including a first port for inputting light, a second port for outputting the light, and at least one third port for inputting or outputting the light, a wavelength dispersive element optically coupled to the light input and output part, and a phase modulation element which includes a plurality of pixels performing phase modulation and diffractively deflects an optical path of the light arriving from the first port via the wavelength dispersive element by presenting a diffraction-grating-shaped phase modulation pattern, and the light input/output ports are arranged so that a 1st order light of the light is incident on the second port, and the first port and the third port are spaced from an optical axis of a ?1st order light of the light.