Abstract:
PROBLEM TO BE SOLVED: To provide a set-reset flip-flop which operates all-optically. SOLUTION: Set light is inputted from a setting port 321. Then a multimode interference part 31 of a waveguide 30 oscillates only in set mode. Consequently, an uninverted output Q can be obtained from an uninverted output port 331. This state lasts even after the set light input is ceased. Then reset light is inputted from a resetting port 322. Then the multimode interference part 31 stops oscillating in the set mode and oscillates in reset mode. Consequently, an inverted output Q can be obtained from an inverted output port 332. This state lasts even after the reset light input is ceased. COPYRIGHT: (C)2003,JPO
Abstract:
A supercontinuum optical pulse source provides a combined supercontinuum. The supercontinuum optical pulse source comprises one or more seed pulse sources (13), and first and second optical amplifiers (7) arranged along first and second respective optical paths. The first and second optical amplifiers are configured to amplify one or more optical signals generated by said one or more seed pulse sources. The supercontinuum optical pulse source further comprises a first microstructured light-guiding member (9) arranged along the first optical path and configured to generate supercontinuum light responsive to an optical signal propagating along said first optical path, and a second microstructured light-guiding member (9) arranged along the second optical path and configured to generate supercontinuum light responsive to an optical signal propagating along said second optical path. The supercontinuum optical pulse source further comprises a supercontinuum-combining member (5) to combine supercontinuum generated in at least the first and second microstructured light-guiding members to form a combined supercontinuum. The supercontinuum-combining member comprises an output fibre, wherein the output fibre comprises a silica-based multimode optical fibre supporting a plurality of spatial modes at one or more wavelengths of the combined supercontinuum.
Abstract:
A light source (400), having a quasi-incoherent broadband pump source configured to produce a longitudinally and transversally multi-mode pump beam (235) is disclosed. The light source may include a means (220) for narrowing the linewidth of the pump beam. An optical parametric oscillator with an optical cavity (351,352) contains a first crystal (370) configured to receive light from the pump source and produce a first output light beam and a second output light beam. A second crystal (470) in the cavity is configured to receive the first output light beam and the second output light beam and produce a third output light beam (465) having a frequency twice the first or second output light beam.
Abstract:
The present invention provides a polarizer and a polarization modulation system. The polarizer includes at least one MMI multi-mode waveguide, where one side of each MMI multi-mode waveguide is connected to an input waveguide, and the other side is connected to an output waveguide; an end portion of the side, on which the output waveguide is located, of the MMI multi-mode waveguide is provided with an adjustable portion, and the adjustable portion is connected to the output waveguide; and the polarizer further includes a controller connected to the adjustable portion, where the controller is configured to perform control to change a material property of the adjustable portion, so that the output waveguide outputs optical signals in different polarization states. The present invention implements adjustable polarization, and the structure is simple.
Abstract:
Embodiments of the present invention generally relate to optical mode conversion by nonlinear effects. More specifically, embodiments of the present invention relate to nonlinear mode conversion utilizing intermodal four-wave mixing to convert light between modes having different wavelengths for complex applications. In one embodiment of the present invention, a fiber comprises an input end for receiving light in a first mode at a first wavelength, and an output end for outputting light in a desired second mode at a desired second wavelength, wherein the first wavelength and the second wavelength are not the same. In many embodiments, the fiber comprises a higher-order mode fiber.
Abstract:
A planar core and a cladding disposed on opposite sides of thereof. In the best mode, the rotator includes a very low Numerical Aperture (NA) planar waveguide. The cladding is birefringent and the refractive index and birefringence thereof are optimized to provide equal mode propagation velocities for both TE and TM modes for at least one transverse mode. The refractive index and birefringence of the cladding are optimized to provide equal mode propagation velocities for both TE and TM modes for a wide range of transverse modes.