43 results about "Nonlinear waveguide" patented technology

A non-linear waveguide comprises a transmission line including a first conductive line and a second conductive line; a first bias voltage supply connected with the transmission line; and one or more pairs of diodes connected between the first conductive line and the second conductive line, the one or more pairs of diodes including: a first diode having an anode connected with the first conductive line and a cathode connected with the second conductive line; a second diode having a cathode connected with the first conductive line and an anode connected with the second conductive line; and a second bias voltage supply connected between the anode of the second diode and the second conductive line.

A handpiece can treat biological tissue using electromagnetic radiation, which can be substantially fluorescent light. The handpiece includes a source of electromagnetic radiation and a nonlinear waveguide. The nonlinear waveguide is adjacent the source, receives electromagnetic radiation from the source, and delivers the electromagnetic radiation to the biological tissue. The handpiece also includes a system for circulating a fluorescent substance through the nonlinear waveguide. The fluorescent substance is capable of modulating at least one property of the electromagnetic radiation.

A super-continuum system including: a fiber laser (110) configured to output a pulse having a center wavelength; a first nonlinear waveguide (120) configured to shift the wavelength of the pulse from the fiber laser; a first fiber amplifier (130) of at least one stage configured to amplify the output from the first nonlinear waveguide; and a second nonlinear waveguide (140) configured to spectrally broaden the output from the first fiber amplifier.

Low phase noise radio frequency (RF) sources generated by voltage controlled oscillators (VCOs) are described. Optical modulators driven by a VCO may be used to generate optical side-bands to cw lasers. The spectral extent of said side-bands can be increased via frequency broadening in highly nonlinear waveguides. Free running mode locked low phase noise comb oscillators can be used as reference oscillators to generate beat signals between those side-bands and individual comb modes at distal spectral regions, thereby creating an error signal used to reduce the phase noise of VCOs and the generation of low phase noise RF signals. VCO phase noise may be reduced by using free-running modelocked comb lasers phase locked to external frequency references, by omitting a reference comb and using a nonlinear interferometer for generating an error signal, or by locking a slave comb to the modulation frequency of an intra-cavity modulator driven by the VCO.

With a wavelength conversion device based on a nonlinear optical effect, when arrayed waveguides including an intended nonlinear waveguide are fabricated, unwanted slab waveguides are inevitably formed. The slab waveguides can cause an erroneous measurement in the selection of a waveguide having desired characteristics from the arrayed waveguides. The erroneous measurement can lead to redoing steps for fabricating the wavelength conversion device and a decrease in the yield and inhibit the evaluation of the characteristics in selection of the waveguide and the subsequent fabrication of the wavelength conversion device from being efficiently performed. A wavelength conversion device according to the present invention includes a plurality of waveguides formed on a substrate, and a plurality of slab waveguides that are arranged substantially in parallel with and spaced apart from the plurality of waveguides, and a guided light attenuator is formed in each of the slab waveguides. The guided light attenuators allow efficient selection of a waveguide having desired optical characteristics from the plurality of waveguides. The light attenuation by the guided light attenuators can be changed in steps for fabricating the wavelength conversion device.

The invention discloses a nonlinear polarization rotation effect based all-optical adding and subtracting device. The all-optical adding and subtracting device comprises a set of input polarization controllers, a set of optical attenuators, a light-combining device, a nonlinear polarization rotation device, a light splitting device, a set of polarization controllers and a set of polarized beam splitters. The device adopts a principle as follows: after data light and non-modulated light are simultaneously injected into a nonlinear optical fiber or a nonlinear waveguide, an optical power change is introduced into a nonlinear relative phase shift, thereby resulting in the rotation of polarization states of optical signals. At the output end of the nonlinear optical fiber or waveguide, the orthogonal polarization states of multiple wavelength signals are simultaneously filtered by the light splitting device and the polarized beam splitters, so that various basic combinational logics are completed, and an all-optical half adder, a half-subtracter, a full adder and a full subtracter are realized. According to the invention, the logic operation of signals is directly completed in an optical domain, so that an electronic bottleneck is broken through, and a Tb / s-magnitude all-optical adding and subtracting operation can be realized, and therefore, the device disclosed by the invention can be applied to the fields of light-speed optical signal processing and light-speed optical switching networks and the like.