摘要:
A broadband spectral power generator in a multimode optical fiber utilizes a standard multimode fiber that is coiled. A plate is placed on the coiled fiber and a force is applied to compresses the coiled fiber and thereby increase the interactions between the compressed windings and induce modal mixing and birefringence in the fiber. In addition, the compression causes additional non-linear processes to be excited and occur in the compressed fiber coil to generate more broadband light. This allows for better "mixing" of the spatial beam in the multimode fiber coil and allows for the various modes to overlap. The multimode fiber coil is made of silica, silicate, germinate, phosphate, fluoride, chalcogenide, or telluride. The compressed coiled fiber may be driven by a laser providing more than one wavelength output and this greatly increases the amount of nonlinear mixing in the fiber for a greatly enhanced spectral coverage.
摘要:
Provided is a wavelength converter capable of generating a converted signal having a wavelength different from the wavelength of input light. The wavelength converter of the present invention comprises: (1) a pump light source for outputting pump light; (2) a light multiplexing part for multiplexing the input light and the pump light and outputting thus multiplexed light; (3) and a plurality of optical fibers connected together in cascade, allowing the passage of the input light and the pump light thus multiplexed and output thereinto by the light multiplexing part, having mutually different zero dispersion wavelengths, and being capable of generating a converted signal by the nonlinear optical phenomenon occurring during the passage of the input light and the pump light. The wavelength conversion efficiency of the sidebands is less than -20 dB relative to the maximum value of the wavelength conversion efficiency in the entirety of the plurality of optical fibers.
摘要:
A process of poling a silica material such as an optical fiber whereby electro-optic non-linearities are induced so that the material can function as a phase modulator and switch in optical communications applications. The poling is effected at an elevated temperature on the order of 450 DEG C or higher, using an electric field on the order of 800 V/ mu m or higher for a period of time in the range of one minute to several tens of minutes.
摘要:
A non-linear optical material containing at least a compound represented by general formula (I) (wherein R1, R2, R3 and R4 each represents an organic substituent, provided that at least one of R1, R2, R3 and R4 is an electron-attracting group) is disclosed.
摘要:
Die Erfindung betrifft eine Vorrichtung zur Erzeugung abstimmbarer Lichtimpulse im sichtbaren Spektralbereich, mit einem Lasersystem (LS), das Femtosekunden-Lichtimpulse im infraroten Spektralbereich emittiert, und mit einem optischen Frequenzkonverter (FC) zur Konversion der Wellenlänge der Lichtimpulse in den sichtbaren Spektralbereich. Zur Bereitstellung einer derartigen Vorrichtung, die als Lichtquelle für die zeitaufgelöste Fluoreszenzspektroskopie einsetzbar ist, schlägt die Erfindung vor, dass die Wellenlänge der von dem Lasersystem emittierten Lichtimpulse abstimmbar ist und dass ein optischer Strecker vorgesehen ist, mittels welchem die Impulsdauer der frequenzkonvertierten Lichtimpulse auf mindestens 1 ps vergrösserbar ist.
摘要:
The present invention provides a method and an apparatus for poling optical waveguides of arbitrary length, the apparatus including a block of insulating material (24) with first and second electrode holes (28, 30) for respective first and second electrodes (42a, 42b) so as to be located about a poling site within the block (24), first and second electrodes (42a, 42b) located at least partially within the first and second electrode holes (28, 30), and a waveguide hole (32) passing through the block (24) and including said poling site, wherein any desired length of the optical waveguide can be poled progressively by preogressively locating respective portions of the optical waveguide at the poling site while maintaining a voltage difference across the electrodes (42a, 42b).
摘要:
A non-linear optical fiber capable of producing non-linear optical phenomena at high efficiency, an optical fiber coil composed of coiled non-linear optical fibers, and a wavelength converter provided with the non-linear optical fiber. The non-linear optical fiber in particular has characteristics for input light of a predetermined wavelength, which include a modal field diameter of 5 mu m or less, a polarization dispersion of 1 ps/km or a constant plane of polarization, a zero-dispersion wavelength of 1.5 mu m to 1.6 mu m, a cutoff wavelength of 1.4 mu m to 1.7 mu m for a fiber length of 2 m, a transmission loss of 3 dB/km or less, and a non-linear coefficient of 10/W/km or higher. With this configuration the non-linear optical fiber can generate highly efficiently desired converted light by the non-linear phenomena.
摘要翻译:能够以高效率产生非线性光学现象的非线性光纤,由线圈非线性光纤构成的光纤线圈和设置有非线性光纤的波长转换器。 非线性光纤特别地具有预定波长的输入光的特性,其包括5μm或更小的模场直径,1ps / km 1/2的偏振色散或恒定的偏振平面 ,1.5μm至1.6μm的零色散波长,光纤长度为2μm的截止波长为1.4μm至1.7μm,传输损耗为3dB / km或更小,非线性 系数在10 / W / km以上。 通过这种配置,非线性光纤可以通过非线性现象产生高效率的所需转换光。
摘要:
La fibre optique microstructurée comporte un cœur (4) entouré par une gaine (1); la gaine (1) comprend un matériau de base d'indice de réfraction (ni) et une pluralité d'inclusions d'au moins deux types différents, un premier type d'inclusions (2) d'indice de réfraction n2 (n2 >n1), et un deuxième type d'inclusions (3) d'indice de réfraction n3 (n3 RTι , et un guidage d'un mode fondamental de la lumière dans la première bande interdite photonique (BG1), centré sur une longueur d'onde λ BG1 qui est différente de celle λ Rτι du mode fondamental guidé par réflexion totale interne (RTI).
摘要:
A method of thermally poling a silica based waveguide (12) comprises exposing a region of the waveguide (12) to an electric field (for example, via capillary electrodes (22, 24) inserted into holes in the waveguide); directing a laser beam (18) into the region exposed to the electric field to effect localised heating of the region via direct absorption; and scanning the laser beam (18) over the region at a rate selected to avoid heating of the region above the glass transition temperature. Reversing the electric field while scanning the laser beam (18) allows the formation of periodic poled gratings. The waveguide (12) can comprise an optical fibre.