| Patent Number |
Title Of Patent |
Date Issued |
| 7155086 |
Optical signal processing device using optical gate |
December 26, 2006 |
| In the disclosed optical signal processing device, the digital-to-analog conversion of the input optical signals is realized in an optical region, without converting the input optical signals into electric signals for the purpose of signal processing, by splitting input optical signals i |
| 7020398 |
Dispersion slope equalizer |
March 28, 2006 |
| The object of the present invention is to provide a compact dispersion slope equalizer by which it is possible to simultaneously recover distorted waveforms of WDM signals by dispersion slope of DSF or NZ-DSF at 1.55 .mu.m band, and to compensate for the dispersion of various fiber t |
| 6954562 |
Matrix switch of optical waveguide type and method for manufacturing the same |
October 11, 2005 |
| A matrix switch of an optical waveguide type which has low transmission loss variations and includes uniform grooves with a deep vertical cross section is provided. A switching part for selecting between a light path extending from an input port of a first set of optical waveguides 11.su |
| 6912362 |
Dispersion slope equalizer |
June 28, 2005 |
| The object of the present invention is to provide a compact dispersion slope equalizer by which it is possible to simultaneously recover distorted waveforms of WDM signals by dispersion slope of DSF or NZ-DSF at 1.55 .mu.m band, and to compensate for the dispersion of various fiber t |
| 6898345 |
Optical multiplexer and method for its production |
May 24, 2005 |
| An optical multiplexer is equipped with at least one input channel optical waveguide provided on an optical waveguide substrate, a first slab optical waveguide, a channel optical waveguide array formed from a plurality of optical waveguides having a prescribed waveguide length, a second |
| 6788865 |
Polarization maintaining optical fiber with improved polarization maintaining property |
September 7, 2004 |
| A polarization maintaining optical fiber is formed by using a core in a cross sectional shape having different diameters along two orthogonal axes defined on a plane perpendicular to an optical axis, or a photonic crystal structure cladding having a diffraction grating with lattice inter |
| 6724957 |
Optical filter |
April 20, 2004 |
| It is an object of the present invention to provide an optical filter which allows parameters to be easily adjusted, which allows birefringence and temperature dependence to be easily compensated for, and which is essentially free from dispersion. The optical filter includes an optical |
| 6711313 |
CDMA encoder-decoder, CDMA communication system, WDM-CDMA communication system |
March 23, 2004 |
| An optical CDMA encoder-decoder is constructed by combining arrayed-waveguide gratings, matrix optical switches, and delay lines, otherwise by combining arrayed-waveguide grating and variable delay lines, thus providing an encoding process that a wavelength change with respect to tim |
| 6456760 |
Optical signal processing apparatus and optical signal processing method |
September 24, 2002 |
| An optical signal processing apparatus includes a first optical waveguide and a first slab waveguide configured to equally distribute an output light of the first optical waveguide. A first arrayed waveguide includes an aggregate of optical waveguides changing in optical length by a |
| 6404966 |
Optical fiber |
June 11, 2002 |
| An optical fiber including a core having an area of about several times an optical wavelength and composed of a hollow hole, and a cladding having a diffraction grating which is arranged at least in a peripheral area adjacent to the core and has a grating period equal to 1/2 the optical |
| 6304687 |
Optical waveguide circuit, its manufacturing method and optical waveguide module having the opti |
October 16, 2001 |
| In a light waveguide circuit including a plurality of waveguides having different length, a material (10) having a temperature coefficient of a refractive index including a symbol different from that of a temperature coefficient of an effective refractive index of the waveguide (4) is |
| 6278813 |
Wavelength division multi/demultiplexer |
August 21, 2001 |
| A wavelength division multi/demultiplexer multi/demultiplexes incident light to emit demultiplexed lights from each of a plurality of light output ends and includes a first wavelength division multi/demultiplexing circuit having at least one light input end and a plurality of light o |
| 6122419 |
Optical signal processing apparatus and optical signal processing method |
September 19, 2000 |
| The present invention relates to an optical signal processing apparatus and optical signal processing method which enable generation, waveform shaping, waveform measurement, waveform recording, correlation processing, and the like of optical pulses of 1-10 ps. A basic construction of the |
| 5943452 |
Arrayed-waveguide grating |
August 24, 1999 |
| An arrayed waveguide grating including an input waveguide or input waveguides, an input side slab waveguide lens, arrayed waveguides, an output side slab waveguide lens, and an output waveguide or output waveguides, wherein an optical length of the arrayed waveguides monotonically in |
| 5546483 |
Integrated optical waveguide circuit and optical branch line test system using the same |
August 13, 1996 |
| An integrated optical waveguide circuit includes a substrate; an optical wavelength multiplexer and an optical power splitter formed on a same surface of the substrate. The optical wavelength multiplexer is composed of a first slab optical waveguide, a second slab optical waveguide, a |
| 4781424 |
Single mode channel optical waveguide with a stress-induced birefringence control region |
November 1, 1988 |
| In a single mode optical waveguide having a substrate, a cladding layer formed on the substrate, a core portion embedded in the cladding layer, and an elongated member for applying a stress to the core portion or a stress relief groove for relieving a stress from the core portion in the |
| 4525027 |
Single mode optical fibers |
June 25, 1985 |
| In a single mode optical fiber comprising a core made of glass and a cladding surrounding the core and made of glass, when a difference .DELTA. between refractive indices n.sub.1 and n.sub.2 of the core and cladding is expressed by (n.sub.1 -n.sub.2)/(n.sub.1).times.100%, the refractive |
| 4480897 |
Single-polarization single-mode optical fiber |
November 6, 1984 |
| A single-polarization single mode optical fiber of the type comprising an elliptical core, a pair of stress applying parts on both sides of the minor radius of the elliptical core for applying asymmetrical stress thereto and a clad embedding therein the core and the stress applying p |
| 4372647 |
Single mode optical fibers |
February 8, 1983 |
| In a single mode optical fiber of the type comprising a core, a cladding surrounding the core and an intermediate layer, the refractive indices n1, n2 and n3 respectively of the core, the cladding and the intermediate layer are selected such that the following relations are satisfiedwher |
