| Patent Number |
Title Of Patent |
Date Issued |
| RE38086 |
Dispersion compensating fiber and optical transmission system including the same |
April 22, 2003 |
| The present invention relates to a dispersion compensating fiber for improving a transmission system with it in total chromatic dispersion and dispersion slope in the 1.55 .mu.m wavelength band. The dispersion compensating fiber according to the present invention is characterized by |
| 7580183 |
Light generator, optical amplifier, and optical communication system |
August 25, 2009 |
| In an optical amplifier according to the present invention, a change signal from a change signal source is fed into a light source or a drive circuit. The wavelength of light outputted from the light source is changed based on the change signal. The wavelength-changed output light fr |
| 7484387 |
Method of making a microstructured optical fiber |
February 3, 2009 |
| An optical fiber has a section of the first kind having a chromatic dispersion not less than a given positive value x and a negative chromatic dispersion slope at a given wavelength and a section of the second kind has a chromatic dispersion not more than -x and a positive chromatic |
| 7330302 |
Optical transmission system |
February 12, 2008 |
| This invention provides an optical transmission system which allows to perform high-quality transmission of each of a plurality of signal channels multiplexed. In the optical transmission system, signal light in which a plurality of signal channels with an optical frequency spacing of |
| 7153034 |
Method of constructing an optical transmission line and an optical transmission line |
December 26, 2006 |
| The present invention discloses an optical transmission line constructing method comprising the steps of connecting a plurality of optical fibers differing from each other in terms of a transmission characteristic; making inspection light incident on an entrance end of the connected |
| 7085040 |
Optical transmission line, method of making optical transmission line, and optical transmission |
August 1, 2006 |
| The present invention relates to an optical transmission line enabling Raman amplification of an optical signal when pumping light is supplied thereto, a method of making this optical transmission line, and an optical transmission system using this optical transmission line. This opt |
| 6993218 |
Optical switch and optical switch array |
January 31, 2006 |
| An optical switch according to this invention has a planar waveguide in which an optical path is formed. A trench is formed in the upper surface of this planar waveguide. A cantilevered movable member is mounted on the planar waveguide. A comb is formed in the end portion of this movable |
| 6952309 |
Optical amplifier and optical amplification method |
October 4, 2005 |
| A optical filter has a loss spectrum whose gradient dL/d.lambda. of a loss L (dB) with respect to the wavelength .lambda. (nm) is variable in the wavelength band of multiplexed signal light. A control circuit detects each power of signal light components demultiplexed by an optical coupl |
| 6907181 |
Variable optical attenuator |
June 14, 2005 |
| A small optical device which has low power consumption and which is excellent for integration, and which has a variable optical attenuation function which features proper polarization dependence over the entire wide variable optical attenuation range is provided. In the optical devic |
| 6907171 |
Optical fiber composite and optical fiber cable and production method thereof |
June 14, 2005 |
| An optical fiber composite that can easily have a desired mean transmission property as a whole even after a length of optical fiber is cut off from one end or both ends, a cable comprising the composites, and methods for producing the composite and cable. An optical fiber composite 10 i |
| 6892003 |
Variable dispersion compensator and optical transmission system |
May 10, 2005 |
| An optical signal, which is to become the subject of dispersion compensation, is split by optical combining/splitting unit 2, and each frequency component of the optical signal that is split is reflected by the corresponding reflective mirror 30 included in reflective mirror group 3 |
| 6859598 |
Microstructured optical fiber |
February 22, 2005 |
| In an optical fiber including a core region and cladding regions of not less than three layers which surrounds the core region in order, each of said cladding regions has a mean refractive index different from those of the adjacents regions,at least one of the cladding regions has a lowe |
| 6819829 |
Optical communication system |
November 16, 2004 |
| The present invention relates to an optical communication system having a flat gain spectrum and an excellent pumping efficiency in a signal wavelength band, and comprising a structure which is realizable/operable at a low cost. This optical communication system comprises an optical |
| 6819477 |
Raman amplifier module and optical transmission system using the same |
November 16, 2004 |
| An optical transmission path in a Raman gain module (1) for transmitting signal light input from an input terminal (1a) and Raman-amplifying the signal light by pumping light supplied from pumping light source units (21, 22) is formed by connecting in series two Raman amplification optic |
| 6806999 |
Raman amplification pumping module, Raman amplifier, and optical communication system |
October 19, 2004 |
| The present invention provides a Raman amplification pumping module and others with a structure for effectively suppressing degradation of quality of signal light even with a breakdown in either one of a plurality of light sources. The Raman amplification pumping module is provided with |
| 6801683 |
Optical module, light divider/insertor and light transmission device |
October 5, 2004 |
| An optical module has a planar waveguide which is provided with an optical circuit for an optical switch formed by 2.times.2 cross optical waveguides A.sub.1 to D.sub.1 and an optical circuit for an optical variable attenuator formed by 2.times.2 cross optical waveguides A.sub.2 to D |
| 6798564 |
Raman amplification method, raman amplifier, and optical transmission system |
September 28, 2004 |
| The present invention relates to a Raman amplification method realizing Raman amplification of WDM signal light in a wider amplification wavelength band with a simpler configuration, and the like. A Raman amplifier realizing the Raman amplification method comprises a Raman amplificat |
| 6795235 |
Optical transmission line, method of making optical transmission line, and optical transmission |
September 21, 2004 |
| The present invention relates to an optical transmission line enabling Raman amplification of an optical signal when pumping light is supplied thereto, a method of making this optical transmission line, and an optical transmission system using this optical transmission line. This optical |
| 6782185 |
Optical variable attenuator and optical module |
August 24, 2004 |
| An optical variable attenuator has a planar waveguide, which is provided with optical waveguides forming an input optical line A and an output optical line B. A cantilever is disposed at the upper face of the planar waveguide, whereas a movable mirror for reflecting light passing through |
| 6782168 |
Apparatus for and method of monitoring wavelength multiplexed signal light as well as optical tr |
August 24, 2004 |
| The invention provides an apparatus for and method of monitoring wavelength multiplexed signal light, which can obtain monitored data for multi-channel optical signals contained in the wavelength multiplexed signal light, which can avoid a large size and complicated structure and hig |
| 6782155 |
Optical switch |
August 24, 2004 |
| An optical switch that can restrain the occurrence of cross talk is provided. A first waveguide path 11 and a second waveguide path 12 are provided on a waveguide substrate PCL so as to intersect each other at a given angle. A trench T is formed in a straight line in the surface of the |
| 6782151 |
Raman amplifier, optical transmission system and optical fiber |
August 24, 2004 |
| A Raman amplifier having a great Raman amplification gain is disclosed. An optical transmission system 1 is provided with an optical fiber 31 for Raman amplification and an optical multiplexer 41 between a transmitter 10 and a receiver 20 in the order of enumeration, and further provided |
| 6769822 |
Optical fiber composite and optical fiber cable and production method thereof |
August 3, 2004 |
| An optical fiber composite that can easily have a desired mean transmission property as a whole even after a length of optical fiber is cut off from one end or both ends, a cable comprising the composites, and methods for producing the composite and cable. An optical fiber composite 10 i |
| 6766088 |
Optical fiber and method for making the same |
July 20, 2004 |
| An optical fiber has a section of the first kind having a chromatic dispersion not less than a given positive value x and a negative chromatic dispersion slope at a given wavelength and a section of the second kind has a chromatic dispersion not more than -x and a positive chromatic |
| 6763194 |
Optical transmission system and channel assigning method |
July 13, 2004 |
| The present invention relates to an optical transmission system and a channel assigning method with structure to reduce dispersion of power levels among signals dropped at respective signal branchpoints on an optical transmission line out of signals of multiple channels amplified in |
| 6728452 |
Optical cable, method of installing optical cable, and optical transmission line |
April 27, 2004 |
| An optical cable has a reduced slicing loss and superior characteristics in the efficiency of the installation work thereof, and is therefore suitable for installation on land. First and second optical fibers have been connected together by fusion splicing to form joints thereby providin |
| 6718105 |
Optical fiber |
April 6, 2004 |
| In an optical fiber including a core region and a cladding region surrounding said core region in a cross section and having a cross-sectional structure in which a plurality of regions constituted by sub mediums are arranged in main mediums, at least one of refractive indices of the |
| 6704135 |
Operation mode switching apparatus, Raman amplifier and optical transmission system |
March 9, 2004 |
| The present invention relates to an operation mode switching apparatus comprising a structure for making it possible to minimize the waste of energy caused by troubles occurring in optical fiber lines and the like in order to efficiently utilize the energy consumed in an optical tran |
| 6659614 |
Variable dispersion compensator and optical transmission system |
December 9, 2003 |
| An optical signal, which is to become the subject of dispersion compensation, is split by optical combining/splitting unit 2, and each frequency component of the optical signal that is split is reflected by each reflective surface of reflective mirror 40 of reflective means 4 to appl |
| 6643431 |
Optical device and control method thereof |
November 4, 2003 |
| A main optical path and an auxiliary optical path which are formed in a substrate are optically coupled to each other with a plurality of optical couplers, so as to constitute a Mach-Zehnder interferometer. By controlling the temperature regulation of main and auxiliary optical paths |
| 6636677 |
Optical fiber |
October 21, 2003 |
| In an optical fiber composed of a core region and a cladding region surrounding the core region and having a plurality of regions made of sub mediums having refractive indices different from a refractive index of a main medium disposed in a main medium constituting this cladding region, |
| 6633698 |
Optical filter |
October 14, 2003 |
| A main optical path disposed between light input and output ends and an auxiliary optical path disposed so as to correspond to the main optical path are optically coupled to each other with first, second, and third optical couplers. The respective optical path lengths of main and aux |
| 6618532 |
Optical transmission line |
September 9, 2003 |
| An optical transmission line having reduced flunctions in transmission quality is formed with a structure in which first and second waveguides whose transmission characteristics at a predetermined wavelength in a wavelength band in use are set opposite to each other and are arranged |
| 6606440 |
Microstructured optical fiber |
August 12, 2003 |
| In an optical fiber having a core region and a cladding region which surrounds the core region, wherein a plurality of regions made of sub mediums having refractive index different from that of the main medium constituting the cladding region are spaced apart in cross section of the |
| 6574397 |
Optical multiplexer/demultiplexer |
June 3, 2003 |
| The present invention relates to an optical multiplexer/demultiplexer comprising a structure for effectively lowering the crosstalk between adjacent signal channels, thereby realizing excellent wavelength multi/demultiplexing characteristics. The optical multiplexer/demultiplexer is |
| 6571045 |
Microstructured optical fiber |
May 27, 2003 |
| In an optical fiber having a core region and a cladding region, surrounding the core region, comprising a main medium having different refractive indices from the main medium and spaced apart in the main medium, the core region comprises a central core region having a hollow portion disp |
| 6567595 |
Optical fiber line, optical transmission line, method of making optical cable, and method of lay |
May 20, 2003 |
| The present invention relates to an optical fiber line for transmitting a plurality of wavelengths of optical signals in a wavelength division multiplexing transmission system, an optical transmission line, a method of making an optical cable, and a method of laying an optical transmissi |
| 6560381 |
Optical filter |
May 6, 2003 |
| Three Mach-Zehnder interferometers 141 to 143 are connected in a series between an optical input terminal and an optical output terminal in an optical filter. Each interferometer is composed of two optical paths optical coupled at both ends by optical couplers. Only one interferometer |
| 6535677 |
Dispersion-managed optical fiber, method of manufacturing the same, optical communication system |
March 18, 2003 |
| The present invention relates to a dispersion-managed optical fiber which can be manufactured easily and has a structure which enables the easy connection thereof with other optical fiber and the like. The dispersion-managed optical fiber is a silica-based optical fiber ensuring its |
| 6526209 |
Optical fiber having improved optics and structure |
February 25, 2003 |
| In an optical fiber comprising a core region, an inner cladding region, and an outer cladding region which extend along its fiber axis, the average refractive index n.sub.0 of core region, the average refractive index n.sub.1 of inner cladding region, and the average refractive index n.s |
| 6507680 |
Planar lightwave circuit module |
January 14, 2003 |
| A planar lightwave circuit (PLC) of a PLC module is provided with many waveguides including a plurality of input (output) optical waveguide on a substrate. Junction faces between these input (output) optical waveguide and input (output) optical fibers are slant against the optical axis |
| 6498874 |
Optical transmission line |
December 24, 2002 |
| This invention relates to an optical transmission line having a structure that reduces dispersion with respect to signal light in a 1.55-.mu.m band. Each transmission unit includes a dispersion-shifted optical fiber as a transmission medium and a mode removing unit for reducing the optic |
| 6487353 |
Dispersion-shifted optical fiber |
November 26, 2002 |
| The present invention relates to a dispersion-shifted optical fiber suitable for an optical transmission line having an optical fiber amplifier with a wider amplification band. In particular, the dispersion-shifted optical fiber according to the present invention has a zero-dispersio |
| 6483970 |
Fiber optic cable and optical transmission system |
November 19, 2002 |
| A fiber optic cable is provided which can perform a long-distance signal light transmission at high bit rates even if any temporal temperature change or regional temperature difference occurs. Also provided is an optical transmission system in which signal light can be transmitted at |
| 6473548 |
Multiple fiber optical cable and method of manufacturing multiple fiber optical cable |
October 29, 2002 |
| A multiple fiber optical cable includes bundled plural optical fibers. In each of the optical fibers to be bundled in the optical cable, a positive dispersion section having a positive chromatic dispersion in an optical signal wavelength and a negative dispersion section having a negativ |
| 6473546 |
Optical multiplexer/demultiplexer |
October 29, 2002 |
| The present invention relates to an AWG type optical multiplexer/demultiplexer having a small size in a state where cross talk is effectively restrained from increasing between adjacent channels. The optical multiplexer/demultiplexer is designed such that, in a power spectrum indicat |
| 6424760 |
Optical multiplexer/demultiplexer |
July 23, 2002 |
| The present invention relates to an optical multiplexer/demultiplexer which ameliorates the deterioration in crosstalk characteristics between adjacent signal channels in a simpler configuration with a better reproducibility. In this optical multiplexer/demultiplexer, a space filled |
| 6421484 |
Optical fiber transmission line and optical cable including the same |
July 16, 2002 |
| The present invention relates to an optical fiber transmission line comprising a structure for making it possible to maintain a desirable mean transmission characteristic as a whole regardless of the fluctuation in total length caused upon cutting end portions; and an optical cable i |
| 6347174 |
Non-linear optical fiber, optical fiber coil, and wavelength converter |
February 12, 2002 |
| The present invention relates to a nonlinear optical fiber which can generate a nonlinear optical phenomenon with high efficiency, an optical fiber coil wound with the nonlinear optical fiber, and a wavelength converter equipped with the nonlinear optical fiber. In particular, the no |
| 6259554 |
Optical amplifier repeater system |
July 10, 2001 |
| A repeater station 10 detects whether or not an abnormality exists in each of signal light and monitor light having arrived from a terminal station 1 or a repeater station 20, and controls, according to the result of detection, operations of optical amplifiers 11 and 12 and the monitor |
