| Patent Number |
Title Of Patent |
Date Issued |
| 7543982 |
Sensor and disturbance measurement method using the same |
June 9, 2009 |
| The present invention relates to a sensor or the like having a structure that enables accurate temperature measurement in a wide temperature range including a low-temperature region and is suitable for independently and accurately determining temperature variations and strains appearing |
| 7534031 |
Temperature measuring device and temperature measurement method |
May 19, 2009 |
| The temperature measuring device of the present invention comprises: a light source for outputting light; an optical fiber to which light outputted by the light source is inputted and from which Brillouin scattered light is outputted; a detection unit for detecting a spectrum of the |
| 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 |
| 7382956 |
Optical fibers |
June 3, 2008 |
| The present invention provides an optical fiber enabling signal transmission in a wider band, which is applicable to optical transmission not only in the 1.3 .mu.m wavelength band but also in the 1.55 .mu.m wavelength band, as a transmission medium of a WDM optical communication syst |
| 7359602 |
Optical transmission line constituting method, optical transmission line and optical fiber |
April 15, 2008 |
| The present invention relates to a method of forming a transmission line capable of measuring more precise connection losses at low cost, and so on. At least of first and second optical fibers to be connected as components of the optical transmission line is selected such that, at one |
| 7321709 |
Optical cable |
January 22, 2008 |
| An optical cable according to the present invention relates to an optical cable having a construction to enable reduction of a cable outer diameter, and/or improvement of contained efficiency of coated optical fibers while an increase of transmission loss in each coated optical fiber |
| 7292748 |
Dispersion-compensating system |
November 6, 2007 |
| In the dispersion-compensating system of the present invention, a demultiplexer demultiplexes optical signals in a signal wavelength band of 1520 nm to 1620 nm propagating through a first common transmission line into C band (1520 nm to 1565 nm) and L band (1565 nm to 1620 nm). Then, |
| 7197242 |
Chromatic-dispersion measuring apparatus and method |
March 27, 2007 |
| The present invention provides a chromatic-dispersion measuring apparatus and method that can quickly measure chromatic dispersion in an optical fiber even when the optical fiber is short. Continuous light beams having the wavelengths .lamda..sub.1 and .lamda..sub.2 output from light sou |
| 7194171 |
Dispersion compensating optical fiber, dispersion compensating device, optical transmission line |
March 20, 2007 |
| A dispersion compensating optical fiber comprises a minimum wavelength at which an increase amount of an actual loss value with respect to a theoretical loss value is not less than 10 mdB/km in a use wavelength band and on a long wavelength side of the use wavelength band. The actual |
| 7190868 |
Optical transmission line |
March 13, 2007 |
| Provided is an optical transmission line in which the suppression of SBS and the achievement of other transmission characteristics can compatibly be attained. The optical transmission line is formed by connecting a first optical fiber and a second optical fiber, or by connecting a group |
| 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 |
| 7079769 |
Dispersion-compensating system |
July 18, 2006 |
| In the dispersion-compensating system of the present invention, a demultiplexer demultiplexes optical signals in a signal wavelength band of 1520 nm to 1620 nm propagating through a first common transmission line into C band (1520 nm to 1565 nm) and L band (1565 nm to 1620 nm). Then, |
| 7076140 |
Optical fiber, dispersion compensator, optical transmission line and optical communications syst |
July 11, 2006 |
| The present invention relates to an optical fiber or the like which allows more precise compensation for the chromatic dispersion of a transmission optical fiber over a broad wavelength band. The optical fiber has a chromatic dispersion of -100 ps/nm/km or less in a wavelength band of |
| 7046884 |
Optical fiber, optical fiber tape, optical cable and optical connector with optical fiber |
May 16, 2006 |
| The present invention relates to an optical fiber and the like comprising a structure enabling high-density packaging into an optical cable while making it possible to transmit signals with a high bit rate in both of wavelength bands of 1.3 .mu.m and 1.55 .mu.m. For example, this optical |
| 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 |
| 6868213 |
Optical fiber and production method therefor |
March 15, 2005 |
| The present invention provides an optical fiber which has a hollow portion extending along the axis and which reduces degradation of the optical characteristics, and a production method thereof. An optical fiber includes a hollow core portion, and a cladding portion which surrounds the |
| 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 |
| 6859595 |
Optical fiber and optical transmission system including the same |
February 22, 2005 |
| The present invention relates to an optical fiber which enables favorable optical communications in 1.3-.mu.m and 1.55-.mu.m wavelength bands, and an optical transmission system including the same. The optical fiber according to the present invention has only one zero-dispersion waveleng |
| 6853766 |
Dispersion-compensating module |
February 8, 2005 |
| The present invention relates to a dispersion-compensating module having a structure which compensates for the dispersion of an optical transmission line in a wavelength band of 1.55 .mu.m and adjusts loss fluctuations among wavelengths in the wavelength band of 1.55 .mu.m into an approp |
| 6805497 |
Optical transmission line |
October 19, 2004 |
| An optical transmission line including a portion formed by fusion-splicing optical fibers having structures different from each other; wherein, in the optical fibers having structures different from each other, a first optical fiber 1 has a mode field diameter smaller than that of a seco |
| 6791744 |
Raman amplification optical fiber, optical fiber coil, raman amplifier, and optical communicatio |
September 14, 2004 |
| The present invention relates to a Raman amplification optical fiber and the like comprising a structure which can Raman-amplify signal light including a plurality of wavelength components at a high efficiency and effectively restrain signal waveforms from deteriorating due to influences |
| 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 |
| 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 |
| 6744954 |
Submarine optical cable, optical fiber unit employed in the submarine optical cable, and method |
June 1, 2004 |
| The present invention relates to a wide-band, low-loss, submarine optical cable excellent in productivity, an optical fiber unit employed in the submarine optical cable, and a method of making the optical fiber unit. The optical fiber unit employed in the submarine optical cable comprise |
| 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 |
| 6711331 |
Optical fiber |
March 23, 2004 |
| The present invention relates to an optical fiber having, at least, a structure for effectively restraining microbend loss from increasing. This optical fiber is an optical fiber suitable for a dispersion-flattened fiber, a dispersion-compensating fiber, and the like, and insured its |
| 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 |
| 6701090 |
Wavelength division multiplexing signal number monitoring apparatus and method |
March 2, 2004 |
| Wavelength division multiplexing signal light is fed into an arrayed diffraction grating type optical demultiplexer, demultiplexed signal light components are outputted from a plurality of output ports, whether there is a signal light component or not is detected by each photodiode of a |
| 6684017 |
Optical transmission line and optical transmission system including the same |
January 27, 2004 |
| The present invention relates to an optical transmission line comprising a structure for effectively lowering both of nonlinearity and dispersion slope, and an optical transmission system including the same. The optical transmission line comprises, as a repeatered transmission line dispo |
| 6666591 |
Method for connecting optical fibers |
December 23, 2003 |
| Methods for connecting two optical fibers having different mode field diameters ((MFD) with low connection loss is proposed. One method comprises steps of preparing the third fiber (Fiber 3), a short length and MFD being smaller than that of the first fiber (Fiber 1) and larger than |
| 6661954 |
Optical transmission line including a connected part of optical fibers and connecting method |
December 9, 2003 |
| Provided are an optical transmission line including a connected part of the optical fibers having different refractive index profiles, wherein at least one of the optical fibers has a hollow region, and a method for connecting such optical fibers, wherein connection loss in a connection |
| 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, |
| 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 |
| 6597846 |
Optical fiber |
July 22, 2003 |
| An optical fiber (1) which does not readily suffer influences of side pressures and can realize superior transmission characteristics, having a glass part (2, 3) having a core (2) and at least one cladding (3) and at least one covering layer (4a, 4b) formed around the glass part (2, 3), |
| 6574404 |
Choromatic dispersion compensating module and optical transmission system using the same |
June 3, 2003 |
| The present invention is related to a chromatic dispersion compensating module which realizes signal transmission at a high bit rate by its simple constitution, and an optical transmission system comprising the same. The chromatic dispersion compensating module according to the present |
| 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 |
| 6567597 |
Optical fiber, method of making the same, and optical transmission system including the same |
May 20, 2003 |
| The present invention provides an optical fiber and the like comprising a structure making it possible to realize optical communications with a higher speed and a larger capacity as compared with conventional optical transmission systems. The optical fiber according to the present invent |
| 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 |
| 6532331 |
Single-mode optical fiber floor long haul transmission |
March 11, 2003 |
| The present invention relates to an optical fiber comprising a structure which effectively suppresses the occurrence of nonlinear phenomena without increasing transmission loss such as macrobending loss. The optical fiber according to the present invention comprises, radially in successi |
| 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 |
| 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 |
| 6496631 |
Optical transmission line and optical transmission system including the same |
December 17, 2002 |
| The present invention relates to an optical transmission line comprising a structure for effectively lowering both of nonlinearity and dispersion slope, and an optical transmission system including the same. The optical transmission line comprises, as a repeating transmission line dispos |
| 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 |
| 6473550 |
Optical fiber transmission-line |
October 29, 2002 |
| A dispersion-managed optical fiber transmission-line with which the formation of side bands around the optical signal wavelength can be suppressed even when carrying out high-speed signal transmission. An optical fiber transmission-line 1 constitutes one repeater span installed betwe |
| 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 |
| 6466721 |
Dispersion compensating optical fiber and optical transmission line |
October 15, 2002 |
| The present invention relates to an optical transmission line suitably used for a large-capacity high-speed WDM optical transmission system, and an optical fiber suitably used for such an optical transmission line. The optical transmission line is formed by connecting a single-mode optic |
| 6415089 |
Optical fiber and optical transmission system including the same |
July 2, 2002 |
| The present invention relates to an optical fiber which enables favorable optical communications in 1.3-.mu.m and 1.55-.mu.m wavelength bands, and an optical transmission system including the same. The optical fiber according to the present invention has only one zero-dispersion waveleng |
| 6377740 |
Dispersion Managed optical fiber transmission-line |
April 23, 2002 |
| A dispersion-managed optical fiber transmission-line with which the formation of side bands around the optical signal wavelength can be suppressed even when carrying out high-speed signal transmission. An optical fiber transmission-line 1 constitutes one repeater span installed betwe |
| 6360046 |
Dispersion-shifted optical fiber |
March 19, 2002 |
| The present invention relates to a dispersion-shifted optical fiber which comprises a structure for effectively eliminating the causes of deterioration in characteristics at the making stage thereof and is suitable for wavelength division multiplexing transmission. In the dispersion- |
